Mercury 500 (1639473 THRU 1755548) Parts & Diagrams

🔎 Mercury 500 Reference Library — Exploded parts diagrams (16 diagrams), specifications, common issues, and maintenance checklist.

The Mercury 500 is a 4-Stroke, Inline 4-Cylinder, EFI, SOHC outboard motor. Commonly used on jon boats, pontoons, and mid-size utility craft.

Quick Reference Specifications

Specification	Value
Engine Type	4-Stroke, Inline 4-Cylinder, EFI, SOHC
Horsepower	50 HP
Displacement	995 cc
Bore x Stroke	65 mm x 75 mm
Spark Plug (Type & Gap)	NGK IZFR6F-11
Engine Oil Capacity	3.0 L (3.17 quart)
Recommended Engine Oil	SAE 25W-40 Mercury FourStroke Oil
Gear Case Oil Capacity	440 mL (14.9 fl oz)
Idle Speed (in gear)	650 ± 50 RPM (in gear)
Full Throttle RPM Range	5000-6000
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 500:

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 500.

▶BOTTOM COWL ASSEMBLY (53 parts)

Ref	OEM Part #	Part Name
1	103-2354A2	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 FATENING SCREW
5	11-26419	NUT, PLUG COVER FASTENING SCREW
6	26552	SUPPORT, EXTERNAL WIRING HARNESS
7	10-20639	SCREW, HARNESS SUPPORT TO BOTTOM COWL
8	12-20084	WASHER, HARNESS SUPPORT FASTENING SCREW
9	11-29250	NUT, HARNESS SUPPORT FASTENING SCREW
10	23760	BAFFLE, BOTTOM COWL
11	10-21106	SCREW, BAFLE TO BOTTOM COWL
12	30999	BRACKET, LOCK KNOB - COWL FRONT COVER
13	10-21091	SCREW, BRACKET TO BOTTOM COWL (1 1/8")
14	11-8M0207775	NUT, BRACKET FASTENING SCREW
15	21104A2	CONNECTOR BASE ASSEMBLY
16	13-21972	LOCKWASHER, CONNECTOR BASE
17	11-21971	NUT, CONNECTOR BASE TO BOTTOM COWL
18	54-25231	CLIP, CONNECTOR BASE LEAD WIRE
19	10-22815	SCREW, LEAD WIRE CLIP TO BOTTOM COWL
20	32-8M0108355	TUBE, VENT - MAGNETO OUTLET (10 1/2")
21	22-996642	ELBOW, MAGNETO VENT TUBE
22	19-824928001	PLUG, BOTTOM COWL HOLE
23	20557	BRACKET, CABLE END ANCHOR
24	10-29200	SCREW, ANCHOR BRACKET TO BOTTOM COWL
25	29532	LEVER, THROTTLE CONTROL
26	30612	LEVER, SHIFT CONTROL
27	23-29529	BUSHING, THROTTLE AND SHIFT LEVER
28	12-8M0042641	WASHER, THROTTLE AND SHIFT LEVER SCREW
29	10-37612	SCREW, THROTTLE AND SHIFT LEVER FASTENING
30	17-30978A1	PIN ASSEMBLY, CLEVIS YOKE
31	17-239281	ROLL PIN, CLEVIS YOKE PIN
32	10-20584	SCREW, CLEVIS YOKE PIN TO CONTROL LEVER
33	13-29402	WASHER, WAVE - CLEVIS PIN FASTENING SCREW
34	11-8M0204718	NUT, CLEVIS PIN FASTENING SCREW
35	25180	SHIFT SHAFT ASSEMBLY, UPPER
36	27714	ROD (SLEEVE), SHIFT CONTROL END
37	11-25168	NUT, ADJUSTING - SHIFT SHAFT END
38	25134	ROD, LINK - SHIFT SHAFT END
39	18-25191	COTTER PIN, LINK ROD TO SHIFT SHAFT
40	12-20583	WASHER, SHIFT CONTROL END ROD
41	24-25065	SPRING, DETENT - SHIFT SHAFT
42	10-98256	SCREW, DETENT SPRING TO BOTTOM COWL
43	12-69057	WASHER, DETENT SPRING SCREW
44	11-20013	NUT, DETENT SPRING FASTENING SCREW
45	30109	GROUND STRAP, CYLINDER BLOCK TO BOTTOM COWL
46	27-20390	GASKET, POWERHEAD TO BOTTOM COWL
47	35392A1	TRIM MOULDING ASSEMBLY, BOTTOM COWL
48	29998	SPLICER, TRIM MOULDING - REAR
49	10-29226	SCREW, DECORATIVE - TRIM MOULDING TO COWL
50	12-24671	WASHER, FIBRE - MOULDING FASTENING SCREW
51	11-29225	NUT, NYLON CAP - MOULDING FASTENING SCREW
52	13-26995	LOCKWASHER, MOULDING FASTENING SCREW
53	11-26419	NUT, BRASS - MOULDING FASTEING SCREW

▶CARBURETOR ASSEMBLY (38 parts)

Ref	OEM Part #	Part Name
--	1395-92621	REPAIR PARTS KIT (1 PER CARBURETOR)
1	1333-2099	CARBURETOR ASSEMBLY, COMPLETE (KA-19A)
2	1395-8673	FLOAT ASSEMBLY
3	17-20853	PIN, FLOAT LEVER PINION
4	1399-102	LEVER, FLOAT (LOWER)
5	1399-101	LEVER, FLOAT (UPPER)
6	1395-92581	INLET NEEDLE, SEAT AND GASKET
7	27-25033	GASKET, INLET SEAT
8	1399-99	GASKET, FLOAT BOWL COVER
9	1399-1133	COVER, FLOAT BOWL
10	10-22625	SCREW, FLOAT BOWL COVER (SHORT)
11	10-25850	SCREW, FLOAT BOWL COVER (LONG)
12	27-25851	GASKET, STRAINER COVER (LARGE)
13	1399-3938	SCREEN, FILTER
14	27-25849	GASKET, STRAINER COVER (SMALL)
15	1399-1135	COVER, STRAINER
16	27-25848	GASKET, STRAINER COVER SCREW
17	10-25822	SCREW, STRAINER COVER FASTENING
18	1395-6027	SCREW, THROTTLE STOP LEVER
19	8146791	LEVER, THROTTLE STOP (SEE NOTE BELOW)
20	1399-2012	SHAFT, THROTTLE
21	1399-1710	TUBE, IDLE
22	27-23180	GASKET, IDLE TUBE
23	10-23035	SCREW AND LOCKWASHER, THROTTLE SHUTTER
24	1399-1711	SHUTTER, THROTTLE
25	24-27160	SPRING, IDLE ADJUSTMENT SCREW
26	1399-1713	SCREW, IDLE ADJUSTMENT
27	10-28405	SCREW, PLUG - MAIN FUEL JET CHANNEL
28	27-28406	GASKET, JET CHANNEL PLUG SCREW
29	1399-1655	JET, MAIN FUEL (.055)
30	27-28409	GASKET, MAIN FUEL JET
31	1399-1888	NOZZLE, MAIN
32	10-23178	SCREW, PLUG - MAIN NOZZLE
33	24-20869	SPRING, THROTTLE SHAFT RETURN (UPPER CARBURETOR)
34	10-23030	SCREW, PLUG - BODY CHANNEL
35	19-20011	WELCH PLUG, BODY CHANNEL
36	27-757911	GASKET, CARBURETOR FLANGE
37	11-29250	NUT, CARBURETOR MOUNTING STUD

▶CARBURETOR LINKAGE AND CHOKE SOLENOID (33 parts)

Ref	OEM Part #	Part Name
1	31593	CHOKE SOLENOID, TOP COWL
2	22647	DISCONNECT, KNIFE - CHOKE SOLENOID LEAD
3	10-20540	SCREW, CHOKE SOLENOID TO TOP COWL
4	13-26992	LOCKWASHER, CHOKE SOLENOID SCREW
5	26716A1	GROUND STRAP ASSEMBLY, CHOKE SOLENOID TO ADAPTOR
6	10-24773	SCREW, CHOKE SOLENOID TO TOP COWL
7	13-26991	LOCKWASHER, CHOKE SOLENOID SCREW
8	32-26693A1	SLEEVE, CHOKE SOLENOID LEAD
9	54-22783	"S" CLIP, CHOKE SOLENOID LEAD TO TOP COWL
10	90242A1	KNOB, CHOKE ROD
11	25-20116	GROMMET, CHOKE RD
12	22462	"U" LINK, CHOKE ROD TO CHOKE KNOB
13	13-26996	LOCKWASHER, "U" LINK SCREW
14	10-69022	SCREW, "U" LINK TO CHOKE KNOB
15	18-210711	COTTER PIN, "U" LINK TO CHOKE ROD
16	38604	SHUTTER, CHOKE - CARBURETOR (UPPER)
17	23-30438	BUSHING, NYLON-UPPER CHOKE SHUTTER
18	31519	ROD, CHOKE
19	17-25319	RIVET, CHOKE SHUTTER TO CHOKE ROD
20	16-30172	STUD, CARBURETOR - CHOKE SHUTTER PIVOT
21	12-30164	WASHER, CHOKE SHUTTER CARBURETOR STUD
22	11-20110	NUT, CHOKE SHUTTER TO CARBURETOR STUD
23	24-28965	SPRING, TENSION - CHOKE ROD
24	10-28713	SCREW, RETAINER TO LOWER CARBURETOR
25	27711	RETAINER, CHOKE ROD SPRING TO CARBURETOR
26	1333-2099	CARBURETOR ASSEMBLY, COMPLETE
27	53719A2	THROTTLE PICK-UP BRACKET ASSEMBLY
28	10-29239	SCREW, THROTTLE PICK-UP BRACKET MOUNTING
29	27917	CLUSTER, THROTTLE LEVER (UPPER CARBURETOR)
30	1395-6027	SCREW, CLUSTER TO THROTTLE LEVER
31	48315A4	PLUNGER AND LINK ASSEMBLY, CHOKE SOLENOID
32	12-30164	WASSHER, PLUNGER AND LINK
33	18-26953	COTTER PIN, LINK TO UPPER CHOKE SHUTTER

▶CLAMP AND SWIVEL BRACKET ASSEMBLY (40 parts)

Ref	OEM Part #	Part Name
1	1401-1977A1	CLAMP BRACKET ASSEMBLY
2	28403A3	THUMB SCREW ASSEMBLY
3	12-28404	WASHER, THUMB SCREW
4	8M0041936	TUBE, TILT - CLAMP BRACKET TO SWIVEL BRACKET
5	12-52864	SHIM, CLAMP BRACKET TO SWIVEL BRACKET
6	11-858869	NUT, TILT TUBE FASTENING
7	53078	CAP, PLASTIC - TILT TUBE ENDS
8	16-59625	STUD, CLAMP BRACKET
9	23-59624	SPACER, CLAMP BRACKET STUD
10	13-8M0204647	LOCKWASHER, CLAMP BRACKET STUD
11	11-22053	NUT, STUD TO CLAMP BRACKETS
12	17-8M0026068	TILT LOCK PIN ASSEMBLY
13	26903A3	REVERSE LOCK ASSEMLY
14	18-45882	COTTER PIN, REVERSE LOCK TO SHAFT
15	24-29821	SPRING, TENSION - REERSE LOCK
16	17-25598	ROLL PIN, REVERSE LOCK SPRING ATTACHING
17	56349	SHAFT, REVERSE LOCK TO SWIVEL BRACKET
18	1442-2501A1	SWIVEL BRACKET ASSEMBLY
19	22-69059	FITTING, GREASE - SWIVEL BRACKET
20	26-32911	OIL SEAL, SWIVEL BRACKET
21	19-77633Q	LUBRICAP, SWIVEL BRACKET GREASE FITTING
22	29057	LEVER, TILT STOP - PORT SIDE
23	29056	LEVER, TILT STOP - STARBOARD SIDE
24	10-27791	SCREW, ANCHOR - TILT STOP LEVER
25	23-29055	SPACER, TILT STOP LEVER ANCHOR SCREW
26	10-27790	SCREW, RETAINING - TILT STOP LEVER
27	15-20473A1	SHIM, RETAINING SCREW - PORT SIDE Comment: SEE NOTE BELOW
28	13-20846	WASHER, WAVE - RETAINING SCREW - PORT SIDE Comment: SEE NOTE BELOW
29	11-24652	NUT, ANCHOR AND RETINING SCREW
30	12-26837	WASHER, SWIVEL PIN TO BOTTOM YOKE (.065)
31	77416T1	YOKE, BOTTOM
32	17-28418A4	SWIEL PIN AND TOP YOKE ASSEMBLY
33	30711	BUMPER, TOP YOKE
34	10-33986	BOLT, UPPER MOUNT TO SWIVEL PIN
35	11-71956	NUT, RETINING - SWIVEL PIN
36	38-56267	SERIAL PLATE
37	10-25612	SCREW, DRIVE - SERIAL PLATE TO SWIVEL BRACKET
38	10-68298	BOLT, CLAMP BRACKET TO BOAT TRANSOM
39	12-68410	WASHER, CLAMP BRACKET TRANSOM BOLT
40	11-82670912	NUT, CLAMP BRACKET TRANSOM BOLT

▶COWLING AND FRONT COVER (21 parts)

Ref	OEM Part #	Part Name
--	92-86166Q1	GLUE, ADHESIVE - SOUND BLANKET FASTENING
1	2182-7927A5	COWL FRONT COVER ASSEMBLY
2	37-37839	DECAL, "MERC 500"
3	37-37838	DECAL, FRONT COVER EMBLEM
4	56848	KNOB, COWL FRONT COVER FASTENING
5	12-30771	WASHER, COVER FASTENING KNOB (RUBBER)
6	12-27129	WASHER, COVER FASTENING KNOB (STEEL)
7	24-30772	SPRING, TENSION - COVER FASTENING KNOB
8	17-29077	ROLL PIN TENSION SPRING TO KNOB
9	38674	BLANKET, SOUND ABSORBING - FRONT COVER
10	31095	SEAL, SOUND - LOWER SECTION
11	35552	SEAL, SOUND - UPPER SECTION
12	2106-2353A2	WRAP AROUND COWL ASSEMBLY
13	21060	HANDLE, COWL LATCH
14	17-21057	PIN, HINGE - HANDLE TO COWL LATCH
15	53-21058	"E" RING, HANDLE TO COWL LATCH HINGE PIN
16	25690	SWIVEL, COWL LATCH
17	25691	HOOK, COWL LATCH FASTENING
18	37-35505	DECAL, WRAP AROUND COWL - STARBOARD
19	37-35504	DECAL, WRAP AROUND COWL - PORT
20	24825	BLANKET, SOUND ABSORBING - WRAP AROUND COWL

▶CRANKSHAFT, PISTON AND CONNECTING ROD (29 parts)

Ref	OEM Part #	Part Name
-	39-28616A12	RING, PISTON (/015) OVERSIZED
1	11-8M0214915	NUT, FLYWHEEL
2	12-26617	WASHER, FLYWHEEL NUT
3	28-20094	KEY, FLYWHEEL DRIVE
4	400-2976A2	CRANKSHAFT
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	10-25313	SCREW, MAIN BEARING CLAMPING (1/2")
16	11-29469	NUT, MAIN BEARING CLAMPING SCREW
17	34-88498A1	REED SET, MATCHED - MAIN BEARING
18	34-20053	REED STOP, MAIN BEARING REED VALVES
19	10-77280	SCREW, REED STOP MOUNTING (1/2")
20	11-29469	NUT, REED STOP MOUNTING SCREW
21	724-2537A2	PISTON AND PISTON PIN ASSEMBLY
23	39-27841A12	RING, PISTON
24	600-2748A2	CONNECTING ROD AND CAP ASSEMBLY (SEE NOTE BELOW)
25	10-45379	SCREW, CAP TO CONNECTING ROD
26	11-20061	NUT, CONNECTING ROD SCREW
27	29-20046T	BEARING, NEEDLE - CRANKPIN
28	29-20063	BEARING,NEEDLE - PISTON PIN
29	12-28121	WASHER, NEEDLE LOCATING

▶CYLINDER BLOCK AND CRANKCASE ASSEMBLY (54 parts)

Ref	OEM Part #	Part Name
--	13-8M0204647	LOCKWASHER, EXHAUST EXTENSION FASTENING SCREW Comment: SERIAL 01674193-09999999
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
6	10-29198	SCREW, UPPER END CAP MOUNTING
7	831-2414A2	CYLINDER BLOCK AND CRANKCASE ASSEMBLY
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 AND BALANCE TUBE HOLES
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	36157	SCREW, EXHAUST EXTENSION TO CYLINDER BLOCK Comment: SERIAL 01674193-09999999
18	10-25299	SCREW, EXHAUSXT EXTENSION TO CYLINDER BLOCK STARTED WITH SER Comment: SERIAL 01674193-09999999
20	10-78841	SCREW, CRANKCASE TO CYLINDER BLOCK (1 1/2")
21	10-22039	SCREW, CRANKCASE TO CYLINDER BLOCK (2 3/4")
22	11-29250	NUT, CRANKCASE FASTENING SCREW
23	10-98260	SCREW, MAIN BEARING LOCKING
24	14-20091	TAB WASHER, BEARING LOCKING SCREW
25	10-20359	SCREW, CENTER MAIN BEARING LOCKING
26	1102-4181A3	END CAP ASSEMBLY, LOWER
27	21-28481A1	CHECK VALVE ASSEMBLY, LOWER END CAP
28	26-29478	OIL SEAL, LOWER
29	26-41953	OIL SEAL, UPPER
30	25-20081	"O" RING, LOWER END CAP
31	30-63742T	BALL BEARING, LOWER END CAP
32	15-20085A1	SHIM, LOWER END CAP TO CRANKCASE AND BLOCK
33	10-29198	SCREW, LOWER END CAP MOUNTING
34	32-8M0108355	TUBE, BALANCE - MAIN BEARING
35	22-291112	CONNECTOR, BALANCE TUBE TO CYLINDER BLOCK
36	54-20386	CLAMP, BALANCE TUBE TO CONNECTORS
37	27-26923	GASKET, MANIFOLD PLATE TO EXHAUST COVER
38	26922	PLATE, EXHAUST MANIFOLD
39	28240	COVER, EXHAUST MANIFOLD
40	10-28666	SCREW, MANIFOLD COVER AND HIGH TENSION LEAD CLIP MOUNTING
41	12-20028	WASHER, MANIFOLD COVER AND HIGH TENSION LEAD CLIP SCREWS
42	27-22333	GASKET, CYLINDER BLOCK COVER
43	1000-1A1	CYLINDER BLOCK COVER ASSEMBLY
44	23-26348	BUSHING, CYLINDER BLOCK COVER
45	10-20653	SCREW, CYLINDER BLOCK COVER MOUNTING
46	11-24652	NUT, COVER MOUNTING SCREW
47	27-279361	GASKET, TRANSFER PORT COVER
48	27935	COVER, TRANSFER PORT
49	10-20540	SCREW, TRANSFER PORT COVER MOUNTING
50	22-62365A1	CHECK VALVE ASSEMBLY, BLEED HOSE (UPPER)
51	21-28481A1	CHECK VALVE ASSEMBLY, BLEED HOSE VALVE
52	32-9912688	HOSE, CYLINDER BLEEN (6 1/2")
53	22-67902	CONNECTOR, CYLINDER BLEED HOSE (LOWER)
54	54-20387	CLAMP, BLEED HOSE TO CHECK VALVE AND CONNECTOR

▶DRIVE SHAFT HOUSING ASSEMBLY (48 parts)

Ref	OEM Part #	Part Name
1	1545-2337A4	DRIVE SHAFT HOUSING ASSEMBLY
2	16-8M0022145	STUD, DRIVE SHAFT HOUSING TO GEAR HOUSING (1 3/4")
3	16-57935	STUD, DRIVE SHAFT HOUSING TO GEAR HOUSING (3")
4	11-8M0204653	NUT, GEAR HOUSING TO DRIVE SHAFT HOUSING STUDS (7/16)
5	11-862902	NUT, POWERHEAD TO DRIVE SHAFT HOUSING (5/6)
6	19-32298	PLUG, PLASTIC - WATER PICK-UP SCREW HOLE
7	32-31998	TUBE, WATER INLET
8	23-23561	SLEEVE, WATER INLET TUBE
9	25-24961	RING, RUBBER - WATER INLET TUBE
10	26-25192	SEAL, WATER INLET TUBE
11	35394A1	TRIM COVER ASSEMBLY
12	37-35393	DECAL, TRIM COVER - PORT AND STARBOARD
13	10-30742	SCREW, TRIM COVER TO DRIVE SHAFT HOUSING
14	32016	BAFFLE, EXHAUST RELIEF
15	10-25255	SCREW, RELLIEF BAFFLE TO DRIVE SHAFT HOUSING
16	27-31995	GASKET, BOTTOM COWL TO DRIVE SHAFT HOUSING
17	25305	CAP, RUBBER - UPPER MOUNT BOLT NUT
18	11-23161	NUT, UPPER MOUNT BOLT
19	12-30519	WASHER, UPPER MOUNT BOLT (3/8 ID)
20	12-30521	WASHER, RUBBER - UPPER MOUNT BOLT
21	12-30520	WASHER, UPPER MOUNT BOLT (37/64/ID)
22	79680A1	COVER, UPPER MOUNT - OUTSIDE HALP
23	79680A1	COVER, UPPER MOUNT - INSIDE HALF
24	75305	MOUNT, RUBBER - UPPER
25	24929	PACKING, "U" CUP - UPPER MOUNT COVERS
26	10-28772	SCREW, UPPER MOUNT COVER - REAR (1 1/2")
27	10-37941	SCREW, UPPER MOUNT COVER - FRONT (1 3/4')
28	12-8M0204649	WASHER, MOUNT COVER FASTENING SCREW
29	11-35888	NUT, UPPER MOUNT COVER FASTENING SCREW
30	22-22946	BAMPER, RUBBER - LOWER MOUNT SCREW
31	10-75284	SCRWE, LOWER MOUNT (5 1/2")
32	12-28051	WASHER, LOWER MOUNT SCREW
33	12-28053	WASHER, RUBBER - LOWER MOUNG SCREW
34	75304T1	MOUNT, RUBBER - LOWER
35	12-30119	WASHER, LOWER MOUNT SCREW (1/8")
36	11-25196	NUT, LOWER MOUNT SCREW
37	69592F1	CLAMP, LOWER MOUNT TO DRIVE SHAFT HOUSING
38	24-35522	SPRING, TENSION - LOWER MOUNT CLAMP
39	10-29256	SCREW, LOWER MOUNT CLAMP TO DRIVE SHAFT HOUSING
40	11-35521	NUT, LOWER MOUNT CLAMP COVER
41	35474T	COVER, LOWER MOUNT CLAMP
42	10-29722	SCREW, COVER TO LOWER MOUNT CLAMP
43	22-390721	PLUG, GREASE - REVERSE LOCK HOLE
44	52920	LEVER, REVERSE LOCK
45	24-25122	SPRING, TENSION - PUSH ROD
46	17-24887	PIN, REVERSE LOCK LEVER
47	28470	ROD, PUSH - REVERSE LOCK
48	18-25191	COTTER PIN, PUSH ROD TO REVERSE LOCK

▶FLYWHEEL ASSEMBLY AND STATOR (15 parts)

Ref	OEM Part #	Part Name
-	10-32417	SCREW, PLATE AND RATCHET TO FLYWHEEL HUB
1	11-8M0214915	NUT, FLYWHEEL
2	12-33001	WASHER, FLYWHEEL NUT
3	28-20094	KEY, FLYWHEEL DRIVE
4	223-2402A7	FLYWHEEL ASSEMBLY
5	223-2403A10	FLYWHEEL ASSEMBLY
6	29788	FLANGE, FLYWHEEL PULLEY
7	30306	PULLEY, FLYWHEEL
8	17-26618	DOWEL PIN, PULLEY TO FLYWHEEL
9	29787	HUB, FLANGE - FLYWHEEL PULLEY
10	398-2171	STATOR, ALTERNATOR - FLYWHEEL
11	10-57021	SCREW, STATOR TO UPPER END CAP
12	54-24836	CLAMP, STATOR LEAD TO CRANKCASE FLANGE
13	8M0084613	"D" WASHER, STATOR LEAD CLAMP SCREW
14	10-8M0113176	SCREW, STATOR LEAD CLAMP FASTENING

▶FUEL PUMP ASSEMBLY (26 parts)

Ref	OEM Part #	Part Name
1	30269A2	FUEL PUMP ASSEMBLY
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") SEE NOTE BELOW
11	10-29029	SCREW, FUEL PUMP MOUNTING (1 1/2") SEE NOTE BELOW
12	22-22949	CONNECTOR, PUMP INLET TO FUEL LINE
13	22-22946	SLEEVE, RUBBER - CONNECTOR
14	22-22948	NUT, CONNECTOR TO FUEL LINE
15	32-32094	FUEL LINE, FUEL PUMP TO LOWER AND UPPER 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	30186	ADAPTOR, CHECK UNIT (FUEL LINE)
21	30187	STEM, CHECK UNIT ADAPTOR
22	25-16524	"O" RING, ADAPTOR STEM
23	24-30189	SPRING, ADAPTOR STEM
24	30188	CUP WASHER, ADAPTOR
25	10-20784	SCREW, ADAPTOR TO BOTTOM COWL
26	11-24652	NUT, ADAPTOR SCREW

▶GEAR HOUSING ASSEMBLY, COMPLETE (PAGE 1) (43 parts)

Ref	OEM Part #	Part Name
-	1626-2040A3	GEAR HOUSING ASSEMBLY, COMPLETE (STANDARD)-SEE NOTE BELOW
1	1626-2040A1	GEAR HOUSING ASSEMBLY
2	16-32027	STUD, WATER PUMP BODY AND B ASE TO GEAR HOUSING
3	16-32017	STUD, GEAR HOUSING TO DRIVE SHAFT HOUSING
4	31-62091T	BEARING, ROLLER - DRIVE SHAFT
5	56622A1	SHAFT, SHIFT - LOWER
6	53-29641	CLIP, RETAINING - SHIFT SHAFT
7	25-25439	"O" RING, SHIFT SHAFT BUSHING
8	23-46284A1	BUSHING ASSEMBLY, SHIFT SHAFT
9	26-892361	OIL SEAL, SHIFT SHAFT BUSHING
10	52918	CAM, LOWER - REVERSE LOCKING
11	52919	CAM, UPPER - REVERSE LOCKING
12	45-31996	DRIVE SHAFT (STANDARD)
13	15-20929A1	SHIM, BEARING TO GEAR HOUSING
14	30-72961	BEARING, BALL - DRIVE SHAFT
15	53-29116	RING, SNAP - BALL BEARING RETAINING
16	15-20929A1	SHIM, BEARING TO WATER PUMP BASE
17	43-20834	GEAR, PINION - DRIVE SHAFT
18	14-29163	TAB WASHER, PINION GEAR FASTENING SCREW
19	10-20925	SCREW, PINION GEAR TO DRIVE SHAFT
20	27-32771	GASKET, WATER PUMP BASE TO GEAR HOUSING
21	25-26855	"O" RING, WATER PUMP BASE
22	46-39531A1	WATER PUMP BASE ASSEMBLY
23	26-90562	OIL SEAL, WATER PUMP BASE
24	17-29596T	DOWEL PIN, WATER PUMP BASE TO WATER PUMP BODY
25	27-19553	GASKET, LOWER - WATER PUMP BASE TO FACE PLATE
26	32768	PLTE, FACE - WATER PUMP BASE TO WATER PUMP BODY
27	27-19551	GASKET, UPPER - FACE PLATE TO WATER PUMP BODY
28	47-89983T	IMPELLER, WATER PUMP
29	28-8M0032837	PIN, IMPELLER DRIVE
30	46-60366Q1	WATER PUMP BODY ASSEMBLY
31	32001	INSERT, WATER PUMP BODY
32	26-32121	OIL SEAL, WATER PUMP BODY
33	13-26992	LOCKWASHER, WATER PUMP BODY AND BASE STUDS
34	11-29598	NAT, WATER PUMP BODY AND BASE FASTENING STUDS
35	26-25192	SEAL, WATER PUMP BODY TO WATER INLET TUBE
36	25-20273	RING, RUBBER - CENTRIFUGALE SLINGER (DRIVE SHAFT)
37	25-29619	"O" RING, UPPER - DRIVE SHAFT
38	10-29608	SCREW, GEAR HOUSING FLUSHING HOLE
39	27-8M0214916	GASKET, GEAR HOUSING FLUSHING HOLE SCREW
40	26-8M0214917	SEAL HOUSING FLUSHING HOLE
41	10-79953Q04	SCREW, GREASE FILLER AND VENT HOLE
42	12-191833	WASHER, GREASE FILLER AND VENT HOLE SCREW

▶GEAR HOUSING ASSEMBLY, COMPLETE (PAGE 2) (35 parts)

Ref	OEM Part #	Part Name
-	1626-2040A3	GEAR HOUSING ASSEMBLY, COMPLETE (STANDARD) - SEE NOTE BELOW
1	1626-2040A1	GEAR HOUSING ASSEMBLY (SEE PAGE 26 FOR PARTS BREAKDOWN)
43	760394	CAM, SHIFT
44	20930	FOLLOWER, CAM
45	20843	SLIDE, CROSS PIN
46	24-20254	SPRING, COMPRESSION - CAM FOLLOWER
47	15-31154A1	SHIM, BEARING CUP TO GEAR HOUSING
48	43-20975A5	FORWARD GEAR ASSEMBLY
49	31-20249	BEARING,ROLLER - FORWARD GEAR ASSEMBLY
50	31-31215A1	TAPERED ROLLER BEARING ASSEMBLY
51	31-31216	CUP, TAPERED ROLLER BEARING
52	52-32189	RATCHET, SLIDING CLUTCH
53	17-20841	PIN, CROSS - RATCHET TO PROPELLER SHAFT
54	53-20842	RING, RETINING - CROSS PIN
55	44-32000	SHAFT, PROPELLER
56	43-20975A5	REVERSE GEAR ASSEMBLY
57	12-32004	WASHER, THRUST - REVERSE GEAR
58	30-20839T	BEARING, BALL - REVERSE GEAR
59	15-20927A1	SHIM, THRUST WASHER TO GEAR HOUSING
60	25-31986	"O" RING, BEARING CARRIER
61	53014T1	BEARING CARRIER ASSEMBLY
62	31-20249	BEARING, ROLLER - BEARING CARRIER
63	26-90562	OIL SEAL, BEARING CARRIER
64	28-30281	KEY, LOCATING - BEARING CARRIER
65	12-31993	WASHER, GEAR HOUSING COVER
66	11-87763	COVER, GEAR HOUSING
67	12-25251	WASHER, BACKING - PROPELLER SHAFT (1/8)
68	38859A1	THRUST HUB AND WASHER ASSEMBLY
69	12-31992	WASHER, CUPPED - THRUST HUB
70	12-32007	WASHER, SPLINED - PROPELLER SHAFT
71	11-82671120	NUT, PROPELLER
72	97-31640Q4	TRIM TAB, GEAR HOUSING
73	10-32470	SCREW, TRIM TAB TO GEAR HOUSING
74	11-8M0204653	NUT, DRIVE SHAFT HOUSING TO GEAR HOUSING STUD (7/16)
75	11-23161	NUT, DRIVE SHAFT HOUSING TO GEAR HOUSING STUD (3/8)

▶MAGNETO ADAPTOR AND PILOT ASSEMBLY (63 parts)

Ref	OEM Part #	Part Name
-	29321A7	MAGNETO ADAPTOR AND PILOT ASSEMBLY, COMPLETE
1	394-2271A2	MAGNETO ASSEMBLY, COMPLETE (4D-4)
2	45-27951	SHAFT, MAGNETO DRIVE
3	39560A1	MAGNETO ADAPTOR AND PILOT ASSEMBLY, COMPLETE
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 - MAGNETO ADAPTOR
11	38230A1	THROTTLE ACTUATOR ASSEMBLY
12	23-26602	BUSHING, NYLON-THROTTLE ACTUATOR
13	10-31009	SCREW, THROTTLE ACTUATOR TO ECONOMISER COLLAR
14	27947	SWIVEL, LINKAGE - ECONOMISER COLLAR
15	25996A1	SWIVEL AND LINK ROD ASSEMBLY
16	66856A1	ADAPTOR, MAGNETO
17	22-25094	FITTING, GREASE - MAGNETO ADAPTOR
18	12-27939	WASHER, MAGNETO PILOT
19	14-27960	TAB WASHER, ADAPTOR CAP FASTENING
20	13-27959	WASHER, WAVE - MAGNETO BALL BEARING TENSION
21	27955	CAP, MAGNETO ADAPTOR AND PILOT FASTENING
22	10-30110	SCREW, ADAPTOR AND PILOT TO MAGNETO
23	10-78841	SCREW, ADAPTOR AND PILOT TO CRANKCASE
24	12-20084	WASHER, ADAPTOR AND PILOT TO CRANKCASE SCREW
25	11-22053	NUT, ADAPTOR AND PILOT TO CRANKCASE SCREW
26	53458	PLATE, THROTTLE STOP
27	37-29315	DECAL, THROTTLE STOP PLATE (STOP THROTTLE STOP PLATE (STOP A
28	10-24933	SCREW, THROTTLE STOP ADJUSTING
29	11-20088	NUT, THROTTLE STOP ADJUSTING SCREW
30	26852	CAP, NYLON - ADJUSTING SCREW
31	10-69035	SCREW, THROTTLE STOP PLATE TO ADAPTOR
32	28-28657	KEY, MAGNETO DRIVING
33	29784	HUB, DRIVEN PULLY
34	29783A1	DRIVEN PULLEY ASSEMBLY
35	17-24873	ROLL PIN, FLANGE LOCATING
36	29785	FLANGE, DRIVEN PULLEY
37	12-20138	WASHER, PULLEY CLAMPING SCREW
38	10-32228	SCREW, PULLEY CLAMPING
39	20140	BELT, TIMING
40	27949	RUD, LINK - UPPER
41	11-25168	NUT, UPPER LINK ROD ADJUSTING
42	27948	SWIVEL, UPPER AND LOWER LINK RODS
43	28061	LEVER, LINKAGE - UPPER
44	27941	LEVER, LINKAGE - LOWER
45	27950	ROD, LINK - LOWER
46	27940	SHAFT, VERTICAL
47	32-35899	TUBE, VERTICAL SHAFT
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
56	84-821945A46	CABLE, HIGH TENSION LEAD - SPARK PLUG
57	25-25429	"O" RING, HIGH TENSION HEAD 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 (INTERNAL PARTS) (45 parts)

Ref	OEM Part #	Part Name
-	394-2271A2	MAGNETO ASSEMBLY, COMPLETE (4D-4)
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 G ROUND 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
25	11-29236	NUT, PRIMARY LEAD FASTENING
26	394-1106A1	HOLDER AND CAM WICK ASSEMBLY
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 SASEMBLY
37	394-1110	CLIP, SPRING
38	27-25725	GASKET, END CAP COVER
39	394-1561A2	END CAP COVER ASSEMBLY
40	394-1056A1	BRUSH AND SPRING ASSEMBLY
41	10-25517	SCREW, HIGH TENSION CABLE FASTENING
42	10-29418	SCREW, END CAP COVER TO MAGNETO COVER
43	14-29157	TAB WASHER, COVER FASTENING SCREW
44	22-996642	ELBOW, PLASTIC - MAGNETO COVER VENT

▶STARTER MOTOR, STARTER SOLENOID, RECTIFIER AND WIRING HARNES (32 parts)

Ref	OEM Part #	Part Name
1	32177A2	RECTIFIER ASSEMBLY
2	13-8M0204647	LOCKWASHER, RECTIFIER MOUNTING SCREW
3	11-21929	NUT, RECTIFIER MOUNTING SCREW
4	32-28373	SLEEVE, RECTIFIER LEADS
5	10-35400	SCREW, HARNESS AND STATOR LEADS TO RECTIFIER
6	11-8M0204718	NUT, HARNESS AND STATOR LEAD FASTENING SCREW
7	28597	BRACKET, RECTIFIER MOUNTING
8	10-21091	SCREW, RECTIFIER BRACKET TO BOTTOM COWL
9	11-24652	NUT, BRACKET MOUNTING SCREW
10	50-55601A2	STARTER MOTOR (DELCO-REMY)
11	10-22698	SCREW, STARTER MOTOR TO CRANKCASE FLANGE
12	13-8M0204647	LOCKWASHER, STARTER MOTOR MOUNTING SCREW
13	84-93389A12	WIRE, STARTER MOTOR TO STARTER SOLENOID
14	10-69035	SCREW, GROUND WIRE TO STARTER MOTOR
15	13-26992	LOCKWASHER, GROUND WIRE FASTENING SCREW
16	28016A1	GROUND STRAP ASSEMBLY
17	32445A1	STARTER SOLENOID
18	10,13-26996	LOCKWASHER, SOLENOID TERMINAL
19	10,11-68219	NUT, SOLENOID TERMINAL
20	13-8M0204647	LOCKWASHER, SOLENOID TERMINAL (5/16)
21	11-22053	NUT, SOLENOID TERMINAL - INSIDE (5/16)
22	11-26062	NUT, CAP - SOLENOID TERMINAL - OUTSIDE (5/16)
23	10-29238	SCREW, STARTER SOLENOID TO STARTER MOTOR
24	54-24836	CLAMP, HARNESS LEAD WIRE (1/4)
25	54-25231	CLAMP, HARNESS LEAD WIRE (1/8)
26	8M0084613	"D" WASHER, CLAMP FASTENING SCREW
27	10-8M0113176	SCREW, HARNESS LEAD WIRE FASTENING
28	33401	WIRING HARNESS (INTERNAL)
29	26079A2	PLATE, BACKING - WIRING HARNESS
30	10-45893	SCREW, BACKING PLATE TO BOTTOM COWL
31	24-28975	SPRING,GARTER - INTERNAL WIRING HARNESS
32	54-22783	"S" CLIP, WIRING HARNESS LEAD TO BOTTOM COWL

▶TOP COWL AND STARTER ASSEMBLY (47 parts)

Ref	OEM Part #	Part Name
1	31875	HANDLE, CHROME - TOP COWL
2	31003	HANDLE, INSIDE - TOP COWL
3	35496	PAD, BUMPER - TOP COWL HANDLE
4	10-56500	SCREW, FRONT - HANDLE TO TOP COWL (1 1/4")
5	11-8267089	NUT, FRONT HANDLE FASTENING SCREW
6	23-29561	SPACER,REAR HANDLE STUD
7	13-26992	LOCKWASHER, REAR HANDLE STUD
8	11-21825	NUT, REAR HANDLE STUD
9	12-8M0204649	WASHER, CENTER HANDLE STUD !2/3" OD)
10	12-69057	WASHER, LOWER HANDLE STUD (3/4" OD)
11	11-21825	NUT, CENTER AND LOWER HANDLE STUD
12	10-29199	SCREW, CENTER - HANDLE TO TOP COWL (1")
13	14-20165	TAB WASHER, SHEAVE SHAFT NUT
14	11-20166	NUT, SHEAVE SHAFT (LEFT HAND THREAD)
15	28967	SCREEN, VENT - TOP COWL
16	10-26668	SCREW, VENT SCREEN TO TOP COWL
17	177-2355A3	TOP COWL ASSEMBLY
18	16-20500	STUD, REAR - TOP COWL TO COVER
19	16-20353	STUD, FRONT - TOP COWL TO CRANKCASE
20	25-20116	GROMMET, CHOKE KNOB
21	23-20326	SPACER, TOP COWL STUD
22	12-20028	WASHER, TOP COWL STUD (1/16")
23	12-69057	WASHER, TOP COWL STUD (3/4" OD)
24	12-20583	WASHER, TOP COWL STUD (1/32")
25	11-8267089	NUT, TOP COWL FASTENING STUDS
26	20155	RETAINER, STARTER SPRING
27	24-29340T02	SPRING, STARTER REWING
28	23-28912	BUSHING, SPRING GUIDE
29	50-30994	SHEAVE ASSEMBL
30	30596	PAWL, STARTER
31	13-36206	WASHER, WAVE - STARTER PAWL
32	23-28919	BUSHING, NYLON - SHEAVE SHAFT SPACER
33	45477A1	SPACER, SHEAVE SHAFT
34	26179	RETAINER, WAVE WASHER
35	13-20160	WASHER, WAVE - RETAINER TENSION
37	30595	PLATE, RETAINER - STARTER PAWL
38	45477A1	SHAFT, SHEAVE
39	35391A1	TRIM MOULDING ASSEMBLY, TOP COWL
40	34433	BRACKET, TENSION - TRIM MOULDING
41	12-34434	WASHER, BRACKET FASTENING SCREW
42	10-23015	SCREW, BRACKET AND TRIM MOULDING TO TOP COWL
43	11-20110	NUT, BRACKET FASTENING SCREW
44	50-12066Q10	STARTER CABLE ASSEMBLY
45	28747	HANDLE, STARTER CABLE
46	79470A1	RETAINER, STARTER CABLE AND HANDLE
47	35880	PLATE, CABLE GUIDE SEE NOTE BELOW
48	6-32,10-358811	SCREW, DRIVE - CABLE GUIDE PLATE TO TOP COWL Comment: SEE NOTE BELOW

100-Hour / Annual Service Checklist

Regular maintenance keeps your Mercury 500 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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