Mercury 4/5 (0A855097 THRU 0G710612) Parts & Diagrams

🔎 Mercury 4/5 Reference Library — Exploded parts diagrams (15 diagrams), specifications, common issues, and maintenance checklist.

The Mercury 4/5 is a 4-Stroke, 1-Cylinder outboard motor. Designed for dinghies, inflatable boats, and small tenders where lightweight portability is essential.

Quick Reference Specifications

Specification	Value
Engine Type	4-Stroke, 1-Cylinder
Horsepower	4 HP
Displacement	123 cc
Bore x Stroke	59 mm x 45 mm
Spark Plug (Type & Gap)	NGK DPR6EA-9
Engine Oil Capacity	0.45 L (15 fl oz)
Recommended Engine Oil	SAE 10W-30 Mercury 4-Stroke Outboard Oil
Gear Case Oil Capacity	189 mL (6 fl oz)
Idle Speed (in gear)	1100 RPM (in gear)
Full Throttle RPM Range	4500-5500
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 4/5:

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 4/5.

▶ACCESSORIES (23 parts)

Ref	OEM Part #	Part Name
1	16837A2	ALTERNATOR KIT
2	16074T	ALTERNATOR
3	10-16059	SCREW
4	54-16060	CLAMP
5	10-16821	SCREW
6	16838A4	RECTIFIER KIT
7	16076A1	RECTIFIER
8	89-16077	FUSE
9	10-16078	SCREW
10	13-16079	LOCKWASHER
11	12-8M0108373	WASHER, Stainless Steel
12	54-813275	CLAMP Comment: (2-1/2)
13	11-16081	NUT, Stainless Steel
14	84-16822	HARNESS, Extension
15	25-16823	GROMMET
16	84-16082	CABLE, Battery
17	16839A4	GUIDE KIT, Vertical Rope
18	16839A4	BRACKET
19	16113	PLATE, Seal
20	10-17173	SCREW
21	16841Q02	FLUSHING ATTACHMENT
22	NLA	No Longer Available
23	84125T	REGULATOR ASSEMBLY, Voltage

▶CARBURETOR (48 parts)

Ref	OEM Part #	Part Name
-	16115A03	GASKET SET, Powerhead
1	3303-812648T	CARBURETOR Comment: (5 H.P.)
2	812650	MAIN NOZZLE Comment: (5 H.P.) (SEE NOTE 1)
3	78,16250	MAIN JET
4	52,16251	JET, Pilot Comment: (5 H.P.)
5	16252	CAP
6	16254	FLOAT VALVE
7	54-16255	CLIP
8	16253	FLOAT
9	17-16256	PIN
10	10-16257	SCREW
11	16258	FLOAT BOWL
12	25-16259	O-RING
13	10-16260	SCREW, (M4 x 12)
14	10-16261	SCREW, Drain
15	27-16262	GASKET
16	27-16326	GASKET
17	16325	DIAPHRAGM
18	16268	BODY, Pump
19	21-16269	CHECK VALVE
20	10-16270	SCREW
21	11-16271	NUT
22	16275	DIAPHRAGM
23	27-16274	GASKET
24	16272	COVER, Pump
25	855540	COVER, Carburetor
26	27-855541	GASKET
27	27-8555411	GASKET
28	10-855542	SCREW
29	10-162606	SCREW
30	10-812935	SCREW, Adjusting Comment: (5 H.P.)
31	24-16266	SPRING
32	10-16263	SCREW
33	24-16264	SPRING
34	10-16267	SCREW (USE WHERE APPLICABLE)
35	27-16327	GASKET
36	8M0207654	BRACKET
37	10-855809003	BOLT, (M6 x 85)
38	13-16818	LOCKWASHER
39	812936	PLATE, Baffle
40	10-16334	SCREW
41	12-16335	WASHER
42	16331	ROD, Choke Comment: ROUND DESIGN
43	25-16332	GROMMET Comment: ROUND DESIGN
44	8M0155123	ROD, Choke Comment: SQUARE DESIGN
45	827662	LINK, Choke Comment: SQUARE DESIGN
46	25-163321	GROMMET Comment: SQUARE DESIGN
47	16333	ROD, Snap

▶CLAMP AND SWIVEL BRACKETS (39 parts)

Ref	OEM Part #	Part Name
1	3406-8150301	CLAMP BRACKET Comment: (STBD.) - GRAY
2	3406-8150311	CLAMP BRACKET Comment: (PORT) - GRAY
3	10-898101337	BOLT
4	12-95375	WASHER
5	12-16192	WASHER
6	11-95374	NUT, (M8)
7	16193	DISTANCE PLATE
8	10-16194	SCREW
9	24-161951	SPRING Comment: SN# USA-0G574241/BEL-9973099 & Below
10	10-16196	SCREW
11	12-16197	WASHER
12	16198004	THRUST ROD
13	24-8150931	SPRING
14	10-815032	THUMB SCREW ASSEMBLY Comment: (GRAY)
15	12-95379	PAD
16	3407-815033T1	SWIVEL BRACKET Comment: (GRAY)
17	22-824969	FITTING, Grease
18	808599	CAP
19	10-16201	BOLT
20	12-16826	WASHER, Stainless Steel
21	23-8M0057473	BUSHING (UPPER)
22	23-8M0057474	BUSHING (LOWER) Comment: (SEE NOTE 1)
23	16204	THRUST PLATE
24	10-815034	SCREW, Adjusting Comment: (GRAY)
25	24-953838	SPRING
26	12-16826	WASHER, Stainless Steel
27	162051	FRICTION PLATE
28	8M0045584	STOP ASSEMBLY, Tilt
29	16208	GRIP
30	NLA	No Longer Available Comment: Bushing (ORDER 825112A2)
31	16210002	SET PLATE
32	10-95396	BOLT
33	13-400256	LOCKWASHER, (M6)
34	24-16212	SPRING
35	16213	ARM, Reverse Lock
36	24-16215	SPRING Comment: (RIGHT)
37	24-16216	SPRING Comment: (LEFT)
38	10-16223	BOLT
39	12-16826	WASHER, Stainless Steel

▶COWLING (23 parts)

Ref	OEM Part #	Part Name
1	2189-815039A2	TOP COWL ASSEMBLY Comment: (SILVER - 5)
2	25-162282	GROMMET Comment: SN# USA-0G574241/BEL-9973099 & Below
3	8M0130233	SEAL, Rubber
4	810780	BAFFLE, Sound
5	12-16826	WASHER, Stainless Steel
6	8150361	HOOK LEVER Comment: (GRAY)
7	26-16219	SEAL
8	23-16220	BUSHING
9	16222	COVER HOOK
10	10-8230427	BOLT
11	12-953921	WASHER, Stainless Steel
12	13-16221	WAVE WASHER
13	25-16231	GROMMET
14	25-16225	GROMMET
15	25-16226	GROMMET
16	91-16229	TOOL KIT
17	50-16230	SAFETY ROPE
18	19-18670	PLUG Comment: (GRAY 5 H.P.) (NOT USED W/DUAL FUEL SYSTEM)
19	815037	PLUG Comment: (NOT USED W/BLACK 5)
20	2189-815035A2	BOTTOM COWL Comment: (GRAY )
21	10-16832	BOLT, (M6 x 16)
22	37-855577A2	DECAL, EPA Label Information (INSIDE TOP COVER) Comment: (1998)
23	37-16227	DECAL, Fuel Cock (USE WHERE APPLICABLE)

▶CYLINDER BLOCK/CRANKSHAFT/PISTON (40 parts)

Ref	OEM Part #	Part Name
-	8M0145945	POWERHEAD ASSEMBLY Comment: (5HP) SN# USA-0G574241/BEL-9973099 & Below
1	878-815013A5	CYLINDER BLOCK Comment: SN# USA-0G574241/BEL-9973099 & Below
2	17-95218	PIN, Dowel Comment: SN# USA-0G574241/BEL-9973099 & Below
3	10-16695	BOLT
4	10-16696	BOLT
5	13-16818	LOCKWASHER
6	979-96301	CYLINDER HEAD
7	27-812939015	GASKET
8	10-16126	BOLT
9	12-4002217	WASHER
10	33-8M0114744	SPARK PLUG, (NGK#BP7HS-10) (WITHOUT RESISTANCE)
11	34-16706	REED VALVE
12	34-17666	STOP Comment: (5 H.P.)
13	10-16820	SCREW
14	8150162	HOUSING, Oil Seal Comment: SN# USA-0G574241/BEL-9973099 & Below
15	23-815017	BUSHING Comment: SN# USA-0G574241/BEL-9973099 & Below
16	26-8M0101649	SEAL, Oil
17	27-8M0152378	GASKET
18	10-16705	BOLT
19	13-400256	LOCKWASHER, (M6)
20	53-16057	CLIP
21	28-16053	KEY
22	30-16049	BEARING, Ball
23	8537122	THRUST PLATE
24	26-16051	SEAL, Oil
25	31-16052	BEARING, Roller
26	779-9616T	PISTON Comment: (.5MM O.S.)
27	39-8M0080356	RING, Piston Comment: (.5MM O.S.)
28	41-898101918	PIN, Piston
29	32-8M0057112	HOSE, (160 mm) Comment: USE WHERE APPLICABLE
30	21-42657A3	CHECK VALVE Comment: USE WHERE APPLICABLE
31	54-95224	CLIP
32	474-879147T15	CRANKSHAFT ASSEMBLY
33	463-813044	CRANKSHAFT
34	463-813045	CRANKSHAFT
35	813046	PIN, Crank
36	629-813047	CONNECTING ROD
37	31-813048	BEARING
38	23-815018	SPACER
39	32-823976	HOSE, Tell-Tale

▶DRIVESHAFT HOUSING/GEAR HOUSING (33 parts)

Ref	OEM Part #	Part Name
-	27-8M0188431	SEAL KIT, Gear Housing
1	1599-825137A1	HOUSING ASSEMBLY, Driveshaft Comment: (LONG) - GRAY
2	23-16114	BUSHING
3	10-16830	BOLT
4	12-16826	WASHER, Stainless Steel
5	19-879194296	PLUG, Water
6	27-95220	GASKET
7	27-812947001	GASKET
8	17-16119	PIN, Dowel
9	25-161181	GROMMET
10	25-16117	GROMMET
11	827663A1	HOUSING ASSEMBLY
12	16121	RETAINER
13	10-16123	SCREW, (25 mm) Comment: (LONG)
14	1668-9621A4	GEAR HOUSING ASSEMBLY Comment: (SAILMATE)
15	23-16124	BUSHING
16	97-823912	ANODE
17	10-16832	BOLT, (M6 x 16)
18	22-8M0229353	PLUG Comment: SN# USA-0G574241/BEL-9973099 & Below
19	27-95220	GASKET
20	10-8M0063198	BOLT (FRONT)
21	12-16826	WASHER, Stainless Steel
22	10-16126	BOLT (REAR)
23	12-16192	WASHER
24	16133	STRAINER, Water
25	10-16134	SCREW
26	30-16128	BEARING, Ball
27	30-16132	BEARING, Ball
28	26-16130	SEAL, Oil
29	25-16131	O-RING
30	825119T	HOUSING Comment: (GRAY
31	10-16832	BOLT, (M6 x 16)
32	12-16826	WASHER, Stainless Steel

▶FUEL TANK(SERIAL GROUP #1) (46 parts)

Ref	OEM Part #	Part Name
-	815596A2	FUEL TANK ADAPTOR KIT Comment: 5 H.P. BLACK
1	1258-824964A03	TANK ASSEMBLY, Fuel
2	36-8M0060029	CAP
3	36-812952	CAP Comment: (REFER TO DRAWING #1)
4	27-8M0065762	GASKET (USE WHERE APPLICABLE)
5	26-8M0099393	SEAL
6	16236	MOUNT
7	12-953921	WASHER, Stainless Steel
8	13-400256	LOCKWASHER, (M6)
9	11-400212	NUT, (M6) Stainless Steel
10	12-898101937	WASHER
11	8M0046049	BRACKET
12	10-16832	BOLT, (M6 x 16)
13	13-400256	LOCKWASHER, (M6)
14	22-16240	FUEL COCK ASSEMBLY Comment: 4 H.P. 22-815045A1 REPLACEMENT KIT
15	54-95395	CLIP, Stainless Steel Comment: 4 H.P. 22-815045A1 REPLACEMENT KIT
16	32-16246	HOSE Comment: 4 H.P. 22-815045A1 REPLACEMENT KIT
17	32-16242001	TUBE Comment: 4 H.P. 22-815045A1 REPLACEMENT KIT
18	16241	ROD Comment: 4 H.P. 22-815045A1 REPLACEMENT KIT
19	16244	RUBBER Comment: 4 H.P. 22-815045A1 REPLACEMENT KIT
20	16243	KNOB Comment: 4 H.P. 22-815045A1 REPLACEMENT KIT
21	10-16245	SCREW Comment: 4 H.P. 22-815045A1 REPLACEMENT KIT
22	32-16247	HOSE, (117 mm) Comment: 4 H.P. 22-815045A1 REPLACEMENT KIT
23	35-8M0157133	FILTER, Fuel Comment: 4 H.P. 22-815045A1 REPLACEMENT KIT
24	54-95395	CLIP, Stainless Steel Comment: 5 H.P. GRAY
25	35-8M0157133	FILTER, Fuel Comment: 5 H.P. GRAY
26	54-8M0130961	CLAMP Comment: 5 H.P. GRAY
27	32-17669	HOSE Comment: 5 H.P. GRAY
28	32-17668	HOSE Comment: 5 H.P. GRAY
29	22-8M0182334	CONNECTOR, Fuel - Brass Comment: 5 H.P. GRAY
30	10-4000333	SCREW, (M6 x 40) Comment: 5 H.P. GRAY
31	12-16826	WASHER, Stainless Steel Comment: 5 H.P. GRAY
32	54-95395	CLIP, Stainless Steel Comment: 5 H.P. BLACK
33	32-851848032	HOSE, Rubber (110 mm) Comment: 5 H.P. BLACK
34	35-8M0157133	FILTER, Fuel Comment: 5 H.P. BLACK
35	22-8M0182334	CONNECTOR, Fuel - Brass Comment: 5 H.P. BLACK
36	10-4000333	SCREW, (M6 x 40) Comment: 5 H.P. BLACK
37	12-16826	WASHER, Stainless Steel Comment: 5 H.P. BLACK
38	22-815043	REDUCER ELBOW Comment: 5 H.P. BLACK
39	56762	CLAMP, Plastic Comment: 5 H.P. BLACK
40	22-815045	FUEL COCK ASSEMBLY Comment: 5 H.P. BLACK
41	10-815046	SCREW, Stainless Steel Comment: 5 H.P. BLACK
42	32-8M0057113	HOSE, Rubber (30 mm) Comment: 5 H.P. BLACK
43	22-73318	TEE, Plastic Comment: 5 H.P. BLACK
44	32-8M0168427	HOSE, Rubber Comment: 5 H.P. BLACK
45	22-815048	CONNECTOR, Plastic Comment: 5 H.P. BLACK

▶FUEL TANK(SERIAL GROUP #2) (33 parts)

Ref	OEM Part #	Part Name
1	1258-824964A03	TANK ASSEMBLY, Fuel
2	36-8M0060029	CAP
3	26-8M0099393	SEAL Comment: SN# USA-0G574241/BEL-9973099 & Below
4	16236	MOUNT
5	12-953921	WASHER, Stainless Steel
6	13-400256	LOCKWASHER, (M6)
7	11-400212	NUT, (M6) Stainless Steel
8	12-898101937	WASHER
9	8M0046049	BRACKET
10	10-16832	BOLT, (M6 x 16)
11	13-400256	LOCKWASHER, (M6)
12	22-815043	REDUCER ELBOW
13	22-815045	FUEL COCK ASSEMBLY
14	10-815046	SCREW, Stainless Steel
15	56762	CLAMP, Plastic
16	32-8M0057113	HOSE, (80 mm) Comment: (Quantity of 3 required on 5HP)
17	35-8M0157133	FILTER, Fuel
18	54-95395	CLIP, Stainless Steel Comment: (Quantity of 11 required on 5HP)
19	22-73318	TEE, Plastic Comment: 5 H.P.
20	32-8M0168427	HOSE, Rubber Comment: 5 H.P.
21	22-815048	CONNECTOR, Plastic Comment: 5 H.P.
22	32-851848032	HOSE, Rubber (110 mm) Comment: 5 H.P.
23	22-8M0182334	CONNECTOR, Fuel - Brass Comment: 5 H.P.
24	10-4000333	SCREW, (M6 x 40) Comment: 5 H.P.
25	12-16826	WASHER, Stainless Steel Comment: 5 H.P.
26	22-8M0182334	CONNECTOR, Fuel - Brass Comment: 5 H.P.
27	10-4000333	SCREW, (M6 x 40) Comment: 5 H.P.
28	12-16826	WASHER, Stainless Steel Comment: 5 H.P.
29	54-95395	CLIP, Stainless Steel Comment: 5 H.P.
30	32-17668	HOSE Comment: 5 H.P.
31	54-8M0130961	CLAMP Comment: 5 H.P.
32	35-8M0157133	FILTER, Fuel Comment: 5 H.P.
33	32-17669	HOSE Comment: 5 H.P.

▶GEAR HOUSING COMPONENTS (44 parts)

Ref	OEM Part #	Part Name
-	8M0155395	REPAIR KIT, Water Pump
1	45-8M0076368	DRIVESHAFT Comment: (LONG)
2	30-95347	BEARING
3	28-16155	KEY
4	43-16138	GEAR
5	27-16164003	GASKET
6	15-8132761	SHIM (0.15) Comment: SN# USA-0G574241/BEL-9973099 & Below
7	26-16162	SEAL, Oil
8	46-826053T	HOUSING (LOWER)
9	16165	RETAINER
10	10-8M0204707	SCREW, (M6 x 25) Comment: USE WITH WASHER
11	12-16826	WASHER, Stainless Steel
12	27-16160004	GASKET
13	16159	PLATE
14	27-8M0155369	GASKET
15	47-8M0204676	IMPELLER
16	16157	LINER
17	46-16156	HOUSING, Upper Water Pump
18	10-8M0063198	BOLT
19	12-16826	WASHER, Stainless Steel
20	26-16168	SEAL
21	32-16167	HOSE
22	26-16171	SEAL
23	32-16170	TUBE, Water Comment: (LONG)
24	15-813277	SHIM, (0.15)
25	43-812944	GEAR
26	16152	FOLLOWER, Cam
27	16153	RETAINER
28	52-812946	CLUTCH
29	17-16150	PIN, Clutch
30	24-17667	SPRING
31	44-195133	PROPELLER SHAFT
32	12-16140	WASHER
33	43-8129451	GEAR, Reverse
34	16145Q01	THRUST HOLDER
35	48-812951A02	PROPELLER Comment: (6 PITCH - HI-REVERSE THRUST - SAILPOWER)
36	12-16146	WASHER
37	11-16147	PROP NUT
38	18-815026	COTTER PIN
39	25-18876	GROMMET Comment: USE WHERE APPLICABLE
40	23-810471	SPACER Comment: USE WHERE APPLICABLE
41	810753	GUIDE Comment: USE WHERE APPLICABLE
42	NLA	No Longer Available, Plate Comment: (ORDER REF. #34) USE WHERE APPLICABLE
43	23-815794	BUSHING Comment: USE WHERE APPLICABLE

▶MAGNETO AND IGNITION COMPONENTS (36 parts)

Ref	OEM Part #	Part Name
1	200-8M0110989	FLYWHEEL
2	16058T	COIL, Exciter
3	10-16059	SCREW
4	54-16060	CLAMP
5	10-16821	SCREW
6	11-16071	NUT
7	12-16072	WASHER
8	160661	COIL, Pulser
9	10-16067	SCREW
10	815113T02	COIL ASSEMBLY, Ignition
11	85-855543	BOOT, With Resistance
12	10-16065	BOLT
13	13-16818	LOCKWASHER
14	12-809931044	WASHER
15	25-16068	GROMMET
16	16061T04	CD UNIT
17	878061	DAMPER (FRONT)
18	878062	DAMPER (REAR)
19	18-815026	COTTER PIN
20	87-823037A04	SWITCH ASSEMBLY, Stop
21	16074T	ALTERNATOR Comment: SAILPOWER
22	10-16059	SCREW Comment: SAILPOWER
23	54-16060	CLAMP Comment: SAILPOWER
24	10-16821	SCREW Comment: SAILPOWER
25	16076A1	RECTIFIER Comment: SAILPOWER
26	89-16077	FUSE Comment: SAILPOWER
27	10-16078	SCREW Comment: SAILPOWER
28	13-16079	LOCKWASHER Comment: SAILPOWER
29	12-8M0108373	WASHER, Stainless Steel Comment: SAILPOWER
30	54-813275	CLAMP Comment: SAILPOWER
31	11-16081	NUT, Stainless Steel Comment: SAILPOWER
32	84-16822	HARNESS, Extension Comment: SAILPOWER
33	25-16823	GROMMET Comment: SAILPOWER
34	84-16082	CABLE, Battery Comment: SAILPOWER
35	87-823037A04	SWITCH ASSEMBLY, Emergency Stop
36	823054	LANYARD

▶MISCELLANEOUS INFORMATION (1 parts)

Ref	OEM Part #	Part Name
-	90-10102980	OWNERS MANUAL

▶RECOIL STARTER (30 parts)

Ref	OEM Part #	Part Name
-	803576T02	STARTER ASSEMBLY, Recoil
1	8M0227442	HOUSING, Starter
2	24-812645T	SPRING SET
3	812633	SHEEVE, Starter
4	24-812634	SPRING, Return
5	8M0060217	RATCHET
6	24-812636	SPRING, Friction
7	10-8M0060218	BOLT
8	812638	FRICTION PLATE
9	161101	PLATE, Seal Comment: SN# USA-0G574241/BEL-9973099 & Below
10	50-12066Q10	ROPE, Starter
11	812640	HANDLE, Starter Rope
12	812641	RETAINER
13	812642	PULLEY, Starter
14	10-16828	BOLT Comment: USE WITH LOCKWASHER
15	13-16818	LOCKWASHER
16	10-810755	SCREW
17	17634	LOCK, Starter
18	23-895130	COLLAR
19	24-812645007	SPRING
20	12-16335	WASHER
21	10-17635	SCREW
22	812643	CAM
23	8M0169412	SNAP, Link Rod Comment: SN# USA-0G574241/BEL-9973099 & Below
24	10-855544	SCREW Comment: USE WITH COLLAR
25	23-855545	COLLAR Comment: USE WITH COLLAR
26	13-17641	WAVE WASHER
27	10-17640	SHOULDER SCREW Comment: (USE WITHOUT COLLAR)
28	17642001	ROD
29	13-400256	LOCKWASHER, (M6)

▶REMOTE CONTROL ATTACHING KIT (37 parts)

Ref	OEM Part #	Part Name
1	16840A2	ATTACHING KIT, Remote Control
2	16848	LEVER
3	17034	WIRE, Throttle
4	10-8230427	BOLT Comment: (SEE NOTE 1)
5	13-400256	LOCKWASHER, (M6)
6	12-953921	WASHER, Stainless Steel Comment: (SEE NOTE 1)
7	23-16849	COLLAR Comment: (SEE NOTE 1)
8	84-17035	HARNESS ASSEMBLY (DUAL STOP SWITCH)
9	17-17031	PIN, Lock
10	17-17033	PIN
11	24-17032	SPRING
12	17030	SLEEVE
13	12-17029	WASHER
14	16847	LEVER, Throttle
15	17026	BRACKET
16	17027	CAP
17	24-17028	SPRING
18	13-16221	WAVE WASHER
19	26-16219	SEAL
20	23-16220	BUSHING
21	17023	BRACKET
22	10-16832	BOLT, (M6 x 16)
23	13-400256	LOCKWASHER, (M6)
24	11-400212	NUT, (M6) Stainless Steel
25	17024	PLATE, Steering Hook Comment: SN# USA-0G574241/BEL-9973099 & Below
26	10-4000354	SCREW, (M8 x 30)
27	12-16192	WASHER
28	13-17025	LOCKWASHER
29	11-400213	NUT, (M8) Stainless Steel
30	84-17162	HARNESS ASSEMBLY (5.9M)
31	25-16823	GROMMET
32	87-823037A2	SWITCH ASSEMBLY, Stop Comment: USE WHERE APPLICABLE
33	25-16226	GROMMET Comment: USE WHERE APPLICABLE
34	10-17174	BOLT Comment: USE WHERE APPLICABLE
35	12-8M0108373	WASHER, Stainless Steel Comment: USE WHERE APPLICABLE
36	54-17169	CLAMP Comment: USE WHERE APPLICABLE
37	11-16081	NUT, Stainless Steel Comment: USE WHERE APPLICABLE

▶SHIFT COMPONENTS (21 parts)

Ref	OEM Part #	Part Name
-	27-8M0188431	SEAL KIT, Gear Housing
1	8130275	LEVER, Shift
2	30-812937	STOPPER
3	24-813028	SPRING
4	16184	LEVER
5	10-16185	BOLT
6	17-16188	PIN
7	18-16189	COTTER PIN
8	25-16181	O-RING
9	16187	SHIFT ROD Comment: (LONG)
10	12-16826	WASHER, Stainless Steel
11	16190	JOINT
12	10-16832	BOLT, (M6 x 16)
13	12-16826	WASHER, Stainless Steel
14	8M0058365	CAM ROD Comment: (LONG)
15	17-16179	PIN
16	25-161771	O-RING
17	23-16176	BUSHING
18	25-16178	O-RING
19	8M0090459	CAM
20	17-16175	PIN

▶THROTTLE COMPONENTS (23 parts)

Ref	OEM Part #	Part Name
1	815027T1	HANDLE, Throttle Comment: (GRAY)
2	37-8M0097201	DECAL
3	16088	WIRE, Throttle
4	16093	SHAFT, Throttle
5	23-16336	BUSHING
6	23-16191	SPACER
7	813026	FRICTION PIECE
8	10-16087	SCREW, Adjusting
9	12-16826	WASHER, Stainless Steel
10	11-400212	NUT, (M6) Stainless Steel
11	16086	GRIP
12	10-16094	SCREW
13	16338	BRACKET
14	10-16827	SCREW
15	12-16826	WASHER, Stainless Steel (USE WHERE APPLICABLE)
16	23-16083005	BUSHING
17	17-16085	PIN
18	8M0207656	RETAINER
19	16-815028	STUD BOLT
20	13-400256	LOCKWASHER, (M6)
21	16089	BRACKET
22	10-168281	SCREW AND LOCKWASHER
23	13-16818	LOCKWASHER (USE WHERE APPLICABLE)

100-Hour / Annual Service Checklist

Regular maintenance keeps your Mercury 4/5 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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