Mercury 20 (2 CYL.) (0G760300 THRU 0T979999) Parts & Diagrams

🔎 Mercury 20 (2 CYL.) Reference Library — Exploded parts diagrams (28 diagrams), specifications, common issues, and maintenance checklist.

The Mercury 20 (2 CYL.) 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 (2 CYL.):

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 (2 CYL.).

▶Accessories (1 parts)

Ref	OEM Part #	Part Name
-	87-823609A7	CONVERSION KIT, Tiller Handle Start Switch

▶Bottom Cowl (33 parts)

Ref	OEM Part #	Part Name
1	2193-9682A8	BOTTOM COWL Comment: (Black)
2	25-17231	GROMMET, Shift Shaft
3	10-4000332	SCREW, (M6 x 35)
4	17223	COVER, Harness
5	11-401366	NUT, (M6) Stainless Steel
6	11-401366	NUT, (M6) Stainless Steel
7	25-17226	GROMMET, Wire Harness
8	87-826677A3	SWITCH ASSEMBLY, Stop
9	8M0032846	RETAINER, Brass
10	15920Q54	LANYARD ASSEMBLY
11	19-17230	PLUG Comment: (Remote Control)
12	10-878608	SCREW, (#10-16 x .500)
13	39519	CUP Comment: (Remote Control)
14	25-8243641	GROMMET, Side Cover Comment: (Remote Control)
15	11-401366	NUT, (M6) Stainless Steel Comment: (Remote Control)
16	11-401366	NUT, (M6) Stainless Steel Comment: (Remote Control)
17	8M0053899	SIDE COVER Comment: (Remote Control)
18	56-8M0206596	SCREW, (M6 x 20) Comment: (Remote Control)
19	10-8M0214928	SCREW, (M6 x 16) Comment: (Remote Control)
20	8M0054857	SIDE COVER Comment: (Manual) (Tiller Shift)
21	25-824362	GROMMET Comment: (Tiller Shift)
22	56-8M0206596	SCREW, (M6 x 20) Comment: (Tiller Shift)
23	11-401366	NUT, (M6) Stainless Steel Comment: (Tiller Shift)
24	8M0054857	SIDE COVER Comment: (Manual) (Side Shift)
25	25-824361	GROMMET Comment: (Side Shift)
26	56-8M0206596	SCREW, (M6 x 20) Comment: (Side Shift)
27	11-401366	NUT, (M6) Stainless Steel Comment: (Side Shift)
28	10-852530	SCREW, (.250-20 x 1.50)
29	17220	LEVER, Cowl Latch
30	23-812707	BUSHING
31	816202	HOOK, Latch
32	13-37642	WAVE WASHER
33	11-17224	NUT, Latch Retaining

▶Carburetor(20/25/Jet 20) (32 parts)

Ref	OEM Part #	Part Name
-	804946T02	POWERHEAD ASSEMBLY
1	1390-817405A22	CARBURETOR KIT, (WMC-87) (25 Hp/Jet 20)
2	1395-96461	VALVE, Throttle Comment: (25Hp/Jet 20)
3	1395-96951	SHAFT, Throttle
4	1395-804997	SCREW
5	1395-804996	SPRING
6	1395-803861	VALVE, Inlet Needle
7	1399-3796	JET, (.076) Comment: (25Hp/Jet 20)
8	1395-9171	PLUG
9	1395-823648	COVER, Diaphragm
10	1395-9697	SCREW
11	15827A1	BODY
12	1395-9643	SCREW
13	1395-96371	COVER, Fuel Pump
14	1395-9762	PLUG
15	1395-97611	GASKET/DIAPHRAGM KIT
16	1395-8237072	REPAIR KIT
17	1395-9699	PLATE, Manual
18	1395-823433	CHOKE, Electric
19	1395-9696	SCREW
20	27-192061	GASKET, Carburetor
21	1395-9635	DIAPHRAGM/GASKET
22	1395-9633	GASKET
23	F10064	SHAFT
24	1395-824401	LEVER, Float
25	1395-9844A1	SERVICE KIT, Primer/Injector Comment: (See Illustrations for Contents)
26	1395-9164	BOWL, Fuel
27	1395-91691	FLOAT
28	27-44426	GASKET
29	1395-5902	SCREW, (#6-32 x .187)
30	10-40019111	SCREW, (M5 x 35)
31	11-400211	NUT, (M5) Stainless Steel

▶Carburetor(Seapro/Marathon 15/25 & Super 15) (32 parts)

Ref	OEM Part #	Part Name
-	804946T02	POWERHEAD ASSEMBLY
1	1392-823907T13	CARBURETOR, (WMC-56A)
2	815133	VALVE, Throttle Comment: (WMC-52A/56A)
3	1395-96951	SHAFT, Throttle
4	1395-804997	SCREW
5	1395-804996	SPRING
6	1395-803861	VALVE, Inlet Needle
7	1399-5317	JET, (.046) Comment: (WMC-52A/56A)
8	1395-9171	PLUG
9	1395-8113541	SHAFT, Choke
10	1395-811805	LEVER, Choke
11	15827A1	BODY
12	1395-9643	SCREW
13	1395-96371	COVER, Fuel Pump
14	1395-811806	VALVE, Choke
15	1395-97611	GASKET/DIAPHRAGM KIT
16	1395-8237072	REPAIR KIT
17	1395-9699	PLATE
18	1395-811360	SCREW, Bowl Drain
19	1395-9696	SCREW
20	27-192061	GASKET, Carburetor
21	1395-9635	DIAPHRAGM/GASKET
22	1395-9633	GASKET
23	F10064	SHAFT
24	1395-824401	LEVER, Float
25	27-44426	GASKET
26	1395-811353	BOWL, Fuel
27	1395-91691	FLOAT
28	1395-5902	SCREW, (#6-32 x .187)
29	817425	LINK, Choke
30	10-40019111	SCREW, (M5 x 35)
31	11-400211	NUT, (M5) Stainless Steel

▶Clamp Bracket Assembly (35 parts)

Ref	OEM Part #	Part Name
1	1497-8796A7	BRACKET ASSEMBLY, Transom Comment: (Storboard) (Black)
2	1497-8794A9	BRACKET ASSEMBLY, Transom Comment: (Port) (Black)
3	10-92767A3	THUMB SCREW ASSEMBLY, (16 mm)
4	NSS	NOT SOLD SEPARATE, Rivet
5	NSS	NOT SOLD SEPARATE, Handle
6	10-768042	SHOULDER SCREW, Hex
7	12-73719	WASHER
8	11-826709109	NUT, (.250-28) Stainless Steel
9	11-93164	NUT, (.875)
10	10-4000333	SCREW, (M6 x 40)
11	41042	HANDLE
12	23-818538	SPACER
13	12-71421	WASHER, Nylon
14	8M0035075	TILT TUBE
15	12-71421	WASHER, Nylon
16	37-8237011	DECAL, Co-Pilot
17	17-56373A2	PIN ASSEMBLY, Tilt
18	24-92995	SPRING
19	10-4000333	SCREW, (M6 x 40)
20	11-93164	NUT, (.875)
21	54-8M0085928	CLIP
22	10-814945	SCREW, (.312-18 x 3.500) Stainless Steel
23	12-67981	WASHER
24	11-815848	NUT, (.312)
25	11-826709109	NUT, (.250-28) Stainless Steel
26	10-41523	SCREW, (.250-28 x 1.00)
27	96965	LEVER, Starboard Side
28	11-826709109	NUT, (.250-28) Stainless Steel
29	24-44581	SPRING
30	10-41524	SCREW, (.250-28 x 1.75)
31	10-41524	SCREW, (.250-28 x 1.75)
32	13-31030	WAVE WASHER
33	11-826709109	NUT, (.250-28) Stainless Steel
34	90901	STRAP, Port Side
35	10-41523	SCREW, (.250-28 x 1.00)

▶Crankshaft, Pistons and Flywheel (34 parts)

Ref	OEM Part #	Part Name
-	804946T02	POWERHEAD ASSEMBLY
1	10-40001248	SCREW, (M12 x 25) Comment: SN# 0G845348/0P038444 & Up
2	12-86496	WASHER
3	258-859232T13	FLYWHEEL Comment: (Commercial)
4	NSS	NOT SOLD SEPARATE, Decal-Warning
5	NSS	NOT SOLD SEPARATE, Decal-Warning
6	43-99301	RING GEAR Comment: (Electric)
7	10-88190313	SCREW, (M5 x 13) Comment: (Electric)
8	26-859741	SEAL, Oil
9	31-85114T	BEARING, Roller - Upper
10	28-20094	KEY, Woodruff
11	464-8978T2	CRANKSHAFT ASSEMBLY
12	822445A1	WEAR SLEEVE
13	NSS	NOT SOLD SEPARATE, O-Ring
14	26-85107	SEAL, Oil, Lower
15	31-85113T	BEARING, Roller - Lower
16	630-8835A4	CONNECTING ROD ASSEMBLY
17	10-91012	SCREW, (.250-28 Special)
18	31-879877A1	BEARING ASSEMBLY, Roller
19	NSS	NOT SOLD SEPARATE, Roller
20	29-98295	BEARING, Needle
21	12-8M0012294	BEARING
22	767-879878A6	PISTON ASSEMBLY Comment: (.030 Oversize)
23	40-828119	LOCK RING, Piston Pin
24	39-18652A2	RING SET, Piston Comment: (.030 Oversize)
25	NSS	NOT SOLD SEPARATE, Piston Ring
26	86992A5	BEARING ASSEMBLY, Center Main
27	NSS	NOT SOLD SEPARATE, Bearing
28	NSS	NOT SOLD SEPARATE, Thrust Washer
29	NSS	NOT SOLD SEPARATE, Thrust Washer
30	NSS	NOT SOLD SEPARATE, Needle Roller
31	NSS	NOT SOLD SEPARATE, Thrust Washer
32	NSS	NOT SOLD SEPARATE, Needle Roller
33	NSS	NOT SOLD SEPARATE, Thrust Washer

▶Cylinder Block and Covers (46 parts)

Ref	OEM Part #	Part Name
-	27-41499A88	GASKET SET
1	872-9533T40	CYLINDER BLOCK
2	22-15133	FITTING (45 Degrees)
3	17-85171	PIN, Dowel
4	10-40001209	SCREW, (M10 x 60)
5	16-429173	STUD
6	NSS	NOT SOLD SEPARATE, Decal-Serialization
7	10-40019111	SCREW, (M5 x 35)
8	11-400211	NUT, (M5) Stainless Steel
9	27-414172	GASKET
10	14112T	REED BLOCK
11	27-414181	GASKET
12	41420A3	PLATE ASSEMBLY, Carb Adaptor
13	21-889781	CHECK VALVE
14	10-40011108	SCREW, (M5 x 20) Stainless Steel
15	32-892024122	TUBING, (20.00 Feet Bulk) (Cut to 13.25 Inch Length)
16	25-822370	O-RING, (2.362 x .103)
17	14408	COVER
18	10-40011107	SCREW, (M5 x 16) Stainless Steel
19	54-8M0024808	J CLIP Comment: (Quanity of 2 on Remote Control)
20	10-40011107	SCREW, (M5 x 16) Stainless Steel
21	14406	COVER
22	25-86391	O-RING
23	27-863895	GASKET
24	1028-8282A1	COVER ASSEMBLY
25	NSS	NOT SOLD SEPARATE, Cover
26	22-390721	PLUG, Pipe (.125-27) Brass Comment: (Electric RC)
27	10-4000331	SCREW, (M6 x 30)
28	22-94848	FITTING
29	32-8M0108355	HOSE, (57.00 Inches Bulk) (Cut to 8.00 Inch Length)
30	22-996642	FITTING, Elbow 90 Degree (.125-27 x .250) Nylon
31	10-4000333	SCREW, (M6 x 40)
32	143171	COVER
33	27-14318005	GASKET
34	27-8M0204714	GASKET
35	14586	THERMOSTAT
36	25-822370	O-RING, (2.362 x .103)
37	144071	COVER Comment: SN# 0P042111 & Below
38	54-825404	STRAP
39	10-40011107	SCREW, (M5 x 16) Stainless Steel
40	27-892158	GASKET, Exhaust Manifold
41	92329F03	MANIFOLD, Exhaust
42	27-892157	GASKET, Exhaust Manifold Cover
43	923301	COVER
44	10-4000333	SCREW, (M6 x 40)
45	16-8161945	STUD, (M6 x 32) Comment: (Seapro/Marathon) SN# 0G845347/0P038443 & Below

▶Driveshaft Housing Assembly (21 parts)

Ref	OEM Part #	Part Name
-	804946T02	POWERHEAD ASSEMBLY
1	158664	SEAL, Adaptor Plate
2	99702A7	ADAPTOR PLATE ASSEMBLY
3	27-41670006	GASKET, Adaptor Plate
4	10-8M0204741	SCREW, (M6 x 20) Stainless Steel
5	41211	BRACKET
6	NSS	NOT SOLD SEPARATE, Exhaust Tube
7	96248A1	HOUSING ASSEMBLY
8	23-889715	SPACER
9	26-25329	SEAL
10	10-40011107	SCREW, (M5 x 16) Stainless Steel
11	32-86292	TUBE, Water Comment: (Long Shaft)
12	1588-9098T5	HOUSING ASSEMBLY, Driveshaft Comment: (Black-Long Shaft)
13	27-433374	GASKET, Drive Shaft Housing
14	27-14621	GASKET
15	14534	COVER
16	10-14742	SCREW, (.250-20 x 1.25)
17	10-1993870	SCREW, (M8 x 70)
18	12-4002317	WASHER
19	10-8M0204741	SCREW, (M6 x 20) Stainless Steel
20	17258T	TRIM COVER Comment: (Black)

▶Electric Start Components (37 parts)

Ref	OEM Part #	Part Name
1	853358T1	RECTIFIER Comment: SN# USA-0T409000/BEL-0P153500 & Up
2	10-883075	SCREW, (#10-16 x 1.25) Comment: SN# USA-0T409000/BEL-0P153500 & Up
3	84-11149A54	HARNESS ASSEMBLY, Adaptor
4	89-8M0185147	SOLENOID ASSEMBLY, Starter
5	23-8M0214955	BUSHING
6	25-818967	GROMMET
7	84-88809A5	WIRE ASSEMBLY
8	10-40011129	SCREW, (M6 x 25) Stainless Steel
9	8-32,11-26419	NUT, Brass
10	11-64015	NUT, (.250-20)
11	85-97861	INSULATOR
12	11-64015	NUT, (.250-20)
13	92753	RETAINER
14	84-92436A9	HARNESS ASSEMBLY, Engine Wiring Comment: SN# USA-0T409000/BEL-0P153500 & Up
15	88-8M0207796	FUSE, 20 Ampere
16	50-8M0033984	STARTER MOTOR ASSEMBLY
17	10-96566	THRU BOLT
18	96564T	END CAP, With Brushes
19	96565	ARMATURE
20	96563T	END CAP
21	96562	DRIVE
22	96561	DRIVE KIT
23	10-421251	SCREW, (M8 x 55)
24	824918	CLIP Comment: (Local Electric)
25	87-823609A6	SWITCH ASSEMBLY, Start/Stop Comment: (Local Electric)
26	889734	HOUSING Comment: (Local Electric)
27	84-88439A28	CABLE ASSEMBLY, Battery - Black
28	84-88439A27	CABLE ASSEMBLY, Red - Battery
29	17461T11	MODULE KIT, Tachometer Adaptor
30	13541	PLUG, Male
31	54-816311T	TIE STRAP, (8.00 Inches)
32	8M0058226	RECTIFIER Comment: SN# USA-0T408999/BEL-0P153499 & Below
33	10-48409	SCREW, (#10-16 x .625) Stainless Steel Comment: SN# USA-0T408999/BEL-0P153499 & Below
34	10-32,11-45076	NUT, Brass Comment: SN# USA-0T408999/BEL-0P153499 & Below
35	10-32,11-45076	NUT, Brass Comment: SN# USA-0T408999/BEL-0P153499 & Below
36	84-79139A20	CABLE ASSEMBLY, Red Comment: SN# USA-0T408999/BEL-0P153499 & Below
37	84-92436A5	HARNESS ASSEMBLY Comment: SN# USA-0T408999/BEL-0P153499 & Below

▶Fuel System Components (29 parts)

Ref	OEM Part #	Part Name
-	804946T02	POWERHEAD ASSEMBLY
1	35-889527A07	FILTER ASSEMBLY, Fuel
2	858731	BALL, Fuel Filter
3	35-87946Q04	FILTER KIT, Fuel
4	25-897536	SEAL
5	32-8M0108355	HOSE, (57.00 Inches Bulk) (Cut to 7.50 Inch Length)
6	32-8M0108355	HOSE, (57.00 Inches Bulk) (Cut to 5.50 Inch Length)
7	54-816311T	TIE STRAP, (8.00 Inches)
8	127332	WIRE, Fast Idle
9	24-11277	SPRING, Tension
10	128053	LEVER, Fast Idle
11	12803	BRACKET, Primer
12	174421	COVER, Carburetor
13	19-47579	PLUG
14	10-40011110	SCREW, (M5 x 30) Stainless Steel
15	10-79965	SCREW, (#8-32 x .500) Stainless Steel
16	10-12110	SCREW, (#6-32 x .750)
17	11-821979	NUT
18	112731	LEVER, Primer
19	11280	CAM BLOCK
20	53-11278	CLIP, Retaining
21	172291	BEZEL, Choke
22	128022	PRIMER KNOB
23	1390-817405T23	CARBURETOR, (WMC-65) (25 Hp/Jet 20
24	11-400213	NUT, (M8) Stainless Steel
25	27-192061	GASKET, Carburetor
26	22-15781A9	CONNECTOR KIT, Fuel
27	10-8M0204707	SCREW, (M6 x 25)
28	25-18202	GROMMET

▶Fuel System Components(Commercial Engines) (25 parts)

Ref	OEM Part #	Part Name
-	804946T02	POWERHEAD ASSEMBLY
1	35-889527A07	FILTER ASSEMBLY, Fuel
2	858731	BALL, Fuel Filter
3	35-87946Q04	FILTER KIT, Fuel
4	25-897536	SEAL
5	32-8M0108355	HOSE, (57.00 Inches Bulk) (Cut to 7.50 Inch Length)
6	32-8M0108355	HOSE, (57.00 Inches Bulk) (Cut to 5.50 Inch Length)
7	54-816311T	TIE STRAP, (8.00 Inches)
8	25-18202	GROMMET
9	22-15781A9	CONNECTOR KIT, Fuel
10	10-8M0204707	SCREW, (M6 x 25)
11	53-11278	CLIP, Retaining
12	817426	INSERT, Choke Bezel
13	172291	BEZEL, Choke
14	817424	KNOB, Choke
15	817425	LINK, Choke
16	174421	COVER, Carburetor
17	19-47579	PLUG
18	10-40011110	SCREW, (M5 x 30) Stainless Steel
19	41750T	INSERT
20	10-40011107	SCREW, (M5 x 16) Stainless Steel
21	8243701	STOP, Throttle
22	11-400213	NUT, (M8) Stainless Steel
23	1390-817405T20	CARBURETOR, (WMC-54A)
24	27-192061	GASKET, Carburetor

▶Gasket Set Components, Engine Overhaul (1 parts)

Ref	OEM Part #	Part Name
-	85977002	SEAL, Rubber, Reed Block Comment: (Not Used In This Application)

▶Gear Housing(Driveshaft) (2.25:1 Gear Ratio) (44 parts)

Ref	OEM Part #	Part Name
-	46-99157T2	PUMP KIT, Water
1	1600-8M0083538	GEAR HOUSING ASSEMBLY, Basic-Black Comment: (Black)
2	41121	SLEEVE
3	26-99325	SEAL
4	31-41326	BEARING, Roller
5	17-8M0084726	PIN, Dowel (.187 x .530)
6	10-79953Q04	SCREW KIT, (.375-16 x .250) Drain
7	12-191833	WASHER
8	35-41133	SCREEN, Water Inlet Port
9	10-40031112	SCREW, (M5 x 40)
10	22-8M0058389	FITTING KIT, Magnetic, Plug Fill/Drain
11	12-191833	WASHER
12	35-41134	SCREEN
13	11-401365	NUT, (M5) Stainless Steel
14	31-98294A1	BEARING ASSEMBLY, Roller
15	NSS	NOT SOLD SEPARATE, Cup
16	10-49908	SCREW, (.250-28 x .750)
17	43-98302	GEAR, Pinion (12 Teeth)
18	27-993261	GASKET
19	85083	FACE PLATE
20	12-866451	WASHER
21	28-8M0214993	KEY
22	47-8M0204712	IMPELLER
23	12-866451	WASHER
24	25-69202	O-RING
25	46-99157A02	PUMP ASSEMBLY, Water
26	NSS	NOT SOLD SEPARATE, Insert
27	26-85090001	SEAL
28	25-86203	O-RING, Rubber
29	10-8248324	SCREW, (M6 x 16)
30	12-8M0204649	WASHER, (.281 x .500 x .060) Stainless Steel
31	862933	SHIFT SHAFT Comment: (Long Shaft)
32	45-99198	DRIVESHAFT Comment: (Long Shaft)
33	85552001	BOOT
34	93878	RETAINER
35	25-35276	O-RING, (.734 x .139) Comment: (.734 x .139)
36	25-85594	O-RING, (.239 x .174) Comment: (.239 x .174)
37	12-85091	WASHER
38	24-93007	SPRING
39	12-8M0204649	WASHER, (.281 x .500 x .060) Stainless Steel
40	17-85593	PIN, (.078 x .437)
41	85562A2	SHIFT CAM
42	17-85096	PIN, Drive
43	23-29804T	SLEEVE

▶Gear Housing, Propeller Shaft - 2.25:1 Gear Ratio (28 parts)

Ref	OEM Part #	Part Name
-	26-85090A2	SEAL KIT
1	1600-8M0083538	GEAR HOUSING ASSEMBLY, Basic-Black Comment: (Black)
43	97-98432Q6	TRIM TAB
44	10-4000354	SCREW, (M8 x 30)
45	12-8M0042642	WASHER, (.323 x .563 x .063) Stainless Steel
46	12-43328	WASHER
47	10-87810178	SCREW, (M10 x 35) Stainless Steel
48	31-8M0103470	BEARING ASSEMBLY, Roller
49	NSS	NOT SOLD SEPARATE, Cup
50	43-44213T1	GEAR, Forward (27 Teeth)
51	23-85557	BUSHING
52	85094	FOLLOWER, Cam
53	24-38114	SPRING
54	52-41040T1	CLUTCH
55	17-8M0020999	PIN
56	24-88680	SPRING
57	44-8166231	PROPELLER SHAFT
58	43-99542T	GEAR, Reverse (27 Teeth)
59	99906T1	CARRIER ASSEMBLY, Bearing
60	31-21739	BEARING, Roller
61	26-41132	SEAL, Oil, Inner
62	26-41131	SEAL, Oil, Outer
63	25-85549	O-RING
64	87293	PLATE
65	10-90883	SCREW, (M5 x 16)
66	858498	THRUST HUB ASSEMBLY
67	48-19638A40	PROPELLER Comment: (Sea Pro/Marathon 15/25/Super 15)
68	11-4011912	PROP NUT Comment: (Sea Pro/Marathon 15/25/Super 15)

▶Ignition/Electrical Components (30 parts)

Ref	OEM Part #	Part Name
NS	13540	CAP, Female
1	997621	COVER, Ignition Coil
2	10-1994155	SCREW, (M5 x 55)
3	855721T8	STATOR ASSEMBLY
4	10-4013910	SCREW, (M5 x 10)
5	54-856999	STRAP Comment: (Design II)
6	10-62568	SCREW, (#10-16 x .375)
7	8M0084613	C WASHER
8	855713A3	SWITCHBOX ASSEMBLY Comment: (Commercial/Jet 20)
9	10-40019111	SCREW, (M5 x 35)
10	10-62568	SCREW, (#10-16 x .375)
11	98450A10	TRIGGER ASSEMBLY
12	86704T11	STATOR AUXILIARY Comment: SN# 0T409000/0P153500 & Up
13	10-4013930	SCREW, (M5 x 30)
14	54-816311T	TIE STRAP, (8.00 Inches)
15	33-938	SPARK PLUG Comment: (NGK #BPZ8H-N-10) (CAN/BELG.)
16	84-813715A2	CABLE SET, High Tension (5 and 8.25 Inch)
17	NSS	NOT SOLD SEPARATE, Hi-Tension Cable
18	85-63709A1	BOOT/TERMINAL KIT
19	54-816311T	TIE STRAP, (8.00 Inches)
20	339-832757A4	COIL KIT
21	10-32,11-45076	NUT, Brass
22	84-88807A10	CABLE ASSEMBLY, Black
23	54-24836	CLIP
24	10-48408	SCREW, (#10-16 x .500)
25	54-22740	CLIP Comment: (Design I)
26	86-638131	TERMINAL BLOCK Comment: SN# 0T408999/0P153499 & Below
27	10-48409	SCREW, (#10-16 x .625) Stainless Steel Comment: SN# 0T408999/0P153499 & Below
28	10-62568	SCREW, (#10-16 x .375) Comment: SN# 0T408999/0P153499 & Below
29	86704A10	STATOR, Auxiliary Comment: SN# 0T408999/0P153499 & Below

▶Jet Linkage (14 parts)

Ref	OEM Part #	Part Name
1	11-87599	NUT
2	10,13-26996	LOCKWASHER, Stainless Steel
3	8239522	SHIFT HANDLE
4	828251	ROD END
5	24-828252	SPRING
6	12-846673	WASHER, (.265 x .500 x .060) Stainless Steel
7	18-56206	COTTER PIN
8	11-29598	NUT, (.250-28) Stainless Steel
9	828253	LEVER, Shift
10	10-828254	SCREW, (#10-32 x .750)
11	10-828255	SCREW, (#10-32 x 2.50)
12	828256	SHIFT ROD
13	828257	ROD END
14	828258	TILT LATCH ROD

▶Jet Pump Assembly (27 parts)

Ref	OEM Part #	Part Name
-	856143A4	JET PUMP ASSEMBLY Comment: (With Stainless Steel Impeller)
1	801411251	HOUSING, Pump
2	32-827490	HOSE, Lube
3	878376	SHIFT LINKAGE KIT
4	878381	CAM
5	878378	GATE, Reverse - With Bumper
6	47-855708T25	IMPELLER Comment: (Stainless Steel)
7	80141225	HOUSING, Intake
8	827188T	LINER
9	45-8M0084536	DRIVESHAFT
10	12-879652	THRUST WASHER
11	30-879653	BEARING, Ball
12	23-827189	SLEEVE
13	11-827190	NUT
14	801430	ADAPTOR
15	801431	BASE, Pump
16	10-846500	SCREW, (#10-32 x 1.00) Stainless Steel
17	10-19925125	SCREW, (.375-16 x 1.25)
18	12-34931	WASHER, (.406 x .734 x .063) Stainless Steel
19	10-19924200	SCREW, (.312-18 x 2.00)
20	12-8M0207778	WASHER
21	10-801432	SCREW, (M10 x 35)
22	28-801405625	KEY, Impeller
23	15-801404625	SHIM, Impeller
24	14-801403625	TAB WASHER
25	10-90192	SCREW, (.250-20 x .750) Stainless Steel
26	10-F2211	SCREW, (#10-24 x .625) Stainless Steel

▶Jet Water Pump Components (12 parts)

Ref	OEM Part #	Part Name
-	46-99157T2	PUMP KIT, Water
1	85083	FACE PLATE
2	12-866451	WASHER
3	28-8M0214993	KEY
4	47-8M0204712	IMPELLER
5	12-866451	WASHER
6	25-69202	O-RING
7	46-99157A02	PUMP ASSEMBLY, Water
8	NSS	NOT SOLD SEPARATE, Insert
9	26-85090001	SEAL
10	25-86203	O-RING, Rubber
11	10-8248324	SCREW, (M6 x 16)

▶Lube Chart (1 parts)

Ref	OEM Part #	Part Name
-	NOPART	NO PARTS LIST

▶Service/Support Material (1 parts)

Ref	OEM Part #	Part Name
0	37-855920	DECAL, EPA Label Information Comment: (Export-1999)

▶Starter Assembly(Manual) (33 parts)

Ref	OEM Part #	Part Name
-	90906A23	STARTER ASSEMBLY, Recoil Comment: SN# 0G845348/0P0384444 & Up
1	86689A5	HOUSING ASSEMBLY, Starter
2	10-826253	SCREW, (.250-20 x .625)
3	53-818853	RING, Retaining
4	833161T	FELT PAD
5	24-86857T01	SPRING
6	50-825269T01	SHEAVE, Starter
7	24-86851T02	SPRING
8	868501	CAM
9	53-86849T01	RING, Retaining
10	86853T01	CAM
11	24-868523	SPRING
12	50-12066Q10	ROPE
13	85174A1	HANDLE ASSEMBLY
14	NSS	NOT SOLD SEPARATE, Retainer
15	44180	BUSHING, Rope
16	426264	SUPPORT
17	10-40019111	SCREW, (M5 x 35)
18	23-309772	SPACER
19	856154T01	SUPPORT
20	11-401385	NUT, (M5) Stainless Steel
21	93876T02	LEVER, Lower
22	17-38489	PIN, Roll
23	24-823778	SPRING, Upper Lock Lever
24	858925	LEVER, Upper
25	8M0183792	BUSHING
26	10-1993735	SCREW, (M6 x 35), Non-Seapro/Marathon Comment: SN# 0G845347/0P038443 & Below
27	37-8272822	DECAL, Warning, High Voltage
28	NSS	NOT SOLD SEPARATE, Decal-Servicing Referrral
29	37-881865	DECAL, Caution-Start in Gear Comment: (Start In Gear) (Remote Control)
30	NSS	NOT SOLD SEPARATE, Decal-Emergency Start Procedure
31	12-69056	WASHER, (.255 x .620 x .030) Stainless Steel Comment: (Commercial Engines)
32	11-401386	NUT, (M6) Comment: (Commercial Engines)

▶Swivel Bracket Assembly (53 parts)

Ref	OEM Part #	Part Name
-	27-41499A88	GASKET SET
1	165541	ROD, Reverse Hook
2	11-8M0204726	NUT, (.375-24) Stainless Steel Comment: (Tiller Handle)
3	821959	HANDLE Comment: (Tiller Handle)
4	12-29330	WASHER Comment: (Tiller Handle)
5	821957	BRAKE PLATE Comment: (Tiller Handle)
6	8165621	DISC Comment: (Tiller Handle)
7	822238A9	SWIVEL HEAD Comment: (Black)
8	821958A1	PLATE KIT Comment: (Tiller Handle)
9	10-40011126	SCREW, (M6 x 13) Stainless Steel Comment: (Tiller Handle)
10	8165621	DISC Comment: (Tiller Handle)
11	821961	ROD Comment: (Tiller Handle)
12	3415-822237A3	SWIVEL BRACKET Comment: (Black)
13	22-8M0169589	FITTING, Grease
14	22-8M0169589	FITTING, Grease
15	22-8M0169589	FITTING, Grease
16	23-85154A1	BUSHING KIT
17	25-86993	O-RING
18	NSS	NOT SOLD SEPARATE, Bushing
19	NSS	NOT SOLD SEPARATE, Bushing
20	NSS	NOT SOLD SEPARATE, Washer
21	98830A3	HOOK ASSEMBLY, Reverse Lock
22	24-879894	SPRING Comment: (All Other Models)
23	24-96018	SPRING
24	53-13194	RING, Retaining Comment: (Tiller Handle)
25	17-13195	PIN
26	12756	BRACKET Comment: (Tiller Handle)
27	24-12754	SPRING Comment: (Tiller Handle)
28	12758	LEVER Comment: (Tiller Handle)
29	53-13194	RING, Retaining Comment: (Tiller Handle)
30	17232A1	COVER Comment: (Tiller Handle)
31	10-19943100	SCREW, (M8 x 100)
32	10-1994360	SCREW, (M8 x 60)
33	12-36001	WASHER
34	11-400213	NUT, (M8) Stainless Steel
35	85123001	BUMPER, Front
36	85122001	MOUNT
37	10-125161	SCREW, (M8 x 133.35) Upper Mount
38	14894	MOUNT
39	12-85172	WASHER, Upper Mount Screw
40	12-43430	WASHER
41	11-400213	NUT, (M8) Stainless Steel
42	10-849838	SCREW, (.375-24 x 1.25) Comment: (Remote Control)
43	41323A03	ATTACHING KIT, Steering Link Comment: (Remote Control)
44	12-37828	WASHER, (.390 x .625 x .062) Stainless Steel Comment: (Remote Control)
45	11-8M0204726	NUT, (.375-24) Stainless Steel Comment: (Remote Control)
46	96186A2	BRACKET ASSEMBLY Comment: (Remote Control)
47	10-1993325	SCREW, (M10 x 25) Comment: (Remote Control)
48	13-400248	LOCKWASHER, (M10) Comment: (Design I) (Remote Control)
49	NSS	NOT SOLD SEPARATE, Decal-Serial Overlaminate
50	11-8M0204726	NUT, (.375-24) Stainless Steel Comment: (Remote Control)
51	12-37828	WASHER, (.390 x .625 x .062) Stainless Steel
52	96201	STRAP, Key (Included with Ride Guide Bracket) Comment: (Design II) (Remote Control)

▶Throttle and Shift Linkage(Remote Control) (39 parts)

Ref	OEM Part #	Part Name
1	10-8M0204707	SCREW, (M6 x 25)
2	12-65567	WASHER, (.265 x .750 x .048) Stainless Steel
3	13-99611	WAVE WASHER
4	23-823806	BUSHING
5	8319781	CAM, Throttle
6	24-42164	SPRING
7	888191	SPARK ARM
8	8327471	TIMING LINK
9	42161	LINK INTERLOCK
10	8236103	LEVER, Interlock Control
11	10-8M0204707	SCREW, (M6 x 25)
12	12-69056	WASHER, (.255 x .620 x .030) Stainless Steel
13	23-823806	BUSHING
14	823862	LEVER, Backplate
15	8238632	LEVER, Horizontal Shift Shaft, Port
16	8236011	SHIFT SHAFT, Horizontal
17	24-826077	SPRING, Detent
18	824994	SPRING, Plate
19	10-40011107	SCREW, (M5 x 16) Stainless Steel
20	881228A1	SHIFT ROD ASSEMBLY
21	817428	SOCKET
22	10-32,11-45076	NUT, Brass
23	881227A3	LINK ASSEMBLY, Throttle
24	817428	SOCKET
25	10-32,11-45076	NUT, Brass
26	23-825319	NYLINER
27	8251681	LEVER, Shift
28	822459	RETAINER
29	11-825677	PUSH NUT
30	12-35280	WASHER, (.255 x .620 x .030) Stainless Steel
31	11-401386	NUT, (M6)
32	23-825319	NYLINER
33	825169	LEVER, Throttle
34	822459	RETAINER
35	11-825677	PUSH NUT
36	12-35280	WASHER, (.255 x .620 x .030) Stainless Steel
37	11-401386	NUT, (M6)
38	8251701	BRACKET, Mounting
39	10-4006731	SCREW, (M6 x 16)

▶Throttle and Shift Linkage(Side Shift) (24 parts)

Ref	OEM Part #	Part Name
1	42161	LINK INTERLOCK
2	8236103	LEVER, Interlock Control
3	10-8M0204707	SCREW, (M6 x 25)
4	12-69056	WASHER, (.255 x .620 x .030) Stainless Steel
5	23-823806	BUSHING
6	823862	LEVER, Backplate
7	24-826077	SPRING, Detent
8	824994	SPRING, Plate
9	10-40011107	SCREW, (M5 x 16) Stainless Steel
10	8238632	LEVER, Horizontal Shift Shaft, Port
11	8236011	SHIFT SHAFT, Horizontal
12	8239521	SHIFT HANDLE
13	10-40019108	SCREW, (M5 x 20)
14	12-4002314	WASHER
15	8237582	BRACKET, Cable Anchor
16	12-65567	WASHER, (.265 x .750 x .048) Stainless Steel
17	13-99611	WAVE WASHER
18	8319781	CAM, Throttle
19	24-42164	SPRING
20	888191	SPARK ARM
21	8327471	TIMING LINK
22	10-8M0204707	SCREW, (M6 x 25)
23	23-823806	BUSHING
24	10-4006731	SCREW, (M6 x 16)

▶Throttle and Shift Linkage(Tiller Handle Shift) (39 parts)

Ref	OEM Part #	Part Name
1	87-813960A4	SWITCH ASSEMBLY Comment: (Local Electric)
2	10-88075020	SCREW, (M3.5 x 20) Stainless Steel Comment: (Local Electric)
3	824923	PLATE Comment: (Local Electric)
4	54-12627	STRAP Comment: (Local Electric)
5	10-40011107	SCREW, (M5 x 16) Stainless Steel Comment: (Local Electric)
6	42161	LINK INTERLOCK
7	8236103	LEVER, Interlock Control
8	10-8M0204707	SCREW, (M6 x 25)
9	12-69056	WASHER, (.255 x .620 x .030) Stainless Steel
10	23-823806	BUSHING
11	823862	LEVER, Backplate
12	8238632	LEVER, Horizontal Shift Shaft, Port
13	8236011	SHIFT SHAFT, Horizontal
14	881228A2	SHIFT LINK ASSEMBLY
15	817428	SOCKET
16	10-32,11-45076	NUT, Brass
17	881227A1	LINK ASSEMBLY, Throttle
18	817428	SOCKET
19	10-32,11-45076	NUT, Brass
20	10-8M0204707	SCREW, (M6 x 25)
21	12-65567	WASHER, (.265 x .750 x .048) Stainless Steel
22	13-99611	WAVE WASHER
23	23-823806	BUSHING
24	8319781	CAM, Throttle
25	24-42164	SPRING
26	888191	SPARK ARM
27	8327471	TIMING LINK
28	8238083	SECONDARY GEAR
29	8238092	PRIMARY GEAR
30	23-823806	BUSHING
31	30-93008	BALL
32	24-8M0215005	SPRING
33	56-8M0206596	SCREW, (M6 x 20)
34	12-69056	WASHER, (.255 x .620 x .030) Stainless Steel
35	10-4000331	SCREW, (M6 x 30)
36	12-69056	WASHER, (.255 x .620 x .030) Stainless Steel
37	23-823807	BUSHING
38	8238102	CONTROL PLATFORM
39	10-4006731	SCREW, (M6 x 16)

▶Tiller Handle Assembly (30 parts)

Ref	OEM Part #	Part Name
-	821468T2	TILLER HANDLE Comment: (Black) (Side Shift)
1	822148A2	COVER KIT Comment: (Side Shift)
2	822150	PULLEY
3	NSS	NOT SOLD SEPARATE, Case
4	10-878608	SCREW, (#10-16 x .500)
5	432426	CABLE, Throttle Comment: (Side Shift)
6	432426	CABLE, Throttle Comment: (Side Shift)
7	85-960099	SLEEVE, (12.00 Inches)
8	821468A66	ARM ASSEMBLY, Steering Handle Comment: (Black)
9	10-4010516	SCREW, (M5 x 16) Stainless Steel
10	10-40011107	SCREW, (M5 x 16) Stainless Steel
11	821972T	KNOB, Throttle
12	24-96203	SPRING
13	892995	LOCK, Throttle
14	10-8M0204707	SCREW, (M6 x 25)
15	821463T01	TILLER TUBE
16	37-8242004	DECAL Comment: (Side Shift)
17	821465	HANDLE, Throttle Comment: (Side Shift)
18	8M0221732	GRIP
19	87-823609A18	SWITCH ASSEMBLY, Start/Stop Comment: (Black)
20	822441	RETAINER
21	8221471	PLATE
22	23-823939	BUSHING
23	10-4000384	SCREW, (M10 x 80)
24	822841F1	BRACKET Comment: (Black)
25	23-823939	BUSHING
26	12-822145	WASHER
27	13-826792	WAVE WASHER
28	12-822145	WASHER
29	12-822146	WASHER

▶Tools, Special (1 parts)

Ref	OEM Part #	Part Name
-	91-30500	GREASE GUN

▶Top Cowl (16 parts)

Ref	OEM Part #	Part Name
1	2190-9163T21	TOP COWL ASSEMBLY Comment: (Silver)
2	44311F5	SHIELD, Rear Comment: (Silver)
3	10-400018	SCREW, (M5 x 12)
4	12-73288	WASHER, (.220 x .500 x .030) Stainless Steel
5	17221	LATCH, Cowl
6	10-400033	SCREW, (M5 x 12)
7	17773A2	SEAL, Cowl
8	815625A02	SOUND BLANKET KIT
9	NSS	NOT SOLD SEPARATE, Sound Blanket
10	NSS	NOT SOLD SEPARATE, Sound Blanket
11	10-400033	SCREW, (M5 x 12)
12	812413A1	BRACKET ASSEMBLY, Roller
13	18517	SHIM, Cowl Latch
14	37-855920	DECAL, EPA Label Information Comment: (Export-1999)
15	90-134254	DECAL, Starting Procedures
16	37-111851	SHIFT DECAL Comment: (Jet)

100-Hour / Annual Service Checklist

Regular maintenance keeps your Mercury 20 (2 CYL.) 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 (2 CYL.) (0G760300 THRU 0T979999) Parts & Diagrams

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