Mercury 15 (4-STROKE) (9973100 THRU 0P016999) Parts & Diagrams

🔎 Mercury 15 (4-STROKE) Reference Library — Exploded parts diagrams (28 diagrams), specifications, common issues, and maintenance checklist.

The Mercury 15 (4-STROKE) is a 4-Stroke, Inline 2-Cylinder, EFI, SOHC 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, SOHC
Horsepower	15 HP
Displacement	333 cc
Bore x Stroke	61 mm x 57 mm
Spark Plug (Type & Gap)	NGK DCPR6E
Engine Oil Capacity	1.0 L (1 quart)
Recommended Engine Oil	SAE 25W-40 Synthetic Blend Mercury FC-W
Gear Case Oil Capacity	200 mL (6.8 fl oz)
Idle Speed (in gear)	850 ± 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 15 (4-STROKE):

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

Parts Diagrams & OEM Part Numbers

Expand the sections below to view detailed exploded parts diagrams and find the exact OEM replacement components for your Mercury 15 (4-STROKE).

▶Accessories (1 parts)

Ref	OEM Part #	Part Name
0	87-856556A1	SWITCH KIT

▶Bottom Cowl (22 parts)

Ref	OEM Part #	Part Name
1	4000-835416A2	BOTTOM COWL Comment: (GRAY)
2	852480	LATCH HOOK
3	10-4006731	SCREW, (M6 x 16)
4	12-8M0214930	WASHER
5	23-826618	BUSHING
6	25-828129	GROMMET
7	12-69057	WASHER, (.281 x .734 x .063)
8	25-855289T	GROMMET
9	827403	PLUG Comment: (NON-HANDLE)
10	825782F2	LEVER, Cowl Latch Comment: (GRAY)
11	10-1993735	SCREW, (M6 x 35 MM)
12	23-812707	BUSHING
13	13-12134	WASHER, Wave
14	22-8M0182334	CONNECTOR, Fuel - Brass
15	10-40011129	SCREW, (M6 x 25) Stainless Steel
16	25-18202	GROMMET
17	54-816311T	TIE STRAP, (8.00 Inches)
18	32-9912878	HOSE, (.187) (26.00 Inches Bulk) (Cut to 21 IN.)
19	826037	PLUG
20	22-813613	FITTING
21	54-816311T	TIE STRAP, (8.00 Inches)
22	37-111851	SHIFT DECAL Comment: (HANDLE)

▶Carburetor (35 parts)

Ref	OEM Part #	Part Name
-	802706A1	REPAIR KIT, Carburetor
1	3323-835382T04	CARBURETOR
2	10-809571	SCREW, (M4 x 10)
3	8095721	COVER
4	809573	GASKET
5	10-8095781	SCREW, Throttle
6	24-8095791	SPRING
7	10-811248M	SCREW, (M4 x 5)
8	802694	PLATE
9	10-8026921	SCREW, (M3 x 5)
10	45,8027011	PILOT JET,
11	19-802702	PLUG
12	802700	MAIN NOZZLE
13	25-11802M	O-RING
14	104,802701	JET, Main
15	10-8095711	SCREW, (M4 x 5)
16	8095701	VALVE, Needle
17	809569	FLOAT
18	17-11794M	PIN
19	27-802699	GASKET
20	35-802704	FILTER
21	802690T3	FLOAT BOWL ASSEMBLY
22	53-802693	RING, Retaining
23	802698	CAP
24	802697	SEAL
25	10-8095783	SCREW, Drain (M5 x 6)
26	27-802691	GASKET
27	802695	DIAPHRAGM
28	24-802696	SPRING
29	802705	COVER
30	10-802692	SCREW, (M4 x 8)
31	22-14183M	PLUG, Drain (M4 x 5)
32	27-8026911	GASKET
33	10-81758M	SCREW, (M4 x 12)
34	21-802703	CHECK VALVE

▶Clamp Bracket (35 parts)

Ref	OEM Part #	Part Name
1	1497-8796A8	BRACKET ASSEMBLY, Transom Comment: (STARBOARD)(GRAY)
2	1497-8794A10	BRACKET ASSEMBLY, Transom Comment: (PORT)(GRAY)
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)
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 Comment: HANDLE MODELS
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)
26	10-41523	SCREW, (.250-28 x 1.00)
27	96965	LEVER, STARBOARD SIDE
28	11-826709109	NUT, (.250-28)
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)
34	90901	STRAP, PORT SIDE
35	10-41523	SCREW, (.250-28 x 1.00)

▶Crankshaft, Pistons and Connecting Rods (16 parts)

Ref	OEM Part #	Part Name
-	27-835427A00	GASKET SET, Powerhead
1	400-834957	CRANKSHAFT
2	26-855680	SEAL, Oil
3	26-855681	SEAL, Oil
4	31-83496020	BEARING Comment: (BLUE)
5	600-834961T1	CONNECTING ROD
6	10-850844	BOLT, (M7 x 38)
7	12-855682	WASHER
8	700-834963T	PISTON
9	39-850846	RING, Piston
10	39-850847	RING, Piston
11	39-825839	RING, Oil
12	41-825713	PIN, Piston
13	53-82343M	CLIP
14	28-8M0057164	KEY
15	28-8M0084803	KEY

▶Cylinder Block (47 parts)

Ref	OEM Part #	Part Name
-	27-835427A00	GASKET SET, Powerhead
1	900-8M0055024	CYLINDER BLOCK
2	17-825689	PIN, Dowel
3	10-8M0101617	BOLT, (M8 x 55)
4	10-43092M	BOLT, (M6 x 14)
5	22-822644	PIPE PLUG
6	27-834952002	GASKET
7	834953T02	COVER, Exhaust
8	22-83326M	FITTING
9	855676003	THERMOSTAT, (60C/140F)
10	8M0188835	COVER
11	27-8M0177107	GASKET
12	10-82500930	BOLT, (M6 x 30)
13	8M0060022	HOSE
14	54-816311T	TIE STRAP, (8.00 Inches)
15	32-8M0108355	HOSE, (57.00 Inches Bulk) (16 IN.)
16	35-8M0162832	FILTER ASSEMBLY, Oil
17	822625	NIPPLE, (M20)
18	NSS	NOT SOLD SEPARATE, Plug-Serial Number
19	834974	BREATHER COVER
20	26-850850	SEAL
21	10-8257021	BOLT, (M6 x 20)
22	27-8354271	GASKET
23	855922A2	PLATE, Oil Deflection
24	10-40011151	SCREW, (M8 x 35) Stainless Steel
25	97-8M0099896	ANODE
26	25-855777	GROMMET
27	855776	COVER
28	10-855778	BOLT, (M5 x 12)
29	855779	PLATE
30	10-8257021	BOLT, (M6 x 20)
31	8533442	CABLE Comment: HANDLE
32	11-46335	NUT (.375) Comment: HANDLE
33	855732	BRACKET Comment: HANDLE
34	53-27290	RING, Retaining Comment: HANDLE
35	10-40011126	SCREW, (M6 x 13) Stainless Steel Comment: HANDLE
36	817428	SOCKET Comment: HANDLE
37	19-8354262	DIPSTICK
38	54-816311T	TIE STRAP, (8.00 Inches)
39	22-8830591	PIPE JOINT
40	32-896122	HOSE
41	852484	SCREEN, Oil
42	54-28700	CLAMP Comment: ELECTRIC
43	10-82239312	SCREW, (M5 x 12) Comment: ELECTRIC
44	54-8556951	CLAMP
45	54-8556961	CLAMP
46	25-855690	GROMMET

▶Cyliner Head (16 parts)

Ref	OEM Part #	Part Name
-	27-835427A00	GASKET SET, Powerhead
1	900-835430A1	CYLINDER HEAD ASSEMBLY
2	850835	GUIDE, Intake
3	53-825038	CIRCLIP
4	22-822644	PIPE PLUG
5	10-855677	BOLT, (M8 x 78)
6	17-825689	PIN, Dowel
7	10-893745025	SCREW, (M6 x 25)
8	27-8M0052705	GASKET
9	834954	COVER
10	850837	SEAL
11	10-8257021	BOLT, (M6 x 20)
12	33-827858Q	SPARK PLUG, NGK-DPR6EA-9
13	859578A1	PLUG
14	25-8M0052669	O-RING
15	NSS	NOT SOLD SEPARATE, Decal-Recomm. Eng. Oil/Valve Cle.

▶Driveshaft Housing (30 parts)

Ref	OEM Part #	Part Name
1	1506-835409T2	HOUSING, Driveshaft Comment: (LONG)(GRAY)
2	856157T	MOUNT, Upper Comment: (BIGFOOT)
3	10-8136911	SCREW, (M8 x .98)
4	826276	BUMPER
5	27-8M0204692	GASKET
6	8288181	PLUG, Drain
7	853577T	COVER
8	27-854617	GASKET
9	10-4006731	SCREW, (M6 x 16)
10	26-827947	SEAL
11	32-855252	TUBE, Water Comment: (BIGFOOT)
12	26-8272411	SEAL
13	26-413651	SEAL, Oil
14	852432	SEAL
15	856179	BRACKET
16	856196	SLEEVE
17	850862F3	COVER Comment: (PORT)(GRAY)
18	850863F3	COVER Comment: (STARBOARD)(GRAY)
19	10-814776	SCREW, Adjusting (M6 x 55)
20	11-401386	NUT, (M6)
21	8224211	BUMPER
22	25-855299	GROMMET
23	853963F2	ADAPTOR Comment: (GRAY)
24	23-12009	BUSHING, (.31 x .45 x .50) Comment: BIGFOOT
25	10-82407110	SCREW, (M8 x 50) Comment: BIGFOOT
26	10-8240717	SCREW, (M8 x 30) Comment: BIGFOOT
27	825578A1	RELIEF VALVE ASSEMBLY
28	25-825579	O-RING
29	17-82364M	PIN, Dowel
30	22-68307	PLUG

▶Electrical Components (48 parts)

Ref	OEM Part #	Part Name
-	802733A98	POWERHEAD ASSEMBLY
1	835403T	BRACKET Comment: (MANUAL)
2	54-855686	CLAMP
3	10-855810	BOLT, (M6 x 20)
4	10-8248326	BOLT, (M6 x 25)
5	12-855811	WASHER
6	25-97687M	GROMMET
7	23-852473	COLLAR
8	854650T2	RECTIFIER/REGULATOR ASSEMBLY Comment: ELECTRIC
9	10-811188T	BOLT, (M6 x 16) Comment: ELECTRIC
10	13540	CAP, Female Comment: ELECTRIC
11	84-11149A43	CABLE ASSEMBLY, Brown/White Comment: ELECTRIC
12	84-824372A1	CABLE ASSEMBLY Comment: ELECTRIC
13	8M0010250	BRACKET Comment: ELECTRIC
14	825096T01	SOLENOID Comment: ELECTRIC
15	12-827205	WASHER Comment: ELECTRIC
16	11-827204	NUT, (M6) Comment: ELECTRIC
17	13-400256	LOCKWASHER, (M6) Comment: ELECTRIC
18	11-400212	NUT, (M6) Stainless Steel Comment: ELECTRIC
19	85-826574	BOOT Comment: ELECTRIC
20	855742	LEAD WIRE Comment: ELECTRIC
21	11-94330	NUT, (.250-20) Brass Comment: ELECTRIC
22	84-859451A1	CABLE ASSEMBLY, Fuse Comment: ELECTRIC
23	88-8M0207796	FUSE, 20 Ampere Comment: ELECTRIC
24	84-95084A19	CABLE ASSEMBLY, Fuse Comment: ELECTRIC
25	84-859312T1	HARNESS ASSEMBLY, Engine Wiring Comment: ELECTRIC
26	92753	RETAINER Comment: ELECTRIC
27	84-88439A29	CABLE ASSEMBLY, Battery - Positive Comment: ELECTRIC
28	84-88439A30	CABLE ASSEMBLY, Battery - Negative Comment: ELECTRIC
29	54-816311T	TIE STRAP, (8.00 Inches)
30	84-824912A6	CABLE ASSEMBLY Comment: (HANDLE)
31	835401T1	CDI UNIT
32	10-84058M	BOLT, (M6 x 20)
33	855685T	COIL ASSEMBLY, Ignition Comment: (Includes Leads and Boots)
34	84-825102A1	HIGH TENSION LEAD
35	25-82069M	GROMMET
36	853524	SWITCH, Oil Pressure
37	NSS	NOT SOLD SEPARATE, Screw
38	853537	LEAD WIRE
39	835406	RECTIFIER/REGULATOR Comment: MANUAL
40	10-811188T	BOLT, (M6 x 16) Comment: MANUAL
41	89-853598T	SOLENOID ASSEMBLY Comment: ELECTRIC NON/HANDLE
42	853599T	BRACKET Comment: ELECTRIC NON/HANDLE
43	853601	HOOK WIRE Comment: ELECTRIC NON/HANDLE
44	10-855739	SCREW, (M5 x 8) Comment: ELECTRIC NON/HANDLE
45	25-91782M	GROMMET Comment: ELECTRIC NON/HANDLE
46	25-82258M	O-RING Comment: ELECTRIC NON/HANDLE
47	10-811188T	BOLT, (M6 x 16) Comment: ELECTRIC NON/HANDLE

▶Flywheel (11 parts)

Ref	OEM Part #	Part Name
1	11-96650M	NUT, (M16)
2	12-96651M	WASHER
3	835397	FLYWHEEL Comment: (ELECTRIC)
4	835399T	COIL, Charging
5	10-853536	BOLT, (M6 x 25)
6	855944	COIL, Lighting Comment: (ELECTRIC)
7	10-853531	BOLT, (M6 x 40) Comment: (ELECTRIC)
8	54-816311T	TIE STRAP, (8.00 Inches)
9	835395	PULSER
10	10-811188T	BOLT, (M6 x 16)
11	NSS	NOT SOLD SEPARATE, Decal-Warning Neutral

▶Fuel Pump (21 parts)

Ref	OEM Part #	Part Name
-	27-835427A00	GASKET SET, Powerhead
1	835389T02	PUMP ASSEMBLY, Fuel
2	NSS	NOT SOLD SEPARATE, Body
3	21-41888M	CHECK VALVE
4	8095613	DIAPHRAGM
5	24-8095622	SPRING
6	8095632	PLUNGER
7	24-8095623	SPRING
8	10-8095641	SCREW, (M4 x 30)
9	8095614	DIAPHRAGM
10	10-41889M	SCREW, (M3 x 5)
11	11-8237515	NUT, (M4)
12	17-8095662	PIN
13	35-80365M	FILTER
14	54-82047M	CLAMP
15	32-8M0060021	HOSE
16	10-855683	SCREW, (M6 x 25)
17	25-825478	O-RING
18	54-82047M	CLAMP
19	32-8M0053527	HOSE
20	54-83577M	CLAMP

▶Gear Housing, Driveshaft - 2.00:1 Gear Ratio (45 parts)

Ref	OEM Part #	Part Name
-	46-42089A5	PUMP KIT, Water
1	1666-8833A18	GEAR HOUSING ASSEMBLY, Basic-Gray
2	23-12009	BUSHING, (.31 x .45 x .50)
3	22-8M0058389	FITTING KIT, Magnetic, Plug Fill/Drain
4	12-191833	WASHER, Fiber
5	822244A1	SLEEVE ASSEMBLY
6	23-823944	SLEEVE
7	23-823943	BUSHING
8	10-79953Q04	SCREW KIT, (.375-16 x .250)
9	12-191833	WASHER, Fiber
10	35-421991	SCREEN
11	10-13954	SCREW, (.250-14 x .88)
12	97-42121Q02	ANODE ASSEMBLY
13	10-13954	SCREW, (.250-14 x .88)
14	26-42133	SEAL
15	43-8219251	GEAR, Pinion - 13-26
16	12-41369	WASHER
17	31-22756	BEARING, Roller
18	46-42040T5	BASE ASSEMBLY, Water Pump
19	27-192043	GASKET
20	26-33613	SEAL
21	42375	RETAINER
22	10-48408	SCREW, (#10-16 x .500)
23	25-822236	QUAD RING
24	26-413651	SEAL, Oil
25	27-19202001	GASKET, Water Pump Plate
26	32-42185A1	TUBE ASSEMBLY, Water
27	42200	FACE PLATE
28	46-42089A2	COVER ASSEMBLY
29	NSS	NOT SOLD SEPARATE, Insert
30	26-421021	SEAL
31	47-42038Q02	IMPELLER
32	28-8M0173458	KEY ASSEMBLY
33	NSS	NOT SOLD SEPARATE, Washer
34	444671	GUIDE
35	10-82684430	SCREW, (M6 x 30)
36	12-8M0204649	WASHER, (.281 x .500 x .060) Stainless Steel
37	42039	CAM
38	855281	SHIFT SHAFT Comment: (LONG)
39	11-400212	NUT, (M6) Stainless Steel
40	822419	COUPLER
41	8529941	SHIFT SHAFT (UPPER)
42	53-42389	E RING
43	45-825843	DRIVESHAFT Comment: (LONG)
44	12-822248	THRUST WASHER

▶Gear Housing, Driveshaft - 2.42:1 Gear Ratio (46 parts)

Ref	OEM Part #	Part Name
-	46-99157T2	REPAIR KIT, Water Pump
1	1665-8669A22	GEAR HOUSING ASSEMBLY, Basic-Gray
2	NSS	NOT SOLD SEPARATE, 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)
7	12-191833	WASHER, Fiber
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, Fiber
12	35-41134	SCREEN
13	11-400263	NUT, (M5)
14	31-98294A1	BEARING ASSEMBLY, Roller
15	NSS	NOT SOLD SEPARATE, Cup
16	43-854498	GEAR, Pinion - 12-29
17	11-828490	NUT
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
29	10-8248324	SCREW, (M6 x 16)
30	854503	SHIFT SHAFT
31	11-400212	NUT, (M6) Stainless Steel
32	822419	COUPLER
33	8529941	SHIFT SHAFT (UPPER)
34	45-854501	DRIVESHAFT
35	85552001	BOOT
36	93878	RETAINER
37	25-35276	O-RING, (.734 x .139)
38	25-85594	O-RING, (.239 x .174)
39	12-85091	WASHER
40	24-93007	SPRING
41	12-8M0204649	WASHER, (.281 x .500 x .060) Stainless Steel
42	17-85593	PIN, (.078 x .437)
43	85562A2	SHIFT CAM
44	17-85096	PIN, Drive
45	23-29804T	SLEEVE

▶Gear Housing, Propeller Shaft - 2.00:1 Gear Ratio (23 parts)

Ref	OEM Part #	Part Name
-	26-41365A3	SEAL KIT
1	1666-8833A18	GEAR HOUSING ASSEMBLY, Basic-Gray
2	31-821321A1	BEARING ASSEMBLY, Roller
3	NSS	NOT SOLD SEPARATE
4	43-821924A1	GEAR ASSEMBLY, Forward (13-26)
5	23-41367	BUSHING
6	813139	FOLLOWER, Cam
7	52-821930A1	CLUTCH ASSEMBLY
8	17-823951	PIN, Cross
9	24-42204	SPRING
10	44-821929	PROPELLER SHAFT
11	43-821926T1	GEAR, Reverse - 13/26
12	42144T3	CARRIER ASSEMBLY, Bearing
13	25-8M0214923	O-RING, (1.984 x .139)
14	23-821927	BUSHING
15	26-99325	SEAL
16	26-821928	SEAL, Oil
17	10-82407110	SCREW, (M8 x 50)
18	10-8240717	SCREW, (M8 x 30)
19	48-828156A12	PROPELLER, (9.00 x 9.00)
20	11-40140	NUT, (M10)
21	8219321	THRUST HUB
22	23-420911	SPACER

▶Gear Housing, Propeller Shaft - 2.42:1 Gear Ratio (28 parts)

Ref	OEM Part #	Part Name
-	26-85090A2	SEAL KIT
1	1665-8669A22	GEAR HOUSING ASSEMBLY, Basic-Gray
45	97-98432Q6	TRIM TAB
46	10-4000354	SCREW, (M8 x 30)
47	12-8M0042642	WASHER, (.323 x .563 x .063) Stainless Steel
48	31-8M0103470	BEARING ASSEMBLY, Roller
49	NSS	NOT SOLD SEPARATE, Cup
50	43-854496A1	GEAR ASSEMBLY, Forward - 12/29
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	43-854497T	GEAR, Reverse - 12/29
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	10-87810178	SCREW, (M10 x 35) Stainless Steel
67	12-43328	WASHER
68	851281	THRUST HUB ASSEMBLY
69	48-19636A10	PROPELLER
70	11-88228	PROP NUT

▶Intake (14 parts)

Ref	OEM Part #	Part Name
-	27-835427A00	GASKET SET, Powerhead
1	835385T	MANIFOLD, Intake
2	27-853525	GASKET
3	17-82364M	PIN, Dowel
4	10-853531	BOLT, (M6 x 40)
5	853526	INSULATOR
6	27-835383	GASKET
7	25-8250572	O-RING
8	835386T	SILENCER
9	37-8272822	DECAL, Warning, High Voltage
10	855781	PLATE
11	855780	COLLAR
12	10-8M0100009	BOLT, (M6 x 100)
13	32-852463	HOSE

▶Intake/Exhaust Valves (15 parts)

Ref	OEM Part #	Part Name
-	27-835427A00	GASKET SET, Powerhead
1	850838T	VALVE, Intake
2	850839T	VALVE, Exhaust
3	855959	SEAT, Valve Spring
4	24-850840	SPRING, Valve
5	822650	RETAINER
6	28-893554	KEY
7	26-822647	SEAL, Valve Stem
8	850841A1	ROCKER ARM ASSEMBLY
9	10-825046	SCREW
10	11-826150	NUT
11	850842	SHAFT, Rocker
12	825451	COLLAR
13	24-825452	SPRING
14	24-825453	SPRING

▶Oil Pump/Camshaft (16 parts)

Ref	OEM Part #	Part Name
-	27-835427A00	GASKET SET, Powerhead
1	834956	CAMSHAFT
2	25-825462	O-RING
3	27-853523	GASKET
4	10-850879	BOLT, (M6 x 35)
5	28-8M0084803	KEY
6	26-825455	SEAL, Oil
7	12-82710M	WASHER
8	43-834973T	GEAR, Driven
9	12-825498	WASHER
10	10-826957M	BOLT (M6 X 16)
11	834967A1	PUMP ASSEMBLY, Oil
12	43-8M0063224	GEAR, Drive
13	12-850843	WASHER
14	11-855679	NUT, (M28)
15	57-835392Q	TIMING BELT

▶Recoil Starter (36 parts)

Ref	OEM Part #	Part Name
-	8M0049883	RECOIL ASSEMBLY Comment: MANUAL
1	850865A1	HANDLE REST
2	8M0043417	SEAL
3	85174A1	HANDLE ASSEMBLY Comment: HANDLE MODELS
4	NSS	NOT SOLD SEPARATE, Retainer Comment: HANDLE MODELS
5	8524791	LAMP Comment: HANDLE MODELS
6	10-8147762	SCREW, (M6 x 16)
7	853541	HOUSING Comment: MANUAL
8	23-852473	COLLAR Comment: MANUAL
9	50-8527732	SHEAVE, Starter Comment: MANUAL
10	852777	PAWL Comment: MANUAL
11	24-852778	SPRING, Starter Comment: MANUAL
12	852780	DRIVEPLATE ASSEMBLY Comment: MANUAL
13	24-852778T01	SPRING, Drive Pawl Comment: MANUAL
14	24-8527782	SPRING Comment: MANUAL
15	24-8527783	SPRING, Return Comment: MANUAL
16	53-852784	CIRCLIP Comment: MANUAL
17	10-852785	BOLT Comment: MANUAL
18	25-852786	GROMMET Comment: MANUAL
19	50-12066Q10	ROPE Comment: MANUAL
20	8527881	STOPPER Comment: MANUAL
21	24-8560361	SPRING, Return Comment: MANUAL
22	24-856036	SPRING Comment: MANUAL
23	10-84058M	BOLT, (M6 x 20)
24	10-855783	BOLT, (M6 x 90)
25	12-82213M	WASHER
26	11-82390M	NUT, (M6)
27	19-858768	PLUG, Warning Light Comment: (ELECTRIC NON-HANDLE)
28	19-822513002	PLUG Comment: (ELECTRIC NON-HANDLE)
29	853541	HOUSING Comment: ELECTRIC
30	23-852473	COLLAR Comment: ELECTRIC
31	37-881865	DECAL, Caution, Start In Gear Comment: ELECTRIC
32	NSS	NOT SOLD SEPARATE, Decal-Emergency Start Procedure
33	855691	COVER
34	25-8527681	GROMMET
35	NSS	NOT SOLD SEPARATE, Decal-Servicing Referral

▶Service/Support Material (1 parts)

Ref	OEM Part #	Part Name
0	37-802740A03	DECAL SET Comment: (GRAY-BIGFOOT)

▶Starter Motor (12 parts)

Ref	OEM Part #	Part Name
1	10-4000357	SCREW, (M8 x 45)
2	12-4002317	WASHER, Bottom
3	50-859168T	STARTER MOTOR ASSEMBLY
4	10-965662	THRU BOLT
5	906432	DRIVE KIT
6	685752	PINION
7	8236391	DRIVE CAP
8	8236383	ARMATURE
9	8119012	CAP, Commutator
10	898265016	BRUSH/SPRING KIT
11	898265014	HOLDER
12	F15158	SCREW

▶Swivel Bracket (46 parts)

Ref	OEM Part #	Part Name
1	3415-822237A4	SWIVEL BRACKET Comment: (GRAY)
2	22-8M0169589	FITTING, Grease
3	22-8M0169589	FITTING, Grease
4	22-8M0169589	FITTING, Grease
5	23-855628A1	BUSHING
6	NSS	NOT SOLD SEPARATE, O-Ring
7	NSS	NOT SOLD SEPARATE, Bushing
8	NSS	NOT SOLD SEPARATE, Bushing
9	NSS	NOT SOLD SEPARATE, Washer
10	821961	ROD Comment: HANDLE
11	8165621	DISC Comment: HANDLE
12	821958A1	PLATE KIT Comment: HANDLE
13	10-40011126	SCREW, (M6 x 13) Stainless Steel Comment: HANDLE
14	821957	BRAKE PLATE Comment: HANDLE
15	12-29330	WASHER Comment: HANDLE
16	821959	HANDLE Comment: HANDLE
17	11-8M0204726	NUT, (.375-24) Comment: HANDLE
18	98830A4	HOOK ASSEMBLY, Reverse Lock
19	24-96018	SPRING
20	24-879894	SPRING Comment: HANDLE
21	53-13194	RING, Retaining Comment: HANDLE
22	17-13195	PIN Comment: HANDLE
23	12756	BRACKET Comment: HANDLE
24	24-12754	SPRING Comment: HANDLE
25	12758	LEVER Comment: HANDLE
26	53-13194	RING, Retaining Comment: HANDLE
27	10-849838	SCREW, (.375-24 x 1.25) Comment: ELECTRIC - NON-HANDLE
28	41323A03	LINK ROD ASSEMBLY Comment: ELECTRIC - NON-HANDLE
29	12-37828	WASHER, (.390 x .625 x .062) Stainless Steel Comment: ELECTRIC - NON-HANDLE
30	11-8M0204726	NUT, (.375-24) Comment: ELECTRIC - NON-HANDLE
31	96186A3	BRACKET, Ride Guide Comment: (GRAY) ELECTRIC - NON-HANDLE
32	10-1993325	SCREW, (M10 x 25 MM) Comment: ELECTRIC - NON-HANDLE
33	13-400248	LOCKWASHER, (M10) Comment: ELECTRIC - NON-HANDLE
34	854801T3	SWIVEL HEAD ASSEMBLY Comment: (GRAY)
35	858338A3	SHAFT, Reverse Lock
36	16-854819	STUD, (M10 x 1.5 x 97)
37	12-4002320	WASHER
38	11-4013610	NUT, (M10)
39	8M0039074	MOUNT
40	854729T2	COVER Comment: (STARBOARD) (GRAY)
41	854728T2	COVER Comment: (PORT) (GRAY)
42	10-19943100	SCREW, (M8 x 100)
43	10-1994360	SCREW, (M8 x 60)
44	12-36001	WASHER
45	11-400213	NUT, (M8) Stainless Steel
46	NSS	NOT SOLD SEPARATE, Decal-Serial Overlaminate

▶Throttle Linkage, Handle Models (33 parts)

Ref	OEM Part #	Part Name
1	825792	HANDLE
2	25-825781	GROMMET
3	10-82239312	SCREW, (M5 x 12)
4	10-8M0204741	SCREW, (M6 x 20) Stainless Steel
5	12-8M0214930	WASHER
6	825787A2	PULLEY ASSEMBLY
7	23-825788	BUSHING
8	11-401366	NUT, (M6)
9	882818	LINK
10	8257863	PLATFORM
11	23-825789	BUSHING
12	10-8M0204741	SCREW, (M6 x 20) Stainless Steel
13	852494A5	SHIFT SHAFT ASSEMBLY, Horizontal Comment: NON BIGFOOT
14	826063	LEVER, Interlock Comment: NON BIGFOOT
15	10-40011111	SCREW, (M5 x 35) Stainless Steel
16	24-824992	SPRING, Detent
17	24-824993	SPRING, Backing
18	824994	SPRING, Plate
19	10-82239312	SCREW, (M5 x 12)
20	8280471	STRAP
21	10-8M0204741	SCREW, (M6 x 20) Stainless Steel
22	855743	COVER Comment: ELECTRIC
23	10-8M0204741	SCREW, (M6 x 20) Stainless Steel
24	87-11083A30	SWITCH ASSEMBLY
25	8M0032846	RETAINER, Brass
26	15920Q54	LANYARD ASSEMBLY
27	54-816311T	TIE STRAP, (8.00 Inches)
28	852472	WIRE Comment: MANUAL
29	855888F	BRACKET
30	10-82239312	SCREW, (M5 x 12)
31	87-8M0052929	SWITCH ASSEMBLY Comment: ELECTRIC
32	824923	PLATE Comment: ELECTRIC
33	10-82470620	SCREW, (M3.5 x 20) Comment: ELECTRIC

▶Throttle Linkage, Non-Handle Models (37 parts)

Ref	OEM Part #	Part Name
1	826037	PLUG
2	8280471	STRAP
3	10-8M0204741	SCREW, (M6 x 20) Stainless Steel
4	10-82239312	SCREW, (M5 x 12)
5	824994	SPRING, Plate
6	24-824993	SPRING, Backing
7	24-824992	SPRING, Detent
8	852494A5	SHIFT SHAFT ASSEMBLY, Horizontal Comment: NON BIGFOOT
9	826063	LEVER, Interlock Comment: NON BIGFOOT
10	10-40011111	SCREW, (M5 x 35) Stainless Steel
11	835415F	REMOTE CONTROL PLATFORM
12	10-8M0204741	SCREW, (M6 x 20) Stainless Steel
13	852498	COVER
14	10-832047	SCREW, (M6 x 20)
15	8524961	LEVER, Shift Shaft
16	10-82239312	SCREW, (M5 x 12)
17	852497A2	SHIFT LINK ASSEMBLY
18	817428	SOCKET
19	10-32,11-45076	NUT, Brass
20	8354191	SEAL
21	850856	LEVER, Shift
22	23-91912	BUSHING
23	10-8M0204741	SCREW, (M6 x 20) Stainless Steel
24	822459	RETAINER
25	11-825677	PUSH NUT
26	850857	LEVER, Throttle
27	822459	RETAINER
28	11-825677	PUSH NUT
29	10-82129145	SCREW, (M6 x 45)
30	23-855765	BUSHING
31	828049	SLIDE
32	882817	LINK, Throttle
33	53-8237951	RING, Retaining
34	25-828114	GROMMET
35	19-855937	PLUG
36	54-28700	CLAMP Comment: ELECTRIC
37	10-82239312	SCREW, (M5 x 12) Comment: ELECTRIC

▶Tiller Handle (31 parts)

Ref	OEM Part #	Part Name
-	821468T11	TILLER ASSEMBLY Comment: (GRAY)
1	822148A3	COVER
2	822150	PULLEY
3	NSS	NOT SOLD SEPARATE, Case
4	10-878608	SCREW, (#10-16 x .500)
5	43242T09	CABLE, Throttle
6	85-9600910	SLEEVE
7	821468T9	ARM ASSEMBLY, Steering Handle Comment: (GRAY)
8	10-40011107	SCREW, (M5 x 16) Stainless Steel
9	10-40011107	SCREW, (M5 x 16) Stainless Steel
10	821972T	KNOB, Throttle
11	24-96203	SPRING
12	892995	LOCK, Throttle
13	10-8M0204707	SCREW, (M6 x 25)
14	821463T01	TILLER TUBE
15	37-8242003	DECAL
16	821465	HANDLE, Throttle
17	8M0221732	GRIP
18	87-8M0104613	SWITCH ASSEMBLY, Stop
19	822441	RETAINER
20	23-823939	BUSHING
21	12-822145	WASHER
22	13-826792	WAVE WASHER
23	12-822146	WASHER
24	822841F2	BRACKET Comment: (GRAY)
25	10-4000384	SCREW, (M10 x 80)
26	826648	PLATE
27	889734	HOUSING Comment: ELECTRIC HANDLE
28	824918	CLIP Comment: ELECTRIC HANDLE
29	87-823609A8	SWITCH ASSEMBLY Comment: ELECTRIC HANDLE
30	37-855262	DECAL Comment: ELECTRIC HANDLE

▶Tools (24 parts)

Ref	OEM Part #	Part Name
1	NSS	NOT SOLD SEPARATE, Wrench-Oil Filter (Obtain Locally)
2	91-8M0161873	HOLDER TOOL, Flywheel
3	91-83164M	FLYWHEEL PULLER
4	FT2997	COMPRESSOR TOOL, Piston Ring
5	91-83190M	STAND TOOL, Powerhead
6	91-809494A1	COMPRESSOR TOOL, Valve Spring
7	91-809495001	REMOVER TOOL, Valve Guide
8	91-809496A1	INSTALLER TOOL, Valve Guide Bushing
9	91-809497A1	REAMER TOOL, Valve Guide
10	NSS	NOT SOLD SEPARATE, jValve Seat Cutter Kit-Obtain Locally
11	91-36392	GAUGE TOOL, Carburetor
12	91-37241	PULLER PLATE
13	91-83165T	PULLER ASSEMBLY, Bearing
14	91-34569A1	PULLER ASSEMBLY, Slide Hammer
15	91-13664	INSTALLER TOOL, Bearing
16	91-824788A1	REMOVAL TOOL, Bearing
17	91-824790A1	INSTALLATION TOOL, Driveshaft Bushing
18	91-13658T	MANDREL
19	91-824787	REMOVAL TOOL, Bushing
20	91-824785T1	INSTALLER TOOL, Bushing And Seal
21	91-29310	PLATE
22	NSS	NOT SOLD SEPARATE, Expanding Rod (SNAP-ON #CG40-4)
23	NSS	NOT SOLD SEPARATE, Collet (Jaws)(SNAP-ON #CG40A6)
24	FT8950	TESTER KIT

▶Top Cowl (15 parts)

Ref	OEM Part #	Part Name
1	114-852413T4	TOP COWL ASSEMBLY Comment: (SILVER)
2	852490F	BRACKET
3	827702T	COVER
4	826649	LATCH
5	10-8231872	SCREW, (M4 x 12)
6	8,13-26995	LOCKWASHER, Stainless Steel
7	11-8237515	NUT, (M4)
8	NSS	NOT SOLD SEPARATE, Insert
9	NSS	NOT SOLD SEPARATE, Screw (#10 X .5)
10	852491A1	BRACKET ASSEMBLY
11	10-4006731	SCREW, (M6 x 16)
12	18745	ROLLER
13	8M0043391	SEAL, Cowl
14	47341A11	ROPE AND HANDLE KIT, Manual/Emergency Start
15	NSS	NOT SOLD SEPARATE, Rope

▶Visual Warning (13 parts)

Ref	OEM Part #	Part Name
1	17334A4	PLATE ASSEMBLY, Lamp Mounting
2	88-17429	LAMP
3	76424	BRACKET
4	16-55422	STUD, (#10-32 x 2.00)
5	12-24676	WASHER, (.200 x .440 x .032)
6	10-32,11-68219	NUT, Stainless Steel
7	86-45915	TERMINAL BLOCK
8	10-16324	SCREW, (#8 x .625)
9	10-878607	SCREW, (#10-16 x .375)
10	84-11149A3	CABLE ASSEMBLY
11	85-623594	INSULATOR, (2.00 Inch)
12	10-24231	SCREW, (#10-32 x .250)
13	10-32,11-27164	NUT AND LOCKWASHER,

100-Hour / Annual Service Checklist

Regular maintenance keeps your Mercury 15 (4-STROKE) running reliably season after season. Most of these tasks can be performed with basic tools and the factory service manual.

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

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

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