Mercury 350 (1812754 THRU 1960826) Parts & Diagrams

🔎 Mercury 350 Reference Library — Exploded parts diagrams (17 diagrams), specifications, common issues, and maintenance checklist.

The Mercury 350 is a 4-Stroke, V10 64-degree, Naturally Aspirated outboard motor. Designed for large center-consoles, offshore sport-fishing boats, and multi-engine configurations.

Quick Reference Specifications

Specification	Value
Engine Type	4-Stroke, V10 64-degree, Naturally Aspirated
Horsepower	350 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 SAE 25W-40 Marine Engine Oil
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 350:

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 350.

▶BOTTOM COWL ASSEMBLY (28 parts)

Ref	OEM Part #	Part Name
--	33474A1	STOP SWITCH ASSEMBLY
1	2121-2510A2	BOTTOM COWL ASSEMBLY
2	29206	COVER, PLUG - BOTTOM COWL HARNESS HOLE
3	10-46270	SCREW, PLUG COVER TO BOTTOM COWL
4	11-28656	NUT, PLUG COVER TO BOTTOM COWL SCREW
5	27-628601	GASKET, POWERHEAD TO BOTTOM COWL
6	33896	MOULDING, TRIM - BOTTOM COWL
7	10-29226	SCREW, DECORATIVE - MOULDING TO BOTTOM COWL
8	13-26995	LOCKWASHER, MOULDING FASTENING CREW
9	11-26419	NUT, MOULDING FASTENING SCREW
10	33946	BRACKET, LOCK KNOB - COWL FRONT COVER
11	10-20653	SCREW, BRACKET TO BOTTOM COWL (1")
12	10-22956	SCREW, BRACKET TO BOTTOM COWL (7/8")
13	12-27985	WASHER, BRACKET TO BOTTOM COWL SCREW
14	11-24652	NUT, BRACKET TO BOTTOM COWL SCREW
15	22-996642	ELBOW, EXHAUST COVER - TELL TALE TUBE
16	32-8M0108355	TUBE, TELL TALE _ EXHAUST COVER TO BOTTOM COWL (14 1/2")
17	22-291112	CONNECTOR, BOTTOM COWL - TELL TALE TUBE
18	33474	HARNESS, STOP SWITCH
19	12-30856	WASHER, SEALING - STOP SWITCH
20	30859	INSULATOR, SLEEVE - INNER SWITCH TERMINALS
21	24-30858A1	SPRING AND CONTRACT ASSEMBLY
22	38950A1	COVER, STOP SWITCH
23	13-21972	LOCKWASHER, STOP SWITCH CONNECTOR
24	11-21971	NUT, STOP SWITCH CONNECTOR TO BOTTOM COWL
25	54-26550	CLIP, STOP SWITCH LEADS
26	10-62568	SCREW, STOP SWITCH LEADS CLIP TO LOCK KNOB BRACKET (3/8")
27	8M0084613	"D" WASHER, STOP SWITCH LEADS CLIP SCREW

▶CARBURETOR ASSEMBLY (37 parts)

Ref	OEM Part #	Part Name
--	1395-92621	REPAIR PARTS KIT
1	1335-2472	CARBURETOR ASSEMBLY, COMPLETE (KC-8A)
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	GASLET, STRAINER COVER (LARGE)
13	1399-3938	SCREEN, FILTER
14	27-25849	GASKET, STRAINER COVER (SMALL)
15	1399-2371	COVER, STRAINER
16	27-25848	GASKET, STRAINER COVER SCREW
17	10-25822	SCREW, STRAINER COVER
18	1395-6027	SCREW, THROTTLE STOP LEVER
19	8146791	LEVER, THROTTLE STOP
20	1399-2012	SHAFT, THROTTLE
21	1399-2558	TUBE, IDLE
22	27-23180	GASKET, IDLE TUBE
23	10-23035	SCREW AND LOCKWASHER, THROTTLE SHUTTER
24	1399-2014	SHUTTER, THROTTLE
25	19-32299	WELCH PLUG, BODY CHANNEL
26	24-26890	SPRING, THROTTLE SHAFT RETURN
27	1399-2535	MAIN NOZZLE
28	10-28846	SCREW, PLUG - MAIN NOZZLE
29	1399-1465	JET, MAIN FUEL (.065)
30	27-28409	GASKET, MAIN FUEL JET
31	27-28406	GASKET, MAIN FUEL JET
32	10-28405	SCREW, PLUG - MAIN FUEL JET CHANNEL
33	1399-1713	SCREW, IDLE ADJUSTMENT
34	24-27160	SPRING, IDLE ADJUSTMENT SCREW
35	27-31402	GASKET, CARBURETOR FLANGE
36	11-29250	NUT, CARBURETOR MOUNTING STUDS

▶CARBURETOR LINKAGE (17 parts)

Ref	OEM Part #	Part Name
1	90242A1	KNOB, CHOKE ROD
2	25-20116	GROMMET, CHOKE ROD
3	33954	"S" LINK, CHOKE ROD TO CHOKE KNOB
4	10-30097	SCREW, "S" LINK TO CHOKE KNOB
5	34000	ROD, CHOKE
6	11-20110	NUT, CHOKE ROD TO "S" LINK
7	17-25391	RIVET, CHOKE ROD TO CHOKE SHUTTER
8	47804	SHUTTER, CHOKE - CARBURETOR
9	16-30172	STUD, CARBURETOR - CHOKE SHUTTER PIVOT
10	12-30164	WASHER, CHOKE SHUTTER CARBURETOR STUD
11	11-20110	NUT, CHOKE SHUTTER TO CARBURETOR STUD
12	1335-2472	CARBURETOR ASSEMBLY, COMPLETE
13	33900A1	THROTTLE LEVER ASSEMBLY
14	10-29239	SCREW, THROTTLE LEVER TO CARBURETOR
15	27711	RETAINER, CHOKE ROD SPRING
16	10-28713	SCREW, RETAINER TO CARBURETOR
17	24-28965	SPRING, TENSION - CHOKE ROD

▶CLAMP AND SWIVEL BRACKET ASSEMBLY (48 parts)

Ref	OEM Part #	Part Name
1	1427-1810A1	CLAMP BRACKET ASSEMBLY
2	22477A4	THUMB SCREW ASSEMBLY
3	12-26227	WASHER, THUMB SCREW
4	8M0041936	TUBE, TILT - CLAMP BRACKET TO SWIVEL BRACKET
5	12-52864	SHIM, CLAMP BRACKET TO SWIVEL BRACKET (.010)
6	11-858869	NUT, TILT TUBE
7	53078	CAP, PLASTIC - TILT TUBE
8	17-33985A1	SWIVEL PIN AND TOP YOKE ASSEMBLY
9	30711	BUMPER, TOP YOKE
10	10-33986	SCREW, UPPER MOUNT TO SWIVEL PIN
11	33840	BRACKET, STEERING ARM - SWIVEL PIN
12	62297	BUMPER, STEERING ARM BRACKET
13	10-69028	SCREW, STEERING ARM BRACKET TO SWIVEL PIN
14	33963	BRACKET, REMOTE STEERING
15	10-37612	SCREW, REMOTE BRACKET TO ARM BRACKET (1 1/4")
16	33969	PLATE, FRICTION - CO-PILOT (SWIVEL BRACKET)
17	10-69069	SCREW, FRICTION PLATE TO SWIVEL PIN
18	38-56267	SERIAL PLATE
19	10-25612	SCREW, DRIVE - SERIAL PLATE TO SWIVEL BRACKET
20	1455-2693A3	SWIVEL BRACKET ASSEMBLY
21	26-32911	OIL SEAL, SWIVEL BRACKET
22	22-69059	FITTING, PREASE - SWIVEL BRACKET
23	19-77633Q	LUBRICAP, SWIVEL BRACKET REASE FITTING
24	77416T1	YOKE, BOTTOM
25	12-26837	WASHER, SWIVEL PIN TO BOTTOM YORK (.065)
26	11-71956	NUT, RETAINING - SWIVEL PIN
27	20215	LEVER, TILT STOP - STARBOARD SIDE
28	26864	LEVER, TILT STOP - PORT SIDE
29	10-20217	SCREW, ANCHOR - TILT STOP LEVER
30	23-20216	SPACER, TILT STOP LEVER
31	10-29237	SCREW, RETAINING - TILT STOP LEVER
32	15-37711	SHIM, RETAINING SCREW - PORT SIDE
33	13-20846	WASHER, WAVE - RETAINING SCREW - STARBOARD SIDE
34	11-24652	NUT, ANCHOR AND RETAINING SCREW
35	10-26483	BOLT, CLAMP BRACKET TO BOAT TRANSOM
36	12-67981	WASHER, CLUMP BRACKET BOLT
37	11-8M0204646	NUT, CLAMP BRACKET BOLT
38	26903A2	REVERSE LOCK ASSEMBLY
39	56349	SHAFT, REVERSE LOCK TO SWIVEL BRACKET
40	18-45882	COTTER PIN, REVERSE LOCK TO SHAFT
41	24-29821	SPRING, REVERSE LOCK TENSION
42	17-25598	ROLL PIN, REVERSE LOCK SPRING ATTACHING
43	23026	DISC, FRICTION _ SWIVEL BRACKET
44	17-8M0026068	TILT LOCK PIN ASSEMBLY
45	23-59624	SPACER, CLAMP BRACKET STUD
46	16-59625	STUD, CLAMP BRACKET
47	13-8M0204647	LOCKWASHER, CLAMP BRACKET STUD
48	11-22053	NUT, CLAMP BRACKET STUD

▶COWLING AND FRONT COVER (20 parts)

Ref	OEM Part #	Part Name
--	92-86166Q1	GLUE, ADHESIVE - BLANKET FASTENING
1	2102-2191A3	COWL FRONT COVER ASSEMBLY
2	56848	KNOB, COWL FRONT COVER FASTENING
3	12-26702	WASHER, COVER FASTEING KNOB (NYLON)
4	12-26825	WASHER, COVER FASTENING KNOB (STEEL)
5	24-31353	SPRING, TENSION - FASTENING KNOB
6	17-29077	PIN, ROLL - TENSION SPRING TO KNOB
7	34242	BLANKET, SOUND ABSORBING - COWL FRONT COVER
8	37-37834	DECAL, COWL FRONT COVER
9	37-37835	DECAL, COWL FRONT COVER - "MERC 350"
10	2122-2512A2	WRAP AROUND COWL ASSEMBLY
11	21060	HANDLE, COWL LATCH
12	53-21058	"E" RING, COWL LATCH HINGE PIN
13	17-21057	PIN, HINGE - COWL LATCH HANDLE
14	25690	SWIVEL, COWL LATCH
15	25691	HOOK, COWL LATCH FASTENING
16	39606	BLANKET, SOUND ABSORBING - WRAP AROUND COWL
17	37-37791	DECAL, WRAP AROUND COWL - STARBOARD
18	37-37790	DECAL, WRAP AROUND COWL - PORT
19	37-37865	DECAL, WRAP AROUND COWL - REAR

▶CRANKSHAFT, PISTON AND CONNECTING ROD ASSEMBLY (21 parts)

Ref	OEM Part #	Part Name
-	39-33945	RING, PISTON (.015 OVERSIZE)
1	28-45554	KEY, FLYWHEEL
2	422-2186	CRANKSHAFT
3	533-2761A3	MAIN BEARING ASSEMBLY, VALVE TYPE
4	17-20032	DOWEL PINE, MAIN BEARING
5	10-25313	SCREW, MAIN BEARING CLAMPING
6	11-29469	NUT, MAIN BEARING CLAMPING SCREW
7	17-20032	DOWEL PIN, MAIN BEARING TO CYLINDER BLOCK
8	34-32203A1	REED SET, MAIN BEARING (MATCHED)
9	34-64632	REED STOP, MAIN BEARING REED VALVES
10	10-77280	SCREW, REED STOP MOUNTING
11	11-29469	NUT, REED STOP MOUNTING SCREW
12	611-1885A4	CONNECTING ROD ASSEMBLY Comment: SERIAL 01898816-09999999
13	10-45379	SCREW, CONNECTING ROD SCREW Comment: SERIAL 01898816-09999999
14	11-20061	NUT, CONNECTING ROD SCREW Comment: SERIAL 01898816-09999999
15	29-47897	BEARING, NEEDLE - CRANKPIN Comment: SERIAL 01898816-09999999
16	29-39656	BEARING, NEEDLE - PISTON PIN Comment: SERIAL 01898816-09999999
17	12-29681	WASHER, NEEDLE BEARING RETAINING Comment: SERIAL 01898816-09999999
18	732-2735A2	PISTON AND PISTON PIN ASSEMBLY
19	40-32118	LOCK RING, PISTON PIN
20	39-32921	RING, PISTON

▶CYLINDER BLOCK AND CRANKCASE ASSEMBLY (56 parts)

Ref	OEM Part #	Part Name
1	1130-2177A2	END CAP ASSEMBLY, UPPER
2	30-63742T	BALL BEARING, UPPER END CAP
3	25-31305	"O" RING, UPPER END CAP
4	31-33958	BEARING, ROLLER - UPPER END CAP
5	26-33995	OIL SEAL, UPPER END CAP
6	10-29198	SCREW, UPPER END CAP MOUNTING
7	15-33903A1	SHIM, UPPER END CAP TO CRANKCASE AND BLOCK
8	33899	CLAMP, HOLD DOWN RING - STATOR PLATE
9	10-32228	SCREW, HOLD DOWN RING CLAMP TO UPPER END CAP
10	24-27087	SPRING, HOLD DOWN RING CLAMP SCREW
11	838-2504A2	CYLINDER BLOCK AND CRANKCASE ASSEMBLY
12	23-26348	BUSHING, CRANKCASE
13	16-64936	STUD, CARBURETOR MOUNTING (1 3/16")
14	16-33111	STUD, CRANKCASE TO DRIVE SHAFT HOUSING (1 9/16")
15	17-23784	DOWEL PIN, CRANKCASE TO CYLINDER BLOCK
16	17-20032	DOWEL PIN, CYLINDER BLOCK TO MAIN BEARING
17	16-8M0034463	STUD, CYLINDER BLOCK TO DRIVE SHAFT HOUSING (3 7/16")
18	16-29989	STUD, CYLINDER BLOCK TO DRIVE SHAFT HOUSING (1 15/16")
19	16-34378	STUD, CYLINDER BLOCK TO DRIVE SHAFT HOUSING (2 15/16")
20	22-328022	PLUG, PIPE - WATER PRESSURE HOLE
21	33758	COVER, TRANSFER PORT
22	27-33955	GASKET, TRANSFER PORT COVER
23	10-20540	SCREW, TRANSFER PORT COVER MOUNTING
24	10-78841	SCREW, CRANKCASE TO CYLINDER BLOCK (1 1/2")
25	10-22039	SCREW, CRANKCASE TO CYLINDER BLOCK (2 3/4")
26	10-26066	SCREW, CRANCASE TO CYLINDER BLOCK (1 1/4")
27	11-29250	NUT, CRANKCASE FASTENING SCREW
28	10-98261	SCREW, MAIN BEARING LOCKING
29	14-20091	TAB WASHER, BEARING LOCKING
30	15-20085A1	SHIM, LOWER END CAP TO CRANKCASE AND BLOCK
31	1126-2187A1	END CAP ASSEMBLY, LOWER
32	21-28481A1	CHECK VALVE ASSEMBLY, LOWER AND CAP
33	26-29478	OIL SEAL, LOWER
34	26-41953	OIL SEAL, UPPER
35	30-63742T	BALL BEARING, LOWER AND CAP
36	25-20081	"O" RING, LOWER END CAP
37	10-30225	SCREW, LOWER END CAP MOUNTING
38	10-21365	SCREW, IDLE STOP - CRANKCASE
39	11-20890	NUT, IDLE STOP SCREW
40	26852	CAP, NYLON - IDLE STOP SCREW
41	27-37949	GASKET, CYLINDER BLOCK TO BAFFLE PLATE
42	37930	PLATE, BAFFLE - EXHAUSTING MANIFOLD
43	27-37956	GASKET, BAFFLE PLATE TO EXHAUST COVER
44	37936	COVER, EXHAUST MANIFOLD
45	10-28782	SCREW, MANIFOLD COVER TO CYLINDER BLOCK
46	10-21365	SCREW, SPARK ADVANCE - EXHAUST COVER
47	11-20890	NUT, SPARK ADVANCE SCREW
48	26852	CAP, NYLON - SPARK ADVANCE SCREW
49	30212	TERMINAL BLOCK, EXHAUST MANIFOLD COVER
50	10-72169	SCREW, TERMINAL BLOCK TO EXHAUST MANIFOLD COVER
51	10-62568	SCREW, HARNESS LEADS TO TERMINAL BLOCK
52	1015-2175A1	CYLINDER BLOCK COVER ASSEMBLY
53	23-26348	BUSHING, CYLINDER BLOCK COVER
54	27-33951	GASKET, CYLINDER BLOCK COVER
55	10-20653	SCREW, CYLINDER BLOCK COVER MOUNTING
56	11-8M0207775	NUT, COVER MOUNTING SCREW Comment: SERIAL 01898816-09999999

▶DRIVE SHAFT HOUSING ASSEMBLY (48 parts)

Ref	OEM Part #	Part Name
1	1554-2506A2	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	32-37727	TUBE, WATER INLET
5	26-38452	SEAL, WATER INLET TUPE Comment: SERIAL 01835754-09999999
6	12-38453	WASHER, WATER TUBE SCREW Comment: SERIAL 01835754-09999999
7	38500	RETAINER - WATER TUBE SEAL Comment: SERIAL 01835754-09999999
8	10-69069	SCREW, WATER TUBE TO BOTTOM COWL Comment: SERIAL 01835754-09999999
9	695431	TUBE, EXHAUST
10	38109	COVER, TRIM - DRIVE SHAFT HOUSING
11	10-37571	SCREW, TRIM COVER TO DRIVE SHAFT HOUSING
12	37-37837	DECAL, TRIM COVER - STARBOARD
13	37-37836	DECAL, TRIM COVER - PORT
14	27-385011	GASLET, DRIVE SHAFT HOUSING TO BOTTOM COWL
15	11-862902	NUT, POWERHEAD STUDS
16	19-32298	PLUG, PLASTIC - WATER PICK-UP SCREW HOLE
17	11-8M0204653	NUT, GEAR HOUSING TO DRIVE SHAFT HOUSING STUDS
18	18-25191	COTTER PIN, PUSH ROD TO REVERSE LOCK
19	32102	ROD, PUS - REVERSE LOCK
20	24-25122	SPRING, TENSION - PUSH ROD
21	17-24887	PIN, REVERSE LOCK LEVER
22	52920	LEVER, REVERSE LOCK
23	25305	CAP, RUBBER - UPPER MOUNT BOLT NUT
24	11-23161	NUT, UPPER MOUNT BOLT
25	12-30519	WASHER, UPPER MOUNT BOLT (3/8 ID)
26	12-30521	WASHER, RUBBER - UPPER MOUNT BOLT
27	12-30520	WASHER, UPPER MOUNT BOLT (37/64 ID)
28	79680A1	COVER, UPPER MOUNT - OUTSIDE HALF
29	79680A1	COVER, UPPER MOUNT - INSIDE HALF
30	75301	MOUNT, RUBBER - UPPER
31	24929	PACKING, "U" CUP - UPPER MOUNT COVERS
32	10-37941	SCREW, UPPER MOUNT COVER - REAR (1 3/4")
33	10-28772	SCREW, SUPPER MOUNT COVER - FRONT (1 1/2")
34	11-35888	NUT, UPPER MOUNT COVER FASTENING SCREW
35	25067	BUMPER, RUPPER - LOWER MOUNT SCREW
36	10-75284	SCREW, LOWER MOUNT (5 1/2")
37	12-28051	WASHER, LOWER MOUNT SCREW
38	12-28053	WASHER, RUBBER - LOWER MOUNT SCREW
39	75302T1	MOUNT, RUBBER - LOWER
40	12-30119	WASHER, LOWER MOUNT SCREW (1/8")
41	11-25096	NUT, LOWER MOUNT SCREW
42	22-390721	PLUG, GREASE - REVERSE LOCK HOLE
43	69592F1	CLAMP, LOWER MOUNT TO DRIVE SHAFT HOUSING
44	24-35522	SPRING, TENSION - LOWER MOUNT CLAMP
45	10-29256	SCREW, LOWER MOUNT CLAMP TO DRIVE SHAFT HOUSING
46	11-35521	NUT, LOWER MOUNT CLAMP COVER
47	35474T	COVER, LOWER MOUNT CLAMP
48	10-29722	SCREW, COVER TO LOWER CLAMP

▶FLYWHEEL ASSEMBLY AND THROTTLE CONTROL LINKAGE (32 parts)

Ref	OEM Part #	Part Name
1	11-8M0214915	NUT, FLYWHEEL
2	12-36281	WASHER, FLYWHEEL NUT
3	25-37340	"O" RING, FLYWHEEL HUB
4	28-45554	KEY, FLYWHEEL DRIVE
5	218-2241A1	FLYWHEEL ASSEMBLY, COMPLETE
6	10-35562	SCREW< FLEXIBLE PLATE TO FLYWHEEL
7	50-33000A1	RATCHET ASSEMBLY, FLYWHEEL
8	10-32417	SCREW, RATCHET TO FLYWHEEL
9	10-34290	SCREW, RACHET TO FLYWHEEL
10	13-26992	LOCKWASHER, RATCHET TO FLYWHEEL SCREW
11	398-2574A3	STATOR PLATE ASSEMBLY, COMPLETE (SEE NOTE BELOW)
12	36442A1	SHIELD ASSEMBLY, STATOR PLATE
13	10-45742	SCREW, SHIELD TO STATOR PLATE
14	13-26996	LOCKWASHER, SHIELD FASTENING SCREW
15	33904	RING, HOLD DOWN - STATOR PLATE
16	10-35400	SCREW, HOLD DOWN RING TO STATOR PLATE
17	15-33910015	SHIM, STATOR PLATE TO UPPER END CAP (.015)
18	33974	BRACKET, THROTTLE CAM
19	10-29722	SCREW, THROTTLE CAM BRACKET TO STATOR PLATE
20	34068	CAM, ADJUSTMENT - THROTTLE
21	10-31903	SCREW, ADJUSTINGG CAM TO BRACKET
22	33970	ROD, THROTTLE CONTROL
23	28232	TOGGLE BOLT, THROTTLE CONTROL ROD
24	18-26811	COTTER PIN, THROTTLE CONTROL ROD
25	33973	SWIVEL, THROTTLE CONTROL ROD TO ACTUATING LEVER
26	33842	LEVER, THROTTLE ACTUATING (UPPER)
27	33902	ROD, VERTICAL
28	12-26825	WASHER, VERTICAL ROD
29	23-22981	BUSHING, NYLON - VERTICAL ROD
30	17-25870	PIN, ROLL - VERTICAL ROD
31	33833	LEVER, THROTTLE ACTUATING (LOWER)
32	10-25781	SCREW, SET - THROTTLE ACTUATING LEVERS

▶FUEL PUMP ASSEMBLY (23 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	30275	COVER, FUEL PUMP
9	27-30276	GASKET, FUEL PUMP COVER
10	10-30274	SCREW, FUEL PUMP MOUNTING (1 3/4")
11	10-29878	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 FUEL LINE
15	32-34066	FUEL LINE, FUEL PUMP TTO ADAPTOR
16	22833	ADAPTOR, CHECK UNIT (FUEL PUMP)
17	23069	STEM, CHECK UNIT ADAPTOR
18	25-16524	"O" RING, ADAPTOR STEM
19	24-23067T	SPRING, ADAPTOR STEM
20	30188	CUP WASHER, ADAPTOR
21	10-56500	SCREW, ADAPTOR TO BOTTOM COWL
22	11-24652	NUT, ADAPTOR SCREW
23	32-34243	FUEL LINE, FUEL PUMP TO CARBURETOR (7 1/8")

▶GEAR HOUSING ASSEMBLY, COMPLETE (PAGE 1) (46 parts)

Ref	OEM Part #	Part Name
-	1626-2470A6	GEAR HOUSING ASSEMBLY, COMPLETE (STANDARD)-SEE NOTE BELOW
1	1626-2470A16	GEAR HOUSING ASSEMBLY
2	16-57934	STUD, WATER PUMP BODY AND BASE TO GEAR HOUSING
3	16-32017	STUD, GEAR HOUSING TO DRIVE SHAFT HOUSING
4	31-62091T	BEARING, ROLLER - DRIVE SHAFT
5	92815	PLATE, SUPPORT - EXHAUST TUBE
6	37721001	SEAL, EXHAUST TUBE
7	43-33843	GEAR, PINION - DRIVE SHAFT
8	14-29163	TAB WASHER, PINION GEAR FASTENING SCREW
9	10-20925	SCREW, PINION GEAR TO DRIVE SHAFT
10	56622A1	SHAFT, SHIFT - LOWER
11	53-29641	CLIP, RETAINING - SHIFT SHAFT
12	25-25439	"O" RING, SHIFT SHAFT BUSHING
13	23-46284A1	BUSHING ASSEMBLY, SHIFT SHAFT
14	26-892361	OIL SEAL, SHIFT SHAFT BUSHING
15	52918	CAM, LOWER - REVERSE LOCKING
16	52919	CAM, UPPER - REVERSE LOCKING
17	45-38466	DRIVE SHAFT (STANDARD)
18	15-20929A1	SHIM, BALL BEARING TO GEAR HOUSING
19	30-72961	BEARING, BALL - DRIVE SHAFT
20	53-29116	RING, SNAP - BALL BEARING RETAINING
21	15-20929A1	SHIM, BALL BEARING TO WATER PUMP BASE
22	27-32771	GASKET, WATER PUMP BASE TO GEAR HOUSING
23	25-26855	"O" RING, WATER PUMP BASE
24	46-39531A1	WATER PUMPB BASE ASSEMBLY
25	26-90562	OIL SEAL, WATER PUMP BASE
26	17-35973	DOWEL PIN, WATER PUMP BASE TO WATER PUMP BODY
27	27-19553	GASKET, LOWER - WATER PUMP BASE TO FACE PLATE
28	32768	PLATE, FACE - WATER PUMP BASE TO WATER PUMP BODY
29	27-19551	GASKET, UPPER - FACE PLATE TO WATER PUMP BODY
30	47-89983T	IMPELLER, WATER PUMP
31	28-8M0032837	PIN, IMPELLER DRIVE
32	46-60366Q1	WATER PUMP BODY ASSEMBLY
33	32001	INSERT, WATER PUMP BODY
34	26-32121	OIL SEAL, WATER PUMP BODY
35	13-26992	LOCKWASHER, WATER PUMP BODY AND BASE STUDS
36	11-29598	NUT, WATER PUMP BODY AND BASE FASTENING STUDS
37	26-38452	SEAL, WATER PUMP BODY TO WATER INLET TUBE
38	12-38453	WASHER, NYLON _ WATER PUMP BODY
39	25-20273	RING, RUBBER _ CENTRIFUGAL SLINGER (DRIVE SHAFT)
40	25-29619	"O" RING, UPPER - DRIVE SHAFT
41	10-29608	SCREW, REAR HOUSING FLUSHING HOLE
42	27-8M0214916	GASKET, GEAR HOUSING FLUSHING HOLE SCREW
43	26-8M0214917	SEAL, GEAR HOUSING FLUSHING HOLE
44	10-79953Q04	SCREW, GREASE FILLER AND VENT HOLE
45	12-191833	WASHER, GREASE FILLER AND VENT HOLE SCREW

▶GEAR HOUSING ASSEMBLY, COMPLETE (PAGE 2) (36 parts)

Ref	OEM Part #	Part Name
-	1626-2470A6	GEAR HOUSING ASSEMLBY, COMPLETE (STANDARD) - SEE NOTE BELOW
--	43-33844A4	REVERSE GEAR ASSEMBLY, COMPLETE
1	1626-2470A16	GEAR HOUSING ASSEMBLY(SEE PAGE 26 FOR PARTS BREAKDOWN)
46	760394	CAM, SHIFT
47	20930	FOLLOWER, CAM
48	20843	SLIDE, CROSS PIN
49	24-20254	SPRING, COMPRESSION - CAM FOLLOWER
50	15-31154A1	SHIM, BEARING CUP TO GEAR HOUSING
51	43-33844A4	FORWARD GEAR ASSEMBLY
52	31-20249	BEARING, ROLLER - FORWARD GEAR
53	31-31215A1	TAPERED ROLLER BEARING ASSEMBLY
54	31-31216	CUP, TAPERED ROLLER BEARING
55	52-32189	RATCHET, SLIDING CLUTCH
56	17-20841	PIN, CROSS - RATCHET TO PROPELLER SHAFT
57	53-20842	RING, RETAINING - CROSS PIN
58	44-32000	SHAFT, PROPELLER
59	43-33844A4	REVERSE GEAR ASSEMBLY
60	12-32004	WASHER, TRUST - REVERSE GEAR
61	30-20839T	BEARING, BALL - REVERSE GEAR
62	15-20927A1	SHIM, THRUST WASHER TO GEAR HOUSING
63	25-31986	"O" RING, BEARING CARRIER
64	53014T1	BEARING CARRIER ASSEMBLY Comment: SERIAL 01835754-09999999
65	31-20249	BEARING, ROLLER - BEARING CARRIER Comment: SERIAL 01835754-09999999
66	26-23517	OIL SEAL, BEARING CARRIER Comment: SERIAL 01835754-09999999
67	28-30281	KEY, LOCATING - BEARING CARRIER
68	12-31993	WASHER, GEAR HOUSING COVER
69	11-87763	COVER, GEAR HOUSING
70	12-25251	WASHER, BACKING - PROPELLER SHAFT (1/8)
71	38859A1	THRUST HUB AND WASHER ASSEMBLY
72	12-31992	WASHER, CUPPED - THRUST HUB
73	12-32007	WASHER< SPLINDER - PROPELLER SHAFT
74	11-82671120	NUT, PROPELLER
75	97-31640Q4	TRIM TAB, GEAR HOUSING
76	10-32470	SCREW, TRIM TAB TO GEAR HOUSING
77	11-8M0204653	NUT, DRIVE SHAFT HOUSING TO GEAR HOUSING STUD (7/16)
78	11-23161	NUT, DRIVE SHAFT HOUSING TO GEAR HOUSING STUD (3/8)

▶MISCELLANEOUS PARTS/ACCESSORIES (1 parts)

Ref	OEM Part #	Part Name
-	94-29616	SHIPPING CARTON (FUEL TANK)

▶STARTER MOTOR, STARTER SOLENOID AND WIRING HARNESS (40 parts)

Ref	OEM Part #	Part Name
1	31041	CHOKE SOLENOID, TOP COWL
2	30050	DISCONNECT, CHOKE SOLENOID TERMINALS
3	28016A1	GROUND STRAP ASSEMBLY
4	10-35194	SCREW, CHOKE SOLENOID TO TOP COWL (5/8")
5	48315A4	PLUNGER ASSEMBLY, CHOKE SOLENOID
6	12-30164	WASHER, CHOKE SOLENOID LINK
7	18-26953	COTTER PIN, CHOKE SOLENOID LINK FASTENING
8	54-22783	"S" CLIP, CHOKE SOLENOID LEADS TO TOP COWL
9	23-30438	BUSHING, NYLON - CHOKE SBHUTTER
10	30212	TERMINAL BLOCK, CYLINDER BLOCK
11	10-72169	SCREW, TERMINAL BLOCK TO CYLINDER BLOCK
12	10-62568	SCREW, WIRING HARNESS LEADS TO TERMINAL BLOCK
13	218-2242A1	FLYWHEEL ASSEMBLY, COMPLETE
14	10-35562	SCREW, FLEXIBLE PLATE TO FLYWHEEL
15	50-33000A1	RATCHET ASSEMBLY, FLYWHEEL
16	10-32417	SCREW, RATCHET TO FLYWHEEL
17	10-34290	SCREW, RATCHET TO FLYWHEEL
18	13-26992	LOCKWASHER, RATCHET TO FLYWHEEL SCREW
19	50-55601A2	STARTER MOTOR ASSEMBLY Comment: SERIAL 01900116-09999999
20	10-35213	SCREW, STARTER MOTOR TO CRANKCASE
21	26511	WIRE, STARTER MOTOR TO STARTER SOLENOID
22	10-69035	SCREW, GROUND WIRE TO STARTER MOTOR
23	13-26992	LOCKWASHER, GROUND WIRE FASTENING SCREW
24	28016A1	GROUND STRAP ASS'Y, STARTER SOLENOID AND CYLINDER BLOCK
25	32445A1	SOLENOID, STARTER
26	10-29238	SCREW, STARTER SOLENOID TO STARTER MOTOR
27	12-37998	WASHER, STARTER SOLENOID SCREW
28	10,13-26996	LOCKWASHER, STARTER SOLENOID TERMINAL
29	10,11-68219	NUT, STARTER SOLENOID TERMINAL
30	13-8M0204647	LOCKWASHER, STARTER SOLENOID TERMINAL (5/16)
31	11-22053	NUT, STARTER SOLENOID TERMINAL (5/16)
32	11-26062	NUT, CAP - STARTER SOLENOID TERMINAL - OUTSIDE (5/16)
33	34229	WIRING HARNESS (INTERNAL)
34	26079A2	PLATE, BACKING - WIRING HARNESS
35	10-45893	SCREW, BACKING PLATE TO BOTTOM COWL
36	24-28975	SPRING, GARTER - INTERNAL WIRING HARNESS
37	34228	SUPPORT, EXTERNAL WIRING HARNESS
38	10-35092	SCREW, SUPPORT TO BOTTOM COWL
39	11-24652	NUT, SUPPORT FASTENING SCREW
40	54-22740	CLIP, WIRING HARNESS LEADS

▶STATOR PLATE ASSEMBLY (36 parts)

Ref	OEM Part #	Part Name
-	398-2574A3	STATOR PLATE ASSEMBLY, COMPLETE (SEE NOTE BELOW)
1	398-2221	STATOR PLATE AND CORE
2	398-2568T1	COIL ASSEMBLY
3	398-2321	CLIP, COIL RETAINING
4	398-2413	CLIP, COIL RETAINING
5	398-2207	FELT, CAM - BREAKER
6	398-732	CLIP, GROUND WIRE LEAD
7	10-21130	SCREW, GROUND TERMINAL
8	398-2203	CONDENSER ASSEMBLY
9	10-38395	SCREW, CONDENSER FASTENING (1 1/4")
10	10-38395	SCREW, CONDENSER FASTENING (1 1/4")
11	13-21134	LOCKWASHER, CONDENSER FASTENING SCREW
12	12-21135	WASHER, CONDENSER FASTEING SCREW
13	54-39844A1	CLAMB, LEAD WIRE
14	12-21135	WASHER, LEAD WIRE CLAMP SCREW
15	13-21134	LOCKWASHER, LEAD WIRE CLAMP SCREW
16	11-21923T	NUT, LEAD WIRE CLAMP SCREW
17	11-21825	NUT, COIL LEAD WIRE CLIP SCREW (SPACER)
18	54-24836	CLIP, NYLON - COIL LEAD WIRE
19	8M0084613	"D" WASHER, COIL LEAD WIRE CLIP
20	13-26995	LOCKWASHER, COIL LEAD WIRE CLIP SCREW
21	11-26419	NUT, COIL LEAD WIRE CLIP SCREW
22	398-2202	BREAKER ASSEMBLY
23	10-33988	SCREW AND LOCKWASHER, BREAKER FASTENING
24	12-21135	WASHER, TERMINAL SCREW
25	13-21134	LOCKWASHER, TERMINAL SCREW
26	11-21923T	NUT, TERMINAL SCREW
27	398-2206	GROUND LEAD, STATOR TO TERMINAL BLOCK
28	23-30419	SLEEVE, INSULATION - GROUND LEAD
29	84-821945A46	LEAD WIRE
30	84-821945A46	LEAD WIRE - TOP
31	85-63709A1	PROTECTOR, SPARK PLUG
32	20117	MARKER, "TOP" - LEAD WIRE
33	33-813416	SPARK PLUG, (CHAMPION J6J)
34	398-2208	COVER, DUST - STATOR PLATE
35	10-36455	SCREW, DUST COVER TO STATOR PLATE

▶THROTTLE AND SHIFT LINKAGE (49 parts)

Ref	OEM Part #	Part Name
1	2121-2510A2	BOTTOM COWL ASSEMBLY (SEE PAGE 18 FOR PARTS BREAKDOWN)
2	20557	BRACKET, CABLE END ANCHOR
3	10-29200	SCREW, CABLE END ANCHOR BRACKET TO BOTTOM COWL
4	21968	STOP BLOCK, THROTTLE LEVER
5	10-28636	SCREW, STOP BLOCK TO BOTTOM COWL
6	12-21967	WASHER, STOP BLOCK TO BOTTOM COWL SCREW
7	33833	LEVER, THROTTLE ACTUATING - BOTTOM COWL
8	27947	SWIVEL, THROTTLE CONTROL
9	33898	ROD, THROTTLE CONTROL
10	11-25168	NUT, ADJUSTING - THROTTLE CONTROL ROD
11	33953	ROD (SLEEVE), THROTTLE CONTROL ROD TO THROTTLE CONTROL LEVER
12	12-20583	WASHER, THROTTLE CONTROL LEVER
13	18-210711	COTTER PIN, THROTTLE CONTROL LEVER
14	33835	LEVER, THROTTLE CONTROL
15	10-29246	SCREW, THROTTLE CONTROL LEVER TO BOTTOM COWL
16	12-38832	WASHER, THROTTLE CONTROL LEVER FASTENING CREW
17	23-33906	SPACER, THROTTLE CONTROL LEVER FASTENING SCREW
18	23-65830	BUSHING, THROTTLE CONTROL LEVER TO BOTTOM COWL
19	12-21273	WASHER, THROTTLE CONTROL LEVER FASTENING SCREW
20	17-30978A1	PIN ASSEMBLY, CLEVIS YOKE
21	17-239281	ROLL PIN, CLEVIS YOKE PIN
22	10-20584	SCREW, CLEVIS YOKE PIN FASTENING
23	13-29402	WASHER, WAVE - CLEVIS YOKE PIN FASTENING SCREW
24	11-8M0204718	NUT, CLEVIS YOKE PIN FASTENING SCREW
25	33901A1	SHIFT SHAFT ASSEMBLY, UPPER
26	24-30621	SPRING, DETENE - SHIFT SHAFT
27	10-98256	SCREW, DETENT SPRING TO BOTTOM COWL
28	12-69057	WASHER, DETENT SPRING FASTENING SCREW
29	11-20013	NUT, DETENT SPRING FASTENING SCREW
30	33837	ROD, THROTTLE STOP CONTROL
31	11-25168	NUT, ADJUSTING - THROTTLE STOP CONTROL ROD
32	33953	ROD (SLEEVE), THROTTLE STOP CONTROL ROD TO THROTTLE STOP LEV
33	12-20583	WASHER, THROTTLE STOP LEVER
34	18-210711	COTTER PIN, THROTTLE STOP LEVER
35	33834	LEVER, THROTTLE STOP
36	10-34438	SCREW, THROTTLE STOP LEVER TO BOTTOM COWL (2 3/8")
37	12-34437	WASHER, THROTTLE STOP LEVER FASTENING SCREW
38	23-34440	BUSHING, THROTTLE STOP LEVER FASTENING SCREW
39	11-29250	NUT, THROTTLE STOP LEVER FASTENING SCREW
40	23-34103	BUSHING, THROTTLE STOP LEVER FASTENING SCREW
41	33841	LEVER, SHIFT CONTROL
42	10-47273	SCREW, SHIFT CONTROL LEVER TO BOTTOM COWL
43	12-8M0042641	WASHER, SHIFT CONTROL LEVER FASTENING SCREW
44	23-29529	BUSHING, SHIFT CONTROL LEVER FASTENING SCREW
45	33953	ROD (SLEEVE), SHIFT CONTROL END
46	11-25168	NUT, ADJUSTING - SHIFT SHAFT END
47	33982	ROD, LINK - SHIFT SHAFT END
48	12-20583	WASHER, SHIFT CONTROL END ROD
49	18-210711	COTTER PIN, SHIFT CONTROL END ROD

▶TOP COWL AND STARTER ASSEMBLY (46 parts)

Ref	OEM Part #	Part Name
1	2100-2172A2	TOP COWL ASSEMBLY
2	25-20116	GROMMET, CHOCK KNOB
3	16-20353	STUD, FRONT AND REAR - TOP COWL TO CYLINDER BLOCK
4	12-20028	WASHER, TOP COWL STUD (1/16")
5	12-69057	WASHER, TOP COWL STUD (3/4"OD)
6	12-20583	WASHER, TOP COWL STUD (1/32")
7	11-8267089	NUT, TOP COWL FASTENING STUD
8	20155	RETAINER, STARTER SPRING
9	24-29340T02	SPRING, STARTER REWIND
10	23-28912	BUSHING, SPRING GUIDE
11	50-30994	SHEAVE ASSEMBLY
12	30596	PAWL, STARTER
13	13-36206	WASHER, WAVE - STARTER PAWL
14	23-28919	BUSHING, NYLON - SHEAVE SHAFT SPACER
15	45477A1	SPACER, SHEAVE SHAFT
16	26179	RETAINER, WAVE WASHER
17	12-26180	WASHER, WAVE WASHER RETAINER
18	13-20160	WASHER, WAVE - RETAINER TENSION
19	30595	PLATE, RETAINER - STARTER PAWL
20	45477A1	SHAFT, SHEAVE
21	34735A1	TRIM MOLDING ASSEMBLY, TOP COWL
22	34433	BRACKET, TRIM MOULDING TENSION
23	10-37892	SCREW, BRACKET AND MOULDING TO TOP COWL
24	12-34434	WASHER, BRACKET AND MOULDING TO TOP COWL SCREW
25	11-20110	NUT , BRACKET AND MOULDING TO TOP COWL SCREW
26	50-12066Q10	STARTER CABLE ASSEMBLY
27	28747	HANDLE, STARTER CABLE
28	79470A1	RETAINER, STARTER CABLE AND HANDLE
29	30045	PLATE, ROPE GUIDE
30	10-28642	SCREW, DRIVER - ROPE GUIDE PLATE TO TOP COWL
31	14-20165	TAB WASHER, SHEAVE SHAFT NUT
32	11-20166	NUT, SHEAVE SHAFT (LEFT HAND THREAD)
33	33952	SCREEN, VENT - TOP COWL
34	10-35193	SCREW, VENT SCREEN TO TOP COWL
35	31875	HANDLE, CHROME - TO COWL
36	31003	HANDLE, INSIDE - TOP COWL
37	10-56500	SCREW, FRONT - HANDLE TO TOP COWL (1 1/4")
38	11-8267089	NUT, FRONT HANDLE FASTENING SCREW
39	35496	PAD, 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	10-29199	SCREW, CENTER - HANDLE TO TOP COWL (1")
44	23-29561	BUSHING, REAR HANDLE STUD
45	13-26992	LOCKWASHER, REAR HANDLE STUD
46	11-21825	NUT, REAR HANDLE STUD

100-Hour / Annual Service Checklist

Regular maintenance keeps your Mercury 350 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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