– JLM Marine Boat Parts Limited

Mercury 400 (1279685 THRU 1476509) Parts & Diagrams

🔎 Mercury 400 Reference Library — Exploded parts diagrams (19 diagrams), specifications, common issues, and maintenance checklist.

The Mercury 400 is a 4-Stroke, V10 64-degree, Naturally Aspirated outboard motor. Commonly used on jon boats, pontoons, and mid-size utility craft.

Quick Reference Specifications

Specification	Value
Engine Type	4-Stroke, V10 64-degree, Naturally Aspirated
Horsepower	40 HP
Displacement	5700 cc (5.7L / 349 CID)
Bore x Stroke	92 mm x 86 mm (3.6 in. x 3.4 in.)
Spark Plug (Type & Gap)	NGK ILFR6G-E
Engine Oil Capacity	7.0 L (7.4 US qt) with filter
Recommended Engine Oil	Mercury FourStroke 25W-40
Gear Case Oil Capacity	970 mL (32.8 oz)
Idle Speed (in gear)	650–700 RPM (in gear)
Full Throttle RPM Range	5800-6400
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 400:

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 400.

▶BOTTOM COWL ASSEMBLY (55 parts)

Ref	OEM Part #	Part Name
-	21041	INSERT, TOP LOCK - BOTTOM COWL
--	53-25539	FASTNER, TRADE MARK PLATE TO BOTTOM COWL
1	103-2354A3	BOTTOM COWL ASSEMBLY
2	29206	COVER, PLUG - BOTTOM COWL HARNESS HOLE
3	10-45893	SCREW, PLUG COVER TO BOTTOM COWL
4	13-26995	LOCKWASHER, PLUG COVER FASTENING SCREW
5	11-26419	NUT, PLUG COVER FASTENING SCREW
6	23760	BAFFLE, BOTTOM COWL
7	10-21106	SCREW, BAFFLE TO BOTTOM COWL
8	29229A1	TRIM MOULDING ASSEMBLY (CHROME) Comment: INCLUDED WITH 103-1597A3 BOTTOM COWL ASSEMBLY
9	10-29226	SCREW, DECORATIVE - MOULDING TO BOTTOM COWL Comment: INCLUDED WITH 103-1597A3 BOTTOM COWL ASSEMBLY
10	12-24671	WASHER, FIBRE - MOULDING FASTENING SCREW Comment: INCLUDED WITH 103-1597A3 BOTTOM COWL ASSEMBLY
11	11-29225	NUT, NYLON CAP - MOULDING FASTENING SCREW Comment: INCLUDED WITH 103-1597A3 BOTTOM COWL ASSEMBLY
12	13-26995	LOCKWASHER, MOULDING FASTENING SCREW Comment: INCLUDED WITH 103-1597A3 BOTTOM COWL ASSEMBLY
13	11-26419	NUT, BRASS - MOULDING FASTENING SCREW Comment: INCLUDED WITH 103-1597A3 BOTTOM COWL ASSEMBLY
14	27-20390	GASKET, POWERHEAD TO BOTTOM COWL
15	30109	GROUND STRAP, CYLINDER BLOCK TO BOTTOM COWL
16	20557	BRACKET, CABLE END ANCHOR
17	10-29200	SCREW, ANCHOR BRACKET TO BOTTOM COWL
18	29532	LEVER, THROTTLE CONTROL
19	30612	LEVER, SHIFT CONTROL
20	23-29529	BUSHING, THROTTLE AND SHIFT LEVER
21	12-8M0042641	WASHER, THROTTLE AND SHIFT LEVER FASTENING SCREW
22	10-37612	SCREW, THROTTLE AND SHIFT LEVER FASTENING
23	17-30978A1	PIN ASSEMBLY, CLEVIS YOKE
24	17-239281	ROLL PIN, CLEVIS YOKE PIN
25	10-20584	SCREW, CLEVIS YOKE PIN TO LEVER
26	13-29402	WASHER, WAVE - CLEVIS PIN FASTENING SCREW
27	11-8M0204718	NUT, CLEVIS PIN FASTENING SCREW
28	25180	SHIFT SHAFT ASSEMBLY, UPPER
29	27714	ROD (SLEEVE), SHIFT CONTROL END
30	11-25168	NUT, ADJUSTING - SHIFT SHAFT END
31	25134	ROD, LINK - SHIFT SHAFT END
32	18-210711	COTTER PIN, LINK ROD TO SHIFT SHAFT
33	12-20583	WASHER, SHIFT CONTROL END ROD
34	24-25065	SPRING, DETENT - SHIFT SHAFT
35	10-98256	SCREW, DETENT SPRING TO BOTTOM COWL
36	12-69057	WASHER, DETENT SPRING SCREW
37	11-8M0207775	NUT, DETENT SPRING FASTENING SCREW
38	32-8M0108355	TUBE, VENT - MAGNETO OUTLET (10 1/2")
39	22-996642	ELBOW, MAGNETO VENT TUBE
40	22-291112	NIPPLE, MAGNETO - VENT TUBE
41	21104A2	CONNECTOR BASE ASSEMBLY
42	13-21972	LOCKWASHER, CONNECTRO BASE
43	11-21971	NUT, CONNECTOR BASE TO BOTTOM COWL
44	54-25231	CLIP, CONNECTOR BASE LEAD WIRE
45	10-21106	SCREW, LEAD WIRE CLIP TO BOTTOM COWL
46	30999	BRACKET, LOCK KNOB - COWL FRONT COVER
47	10-21091	SCREW, BRACKET TO BOTTOM COWL (1 1/8")
48	10-56500	SCREW, BRACKET TO BOTTOM COWL (1 1/4")
49	11-8M0207775	NUT, BRACKET FASTENING SCREW
50	26552	SUPPORT, EXTERNAL WIRING HARNESS
51	10-20639	SCREW, HARNESS SUPPORT TO BOTTOM COWL
52	12-20084	WASHER, HARNESS SUPPORT FASTENING SCREW
53	11-29250	NUT, HARNESS SUPPORT FASTENING SCREW

▶CARBURETOR ASSEMBLY (43 parts)

Ref	OEM Part #	Part Name
--	1399-1712	REPAIR PARTS KIT (1 PER CARBURETOR)
1	1333-1700	CARBURETOR ASSEMBLY, COMPLETE (KA-9A) Comment: SERIAL )1307411-09999999
2	1399-1470	SHUTTER, CHOKE
3	10-23035	SCREW AND LOCKWASHER, CHOKE SHUTTER
4	1399-1713	SCREW, IDLE ADJUSTMENT
5	24-27160	SPRING, IDLE ADJUSTMENT SCREW
6	1399-1469	CHOKE SHAFT AND LEVER
7	54-28407	CLIP, CHOKE SHAFT RETAINING
8	10-28408	SCREW, RETAINING CLIP TO LOWER CARBURETOR
9	13-26995	LOCKWASHER, RETAINING CLIP SCREW
10	1395-8673	FLOAT ASSEMBLY
11	1399-102	LEVER, FLOAT (LOWER)
12	1399-101	LEVER, FLOAT (UPPER)
13	17-20853	PIN, FLOAT LEVER PINION
14	1395-92581	INLET NEEDLE, SEAT AND GASKET
15	27-25033	GASKET, INLET SEAT
16	1399-99	GASKET, FLOAT BOWL COVER
17	1399-1133	COVER, FLOAT BOWL
18	10-22625	SCREW, FLOAT BOWL COVER (SHORT)
19	10-25850	SCREW, FLOAT BOWL COVER (LONG)
20	27-25851	GASKET, STRAINER COVER (LARGE)
21	1399-3938	SCREEN, FILTER
22	27-25849	GASKET, STRAINER COVER (SMALL)
23	1399-1135	COVER, STRAINER
24	27-25848	GASKET, STRAINER COVER SCREW
25	10-25822	SCREW, STRAINER COVER FASTENING
26	8146791	LEVER, THROTTLE STOP (SEE NOTE BELOW)
27	1395-6027	SCREW, THROTTLE STOP LEVER
28	1399-1710	TUBE, IDLE
29	27-23180	GASKET, IDLE TUBE
30	1399-2012	SHAFT, THROTTLE
31	24-26890	SPRING, THROTTLE SHAFT RETURN (LOWER CARBURETOR)
32	1399-1711	SHUTTER, THROTTLE
33	10-23035	SCREW AND LOCKWASHER, THROTTLE SHUTTER
34	19-20011	WELCH PLUG, BODY CHANNEL
35	1399-1474	NOZZLE, MIAN
36	10-23178	SCREW, PLUG - MAIN NOZZLE
37	1399-1467	JET, MAIN FUEL (.067(
38	27-28409	GASKET, MAIN FUEL JET
39	10-28405	SCREW, PLUG - BODY CHANNEL
40	27-28406	GASKET, BODY CHANNEL PLUG SCREW
41	27-757911	GASKET, CARBURETOR FLANGE
42	11-29250	NUT, CARBURETOR MOUNTING STUD

▶CARBURETOR LINKAGE AND CHOKE SOLENOID (41 parts)

Ref	OEM Part #	Part Name
1	31593	CHOKE SOLENOID, TOP COWL
2	22647	DISCONNECT, KNIFE SPLICE - CHOKE SOLENOID
3	10-20540	SCREW, CHOKE SOLENOID TO TOP COWL
4	13-26992	LOCKWASHER, CHOKE SOLENOID SCREW
5	10-24773	SCREW, CHOKE SOLENOID TO TOP COWL
6	13-26991	LOCKWASHER, CHOKE SOLENOID SCREW
7	26716A1	GROUND STRAP ASSEMBLY, CHOKE SOLENOID TO ADAPTOR
8	32-26693A1	SLEEVE, CHOKE SOLENOID WIRE AND HARNESS WIRE
9	54-24836	CLAMP, CHOKE WIRE TO STARTER SOLENOID
10	8M0084613	"D" WASHER, CHOKE WIRE CLAMP
11	27031A1	PLUNGER ASSEMBLY, CHOKE SOLENOID
12	27710	ADAPTOR PLATE, CHOKE PLUNGER
13	25-26633	GROMMET, ADAPTOR PLATE
14	10-20055	SCREW, ADAPTOR PLATE TO CHOKE ROD BRACKET
15	13-26996	LOCKWASHER, ADAPTOR PLATE FASTENING SCREW
16	12-26014	WASHER, ADAPTOR PLATE FASTENING SCREW
17	12-26014	WASHER, CHOKE SOLENOID LINK
18	18-26953	COTTER PIN, CHOKE SOLENOID LINK FASTENING
19	1333-1700	CARBURETOR ASSEMBLY, COMPLETE Comment: SERIAL 01307411-09999999
20	27917	CLUSTER, THROTTLE LEVER (UPPER CARBURETOR)
21	1395-6027	SCREW, SET - CLUSTER TO THROTTLE LEVER
22	90242A1	KNOB, CHOKE ROD
23	25-20116	GROMMET, CHOKE ROD
24	22462	"U" LINK, CHOKE KNOB TO CHOKE ROD
25	10-69022	SCREW, "U" LINK TO CHOKE KNOB
26	13-26996	LOCKWASHER, "U" LINK FASTENING SCREW
27	18-26953	COTTER PIN, CHOKE LEVER AND ROD FASTENING
28	28977	CHOKE ROD - UPPER
28A	28972A1	CHOKE ROD AND BRACKET ASSEMBLY - UPPER
29	27918	CHOKE ROD - LOWER
30	10-30096	SCREW, UPPER CHOKE ROD TO LOWER CHOKE ROD
31	12-27882	WASHER, UPPER CHOKE ROD FASTENING SCREW
32	17-25391	RIVET, CHOKE ROD TO THROTTLE SHAFT
33	24-28965	SPRING, CHOKE ROD TO RETAINER
34	27711	RETAINER, CHOKE ROD SPRING
35	10-28713	SCREW, RETAINER TO LOWER CARBURETOR
36	27870	CLAMP, THROTTLE PICKUP BRACKET
37	10-69022	SCREW, CLAMP TO THROTTLE PICKUP BRACKET
38	12-30164	WAHSER, THROTTLE PICKUP BRACKET CLAMPING SCREW
39	28007A1	BRACKET ASSEMBLY, THROTTLE PICKUP
40	10-29239	SCREW, THROTTLE BRACKET MOUNTING

▶CLAMP AND SWIVEL BRACKET (50 parts)

Ref	OEM Part #	Part Name
1	1440-1466A1	CLAMP BRACKET ASSEMBLY (SEE NOTE (1) BELOW)
2	28403A3	THUMB SCREW ASSEMBLY
3	12-28404	WASHER, THUMB SCREW
4	28122	TUBE, TILT - CLAMP BRACKET TO SWIVEL BRACKET
5	15-25600	SHIM, CLAMP BRACKET TO SWIVEL BRACKET
6	11-8M2014641	NUT, TILT TUBE
7	25606	CAP, PLASTIC - TILT TUBE
8	16-59625	STUD, CLAMP BRACKET
9	23-59624	SPACER, CLAMP BRACKET STUD
10	13-8M0204647	LOCKWASHER, CLAMP BRACKET STUD
11	11-22053	NUT, CLAMP BRACKET STUD
12	17-8M0026068	TILT LOCK PIN ASSEMBLY
13	32-28052	SLEEVE, RUBBER - TILT LOCK PIN BUMPER
14	30200A1	TILT STOP LEVER ASSEMBLY
15	10-28339	SCREW, TILT STOP LEVER ANCHOR
16	13-20846	WASHER, WAVE - LEVER ANCHOR SCREW
17	11-24652	NUT, LEVER ANCHOR SCREW
18	26903A3	REVERSE LOCK ASSEMBLY
19	18-45882	COTTER PIN, REVERSE LOCK TO SHAFT
20	24-29821	SPRING, REVERSE LOCK TENSION
21	17-25598	PIN, REVERSE LOCK SPRING ATTACHING
22	56349	SHAFT, REVERSE LOCK TO SWIVEL BRACKET
23	1444-1801A1	SWIVEL BRACKET ASSEMBLY
24	22-69059	FITTING, GREASE - SWIVEL BRACKET
25	26-32911	OIL SEAL (2 OIL SEALS REQUIRED ON LATER PRODUCTION ENGINES)
26	19-77633Q	LUBRICAP, SWIVEL BRACKET GREASE FITTING
27	55-28415	PIN, UPPER SHOCK MOUNTING
28	23-28024	SPACER, UPPER BUSHING TO CLAMP BRACKET
29	12-28025	WASHER, UPPER BUSHING RETAINER (INNER)
30	12-28420	WAHSER, UPPER BUSHING RETAINER (OUTER)
31	10-28449	BOLT, NYLOCK - UPPER SHOCK MOUNTING PIN
32	55-28413	LOWER SHOCK MOUNTING
33	23-28032	SPACER, LOWER BUSHING TO SWIVEL BRACKET
34	12-28420	WASHER, LOWER BUSHING RETAINER (OUTER)
35	10-28449	BOLT, NYLOCK - LOWER SHOCK MOUNTING PIN
36	55-28054	SHOCK ABSORBER
37	23-28055	BUSHING, RUBBER - SHOCK ABSORBER
38	17-28418A4	SWIVEL PIN AND TOP YOKE ASSEMBLY Comment: SERIAL 00000000-01363346
39	11-71956	NUT, SWIVEL PIN RETAINING
40	17-28418A4	SWIVEL PIN AND TOP YOKE ASSEMBLY Comment: SERIAL 01363347-09999999
41	10-33986	BOLT, UPPER MOUNTS TO SWIVEL PIN
42	30711	BUMPER, TOP YOKE
43	30711	BUMPER, TOP YOKE
44	30462A1	BOTTOM YOKE ASSEMBLY Comment: SERIAL 01365072-09999999
45	12-25176	WASHER, SWIVEL PIN TO BOTTOM YOKE
46	38-29534	SERIAL PLATE
47	10-25612	SCREW, DRIVE - SERIAL PLATE TO SWIVEL BRACKET
48	10-68298	BOLT, CARRIAGE - CLAMP BRACKET TO BOAT TRANSOM
49	12-68410	WAHER, CARRIAGE BOLT
50	11-82670912	NUT, CARRIAGE BOLT

▶COWLING AND FRONT COVER (22 parts)

Ref	OEM Part #	Part Name
--	92-86166Q1	GLUE, ADHESIVE - BLANKET FASTENING
1	2104-2654A5	COWL FRONT COVER ASSEMBLY
2	26183A5	EMBLEM, FRONT COVER
3	10-29226	SCREW, BRACKET TO FRONT COVER
4	13-26995	LOCKWASHER, BRACKET FASTENING SCREW
5	11-26419	NUT, BRACKET FASTENING SCREW
6	29345	BUMPER, RUBBER - FRONT COVER BRACKET
7	10-29552	SCREW, COVER FASTENING
7A	56848	KNOB, COWL FRONT COVER FASTENING
8	12-26702	WASHER, COVER FASTENING KNOB (NYLON)
9	12-26825	WASHER, COVER FASTENING KNOB (STEEL)
10	24-30772	SPRING, TENSION - FASTENING KNOB
11	17-29077	ROLL PIN, TENSION SPRING TO KNOB
12	29343	BLANKET, SOUND ABSORBING - FRONT COVER
12A	31095	STRIP, RUBBER - COWL FRONT COVER
13	2106-2353A2	WRAP AROUND COWL ASSEMBLY Comment: ORDER CORRECT REPLACEMENT HANDLE, SWIVEL OR HOOK ACCORDING TO THEIR SIZE (#8 OR #10). BOTH SIZES WERE USED
14	10,46785A1	HANDLE, COWL LATCH
15	53-21058	"E" RING, COWL LATCH HINGE PIN
16	17-21057	PIN, HINGE - COWL LATCH HANDLE
17	10,46785A1	SWIVEL, COWL LATCH
18	10,30413	HOOK, COWL LATCH FASTENING
19	24825	BLANKET, SOUND ABSORBING - WRAP AROUND COWL

▶CRANKSHAFT, PISTON AND CONNECTING ROD (29 parts)

Ref	OEM Part #	Part Name
--	39-28616A12	RING, PISTON (.015)
1	11-8M0214915	NUT, FLYWHEEL
2	12-26617	WASHER, FLYWHEEL NUT
3	28-20094	KEY, FLYWHEEL DRIVE
4	400-2976A2	CRANKSHAFT Comment: SERIAL 01365968-09999999
5	25-29619	"O" RING, DRIVE SHAFT SPLINE
6	500-5345A4	CENTER MAIN BEARING ASSEMBLY
7	17-20032	DOWEL PIN, CENTER MAIN BEARING
8	29-20046T	BEARING, NEEDLE
9	20047	RACE, OUTER
10	53-20048	RING, SNAP - OUTER RACE CLAMPING
11	10-28666	SCREW, CENTER MAIN BEARING CLAMPING
12	17-20379	DOWEL PIN (STEPPED)
13	527-1619A4	MAIN BEARING ASSEMBLY (VALVE TYPE)
14	17-20032	DOWEL PIN, MAIN BEARING
15	10-26184	SCREW, MAIN BEARING CLAMPING
16	34-88498A1	REED SET, MATCHED - MAIN BEARING
17	34-20053	REED STOP, MAIN BEARING REED VALVES
18	12-26014	WASHER, REED STOP MOUNTING SCREW
19	10-77280	SCREW, REED STOP MOUNTING
20	724-2537A2	PISTON AND PISTON PIN ASSEMBLY
21	40-20057	LOCK RING, PISTON PIN
22	39-27841A12	RING, PISTON
23	600-2748A2	CONNECTING ROD AND CAP ASSEMBLY (SEE NOTE BELOW)
24	10-45379	SCREW, CAP TO CONNECTING ROD
25	11-20061	NUT, CONNECTING ROD SCREW
26	29-20046T	BEARING, NEEDLE - CRANKPIN
27	29-20063	BEARING, NEEDLE - PISTON PIN
28	12-28121	WASHER, NEEDLE LOCATING

▶CYLINDER BLOCK AND CRANKCASE ASSEMBLY (56 parts)

Ref	OEM Part #	Part Name
1	1100-339A1	END CAP ASSEMBLY, UPPER
2	26-41953	OIL SEAL
3	25-20081	"O" RING, UPPER END CAP
4	30-63742T	BALL BEARING, UPPER END CAP
5	15-20082A1	SHIM, UPPER END CAP TO CRANKCASE AND BLOCK (.002-3-5-10)
6	10-29198	SCREW, UPPER END CAP MOUNTING
7	831-2414A2	CYLINDER BLOCK AND CRANKCASE ASSEMBLY (SEE NOTE BELOW)
8	23-26348	BUSHING, CRANKCASE
9	17-20032	DOWEL PIN, CYLINDER BLOCK TO MAIN BEARING
10	17-20323	DOWEL PIN, CYLINDER BLOCK TO CENTER MAIN BEARING
11	22-328022	PLUG, PIPE - WATER PRESSURE HOLE
12	16-21831	STUD, CARBURETOR MOUNTING (1 1/4")
13	16-33111	STUD, CRANKCASE TO DRIVE SHAFT HOUSING (1 5/8")
14	17-43044	DOWEL PIN, CRANKCASE TO CYLINDER BLOCK
15	16-8M0034463	STUD, CYLINDER BLOCK TO DRIVE SHAFT HOUSING (3 7/16")
16	16-29989	STUD, CYLINDER BLOCK TO DRIVE SHAFT HOUSING (1 15/16")
17	22-390721	PLUG, PIPE - UPPER OR LOWER BLEED HOLE
18	10-78841	SCREW, CRANKCASE TO CYLINDER BLOCK (1 1/2")
19	10-22039	SCREW, CRANKCASE TO CYLINDER BLOCK (2 3/4")
20	12-20084	WASHER, CRANKCASE SCREW
21	11-29250	NUT, CRANKCASE FASTENING SCREW
22	10-98260	SCREW, MAIN BEARING LOCKING
23	14-20091	TAB WASHER, BEARING LOCKING SCREW
24	10-20359	SCREW, CENTER MAIN BEARING LOCKING
25	1102-4181A3	END CAP ASSEMBLY, LOWER
26	21-28481A1	CHECK VALVE ASSEMBLY, LOWER END CAP
27	26-29477	OIL SEAL, LOWER
28	26-41953	OIL SEAL, UPPER
29	25-20081	"O" RING, LOWER END CAP
30	30-63742T	BALL BEARING, LOWER END CAP
31	15-20085A1	SHIM, LOWER END CAP TO CRANKCASE AND BLOCK (.002-3-5-10)
32	10-29198	SCREW, LOWER END CAP MOUNTING
33	27-26923	GASKET, MANIFOLD PLATE TO EXHAUST COVER
34	26922	PLATE, EXHAUST MANIFOLD
35	28240	COVER, EXHAUST MANIFOLD
36	10-28666	SCREW, MANIFOLD COVER AND HIGH TENSION LEAD CLIP MOUNTING
37	12-20028	WASHER, MANIFOLD COVER AND HIGH TENSION LEAD CLIP SCREWS
38	58124A1	SWITCH, MERCURY EXHAUST MANIFOLD COVER
39	54-22875	CLAMP, MERCURY SWITCH TO MANIFOLD COVER
40	10-20401	SCREW, MERCURY SWITCH CLAMP FASTENING
41	8M0084613	"D" WASHER, CLAMP AND CLIP FASTENING SCREW
42	54-25231	CLIP, MERCURY SWITCH LEAD WIRE TO MAGNETO
43	10-20401	SCREW, LEAD WIRE CLIP FASTENING
44	27-22333	GASKET, CYLINDER BLOCK COVER
45	1000-1A1	CYLINDER BLOCK COVER ASSEMBLY (SEE NOTE BELOW)
46	23-26348	BUSHING, CYLINDER BLOCK COVER
47	10-20653	SCREW, CYLINDER BLOCK COVER MOUNTING
48	11-24652	NUT, COVER MOUNTING SCREW
49	27-279361	GASKET, TRANSFER PORT COVER
50	27935	COVER, TRANSFER PORT
51	10-20540	SCREW, TRANSFER PORT COVER MOUNTING
52	22-62365A1	CHECK VALVE ASSEMBLY, BLEED HOSE (UPPER)
53	21-28481A1	CHECK VALVE ASSEMBLY, BLEED HOSE VALVE
54	32-9912688	HOSE, CYLINDER BLEED (6 1/2")
55	22-67902	CONNECTOR, CYLINDER BLEED HOSE (LOWER(
56	54-20387	CLAMP, BLEED HOSE TO CHECK VALVE AND CONNECTOR

▶DRIVE SHAFT HOUSING ASSEMBLY (41 parts)

Ref	OEM Part #	Part Name
1	1522-1567	DRIVE SHAFT HOUSING
2	32-25187	TUBE, WATER INLET
3	25-24961	RING, RUBBER - WATER INLET TUBE
4	26-25192	SEAL, WATER INLET TUBE
5	23-23651	SLEEVE, WATER INLET TUBE
6	24945	BAFFLE, EXHAUST RELIEF
7	10-25255	SCREW, BAFFLE TO DRIVE SHAFT HOUSING
8	27-24899	GASKET, DRIVE SHAFT HOUSING TO BOTTOM COWL
9	11-862902	NUT, POWERHEAD STUDS
10	10-25093	SCREW, GEAR HOUSING TO DRIVE SHAFT HOUSING
11	16-29103	STUD, DRIVE SHAFT HOUSING TO GEAR HOUSING
12	11-8M0204653	NUT, GEAR HOUSING AND DRIVE SHAFT HOUSING STUDS
13	28470	ROD, PUSH - REVERSE LOCK
14	17-24887	PIN, REVERSE LOCK LEVER
15	18-25191	COTTER PIN, PUSH ROD
16	24-25122	SPRING, TENSION - PUSH ROD
17	52920	LEVER, REVERSE LOCK
18	24926A1	MOUNT, RUBBER - UPPER
19	79680A1	COVER, UPPER MOUNT - OUTSIDE HALF
20	79680A1	COVER, UPPER MOUNT - INSIDE HALF
21	24929	PACKING, "U" CUP
22	12-24889	WASHER, UPPER MOUNT STUD (17/32 ID)
23	12-24891	WASHER, RUBBER - UPPER MOUNT STUD
24	23-30474	SPACER, UPPER MOUNT STUD Comment: SERIAL 01363347-09999999
25	12-11367	WASHER, UPPER MOUNT STUD (25/64 ID) Comment: SERIAL 01363347-09999999
26	11-23161	NUT, UPPER MOUNT STUD
27	25305	CAP, RUBBER - UPPER MOUNT
28	10-28772	SCREW, UPPER MOUNT COVER (1 1/2")
29	10-29389	SCREW, UPPER MOUNT COVER (1 7/8")
30	12-8M0204649	WASHER, MOUNTING COVER SCREW
31	11-35888	NUT, MOUNTING COVER SCREW
32	75304T1	MOUNT, RUBBER - LOWER
33	12-28053	WASHER, RUBBER - LOWER MOUNT
34	12-28051	WASHER, LOWER MOUNT
35	12-30119	WASHER, MOUNTING SCREW (1/8") Comment: USE WITH 30133A1 AND 30462A1 BOTTOM YOKE)
36	11-25096	NUT, MOUNTING SCREW
37	10-75284	SCREW, LOWER MOUNT (5 1/2") Comment: SERIAL 01365073-09999999
38	25067	BUMPER, RUBBER - MOUNTING SCREW
39	28242	COVER, LOWER MOUNT (STARBOARD SIDE)
40	10-29256	SCREW, LOWER MOUNT COVER FASTENING
41	22-390721	PLUG, GREASE - REVERSE LOCK HOLE

▶FLYWHEEL ASSEMBLY AND STATOR (18 parts)

Ref	OEM Part #	Part Name
1	11-8M0214915	NUT, FLYWHEEL
2	12-26617	WASHER, FLYWHEEL NUT
3	28-20094	KEY, FLYWHEEL DRIVE
4	215-3289A1	FLYWHEEL ASSEMBLY
5	29788	FLANGE, FLYWHEEL PULLEY (SEE NOTE BELOW)
5A	12-25293	WASHER, PULLY TO FLYWHEEL (SEE NOTE BELOW)
6	30306	PULLEY, FLYWHEEL
6A	22823	PULLEY, FLYWHEEL
7	29787	HUB, FLANGE - FLYWHEEL PULLEY
8	17-26618	DOWEL PIN, FLYWHEEL PULLEY
9	50-25263	RATCHET, FLYWHEEL
10	10-29238	SCREW, RATCHET TO FLYWHEEL
11	398-1455	STATOR, ALTERNATOR - FLYWHEEL
12	22647	DISCONNECT, KNIFE SPLICE - STATOR LEAD WIRE
13	32-26693A1	SLEEVE, RUBBER - STATOR LEAD WIRE
14	10-68918	SCREW, STATOR TO UPPER END CAP
15	54-24836	CLIP, STATOR LEAD TO CRANKCASE FLANGE
16	10-8M0113176	SCREW, STATOR LEAD CLIP FASTENING

▶FUEL PUMP ASSEMBLY (30 parts)

Ref	OEM Part #	Part Name
-	22-390721	PLUG, PIPE - FUEL PUMP
--	32-30040	FUEL LINE, UPPER TO LOWER FILTER Comment: USE WITH 29178A2 FUEL PUMP
1	30269A2	FUEL PUMP ASSEMBLY Comment: SERIAL 01362198-09999999
2	27-23005	GASKET, CHECK VALVE TO HOUSING
3	21-8M0082362	VALVE, CHECK
4	23004	RETAINER, CHECK VALVE
5	10-43725	SCREW, RETAINER TO HOUSING
6	27-24863	GASKET, FUEL PUMP
7	23014	DIAPHRAGM, FUEL PUMP
8	23008	COVER, FUEL PUMP
9	27-30276	GASKET, FUEL PUMP COVER
10	10-29126	SCREW, FUEL PUMP MOUNTING (1 3/4")
11	10-29029	SCREW, FUEL PUMP MOUNTING (1 1/2")
12	22-22949	CONNECTOR, PUMP INLET TO FUEL LINE
13	22-22946	SLEEVE, RUBBER - CONNECTOR
14	22-22948	NUT, CONNECTOR TO FUELK LINE
15	32-30035	FUEL LINE, FUEL PUMP TO LOWER FILTER
16	22-22995	ELBOW, FUEL PUMP INLET
17	22-22946	SLEEVE, RUBBER
18	22-22948	NUT, ELBOW
19	32-30036	FUEL LINE, FUEL PUMP TO ADAPTOR
20	22833	ADAPTOR, CHECK UNIT (FUEL LINE)
21	23069	STEM, CHECK UNIT ADAPTOR
22	25-16524	"O" RING, ADAPTOR STEM
23	24-23067T	SPRING, ADAPTOR STEM
24	30188	CUP WASHER, ADAPTOR
25	10-20784	SCREW, ADAPTOR TO BOTTOM COWL
26	11-24652	NUT, ADAPTOR SCREW
27	32-38527	FUEL LINE, UPPER TO LOWER FILTER Comment: (USE WITH 30269A2 FUEL PUMP
28	22-25956	TEE ASSEMBLY, LOWER FILTER Comment: (USE WITH 30269A2 FUEL PUMP

▶GEAR HOUSING ASSEMBLY, COMPLETE(PAGE 1) (38 parts)

Ref	OEM Part #	Part Name
-	27-31367	GASKET, WATER INTAKE SCREEN TO HOUSING
1	1603-1868A4	GEAR HOUSING ASSEMBLY
2	16-8M0133358	STUD, GEAR HOUSING TO DRIVE SHAFT HOUSING
3	31-62091T	BEARING, ROLLER - DRIVE SHAFT
4	23-23651	SLEEVE, WATER INLET TUBE
5	32-23652	TUBE, WATER INLET - LOWER
6	26-20232	SEAL, WATER TUBE
7	35-23654	SCREEN, WATER INTAKE - GEAR HOUSING
8	10-79953Q04	SCREW, GREASE FILLER AND FLUSHING HOLE
9	12-191833	WASHER, GREASE FILLER AND FLUSHING HOLE SCREW
10	10-28653	SCREW, GEAR HOUSING VENT
11	19643	WASHER, GEAR HOUSING VENT SCREW
12	25136	SHAFT, SHIFT - LOWER
13	53-29641	CLIP, RETAINING - SHIFT SHAFT
14	25-25439	"O" RING, SHAFT SHAFT BUSHING
15	23-46284A1	BUSHING ASSEMBLY, SHIFT SHAFT
16	26-892361	OIL SEAL
17	52918	CAM, LOWER - REVERSE LOCKING
18	52919	CAM, UPPER - REVERSE
19	45-29617A1	DRIVE SHAFT ASSEMBLY
20	53-29116	RING, RETAINING - BALL BEARING
21	43-20834	GEAR, PINION
22	14-29163	TAB WASHER, PINION GEAR SCREW
23	10-20925	SCREW, PINION GEAR TO DRIVE SHAFT
24	15-20929A1	SHIM, DRIVE SHAFT BEARING TO HOUSING
25	30-72961	BEARING, BALL - DRIVE SHAFT
26	25-26722	"O" RING, WATER PUMP CARTRIDGE
27	46-29117A1	WATER PUMP CARTRIDGE ASSEMLBY
28	26-90562	OIL SEAL
29	28091	INSERT, WATER PUMP CARTRIDGE
30	28-28657	KEY, WATER PUMP CARTRIDGE
31	47-89983T	IMPELLER, WATER PUMP
32	28-8M0032837	PIN, IMPELLER DRIVE
33	20272	PLATE, OUTLET - WATER PUMP COVER
34	20270A2	WATER PUMP COVER ASSEMBLY
35	26-23517	OIL SEAL
36	25-20273	RING, RUBBER - CENTRIFUGAL SLINGER
37	25-29619	"O" RING, UPPER - DRIVE SHAFT

▶GEAR HOUSING ASSEMBLY, COMPLETE(PAGE 2) (29 parts)

Ref	OEM Part #	Part Name
-	1603-1868A2	GEAR HOUSING ASSEMBLY, COMPLETE - SEE NOTE BELOW
1	1603-1868A4	GEAR HOUSING ASSEMBLY (SEE PAGE 13 FOR PARTS BREAKDOWN)
38	760394	CAM, SHIFT
39	20930	FOLLOWER, CAM
40	20843	SLIDE, CROSS PIN
41	24-20254	SPRING, CAM FOLLOWER PIN
42	15-20928A1	SHIM, BALL BEARING TO GEAR HOUSING
43	30-20840	BEARING, BALL - FORWARD GEAR
44	43-20975A5	FORWARD GEAR ASSEMBLY
45	31-20249	BEARING, ROLLER - FORWARD GEAR
46	52-32189	RATCHET, SLIDING CLUTCH
47	17-20841	PIN, CROSS - RATCHET TO PROPELLER SHAFT
48	53-20842	RING, RETAINING - CROSS PIN
49	44-25254	SHAFT, PROPELLER
50	43-20975A5	REVERSE GEAR ASSEMBLY
51	20864	RING, ADAPTOR - BALL BEARING
52	30-20839T	BEARING, BALL - REVERSE GEAR
53	15-20927A1	SHIM, ADAPTOR RING TO GEAR HOUSING
54	20862A1	BEARING CARRIER ASSEMBLY
55	31-20249	BEARING, ROLLER
56	26-90562	OIL SEAL
57	25-20863	"O" RING, BEARING CARRIER
58	12-22970	WASHER, GEAR HOUSING COVER
59	20865	COVER, GEAR HOUSING
60	12-25251	WASHER, BACKING (1/8)
61	48-22914A2	PROPELLER ASSEMBLY (2 BLADE - ALUMINUM
62	12-25252	WASHER, BACKING (1/32)
63	14-25250	TAB WASHER, PROPELLER NUT
64	11-29825	NUT, PROPELLER (NYLON)

▶MAGNETO ADAPTOR AND PILOT ASSEMBLY (61 parts)

Ref	OEM Part #	Part Name
-	29321A7	MAGNETO ADAPTOR AND PILOT ASSEMBLY, COMPLETE
--	20136	FLANGE, DRIVEN PULLEY (OLD STYLE)
1	394-2271A2	MAGNETO ASSEMBLY, COMPLETE (4D-3)
2	45-27951	SHAFT, MAGNETO DRIVE
3	39560A1	MAGNETO PILOT ASSEMBLY
4	30-20066	BEARING, BALL - MAGNETO PILOT
5	24-27944	SPRING, HORSESHOE - MAGNETO PILOT
6	17-27962	PIN, ANCHOR - HORSESHOE SPRING TO PILOT
7	12-8M0204649	WASHER, HORSESHOE SPRING TO ANCHOR PIN
8	27946A1	ECONOMISER COLLAR AND PIN ASSEMBLY
9	17-27961	PIN, ECONOMISER COLLAR - SPRING RETAINER
10	22-25094	FITTING, GREASE - ECONOMISER COLLAR
11	38230A1	THROTTLE ACTUATOR ASSEMBLY
12	23-26602	BUSHING, NYLON - THROTTLE ACTUATOR
13	10-20665	SCREW, THROTTLE ACTUATOR TO ECONOMISER COLLAR
14	12-847883	WASHER, THROTTLE ACTUATOR SCREW
15	27947	SWIVEL, LINKAGE - ECONOMISER COLLAR
16	25996A1	SWIVEL, AND LINK ROD ASSEMBLY
17	66856A1	ADAPTOR, MAGNETO
18	22-25094	FITTING, GREASE - MAGNETO ADAPTOR
19	12-27939	WASHER, MAGNETO PILOT
20	14-27960	TAB WASHER, ADAPTOR CAP FASTENING
21	13-27959	WASHER, WAVE - MAGNETO BALL BEARING TENSION
23	10-30110	SCREW, ADAPTOR AND PILOT TO MAGNETO
24	10-78841	SCREW, ADAPTOR AND PILOT TO CRANKCASE
25	12-20084	WASHER, ADAPTOR AND PILOT TO CRANKCASE SCREW
26	11-22053	NUT, ADAPTOR AND PILOT TO CRANKCASE SCREW
27	53458	PLATE, THROTTLE STOP
28	37-29315	DECAL, THROTTLE STOP PLATE (STOP ADJUSTMENTS)
30	11-20088	NUT, THROTTLE STOP ADJUSTING SCREW
31	26852	CAP, NYLON - ADJUSTING SCREW
32	10-69035	SCREW, THROTTLE STOP PLATE TO ADAPTOR
33	28-28657	KEY, MAGNETO DRIVING
34	29784	HUB, DRIVEN PULLEY (NEW STYLE - SEE NOTE BELOW)
35	29783A1	DRIVEN PULLEY ASSEMBLY (NEW STYLE - SEE NOTE BELOW)
36	17-24873	ROLL PIN, FLANGE LOCATING (NEW STYLE - SEE NOTE BELOW)
37	29785	FLANGE, DRIVEN PULLEY (NEW STYLE - SEE NOTE BELOW)
38	12-20138	WASHER, PULLEY CLAMPING SCREW
39	10-32228	SCREW, PULLEY CLAMPING
40	20140	BELT, TIMING
41	27949	ROD, LINK - UPPER
42	11-25168	NUT, UPPER LINK ROD ADJUSTING
43	27948	SWIVEL, UPPER AND LOWER LINK RODS
44	28061	LEVER, LINKAGE - UPPER
45	27941	LEVER, LINKAGE - LOWER
46	F17950	ROD, LINK - LOWER
47	27940	SHAFT, VERTICAL
48	23-22981	BUSHING, NYLON - VERTICAL SHAFT
49	17-25870	ROLL PIN, VERTICAL SHAFT AND LINKAGE LEVERS
50	12-8M0204649	WASHER, UPPER AND LOWER SWIVEL
51	11-8267089	NUT, UPPER AND LOWER SWIVEL TO LEVER AND BRACKET
52	10-25781	SCREW, SET - LINKAGE LEVER
53	12-25866	WASHER, VERTICAL SHAFT - CENTER
54	33-813416	SPARK PLUG
55	85-63709A1	PROTECTOR, SPARK PLUG
57	25-25429	"O" RING, HIGH TENSION LEAD CABLE TO END CAP COVER
58	54-29425	CLIP, HIGH TENSION LEAD CABLE FASTENING
59	54-25231	CLIP, MERCURY SWITCH AND HARNESS LEADS TO MAGNETO
60	10-20401	SCREW, LEAD CLIP TO MAGNETO
61	8M0084613	"D" WASHER, CLIP FASTENING SCREW
62	394-1134A1	GROUND STRAP ASSEMBLY, MAGNETO TO CRANKCASE

▶MAGNETO ASSEMBLY (47 parts)

Ref	OEM Part #	Part Name
-	394-2271A2	MAGNETO ASSEMBLY, COMPLETE (4D-3)
1	394-1570	FRAME, MAGNETO HOUSING
2	10-25510	SCREW, SET - COIL BRIDGE
3	394-1051	LOCKWIRE, COIL BRIDGE SET SCREW
4	30-24998	BEARING, BALL (DRIVE END)
5	394-1067A1	MAGNETIC ROTOR AND SHAFT
6	30-49090	BEARING, BALL (OPPOSITE DRIVE END)
7	394-1637	SUPPORT, BALL BEARING
8	10-25509	SCREW AND LOCKWASHER, SUPPORT TO FRAME
9	84-60466A13	WIRE ASSEMBLY, PRIMARY GROUND LEAD
10	10,10-29182	SCREW, PRIMARY GROUND
11	12-30267	WASHER, PRIMARY GROUND TERMINAL HOLDING
12	394-1579	INSULATOR, PRIMARY GROUND TERMINAL
13	12-29099	WASHER, INSULATING - PRIMARY GROUND SCREW
14	23-62769	BUSHING, INSULATING - HOUSING FRAME
15	12-26014	WASHER, PRIMARY GROUND SCREW
16	11-24656	NUT, LOCK - PRIMARY GROUND SCREW
17	11-68219	NUT, PRIMARY GROUND SCREW
18	394-1128A1	COIL ASSEMBLY
19	394-1050	CLIP, COIL - HIGH TENSION
20	13-23836	LOCKWASHER, COIL TERMINAL
21	394-1131	NUT, COIL CLIP FASTENING
22	393-1504A11	BREAKER ASSEMBLY
23	393-1586	GROMMET, PLASTIC - BREAKER BRACKET
24	16-29230	STUD, PRIMARY LEAD AND TENSION SPRING FASTENING
25	11-29236	NUT, PRIMARY LEAD FASTENING
26	394-1106A1	HOLDER AND CAM WICK ASSMELBY
27	12-26439	WASHER, BREAKER PIVOT PIN
28	18-26953	COTTER PIN, BREAKER TO PIVOT PIN
29	10-20597	SCREW, BREAKER HOLDER TO HOUSING
30	394-1130A1	CONDENSER
31	10-25509	SCREW AND LOCKWASHER, CONDENSER FASTENING
32	27-29166	GASKET, MAGNETO COVER
33	394-1577A2	COVER, MAGNETO
34	10-29418	SCREW, COVER TO FRAME
35	14-29157	TAB WASHER, COVER FASTENING SCREW
36	394-2602A1	MAGNETO ROTOR ASSEMBLY
37	394-1110	CLIP, SPRING
38	27-25725	GASKET, END CAP OVER
39	394-1561A2	END CAP COVER ASSEMBLY
40	394-1065A1	LEAD ASSEMBLY, HIGH TENSION
41	394-1056A1	BRUSH AND SPRING ASSEMBLY
42	10-25517	SCREW, HIGH TENSION CABLE FASTENING
43	29121	PIPE PLUG, END CAP COVER
44	10-29418	SCREW, END CAP COVER TO MAGNETO COVER
45	14-29157	TAB WASHER, COVER FASTENING SCREW
46	22-996642	ELBOW, PLASTIC - MAGNETO COVER VENT

▶MERC 400ML AND MERC 400EL PARTS LIST (0 parts)

▶MERC 400S AND MERC 400SL PARTS LIST (0 parts)

▶MISCELLANEOUS PARTS/ACCESSORIES (1 parts)

Ref	OEM Part #	Part Name
-	94-39394	SHIPPING CARTON (MOTOR)

▶RECTIFIER, STARTER SOLENOID AND WIRING HARNESS (25 parts)

Ref	OEM Part #	Part Name
1	32177A2	RECTIFIER ASSEMBLY
2	32-26693A1	SLEEVE, RECTIFIER LEAD (RED)
3	22647	DISCONNECT, KNIFE SPLICE - RECTIFIER LEAD WIRES
4	13-8M0204647	LOCKWASHER, RECTIFIER MOUNTING SCREW
5	11-21929	NUT, RECTIFIER MOUNTING SCREW
6	28597	BRACKET, RECTIFIER MOUNTING
7	10-21091	SCREW, RECTIFIER BRACKET TO BOTTOM COWL
8	11-24652	NUT, BRACKET MOUNTING SCREW
9	54-24836	CLAMP, LEAD WIRE TO RECTIFIER BRACKET - UPPER (1/4)
10	54-22740	CLAMP, LEAD WIRE TO RECTIFIER BRACKET - LOWER (3/8)
11	10-8M0113176	SCREW, LEAD WIRE CLAMP TO BRACKET
12	8M0084613	"D" WASHER, CLAMP FASTENING SCREW
13	32445A1	SOLENOID, STARTER
14	28016A1	GROUND STRAP ASSEMBLY, SOLENOID TO STARTER
15	84-93389A12	WIRE, STARTER TO STARTER SOLENOID
16	13-8M0204647	LOCKWASHER, SOLENOID TERMINAL (5/16)
17	11-26062	NUT, CAP - SOLENOID TERMINAL - OUTSIDE (5/16)
18	10,13-26996	LOCKWASHER, SOLENOID TERMINAL
19	10,11-68219	NUT, SOLENOID TERMINAL
20	10-29238	SCREW, SOLENOID TO STARTER MOTOR
21	33401	WIRING HARNESS (INTERNAL)
22	24-28975	SPRING, GARTER - INTERNAL WIRING HARNESS
23	26079A2	PLATE, BACKING - WIRING HARNESS
24	10-45893	SCREW, BACKING PLATE TO BOTTOM COWL
25	54-22783	"S" CLIP, WIRING HARNESS LEADS TO BOTTOM COWL

▶TOP COWL AND STARTER ASSEMBLY (49 parts)

Ref	OEM Part #	Part Name
--	12-20583	WASHER, TOP COWL STUD (1/32")
1	177-2355A4	TOP COWL ASSEMBLY
2	16-20500	STUD, REAR - TOP COWL TO COVER
3	16-20353	STUD, FRONT - TOP COWL TO CRANKCASE
4	25-20116	GROMMET, CHOKE KNOB
5	28967	SCREEN, VENT - TOP COWL
6	10-26668	SCREW, VENT SCREEN TO TOP COWL
7	29228A1	TRIM MOULDING ASSEMBLY, TOP COWL
8	10-29226	SCREW, DECORATIVE - MOULDING TO TOP COWL
9	10-29227	SCREW, BRASS - MOULDING TO TOP COWL
10	13-26995	LOCKWASHER, MOULDING FASTENING SCREW
11	11-26419	NUT, MOULDING FASTENING SCREW
12	37-46023A1	DECAL SET, TOP COWL
13	23-20326	SPACER, TOP COWL STUD
14	12-20028	WASHER, TOP COWL STUD (1/16")
15	12-69057	WASHER, TOP COWL STUD (3/4" OD)
16	11-8267089	NUT, TOP COWL FASTENING
17	20155	RETAINER, STARTER SPRING
18	24-29340T02	SPRING, STARTER REWIND
19	23-28912	BUSHING, SPRING GUIDE
20	50-30994	SHEAVE ASSEMBLY
21	30596	PAWL, STARTER
22	13-36206	WASHER, WAVE - STARTER PAWL
23	23-28919	BUSHING, NYLON - SHEAVE SHAFT SPACER
24	45477A1	SPACER, SHEAVE SHAFT
25	26179	RETAINER, WAVE WASHER
26	12-26180	WASHER, WAVE WASHER RETAINER
27	13-20160	WASHER, WAVE - RETAINER TENSION
28	30595	PLATE, RETAINER - STARTER PAWL
29	45477A1	SHAFT, SHEAVE
30	50-12066Q10	STARTER CABLE ASSEMBLY
31	28747	HANDLE, STARTER CABLE
32	79470A1	RETAINER, STARTER CABLE AND HANDLE
33	30045	PLATE, ROPE GUIDE
34	10-28642	SCREW, DRIVE, ROPE GUIDE PLATE TO TOP COWL
35	14-20165	TAB WASHER, SHEAVE SHAFT NUT
36	11-20166	NUT, SHEAVE SHAFT (LEFT HAND THREAD)
37	31875	HANDLE, CHROME - TOP COWL
38	31003	HANDLE, INSIDE - TOP COWL
39	1398-3119	BUTTON, BUMPER - TOP COWL HANDLE
40	12-69057	WASHER, LOWER HANDLE STUD (3/4" OD)
41	12-8M0204649	WASHER, CENTER HANDLE STUD (1/2" OD)
42	11-21825	NUT, INSIDE HANDLE TO CHROME HANDLE STUDS
43	10-56500	SCREW, FRONT - HANDLE TO TOP COWL (1 1/4")
44	11-8267089	NUT, FRONT HANDLE FASTENING SCREW
45	10-29199	SCREW, CENTER - HANDLE TO TOP COWL (1")
46	23-29561	BUSHING, REAR HANDLE STUD
47	13-26992	LOCKWASHER, REAR HANDLE STUD
48	11-21825	NUT, REAR HANDLE STUD

100-Hour / Annual Service Checklist

Regular maintenance keeps your Mercury 400 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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