Mercury 20 Carb(2CYL)(4-STROKE) (0R235168 & Up) Parts & Diagrams

🔎 Mercury 20 Carb(2CYL)(4-STROKE) Reference Library — Exploded parts diagrams (30 diagrams), specifications, common issues, and maintenance checklist.

The Mercury 20 Carb(2CYL)(4-STROKE) is a 4-Stroke, Inline 2-Cylinder, EFI outboard motor. A popular choice for small fishing boats, inflatable RIBs, and sailboat auxiliaries.

Quick Reference Specifications

Specification	Value
Engine Type	4-Stroke, Inline 2-Cylinder, EFI
Horsepower	20 HP
Displacement	333 cc
Bore x Stroke	61 mm x 57 mm
Spark Plug (Type & Gap)	NGK DCPR6E
Engine Oil Capacity	1.1 L (1.1 quart)
Recommended Engine Oil	SAE 25W-40 Synthetic Blend Mercury FC-W
Gear Case Oil Capacity	237 mL (8 fl oz)
Idle Speed (in gear)	750 ± 50 RPM (in gear)
Full Throttle RPM Range	5400-6200
Fuel	Unleaded Gasoline, 87 Octane min.

Always verify specifications against your owner's manual for your specific serial number range.

Common Issues & Recommended Parts

Below are common maintenance scenarios for the Mercury 20 Carb(2CYL)(4-STROKE):

Water Pump / Overheating: If the tell-tale stream is weak or absent, the water pump impeller likely needs replacement. Inspect annually or every 100 hours. → Recommended: Water Pump Impeller Kit
Engine Oil / Maintenance Light: 4-stroke engines require regular oil and filter changes. Use marine-grade oil rated for your engine. Change every 100 hours or annually. → Recommended: Oil Filter, Engine Oil
Fuel Injector Issues (EFI models): Rough idle or misfires may indicate clogged fuel injectors. Use fuel stabilizer and clean injectors periodically. → Recommended: Fuel Injector, Fuel Filter
Gear Case Oil Leak: Check lower unit seals if gear oil appears milky (water contamination). Replace seals and gaskets during lower unit service. → Recommended: Lower Unit Seal Kit, Drain Plug Gaskets
Anode Corrosion: Inspect sacrificial anodes regularly, especially in saltwater. Replace when 50% depleted to protect against galvanic corrosion. → Recommended: Zinc/Aluminum Anode Kit

Parts Diagrams & OEM Part Numbers

Expand the sections below to view detailed exploded parts diagrams and find the exact OEM replacement components for your Mercury 20 Carb(2CYL)(4-STROKE).

▶Accessories (1 parts)

Ref	OEM Part #	Part Name
-	87-898101A02	SWITCH KIT, Trim

▶Bottom Cowl (37 parts)

Ref	OEM Part #	Part Name
-	37-8M0081456	DECAL SET, Mercury, Lower Cowl Comment: SN# 0R547440 & Up
1	896113T02	BOTTOM COWL
2	10-16830	BOLT
3	12-898101960	WASHER, Rubber
4	23-8537437	MOUNT, Rubber
5	23-853715007	SPACER
6	8M0063135	COWL LATCH ASSEMBLY Comment: SN# 0R403399 & Up
7	10-8230427	BOLT
8	25-162284	GROMMET
9	22-898101961	NIPPLE, Water
10	37-8M0157275	DECAL, Notice-This Side Up Comment: SN# 0R547439 & Below
11	25-898101963	GROMMET
12	37-859278003	DECAL, Throttle Only Comment: Tiller Models
13	25-898101962	GROMMET Comment: Tiller Models
14	25-853709007	GROMMET, Shift Rod
15	898103137	SEAL, Shift Lever Bracket
16	87-898103011	SWITCH, PTT Comment: Power Tilt Models
17	25-898101145	O-RING Comment: Power Tilt Models
18	896630	BRACKET, Switch Comment: Power Tilt Models
19	10-8248324	BOLT Comment: Power Tilt Models
20	895124	PUMP ASSEMBLY, Priming Comment: Tiller Models
21	11-895177	NUT Comment: Tiller Models
22	54-898101964	CLIP Comment: Tiller Models
23	32-851848007	HOSE, Rubber (300 mm) Comment: Tiller Models
24	25-16226	GROMMET Comment: Electric Remote Models
25	37-896854007	DECAL, Oil Pressure
26	25-853709008	GROMMET, Battery Cable
27	878311	CAP
28	22-8M0182334	CONNECTOR, Fuel - Brass
29	54-8M0129429	CLIP
30	32-898101157	HOSE, Rubber (400 mm)
31	10-8248324	BOLT
32	37-859278004	DECAL, Start Comment: Electric Tiller Models
33	25-162262	GROMMET
34	32-895108006	SLEEVE, Protective
35	853817003	BRACKET, Neutral Switch
36	10-8248324	BOLT

▶Camshaft and Oil Pump (18 parts)

Ref	OEM Part #	Part Name
-	27-803663A08	GASKET SET, Powerhead
1	402-898101965	CAMSHAFT ASSEMBLY
2	28-95229	KEY
3	26-825455001	SEAL, Oil
4	43-834973001	GEAR, Driven, Camshaft Pulley
5	10-803858001	BOLT
6	12-895118	WASHER
7	57-895120002	BELT, Timing
8	11-855679004	NUT
9	13-823032004	LOCKWASHER
10	895119003	GUIDE, Belt
11	834955T04	PULLEY, Drive, Timing Pulley
12	834967005	PUMP, Oil
13	25-857096001	O-RING
14	25-857093001	O-RING
15	25-857094002	O-RING
16	25-857094001	O-RING
17	10-850879001	BOLT

▶Carburetor (42 parts)

Ref	OEM Part #	Part Name
-	8M0044577	KIT, Carb Repair
1	1300-8M0129554	CARBURETOR ASSEMBLY Comment: 20-Remote Models
2	855540004	COVER
3	10-898103135	SCREW
4	27-855541005	GASKET
5	24-16264003	SPRING, (14 mm)
6	10-803509022	SCREW, Stop
7	10-803509A17	SCREW AND SPRING KIT, (18 mm)
8	24-16264003	SPRING, (14 mm)
9	52,803689009	JET, Pilot Comment: 20 Horsepower
10	8M0126021	MAIN NOZZLE Comment: 20-Remote Models
11	809570002	FLOAT VALVE
12	25-825057004	O-RING
13	19-802702001	PLUG Comment: 20 Horsepower
14	121,802701011	JET, Main Comment: 20 Horsepower
15	99,802701010	JET, Main Comment: 15 Horsepower
16	19-802702002	PLUG Comment: 15 Horsepower
17	162532	FLOAT
18	17-162561	PIN, Float Arm
19	10-855544013	SCREW
20	802690011	FLOAT BOWL
21	27-802699005	GASKET
22	35-898101988	FILTER, Fuel
23	10-809578006	SCREW, Drain
24	27-802691001	GASKET
25	21-851812008	CHECK VALVE
26	19-895114	CAP
27	895115	BOOT, Rubber
28	53-8M0123420	RING, Retaining
29	10-898103135	SCREW
30	853830005	PLUNGER, Complete
31	24-895116002	SPRING, Coil
32	895117003	COVER Comment: Remote Models
33	895117002	COVER Comment: Tiller Models
34	10-855544018	SCREW
35	10-803509013	SCREW, Drain
36	27-855567002	GASKET
37	25-898103224	O-RING
38	855562003	LINK ROD, Choke Comment: Tiller Models
39	855561010	SNAP, Link Rod Comment: Tiller Models
40	8M0155127	ROD, Choke Comment: Tiller Models
41	23-851858005	BUSHING Comment: Tiller Models

▶Clamp Brackets, Manual Tilt (50 parts)

Ref	OEM Part #	Part Name
1	3418-879147T73	CLAMP BRACKET, Starboard
2	3418-879147T74	CLAMP BRACKET, Port
3	10-8M0054653	THUMB SCREW ASSEMBLY, 14 MM Thread Size
4	12-95379	PAD
5	11-85372214	CAP NUT
6	898101191	TILT TUBE ASSEMBLY
7	895163002	PLATE
8	23-8537435	BUSHING
9	11-853722029	NUT, Nylon
10	898103101	THRUST ROD ASSEMBLY
11	24-815093003	SPRING
12	11-400212	NUT
13	12-16826	WASHER
14	898101938	DISTANCE PIECE
15	37-823701004	DECAL, Co-Pilot
16	898101152	SHAFT, Reverse Lock
17	53-953181	E RING
18	879147T77	REVERSE LOCK
19	17-170331	PIN, Spring
20	24-898103111	SPRING, Reverse Lock
21	24-953832	SPRING
22	853774	STOP
23	23-163364	BUSHING
24	17-898103104	PIN, Spring
25	898103103	STOPPER, Tilt
26	8M0157137	SET PLATE
27	10-8M0106739	BOLT
28	815082002	HANDLE, Carrying
29	898103105	STOPPER, Tilt
30	10-898101014	SCREW
31	12-8M0135942	WASHER
32	13-8537232	WAVE WASHER
33	10-167051	BOLT, (M6 x 20)
34	97-823913Q	ANODE
35	898103108	ARM, Reverse Lock
36	898103112	LINK, Reverse Lock
37	8M0169412	SNAP, Link Rod
38	23-898103109	COLLAR
39	24-898103110	SPRING, Reverse Lock Lever
40	879147T76	LEVER, Reverse Lock
41	898103106	GRIP, Reverse Lock Lever
42	8M0051399	BUTTON
43	10-803790001	BOLT, Shoulder
44	12-16192	WASHER
45	23-898103107	BUSHING
46	12-953925	WASHER
47	12-953921	WASHER, Stainless Steel
48	10-8M0094877	BOLT
49	12-16192	WASHER
50	11-95374	NUT, Nylon

▶Clamp Brackets, Power Tilt (44 parts)

Ref	OEM Part #	Part Name
1	3406-815030T05	CLAMP BRACKET, Starboard
2	3406-815031T03	CLAMP BRACKET, Port
3	898101191	TILT TUBE ASSEMBLY
4	895163002	PLATE
5	11-85372214	CAP NUT
6	17-815051001	PIN, Trim Lock
7	12-8M0135942	WASHER
8	11-95374001	NUT, Nylon
9	10-8230427	BOLT, (M6 x 12)
10	10-879194253	BOLT
11	12-95375	WASHER
12	23-16176008	BUSHING
13	17-851874005	PIN, Cylinder-Lower
14	97-875208	ANODE
15	10-8248324	SCREW, (M6 x 16)
16	84-898101089	WIRE, Ground
17	8M0236386	POWER TILT ASSEMBLY
18	23-16176009	BUSHING
19	3407-879147T82	SWIVEL BRACKET
20	22-824969	FITTING, Grease
21	8M0120641	STOPPER, Tilt
22	16208	GRIP
23	23-95286027	COLLAR
24	24-95383010	SPRING, Tilt Stopper
25	17-8M0091498	PIN, Cylinder
26	10-879194248	BOLT
27	12-898101937	WASHER
28	12-879194340	WASHER
29	17-95218017	PIN, Spring
30	69356	TIE STRAP, (8.18 Inches)
31	12-95379	PAD
32	10-162635	CLAMP SCREW
33	12-95375001	WASHER
34	11-853722029	NUT, Nylon
35	10-8M0204707	BOLT Comment: Tiller Models
36	12-953921	WASHER, Stainless Steel Comment: Tiller Models
37	23-855545003	COLLAR Comment: Tiller Models
38	12-898101937	WASHER Comment: Tiller Models
39	896297001	STRAP ASSEMBLY Comment: Tiller Models
40	10-898103117	BOLT Comment: Tiller Models
41	815082002	HANDLE, Carrying
42	10-8M0094877	BOLT
43	12-16192	WASHER
44	11-95374	NUT, Nylon

▶Crankshaft, Pistons and Connecting Rods (15 parts)

Ref	OEM Part #	Part Name
-	27-803663A08	GASKET SET, Powerhead
1	401-879147T80	CRANKSHAFT ASSEMBLY
2	23-898101T07	BEARING, Thrust - Blue
3	26-855681005	SEAL, Oil, Lower
4	26-898103114	SEAL, Oil, Upper
5	28-825666001	KEY, Magneto
6	28-95229	KEY, Drive Pulley
7	713-898103A08	PISTON ASSEMBLY
8	39-898103T35	RING KIT, Piston
9	NSS	NOT SOLD SEPARATE, Piston Ring-Second
10	NSS	NOT SOLD SEPARATE, Piston Ring-Oil
11	41-898103113	PIN, Piston
12	53-160573	E RING
13	600-8M0124940	CONNECTING ROD ASSEMBLY
14	10-8035092	BOLT

▶Cylinder Block (46 parts)

Ref	OEM Part #	Part Name
-	27-803663A08	GASKET SET, Powerhead
1	803-879147T59	CYLINDER BLOCK ASSEMBLY
2	10-855677004	BOLT
3	22-822644001	NIPPLE
4	17-16119	PIN, Dowel
5	10-855677005	BOLT
6	10-166985	BOLT
7	12-16826	WASHER
8	8M0093610	INSERT, Water Jacket Starboard (Black)
9	8M0093611	INSERT, Water Jacket Port (Black)
10	898101968	BRACKET
11	10-879194268	BOLT
12	54-898101949	CLAMP
13	23-95286029	COLLAR, (9.5 mm) Stainless Steel
14	8537052	CAP
15	27-8M0214960	GASKET, Thermostat Cap
16	8M0119207	THERMOSTAT, 60 Degrees
17	855550003	LIFTING EYE
18	10-879194293	BOLT
19	12-879194342	WASHER
20	803511001	CAP
21	10-895136003	SCREW
22	54-8M0130961	CLAMP
23	27-803508020	GASKET, Breather Chamber Cover
24	898101966	DIPSTICK
25	32-851848032	HOSE, Rubber (110 mm)
26	54-95395	CLIP, Stainless Steel
27	834954004	COVER , Plunger
28	898101142	PLUNGER
29	27-835427T05	GASKET, Oil Pan
30	898101967	GUIDE PLATE
31	10-8230427	BOLT, (M6 x 12)
32	10-898103228	BOLT, (M8 x 35)
33	35-895152003	STRAINER, Oil
34	54-816311T	TIE STRAP, (8.00 Inches)
35	32-8M0206070	HOSE, Rubber (150 mm)
36	35-8M0162831	FILTER ASSEMBLY, Oil
37	97-895151001	ANODE
38	27-895150001	GASKET, Anode Cap
39	10-898101953	BOLT
40	97-823912	ANODE
41	10-16832	BOLT, (M6 x 16)
42	898103159	COVER, Exhaust
43	27-803663016	GASKET, Exhaust Cover
44	10-825009026	BOLT
45	32-851848003	HOSE, (330 mm), Tell-Tale

▶Cylinder Head (15 parts)

Ref	OEM Part #	Part Name
-	27-803663A08	GASKET SET, Powerhead
1	879147T57	CYLINDER HEAD ASSEMBLY
2	27-812939T25	GASKET, Cylinder Head
3	17-16119	PIN, Dowel
4	10-855677002	BOLT
5	10-823042054	BOLT
6	10-898101009	SCREW
7	12-16826	WASHER
8	33-8M0204682	SPARK PLUG, NGK#DCPR6E
9	879147T58	COVER, Cylinder Head, Cylinder Head
10	27-812939T26	GASKET, Rubber, Cylinder Head Cover
11	10-16830A1	SCREW KIT
12	36-8M0135589	CAP ASSEMBLY, Oil Filler
13	25-803513007	O-RING
14	NSS	NOT SOLD SEPARATE, Decal-Engine Oil

▶Driveshaft Housing (36 parts)

Ref	OEM Part #	Part Name
1	1590-803725T05	HOUSING ASSEMBLY, Driveshaft - Long
2	19-803593	PLUG Comment: As needed
3	852432004	SEAL, Rubber
4	898101969	MOUNT, Upper-Rubber
5	853772004	LOCK PLATE
6	10-879194273	BOLT
7	26-8036675	SEAL, Oil
8	17-16119	PIN, Dowel
9	853706004	COVER, Idle Exhaust Port
10	25-898101972	GROMMET, Idle Exhaust Cover
11	10-823042077	BOLT
12	895163001	PLATE, Idle Exhaust Cover
13	10-803698002	BOLT
14	27-898101970	GASKET, Idle Exhaust Cover
15	8M0111615	BOLT
16	12-895146	WASHER
17	25-804899003	GROMMET
18	853794002	CAM ROD Comment: Long/X-Long
19	10-898101953	BOLT Comment: Long/X-Long
20	26-16168003	SEAL, Rubber, Upper
21	32-803755013	TUBE, Water Comment: X-Long
22	803758001	GUIDE, Rubber
23	852432003	SEAL, Rubber
24	850863T02	COVER, Driveshaft Housing-Starboard
25	850862T02	COVER, Driveshaft Housing-Port
26	10-16257004	SCREW, Tapping
27	853783T10	HOUSING, Extension Comment: X-Long
28	10-8230427	BOLT Comment: X-Long
29	16121001	STOPPER Comment: X-Long
30	23-811314006	BUSHING, Driveshaft Comment: X-Long
31	12-8M0135942	WASHER Comment: X-Long
32	11-879194337	NUT Comment: X-Long
33	16-898101943	STUD Comment: X-Long
34	810753005	LOCK PLATE Comment: X-Long
35	25-881305004	GROMMET Comment: X-Long
36	10-823042067	SCREW Comment: X-Long

▶Electrical Components, Rectifier (28 parts)

Ref	OEM Part #	Part Name
-	895299A03	CHARGING KIT, Battery
1	84-898101979	WIRE ASSEMBLY, Fuse
2	88-853814002	FUSE, 20 Ampere
3	879147T62	RECTIFIER
4	10-823042	BOLT
5	54-8M0130961	CLAMP
6	898101976	BRACKET, Fuse Holder
7	54-898101949	CLAMP
8	898103175	BAND MOUNT
9	69356	TIE STRAP, (8.18 Inches)
10	84-892778A01	CABLE ASSEMBLY, Fuse
11	88-853814002	FUSE, 20 Ampere
12	898101994	BRACKET, Solenoid Comment: Power Tilt
13	10-16705	BOLT Comment: Power Tilt
14	12-953921	WASHER, Stainless Steel Comment: Power Tilt
15	898101158	MOUNT, Rubber Comment: Power Tilt
16	23-898101942	COLLAR Comment: Power Tilt
17	54-898101949	CLAMP Comment: Power Tilt
18	87-851839T02	SWITCH ASSEMBLY, Solenoid Comment: Power Tilt
19	84-8537408	CABLE, Black Comment: Power Tilt
20	85-853816004	BOOT, Red Comment: Power Tilt
21	10-167051	BOLT, (M6 x 20) Comment: Power Tilt
22	84-898101996	HARNESS ASSEMBLY Comment: Power Tilt
23	898101999	BRACKET Comment: Power Tilt
24	10-8248324	BOLT Comment: Power Tilt
25	84-898101995	HARNESS ASSEMBLY, Extension Comment: Power Tilt
26	84-898103177	HARNESS ASSEMBLY, Extension
27	8M0099462	RUBBER MOUNT ASSEMBLY

▶Electrical Components, Starter Motor and Solenoids (36 parts)

Ref	OEM Part #	Part Name
-	50-8M0071380	START KIT, Electric
1	10-823042073	SCREW
2	54-803563003	CLAMP Comment: Remote Models
3	10-8230427	BOLT Comment: Remote Models
4	879147T61	BRACKET, Starter Solenoid
5	10-8230427	BOLT, (M6 x 12)
6	89-853809002	SOLENOID, Starter
7	10-823042059	BOLT
8	32-895108008	SLEEVE, Protective
9	853741001	CAP, Terminal
10	50-8M0188334	STARTER MOTOR ASSEMBLY
11	10-8230427	BOLT, (M6 x 12)
12	84-853740016	CABLE, Starter
13	85-853816002	BOOT, Terminal
14	853740018	SLEEVE
15	85-853816003	BOOT, Red, Terminal
16	851837	MOUNT, Rubber, Starter Motor
17	898101973	BRACKET, Starter Motor
18	10-8M0106739	BOLT
19	32-895108007	SLEEVE, Protective
20	54-898101949	CLAMP
21	895127T01	BRACKET ASSEMBLY Comment: Remote Models
22	853725001	LEVER, Choke Comment: Remote Models
23	23-853743009	BUSHING Comment: Remote Models
24	12-823032005	WASHER Comment: Remote Models
25	10-898101957	SCREW Comment: Remote Models
26	10-823042067	SCREW Comment: Remote Models
27	898101989	LINK ROD Comment: Remote Models
28	853748001	SNAP, Link Rod Comment: Remote Models
29	898101986	SOLENOID, Choke Comment: Remote Models
30	853830	PLUNGER Comment: Remote Models
31	17-952189	PIN, Dowel Comment: Remote Models
32	898101987	HOOK, Choke Solenoid Comment: Remote Models
33	84-879147T63	CABLE ASSEMBLY, Battery
34	87-8M0127937	SWITCH ASSEMBLY, Neutral Comment: Tiller Models
35	87-853820A02	SWITCH ASSEMBLY, Start Comment: Tiller Models

▶Flywheel/Ignition Coil (41 parts)

Ref	OEM Part #	Part Name
1	200-879147T68	FLYWHEEL
2	11-851832001	NUT, Gold
3	12-853991002	WASHER
4	879147T69	ALTERNATOR
5	10-853536002	SCREW
6	12-895106003	WASHER
7	54-953951	CLAMP
8	10-162452	SCREW
9	19-853994	PLUG, Terminal Comment: Electric Remote
10	879147T70	BRACKET, Coil
11	10-898101992	BOLT
12	17-16119	PIN, Dowel
13	898101993	COIL, Pulser
14	10-82304226	BOLT
15	54-803563005	CLAMP
16	10-8230427	BOLT, (M6 x 12)
17	804057001	PILOT LAMP
18	8M0070131	HOLDER, Cable Terminal
19	10-8248324	BOLT, Upper
20	23-895126	COLLAR, (6 mm)
21	10-8230427	BOLT, Lower
22	37-898101977	DECAL, Wiring Diagram Comment: Remote Models
23	8M0070127	COVER
24	84-898101997	HARNESS ASSEMBLY, CD
25	25-8M0106928	GROMMET
26	54-953951	CLAMP
27	10-8230427	BOLT, (M6 x 12)
28	87-8M0163139	SWITCH
29	835401T06	CD UNIT
30	10-803509014	BOLT
31	12-953921	WASHER, Stainless Steel
32	898101998	BRACKET, CD Unit
33	54-898101949	CLAMP
34	10-16705	BOLT
35	12-953921	WASHER, Stainless Steel
36	898101158	MOUNT, Rubber
37	23-898101942	COLLAR
38	339-879147T71	COIL, Ignition
39	85-898101141	BOOT
40	10-823042	BOLT
41	37-892904011	DECAL, Start in Gear Comment: Remote Models

▶Gear Housing, Driveshaft (49 parts)

Ref	OEM Part #	Part Name
-	46-8M0122064	PUMP KIT, Water - Complete
1	1668-8M0070875	GEAR HOUSING, Basic
2	31-898101991	BEARING, Needle
3	22-8M0229353	PLUG
4	22-8M0229353	PLUG
5	27-95220	GASKET
6	803730002	STRAINER, Water
7	10-17635	SCREW
8	11-85372210	NUT
9	16133	STRAINER, Water
10	10-898101959	SCREW
11	853762T01	TRIM TAB
12	10-167051	BOLT, (M6 x 20)
13	11-85372211	NUT
14	43-879147T91	GEAR, Pinion
15	45-8M0140447	DRIVESHAFT, X-Long
16	28-8M0173418	KEY
17	30-879147T89	BEARING, Ball
18	15-813276005	SHIM, (0.5)
19	26-803752	SEAL, Oil
20	25-8537096	O-RING
21	46-803750A04	BASE ASSEMBLY, Water Pump
22	803753	GUIDE PLATE
23	47-8M0214944	IMPELLER
24	46-803750A05	HOUSING ASSEMBLY, Upper Water Pump
25	803751	LINER, Water Pump
26	26-8036674	SEAL
27	10-879194269	BOLT
28	25-161772	O-RING
29	25-8537096	O-RING
30	23-803761	BUSHING
31	10-898103153	BOLT
32	803762	CLAMP
33	8M0070770	RETAINER
34	17-16175	PIN
35	24-898103158	SPRING
36	8M0070771	RETAINER
37	803760018	CAM ROD, X-Long
38	8M0172382	CLUTCH CAM
39	17-16179	PIN
40	898103188	SHIFT ROD Comment: Remote Control
41	898103155	JOINT, Reverse Lock Link
42	10-162452	SCREW
43	11-400212	NUT, (M6) Stainless Steel
44	810753004	STOPPER
45	10-855544018	SCREW
46	11-16081	NUT, Stainless Steel
47	803767002	COUPLER, Shift Shaft
48	27-8M0075040	GASKET, Guide Plate Comment: SN# OR501623 & Up

▶Gear Housing, Propeller Shaft (29 parts)

Ref	OEM Part #	Part Name
-	27-95220A08	GASKET SET, Lower Unit
1	1668-8M0070875	GEAR HOUSING, Basic
2	30-879147T60	BEARING, Ball
3	43-8M0190555	GEAR, Forward
4	898103150	PUSH ROD
5	30-161322	BALL, Steel
6	853764003	RETAINER
7	24-803746	SPRING
8	52-879147T93	CLUTCH
9	17-160851	PIN
10	24-176672	SPRING
11	44-8M0088568	PROPELLER SHAFT
12	12-803742	WASHER
13	43-879147T92	GEAR, Reverse
14	8M0070878	CARRIER ASSEMBLY, Bearing
15	25-8M0087846	O-RING
16	30-879147T60	BEARING, Ball
17	31-803734	BEARING, Needle
18	26-161622	SEAL, Oil
19	10-8M0075053	BOLT
20	8M0143215	THRUST HOLDER
21	12-161402	WASHER
22	11-161471	PROP NUT
23	18-8150264	COTTER PIN
24	48-897754A11	BLACK MAX PROPELLER, 3 Blade (9.25 Diameter/11.5 Pitch)
25	19-898103165	PLUG, Pipe, Sub Water
26	16-898101943	STUD
27	12-8M0135942	WASHER
28	11-879194337	NUT

▶Intake Manifold and Fuel Pump (29 parts)

Ref	OEM Part #	Part Name
-	27-803663A08	GASKET SET, Powerhead
1	879147T64	MANIFOLD, Intake
2	27-898101980	GASKET
3	17-16119	PIN, Dowel
4	10-16125	BOLT
5	12-16826	WASHER Comment: Handle Models
6	54-953951	CLAMP
7	10-8230427	BOLT, (M6 x 12)
8	27-898101981	GASKET, Carburetor
9	8M0084959	THROTTLE LIMITER Comment: 10 HP
10	32-898103186	HOSE, Breather-Carburetor
11	32-898101985	HOSE, Rubber (120 mm), Breather
12	54-952245	CLAMP
13	879147T65	SILENCER, Intake
14	25-898101984	O-RING
15	10-855809001	BOLT
16	23-898101941	COLLAR Comment: Tiller Models
17	12-16826	WASHER
18	23-952868	COLLAR Comment: Remote Models
19	32-851848011	TUBING, (300 mm)
20	54-8M0129429	CLIP
21	803529T04	PUMP ASSEMBLY, Fuel
22	25-16109003	O-RING
23	10-823042	BOLT
24	32-851848006	HOSE, (150 mm)
25	35-8M0157133	FILTER, Fuel
26	22-8M0073649	FITTING, Tee
27	32-898103187	HOSE, Breather
28	32-8M0057118	HOSE, (200mm)

▶Intake/Exhaust Valves (17 parts)

Ref	OEM Part #	Part Name
-	8M0145938	SHORT BLOCK
1	879147T87	VALVE, Intake
2	879147T88	VALVE, Exhaust
3	26-822647001	SEAL, Intake - Black
4	8M0158660	SEAT
5	24-898101214	SPRING, Valve
6	898103147	RETAINER
7	28-898103148	COTTER
8	8M0123419	ROCKER ARM
9	10-825046001	SCREW, Adjusting
10	11-826150001	NUT, Adjusting
11	12-895118001	WASHER
12	24-825452002	SPRING
13	825451001	COLLAR
14	24-825453001	SPRING
15	898103149	SHAFT, Rocker Arm
16	26-822647002	SEAL, Exhaust - Green

▶Power Tilt (28 parts)

Ref	OEM Part #	Part Name
-	8M0236386	POWER TILT ASSEMBLY
1	896299A01	CAP ASSEMBLY
2	25-1613110	O-RING
3	813442A05	MANUAL VALVE ASSEMBLY
4	25-812641003	O-RING
5	25-16131013	O-RING
6	53-804027002	C RING
7	26-898101245	SEAL
8	896301A01	VALVE ASSEMBLY
9	25-803513009	O-RING
10	25-1613110	O-RING
11	827674002	PUMP
12	827672A06	RELIEF VALVE ASSEMBLY
13	25-16131013	O-RING
14	10-8518664	BOLT
15	10-8518663	BOLT
16	35-851876	FILTER
17	851877001	COUPLING
18	25-16131011	O-RING
19	896302T02	BRACKET ASSEMBLY
20	26-822891001	SEAL, Oil
21	25-16131012	O-RING
22	69356	TIE STRAP, (8.18 Inches)
23	10-895143004	SCREW
24	891753T02	ARMATURE ASSEMBLY
25	896303T	HOUSING
26	10-879194330	SCREW
27	10-851866010	BOLT

▶Powerhead Gasket Set Components (1 parts)

Ref	OEM Part #	Part Name
-	26-898103114	SEAL, Oil, Crankshaft-Upper

▶Recoil Starter (36 parts)

Ref	OEM Part #	Part Name
-	37-898103193	DECAL, Interferance
1	8M0126983	STARTER ASSEMBLY, Recoil
2	8M0138744	HOUSING, Starter
3	24-812645008	SPRING, Starter Lock
4	8M0136189	HANDLE, Starter
5	853755002	CAP, Starter Handle
6	804031002	LOCK, Starter
7	50-8M0110715	ROPE, Starter
8	24-804024008	SPRING, Starter
9	898103118	REEL
10	10-898103121	SCREW, Tapping
11	23-898103120	BUSHING
12	24-8M0126988	SPRING, Friction
13	812638002	PLATE, Friction
14	10-8M0126987	BOLT, Starter Shaft
15	24-812634004	SPRING, Return
16	898101148	GUIDE, Ratchet
17	898103119	RATCHET
18	898103123	SEAL, Starter
19	12-953921	WASHER, Stainless Steel
20	23-8035731	COLLAR
21	54-8M0130961	CLAMP
22	10-879194264	BOLT
23	11-856949002	NUT
24	898103164	WIRE , Starter Lock
25	23-895162001	COLLAR, Steel
26	25-881305006	GROMMET, Rubber
27	895133T01	COVER, Belt
28	NSS	NOT SOLD SEPARATE, Decal-Spark Plug
29	10-16705	BOLT
30	23-898101941	COLLAR
31	10-16830	BOLT
32	12-953921	WASHER, Stainless Steel
33	37-8M0056964	DECAL, Caution, Decal-Caution
34	24-898101185	SPRING, Starter Lock Cam
35	10-16705	BOLT

▶Service/Support Material (1 parts)

Ref	OEM Part #	Part Name
-	NSS	NOT SOLD SEPARATE, DECAL, EPA (2009 & Up) Comment: Contact Mercury Marine Warranty Administration for Replacement (Service Bulletin 2009-18)

▶Shift , Manual (28 parts)

Ref	OEM Part #	Part Name
1	879147T86	COVER, Shift Lever Bracket
2	10-898101947	BOLT, With Washer
3	898103145	ROD, Throttle
4	10-8M0102279	BOLT
5	23-895126004	COLLAR, Stainless Steel (6.3 mm)
6	898103144	OPENER, Throttle
7	12-953921	WASHER, Stainless Steel
8	895101401	DRUM, Throttle
9	879147T85	BRACKET, Shift Lever
10	10-898101953	BOLT
11	898103139	KNOB
12	25-853709007	GROMMET
13	25-898103140	GROMMET
14	895161	GEAR, Driven
15	898103141	GEAR PLATE
16	10-823042	BOLT
17	898103142	GEAR , Drive
18	23-895162001	COLLAR, Steel
19	12-16826	WASHER
20	11-8537227	NUT, Nylon
21	803756004	SHIFT DETENT
22	803756005	STOPPER
23	10-898101951	BOLT
24	898103136	SHIFT SHAFT ASSEMBLY
25	17-16085003	PIN
26	24-813028003	SPRING
27	895157002	HOLDER
28	10-8248324	BOLT

▶Shift, Electric (43 parts)

Ref	OEM Part #	Part Name
1	851865T04	SHIFT SHAFT ASSEMBLY
2	803756004	SHIFT DETENT
3	803756003	CLAMP, Shift Detent
4	10-898101951	BOLT
5	898103127	SHIFT ARM
6	12-898101218	WASHER, Plastic
7	54-8M0021224	CLIP, Bow-Tie
8	8M0079131	SOCKET
9	11-16081	NUT, Stainless Steel
10	898103128	ROD, Shift Lever
11	163332	SNAP, Link Rod
12	898103129	LEVER , Shift
13	10-8M0204707	BOLT
14	12-953921	WASHER, Stainless Steel
15	23-8M0021168	COLLAR
16	23-898103168	SPACER
17	18-8150261	COTTER PIN
18	898103131	LEVER, Throttle
19	10-8M0101655	BOLT
20	12-953921	WASHER, Stainless Steel
21	23-8M0030357	COLLAR
22	16333	ROD, Snap
23	898103130	ROD, Throttle
24	898103134	STOPPER, Throttle Lever
25	10-8248324	BOLT
26	898101940	COVER
27	10-898101947	BOLT, With Washer
28	898103125	BRACKET
29	25-898103126	GROMMET
30	10-898101953	BOLT
31	898103138	STEERING BRACKET, Steering Hook
32	10-879194258	SCREW
33	12-879194340	WASHER
34	84-803884A02	HARNESS ASSEMBLY
35	54-803563003	CLAMP
36	10-8230427	BOLT
37	853824A04	DRAG LINK ASSEMBLY
38	23-853826001	SPACER
39	10-851866007	BOLT
40	11-161473	NUT, Nylon
41	12-9539210	WASHER
42	853825	CAP
43	8M0087580	BRACKET, Throttle Stop Comment: 10 HP

▶Starter Motor Components (14 parts)

Ref	OEM Part #	Part Name
1	50-8M0188334	STARTER MOTOR ASSEMBLY
2	8M0188338	PINION
3	12-953926	WASHER
4	8M0135544	HOLDER, Brush
5	10-16821	SCREW
6	23-8M0135546	BUSHING
7	10-162632	BOLT
8	13-898101181	LOCKWASHER
9	12-898101215	WASHER
10	25-161784	O-RING
11	23-8M0135545	BUSHING
12	12-16826	WASHER, Stainless Steel
13	13-400256	LOCKWASHER, (M6)
14	11-853722026	NUT

▶Steering Arm/Swivel Bracket, Manual Tilt (30 parts)

Ref	OEM Part #	Part Name
1	853770T08	ARM, Steering
2	16-895166001	STUD BOLT
3	12-879194340	WASHER
4	11-85372212	NUT, Nylon
5	851869003	BRACKET, Starboard, Mount
6	898101944	MOUNT, Rubber, Lower
7	898101945	DAMPER, Lower
8	851869004	BRACKET, Port, Mount
9	10-823042059	BOLT
10	84-898101089	WIRE, Ground
11	12-8M0135942	WASHER
12	11-879194337	NUT
13	22-824969	FITTING, Grease
14	10-167051	BOLT, (M6 x 20)
15	97-823913Q	ANODE
16	10-19943100	SCREW, (M8 x 100)
17	10-898101950	BOLT
18	803774003	THRUST PLATE
19	23-16336008	BUSHING
20	3406-879147T75	SWIVEL BRACKET ASSEMBLY
21	10-8230427	BOLT, (M6 x 12)
22	25-16109003	O-RING
23	11-95374001	NUT, Nylon
24	895171	HANDLE
25	12-895146001	WASHER
26	12-895146002	WASHER
27	895172001	PLATE, Co-Pilot
28	8M0145395	DISC
29	10-8248324	BOLT
30	10-895140002	BOLT

▶Tiller Handle (45 parts)

Ref	OEM Part #	Part Name
-	87-898101A02	SWITCH KIT, Trim
1	8M0051374	TILLER HANDLE
2	8M0051375	PLUG, Cap
3	8M0051380	BRACKET, Aluminum, Throttle Shaft
4	10-8M0051381	SCREW, Stainless Steel
5	10-8M0204707	SCREW, (M6 x 25)
6	8M0051382	CLAMP, Friction - Throttle
7	24-8M0051384	SPRING, Stainless Steel
8	8M0051383	NUT, Adjusting
9	8M0221732	GRIP, Rubber, Outer
10	8M0051405	SWITCH ASSEMBLY, Stop
11	8M0051377	GRIP, Inner
12	37-896853008	DECAL, Tiller Handle Shift-Rabbit
13	8M0051379	SHAFT, Throttle
14	8M0051388	COVER
15	10-16257003	SCREW, Tapping - Stainless Steel
16	12-8M0108373	WASHER, Stainless Steel
17	8M0051386	PULLEY
18	8M0051387	HOUSING
19	8M0051391	CABLE, Throttle
20	8M0051392	HANDLE, Carrying
21	10-8M0058362	BOLT, Steel
22	12-879194340	WASHER
23	87-892395A01	SWITCH ASSEMBLY, Stop
24	8M0032846	RETAINER, Brass
25	15920Q54	LANYARD ASSEMBLY
26	8M0051393	COVER
27	10-8M0051395	SCREW, Stainless Steel (M4 x 25)
28	10-8M0136037	SCREW, Stainless Steel (M4 x 16)
29	8M0051396	LEVER, Tiller Lock - Stainless Steel
30	8M0051399	BUTTON
31	8M0051397	COLLAR, Stainless Steel
32	24-8M0051398	SPRING, Stainless Steel
33	12-8M0051404	WASHER, Rubber
34	23-8M0051403	BUSHING, Plastic
35	8M0051400	COVER
36	10-823042	BOLT
37	10-8M0051402	BOLT
38	37-892904006	DECAL, Tiller Lock Release
39	8M0151054	PLATE Comment: Power Tilt
40	8M0162938	SCREW Comment: Power Tilt
41	54-17169	CLAMP Comment: Power Tilt
42	10-8M0051381	SCREW Comment: Power Tilt
43	8M0151038	HOUSING, Switch Comment: Power Tilt
44	8M0162937	SWITCH, Power Tilt

▶Tiller Handle Conversion Kit, Electric - 8M0051059 (87 parts)

Ref	OEM Part #	Part Name
-	8M0051059	CONVERSION KIT, Tiller Handle, (Electric Remote Control to Electric Handle)
1	NSS	NOT SOLD SEPARATE, TILLER HANDLE ASSEMBLY
2	8M0051374	TILLER HANDLE
3	8M0051375	PLUG, Cap
4	8M0051377	GRIP
5	8M0051405	SWITCH ASSEMBLY, Stop
6	8M0221732	GRIP, Rubber
7	37-896853008	DECAL, Tiller Handle Shift-Rabbit
8	8M0051379	SHAFT, Throttle
9	10-878608	SCREW, (#10-16 x .500)
10	12-8M0108373	WASHER, Stainless Steel
11	8M0051388	COVER
12	8M0051386	PULLEY
13	8M0051387	HOUSING
14	8M0051391	CABLE, Throttle
15	54-22740	CLIP
16	10-8M0051381	SCREW
17	8M0051380	BRACKET, Aluminum
18	10-8M0051381	SCREW
19	10-8M0204707	BOLT
20	8M0051382	CLAMP, Friction - Throttle
21	24-8M0051384	SPRING, Stainless Steel
22	8M0051383	NUT
23	8M0051392	HANDLE, Carrying
24	8M0051400	COVER
25	10-823042	BOLT, Stainless Steel
26	10-8M0051402	BOLT, Stainless Steel
27	37-892904006	DECAL, Tiller Lock Release
28	87-892395A01	SWITCH ASSEMBLY, Stop
29	8M0032846	RETAINER, Brass
30	23-8M0051403	BUSHING, Plastic
31	8M0051393	COVER
32	10-8M0204707	BOLT
33	10-8M0136037	SCREW, Stainless Steel (M4 x 16)
34	8M0051396	LEVER, Tiller Lock - Stainless Steel
35	8M0051383	NUT
36	8M0051397	COLLAR, Stainless Steel
37	24-8M0051398	SPRING, Stainless Steel
38	12-8M0051404	WASHER, Rubber
39	10-8M0058362	BOLT, Steel
40	12-879194340	WASHER, Stainless Steel
41	NSS	NOT SOLD SEPARATE, GEAR ASSEMBLY, Throttle Only
42	10-8M0102279	BOLT
43	23-895126004	COLLAR, Stainless Steel (6.3 mm)
44	898103144	OPENER, Throttle
45	12-953921	WASHER, Stainless Steel
46	895101401	DRUM, Throttle
47	879147T85	BRACKET, Shift Lever
48	898103139	KNOB
49	25-898103140	GROMMET
50	895161	GEAR, Driven
51	898103141	GEAR PLATE
52	10-823042	BOLT
53	898103142	GEAR , Drive
54	23-895162001	COLLAR, Steel
55	12-16826	WASHER
56	11-8537227	NUT, Nylon
57	898103136	SHIFT SHAFT ASSEMBLY
58	17-16085003	PIN
59	24-813028003	SPRING
60	879147T86	COVER
61	25-853709007	GROMMET
62	10-898101953	BOLT
63	8M0155127	ROD, Choke
64	23-851858005	BUSHING
65	895124	PUMP ASSEMBLY, Priming
66	11-895177	NUT
67	54-898101964	CLIP
68	32-851848007	HOSE, Rubber (300 mm)
69	855562003	LINK ROD
70	855561010	SNAP, Link Rod
71	3303-853720T19	CARBURETOR ASSEMBLY
72	27-898101981	GASKET
73	37-859278004	DECAL, Start
74	11-85372214	CAP NUT
75	37-898101978	DECAL, Wiring Diagram
76	54-17169	CLAMP
77	25-898101963	GROMMET
78	37-859278003	DECAL, Throttle Only
79	25-898101962	GROMMET
80	87-8M0127937	SWITCH ASSEMBLY, Neutral
81	898103154	SHIFT ROD
82	87-853820A02	SWITCH ASSEMBLY, Start
83	10-8230427	BOLT, (M6 x 12)
84	54-953951	CLAMP
85	15920Q54	LANYARD ASSEMBLY
86	898103145	ROD, Throttle

▶Tiller Handle Conversion Kit, Electric - 8M0051060 (87 parts)

Ref	OEM Part #	Part Name
-	8M0051060	CONVERSION KIT, Tiller Handle, (Electric Remote Control to Electric Handle)
1	NSS	NOT SOLD SEPARATE, TILLER HANDLE ASSEMBLY
2	8M0051374	TILLER HANDLE
3	8M0051375	PLUG, Cap
4	8M0051377	GRIP
5	8M0051405	SWITCH ASSEMBLY, Stop
6	8M0221732	GRIP, Rubber
7	37-896853008	DECAL, Tiller Handle Shift-Rabbit
8	8M0051379	SHAFT, Throttle
9	10-878608	SCREW, (#10-16 x .500)
10	12-8M0108373	WASHER, Stainless Steel
11	8M0051388	COVER
12	8M0051386	PULLEY
13	8M0051387	HOUSING
14	8M0051391	CABLE, Throttle
15	54-22740	CLIP
16	10-8M0051381	SCREW
17	8M0051380	BRACKET, Aluminum
18	10-8M0051381	SCREW
19	10-8M0204707	BOLT
20	8M0051382	CLAMP, Friction - Throttle
21	24-8M0051384	SPRING, Stainless Steel
22	8M0051383	NUT
23	8M0051392	HANDLE, Carrying
24	8M0051400	COVER
25	10-823042	BOLT, Stainless Steel
26	10-8M0051402	BOLT, Stainless Steel
27	37-892904006	DECAL, Tiller Lock Release
28	87-892395A01	SWITCH ASSEMBLY, Stop
29	8M0032846	RETAINER, Brass
30	23-8M0051403	BUSHING, Plastic
31	8M0051393	COVER
32	10-8M0204707	BOLT
33	10-8M0136037	SCREW, Stainless Steel (M4 x 16)
34	8M0051396	LEVER, Tiller Lock - Stainless Steel
35	8M0051383	NUT
36	8M0051397	COLLAR, Stainless Steel
37	24-8M0051398	SPRING, Stainless Steel
38	12-8M0051404	WASHER, Rubber
39	10-8M0058362	BOLT, Steel
40	12-879194340	WASHER, Stainless Steel
41	NSS	NOT SOLD SEPARATE, GEAR ASSEMBLY, Throttle Only
42	10-8M0102279	BOLT
43	23-895126004	COLLAR, Stainless Steel (6.3 mm)
44	898103144	OPENER, Throttle
45	12-953921	WASHER, Stainless Steel
46	895101401	DRUM, Throttle
47	879147T85	BRACKET, Shift Lever
48	898103139	KNOB
49	25-898103140	GROMMET
50	895161	GEAR, Driven
51	898103141	GEAR PLATE
52	10-823042	BOLT
53	898103142	GEAR , Drive
54	23-895162001	COLLAR, Steel
55	12-16826	WASHER
56	11-8537227	NUT, Nylon
57	898103136	SHIFT SHAFT ASSEMBLY
58	17-16085003	PIN
59	24-813028003	SPRING
60	879147T86	COVER
61	25-853709007	GROMMET
62	10-898101953	BOLT
63	8M0155127	ROD, Choke
64	23-851858005	BUSHING
65	895124	PUMP ASSEMBLY, Priming
66	11-895177	NUT
67	54-898101964	CLIP
68	32-851848007	HOSE, Rubber (300 mm)
69	855562003	LINK ROD
70	855561010	SNAP, Link Rod
71	3303-853720T20	CARBURETOR ASSEMBLY
72	27-898101981	GASKET
73	37-859278004	DECAL, Start
74	11-85372214	CAP NUT
75	37-898101978	DECAL, Wiring Diagram
76	54-17169	CLAMP
77	25-898101963	GROMMET
78	37-859278003	DECAL, Throttle Only
79	25-898101962	GROMMET
80	87-8M0127937	SWITCH ASSEMBLY, Neutral
81	898103154	SHIFT ROD
82	87-853820A02	SWITCH ASSEMBLY, Start
83	10-8230427	BOLT, (M6 x 12)
84	54-953951	CLAMP
85	15920Q54	LANYARD ASSEMBLY
86	898103145	ROD, Throttle

▶Tools (3 parts)

Ref	OEM Part #	Part Name
-	91-8M0168899	TOOL KIT
NS	91-804762	SOCKET
1	91-899015A02	TOOL KIT, Gearcase

▶Top Cowl (9 parts)

Ref	OEM Part #	Part Name
-	37-8M0082467	DECAL, Horsepower 10
1	100-8M0074494	TOP COWL ASSEMBLY, Silver, Without Decals Comment: SN# 0R403399 & Up
2	26-8M0072631	SEAL Comment: SN# 0R403399 & Up
3	896696T01	HANDLE, Tilt Silver
4	896112001	SEAL, Rubber
5	896154001	SEAL, Rubber
6	12-953921	WASHER, Stainless Steel
7	11-8537227	NUT, Nylon
8	37-8M0076194	DECAL, Start Procedure Comment: Tiller Models SN# 0R547440 & Up

100-Hour / Annual Service Checklist

Regular maintenance keeps your Mercury 20 Carb(2CYL)(4-STROKE) running reliably season after season. Most of these tasks can be performed with basic tools and the factory service manual.

Replace water pump impeller and inspect wear plate
Change engine oil and oil filter (check drain plug washer)
Replace spark plugs and check ignition timing
Drain and refill lower unit gear oil; inspect for water contamination
Inspect fuel lines, primer bulb, and fuel filter for deterioration
Check and replace sacrificial anodes (zinc or aluminum)
Inspect propeller for damage; check shaft seal and cotter pin
Check valve clearance (refer to service manual for specifications)
Lubricate all grease points (steering, tilt tube, shift linkage)
Inspect control cables and throttle/shift linkage for smooth operation

Pro Tip: Always flush the engine with fresh water after saltwater use — even a quick 10-minute flush significantly extends component life.
Pro Tip: Use fuel stabilizer in the tank before winter storage, and fog the cylinders to prevent internal corrosion during extended periods of non-use.

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Mercury 20 Carb(2CYL)(4-STROKE) (0R235168 & Up) Parts & Diagrams

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