Mercury 18XD (7209533 THRU 0A730006) Parts & Diagrams

🔎 Mercury 18XD Reference Library — Exploded parts diagrams (24 diagrams), specifications, common issues, and maintenance checklist.

The Mercury 18XD is a 2-Stroke, 2-Cylinder outboard motor. A popular choice for small fishing boats, inflatable RIBs, and sailboat auxiliaries.

Quick Reference Specifications

Specification	Value
Engine Type	2-Stroke, 2-Cylinder
Horsepower	18 HP
Displacement	262 cc
Bore x Stroke	56 mm x 50 mm
Spark Plug (Type & Gap)	NGK BPZ8HS-15
Engine Oil Capacity	Pre-mix (50:1)
Recommended Engine Oil	Quicksilver Premium 2-Cycle TC-W3
Gear Case Oil Capacity	379 mL (12.8 oz)
Idle Speed (in gear)	750 ± 50 RPM (in gear)
Full Throttle RPM Range	4500-5500
Fuel	Unleaded Gasoline, 87 Octane min.

Always verify specifications against your owner's manual for your specific serial number range.

Common Issues & Recommended Parts

Below are common maintenance scenarios for the Mercury 18XD:

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 18XD.

▶BLOCK(US-0B114230/Can-0A719660/Bel-9467987 and Below) (39 parts)

Ref	OEM Part #	Part Name
-	27-41499A88	GASKET SET
1	872-9533T38	CYLINDER BLOCK ASSEMBLY
2	17-85171	PIN, Dowel, CYLINDER BLOCK
3	22-15133	ELBOW, BLEED HOSE (45 DEG.)
4	32-892024122	TUBING, (20.00 Feet Bulk), BLEED (12-1/4")
5	16-429173	STUD, CARBURETOR
6	10-40001209	SCREW, (M10 x 60), CRANKCASE TO CYLINDER BLOCK
7	27-892158	GASKET, EXHAUST MANIFOLD
8	92329	MANIFOLD, Exhaust
9	27-414991	GASKET, SCHAUST COVER
10	92330T	COVER, ECHAUST
11	10-4000333	SCREW, (M6 x 40)
12	144071	COVER, TRANSFER PORT
13	25-822370	O-RING, TRANSFER PORT COVER
14	10-40057107	SCREW, (M5 x 16), COVER TO CYLINDER BLOCK
15	1028-8283A1	COVER ASEMBLY, CYLINDER BLOCK
16	10-4000331	SCREW, (M6 x 30), COVER ATTACHING
17	27-86389	GASKET, CYLINDER BLOCK COVER
18	22-996642	ELBOW, TELL TALE HOSE
19	32-8M0108355	HOSE, TELL TALE (8")
20	22-94848	FITTING, TELL TALE HOSE - BOTTOM COWL
21	14406	COVER, TRANSFER PORT
22	25-86391	O-RING, TRANSFER PORT COVER
23	10-40057107	SCREW, (M5 x 16), COVER TO CYLINDER BLOCK
24	92350	COVER, TRANSFER PORT
25	25-8M0214925	O-RING, TRANSFER PORT COVER
26	10-40057107	SCREW, (M5 x 16), COVER TO CYLINDER BLOCK
27	14112T	REED BLOCK
28	85977002	SEAL, Rubber, REED BLOCK
29	27-414172	GASKET, REED BLOCK
30	34-816806	REED
31	34-897931	STOP, Reed
32	10-4005785	SCREW, (M4 x 10), REED ATTACHING
33	27-414181	GASKET, ADAPTOR PLATE
34	41420A3	PLATE, ADAPTOR - CARBURETOR
35	22-56759	FITTING, Barbed, ADAPTOR PLATE - BLEED HOSE
36	10-40019108	SCREW, (M5 x 20), PLATE TO REED BLOCK
37	11-400213	NUT, (M8) Stainless Steel, CARBURETOR STUD
38	10-85577	SEAL, TRANSFER PORT COVER

▶BLOCK(US-0B114231/Can-0A719661/Bel-9467988 and Up) (44 parts)

Ref	OEM Part #	Part Name
-	27-41499A88	GASKET SET
1	872-9533T39	CYLINDER BLOCK ASSEMBLY
2	17-85171	PIN, Dowel, CYLINDER BLOCK
3	22-15133	FITTING, BLEED HOSE (45 DEG.)
4	32-892024122	TUBING, (20.00 Feet Bulk), BLEED (12-1/4")
5	16-429173	STUD, CARBURETOR
6	10-40001209	SCREW, (M10 x 60), CRANKCASE TO CYLINDER BLOCK
7	27-892158	GASKET, EXJAUST MANIFOLD
8	92329F03	MANIFOLD, Exhaust
9	27-892157	GASKET, EXHAUST COVER
10	923301	COVER, EXHAUST
11	10-4000333	SCREW, (M6 x 40)
12	144071	COVER, TRANSFER PORT
13	25-822370	O-RING, TRANSFER PORT COVER
14	10-40057107	SCREW, (M5 x 16), COVER TO CYLINDER BLOCK
15	1028-8282A1	COVER ASEMBLY, CYLINDER BLOCK
16	10-4000331	SCREW, (M6 x 30), COVER ATTACHING
17	27-863895	GASKET, CYLINDER BLOCK COVER
18	22-996642	ELBOW, TELL TALE HOSE
19	32-8M0108355	HOSE, TELL TALE (8")
20	22-94848	FITTING, TELL TALE HOSE - BOTTOM COWL
21	14406	COVER, TRANSFER PORT
22	25-86391	O-RING, TRANSFER PORT COVER
23	10-40057107	SCREW, (M5 x 16), COVER TO CYLINDER BLOCK
24	14408	COVER, TRANSFER PORT
25	25-26722	O-RING, TRANSFER PORT COVER
26	10-40057107	SCREW, (M5 x 16), COVER TO CYLINDER BLOCK
27	14112T	REED BLOCK
28	85977002	SEAL, Rubber, REED BLOCK
29	27-414172	GASKET
30	34-816806	REED
31	34-897931	STOP, Reed
32	10-4005785	SCREW, (M4 x 10), REED ATTACHING
33	27-414181	GASKET, ADAPTOR PLATE
34	41420A3	PLATE, CARBURETOR
35	22-56759	FITTING, Barbed, ADAPTOR PLATE - BLEED HOSE
36	10-40019108	SCREW, (M5 x 20), PLATE TO REED BLOCK
37	11-400213	NUT, (M8) Stainless Steel, CARBURETOR STUD
38	143171	COVER, THERMOSTAT
39	27-14318005	GASKET, THERMOSTAT COVER
40	10-4000333	SCREW, (M6 x 40)
41	14586	THERMOSTAT
42	54-12627	STRAP
43	27-8M0204714	GASKET, THERMOSTAT

▶CARBURETOR(WMC-13/13A/14/14A/15/15A/16/16A) (28 parts)

Ref	OEM Part #	Part Name
1	766-848389A4	PISTON ASSEMBLY Comment: (25-ELECTRIC-WMC16A)
2	1395-9646	VALVE, Throttle Comment: (25)
3	1395-9695	SHAFT, Throttle Comment: (WMC-13A/14A15A/16A)
4	1395-9164	BOWL, Fuel
5	1395-91691	FLOAT
6	1395-803861	VALVE, INLET NEEDLE
7	1395-6201	JET, (.080) Comment: (25)
8	1395-9171	PLUG, JET RETAINER
9	813618	COVER, DIAPHRAGM
10	1395-9697	SCREW, DIAPHRAGM COVER Comment: (WMC-13A/14A/15A/16A)
11	15827A1	BODY, FUEL PUMP
12	1395-9643	SCREW, FUEL PUMP COVER
13	1395-9637	COVER, FUEL PUMP
14	1395-879194017	PLUG
15	1395-97611	GASKET/DIAPHRAGM KIT
16	1395-8237072	REPAIR PARTS KIT
17	1395-9177	PLATE Comment: 25-MANUAL-WMC-15)
18	1395-823433	CHOKE, Electric Comment: (WMC-14A/WMC-16A)
19	1395-9696	SCREW Comment: (WMC-13A/14A/15A/16A)
20	27-192061	GASKET, CARBURETOR
21	41717T	BRACKET, PRIMER
22	10-400018	SCREW, (M5 x 12), BRACKET TO CARBURETOR
23	42515A1	LEVER ASSEMBLY, FAST IDLE
24	41703	LEVER, PRIMER
25	12733	IDLE WIRE
26	110242	ACTUATOR, PRIMER
27	12654	INSTRUCTION PLATE Comment: (MERCURY)
28	12653	INSTRUCTION PLATE Comment: (MARINER)

▶CARBURETOR(WMC-9/10/11/12/24/25/26/27) (30 parts)

Ref	OEM Part #	Part Name
-	27-41499A88	GASKET SET
1	1390-8677A11	CARBURETOR Comment: (25-ELECTRIC-WMC-27)
2	1395-9646	VALVE, Throttle Comment: (25-WMC-26/27)
3	1395-9695	SHAFT, Throttle
4	1395-9164	BOWL, Fuel
5	1395-91691	FLOAT
6	1395-803861	VALVE, INLET NEEDLE
7	1395-6201	JET, (.080) Comment: (25)
8	1395-9171	PLUG, JET RETAINER
9	813618	COVER, DIPHRAGM
10	1395-9697	SCREW, DIAPRAGM COVER
11	1395-9702	COVER, FUEL PUMP
12	1395-9173	SCREW, FUEL PUMP COVER
13	1395-9177	PLATE, COVER (MANUAL)
13A	1395-823433	CHOKE, Electric
14	1395-9696	SCREW, COVER PLATE
15	1395-97611	GASKET/DIAPHRAGM KIT
16	1395-8237072	REPAIR PARTS KIT Comment: (WMC-24/25/26/27)
16A	1395-879194017	PLUG
17	27-192061	GASKET, CARBURETOR
18	41717T	BRACKET, PRIMER
19	10-400018	SCREW, (M5 x 12), BRACKET TO CARBURETOR
20	42515A1	LEVER ASSEMBLY, FAST IDLE
21	41703	LEVER, PRIMER
22	12733	IDLE WIRE
23	110241	ACTUATOR, PRIMER
24	11043	KNOB, FAST IDLE - EARLY MARINER MODELS
25	25-627021	O-RING, (.301 x .070) Comment: EARLY MARINIER MODELS
26	12654	INSTRUCTION PLATE Comment: (MERCURY)
27	12653	INSTRUCTION PLATE Comment: (MARINER)

▶CLAMP BRACKET ASSEMBLY (27 parts)

Ref	OEM Part #	Part Name
1	1497-8794A2	CLAMP BRACKET Comment: (PORT)(MARINER)
2	1497-8794A6	CLAMP BRACKET Comment: (STARBOARD)(MARINER)
3	10-92767A1	THUMB SCREW ASSEMBLY, (14 mm)
4	12-73719	WASHER, THUMB SCREW
5	10-768042	SCREW, WASHER ATTACHING
6	41042	HANDLE, CARRYING
7	17-99929A1	PIN ASSEMBLY, Tilt
8	16-99928	STUD, CLAMP BRACKET
9	23-41041	SPACER, CLAMP BRACKET STUD
10	11-400213	NUT, (M8) Stainless Steel, CLAMP BRACKET STUD
11	8M0035075	TILT TUBE
12	54-8M0085928	CLIP, SAFETY
13	11-93164	NUT, (.875), TILT TUBE
14	10-69064	BOLT, (.312-18 x 2.750), CLAMP BRACKET TO TRANSOM
15	12-67981	WASHER, CLAMP BRACKET BOLT
16	11-82670910	NUT, (.312-18), CLAMP BRACKET BOLT
17	96965	LEVER, TILT STOP - STARBOARD SIDE
18	10-41523	SCREW, (.250-28 x 1.00), LEVER TO SWIVEL BRACKET
19	11-36069	NUT, TILT STOP LEVER SCREW
20	10-41524	SCREW, (.250-28 x 1.75), LEVER TO CLAMP BRACKET
21	24-44581	SPRING, TILT STOP LEVER SCREW
22	90901	STRAP, TILT STOP - PORT SIDE
23	10-41523	SCREW, (.250-28 x 1.00), STRAP TO SWIVEL BRACKET
24	11-36069	NUT, TILT STOP STRAP SCREW
25	10-41524	SCREW, (.250-28 x 1.75), STRAP TO CLAMP BRACKET
26	13-31030	WAVE WASHER, TILT STOP STRAP SCREW
27	12-71421	WASHER, Nylon, TILT TUBE

▶COWLS(MARINER) (20 parts)

Ref	OEM Part #	Part Name
1	2190-9163A8	TOP COWL ASSEMBLY
2	43515	HINGE, COWL LATCH
3	43555	BRACKET, TOP COWL
4	10-400018	SCREW, (M5 x 12), HINGE TO TOP COWL
5	44311F2	SHIELD, TOP COWL
6	12-73288	WASHER, SHIELD SCREW
7	2176-9107A4	BOTTOM COWL, PORT Comment: (LIGHT GRAY)
8	2176-9108A3	BOTTOM COWL, STARBOARD
9	15865	PLATE, BOTTOM COWL
10	10-95700	SCREW, (#10-16 x .500), PLATE TO BOTTOM COWL
11	15067A1	SEAL, BOTTOM COWL
12	43514	LATCH, BOTTOM COWL
13	10-400018	SCREW, (M5 x 12), LATCH TO BOTTOM COWL
14	43554A4	LATCH, COWL-REAR
15	10-400018	SCREW, (M5 x 12), BRACKET TO BOTTOM COWL
16	11281	COVER, FUEL INLET
17	25-416051	PLATE, BOTTOM COWL Comment: (WITH STOP SWITCH)(LIGHT GRAY)
18	87-11083A6	SWITCH ASSEMBLY, Stop
19	8M0032846	RETANER, STOP SWITCH
20	15920Q54	LANYARD ASSEMBLY

▶COWLS(MERCURY) (18 parts)

Ref	OEM Part #	Part Name
1	2190-9163A22	TOP COWL ASSEMBLY
2	43515	HINGE, COWL LATCH
3	43555	BRACKET, TOP COWL
4	10-400018	SCREW, (M5 x 12), HINGE TO TOP COWL
5	2176-9107A2	BOTTOM COWL ASSEMBLY, PORT
6	2176-9108A1	BOTTOM COWL ASSEMBLY, STARBOARD
7	15865	PLATE, BOTTOM COWL
8	10-95700	SCREW, (#10-16 x .500), PLATE TO BOTTOM COWL
9	15067A1	SEAL, BOTTOM COWL
10	43514	LATCH, BOTTOM COWL
11	10-400018	SCREW, (M5 x 12), LATCH TO BOTTOM COWL
12	43554A5	LATCH, COWL-REAR
13	10-400018	SCREW, (M5 x 12), BRACKET TO BOTTOM COWL
14	11281	COVER, FUEL INLET
15	25-416041	PLATE, BOTTOM COWL Comment: (WITH STOP SWITCH)
16	87-11083A6	SWITCH ASSEMBLY, Stop
17	8M0032846	RETANER, STOP SWITCH
18	15920Q54	LANYARD ASSEMBLY

▶CRANKSHAFT, PISTONS AND FLYWHEEL (22 parts)

Ref	OEM Part #	Part Name
-	879732T89	POWERHEAD ASSEMBLY
1	258-859232T15	FLYWHEEL ASSEMBLY
2	10-97359A1	SCREW ASSEMBLY
3	12-86496	WASHER, FLYWHEEL SCREW
4	43-99301	RING GEAR, FLYWHEEL Comment: (ELECTRIC)
5	10-88190313	SCREW, (M5 x 13), RING GEAR TO FLYWHEEL Comment: (ELECTRIC)
6	464-8978T2	CRANKSHAFT ASSEMBLY
7	822445A1	SEAL, CRANKSHAFT
8	26-85107	SEAL, Oil, CRANKSHAFR-LOWER
9	31-85113T	BEARING, Roller, CRANKSHAFT - LOWER
10	31-85114T	BEARING, Roller - Upper, CRANKSHAFT
11	26-859741	SEAL, Oil, CRANKSHAFT - UPPER
12	86992A5	BEARING ASSEMBLY, CENTER MAIN
13	28-20094	KEY, Woodruff, FLYWHEEL DRIVE
14	767-9104T19	PISTON ASSEMBLY Comment: SN# US-0B114231/Can-0A719661/Bel-9467988 & Up
15	40-828119	LOCK RING, PISTON PIN
16	39-8M0083677	RING SET, Piston
17	630-8835A4	CONNECTING ROD ASSEMBLY
18	29-98295	BEARING, Needle, PISTON END
19	12-8M0012294	BEARING, LOCATING - NEEDLE BEARING
20	31-879877A1	BEARING ASSEMBLY, Roller
21	10-4008225	SCREW, (M6 x 25), CONNECTING ROD

▶DRIVESHAFT HOUSING ASSEMBLY (19 parts)

Ref	OEM Part #	Part Name
-	27-41499A88	GASKET SET
1	99702A7	ADAPTOR PLATE ASSEMBLY Comment: (20/25)
2	96248A1	HOUSING ASSEMBLY, WATER TUBE
3	26-25329	SEAL, WATER TUBE
4	23-889715	SPACER, WATER TUBE
5	10-400035	SCREW, (M5 x 16), HOUSING TO ADAPTOR PLATE
6	27-41670006	GASKET, ADAPTOR PLATE
7	158662	SEAL, Adaptor Plate
8	41211	BRACKET, UPPER MOUNT
9	10-40007128	SCREW, (M6 x 20), UPPER MOUNT BRACKET
10	12-8M0204649	WASHER, (.281 x .500 x .060) Stainless Steel, UPPER MOUNT BRACKET
11	32-86292	TUBE, Water Comment: (LONG SHAFT)
12	1588-9098A6	HOUSING ASSEMBLY, Driveshaft Comment: (LONG SHAFT)(MARINER)
13	27-433374	GASKET, DRIVERSHAFT HOUSING
14	14534	COVER, IDLE RELIEF
15	27-14621	GASKET, COVER
16	10-14742	SCREW, (.250-20 x 1.25), COVER
17	10-1993870	SCREW, DRIVE SHAFT HOUSING TO PLATE (60MM)
18	12-4002317	WASHER, DRIVE SHAFT HOUSING SCREW

▶ELECTRIC COMPONENTS (28 parts)

Ref	OEM Part #	Part Name
1	8M0058226	RECTIFIER ASSEMBLY
2	10-48409	SCREW, (#10-16 x .625) Stainless Steel, RECTIFIER TO CYLINDER BLOCK
3	10-32,11-45076	NUT, Brass, RECTIFIER TERMINALS
4	89-8M0185149	SOLENOID ASSEMBLY, Starter
5	10-4000327	SCREW, (M6 x 14)
6	8-32,11-26419	NUT, Brass, STARTER SOLENOID TERMINAL
7	11-64015	NUT, (.250-20), STARTER SOLENOID TERMINAL
8	84-88809A5	WIRE ASSEMBLY, YELLOW
9	84-88439A28	CABLE ASSEMBLY, Battery, BLACK
10	84-92436A5	HARNESS ASSEMBLY, ENGINE
11	88-95085	FUSE
12	92439	BRACKET, WIRING HARNESS
13	10-4000327	SCREW, (M6 x 14), BRACKET
14	11-401386	NUT, (M6), BRACKET SCREW
15	54-815504310	CLAMP, WIRING HARNESS
16	54-8M0024808	J CLIP, WIRING HARNESS
17	86704A10	STATOR ASSEMBLY, AUXILIARY
18	10-4000123	SCREW, (M5 x 30), STATOR ATTACHING
19	50-8M0033984	STARTER MOTOR ASSEMBLY
20	96561	DRIVE KIT
21	96562	DRIVE
22	96563T	END CAP
23	96565	ARMATURE
24	96564T	END CAP, CUMMUTATOR W/SPRINGS AND BRUSHES
25	10-96566	THRU BOLT
26	10-421251	SCREW, (M8 x 55), STARTER MOTOR ATTACHING
27	25-416042	PLATE, BOTTOM COWL Comment: (MARINER)
28	25-93527002	GROMMET, BOTTOM COWL (RUBBER)

▶ELECTRICAL - BELGIUM ENGINES (10 parts)

Ref	OEM Part #	Part Name
1	95845T	REGULATOR, Voltage
2	10-92799	SCREW, (#10-16 x 1.12)
3	10-32,11-45076	NUT, Brass, VOLTAGE REGULATOR TERMINAL
4	84-74725A2	HARNESS ASSEMBLY Comment: VOLTAGE REGULATOR (BLACK/RED)
5	71663	PLUG, HARNESS
6	84-65017A2	HARNESS ASSEMBLY, LIGHTING (EXTERNAL)
7	86704A10	STATOR ASSEMBLY
8	10-4000123	SCREW, (M5 x 30), STATOR ATTACHING
9	86-638131	TERMINAL BLOCK
10	10-48409	SCREW, (#10-16 x .625) Stainless Steel, TERMINAL BLOCK

▶FUEL FILTER ASSEMBLY (16 parts)

Ref	OEM Part #	Part Name
-	27-41499A88	GASKET SET
1	35-889527A07	FILTER ASSEMBLY, Fuel
2	35-87946Q04	FILTER ASSEMBLY
3	25-897536	SEAL, FUEL FILTER
4	858731	BALL
5	32-8M0108355	LINE, (57.00 Inches Bulk), FILTER TO CARBURETOR (7-1/2")
6	32-8M0108355	LINE, (57.00 Inches Bulk), FILTER TO ADAPTOR (5-1/4)
7	54-68424	CLAMP, FUEL LINE
8	22-98750	FITTING, FUEL LINE
9	30188	WASHER, ADAPTOR
10	24-23067T	SPRING, ADAPTOR STEM
11	25-16524	O-RING, ADAPTOR STEM
12	23069	STEM, ADAPTOR
13	22833	ADAPTOR, CHECK UNIT
14	10-4000332	SCREW, (M6 x 35), ADAPTOR TO BOTTOM COWL
15	11-401386	NUT, (M6), ADAPTOR SCREW

▶GEAR HOUSING(DRIVESHAFT) (39 parts)

Ref	OEM Part #	Part Name
-	27-41499A88	GASKET SET
1	1665-8669A22	GEAR HOUSING ASSEMBLY, Mariner, BASIC
2	35-41133	SCREEN, Water Inlet Port, WATER INLET Comment: (PORT)
3	10-40031112	SCREW, (M5 x 40), SCREEN TO GEAR HOUSING
4	11-400263	NUT, (M5), SCREEEN SCREW
5	31-41326	BEARING, Roller, UPPER
6	26-99325	SEAL, GEAR HOUSING
7	17-8M0084726	PIN, Dowel (.187 x .530), GEAR HOUSING
8	31-98294A1	BEARING ASSEMBLY, Roller
9	43-98302	GEAR, Pinion
10	10-49908	SCREW, (.250-28 x .750), PINION GEAR
11	45-99198	DRIVESHAFT Comment: (LONG SHAFT)
13	22-8M0058389	SCREW, Magnetic, DRAIN
14	10-79953Q04	SCREW, (.375-16 x .250), GREASE FILLER
15	12-191833	WASHER, DRAIN AND FILLER SCREW
16	85562A1	CAM ASSEMBLY, SHIFT
17	17-85096	PIN, Drive, SHIFT CAM
18	17-85593	PIN, (.078 x .437), SHIFT SHAFT
19	12-8M0204649	WASHER, (.281 x .500 x .060) Stainless Steel, SHIFT SHAFT
20	24-93007	SPRING, SHIFT SHAFT
21	12-85091	WASHER, SHIFT SHAFT
22	25-85594	O-RING, (.239 x .174), SHIRT SHAFT
23	25-35276	O-RING, (.734 x .139), SHIFT SHAFT RETAINER
24	93878	RETAINER, SHIFT SHAFT
25	85552001	BOOT, SHIFT SHAFT
26	86293	SHIFT SHAFT Comment: (LONG SHAFT)
27	27-993261	GASKET, WATER PUMP
28	85083	FACE PLATE
29	12-8M0204722	WASHER, IMPELLER
30	28-8M0214993	KEY, IMPELLER DRIVE
31	47-8M0204712	IMPELLER (COLD WATER)
32	25-69202	O-RING, WATER PUMP
33	46-99157A02	PUMP ASSEMBLY, Water
34	10-400035	SCREW, (M5 x 16), WATER PUMP TO GEAR HOUSING
35	12-89302	WASHER, (.203 x .406 x .040), WATER PUMP SCEW
36	23-8M0214959	BUSHING, WATER PUMP SCREW
37	26-85090001	SEAL, WATER TUBE
38	25-86203	O-RING, DRIVESHAFT - RUBBER
38A	25-99691	O-RING

▶GEAR HOUSING(PROPELLER SHAFT) (28 parts)

Ref	OEM Part #	Part Name
-	27-41499A88	GASKET SET
1	1665-8669A22	GEAR HOUSING ASSEMBLY, Mariner, BASIC
39	97-98432Q6	TRIM TAB
40	10-4000355	SCREW, (M8 x 35), TRIM TAB
41	12-8M0042642	WASHER, (.323 x .563 x .063) Stainless Steel, TRIM TAB SCREW
42	31-8M0103470	BEARING ASSEMBLY, Roller, TAPERED
43	43-44213T1	GEAR ASSEMBLY, Forward
44	23-85557	BUSHING, FORWARD GEAR
45	85094	FOLLOWER, Cam
46	24-38114	SPRING, RETAINING - CROSS PIN
47	52-41040T	CLUTCH, SLIDING
48	17-8M0020999	PIN, CLUTCH TO PROPELLER SHAFT
49	24-88680	SPRING, COMPRESSION - PROPELLER SHAFT
50	44-8166231	PROPELLER SHAFT
51	43-99542T	GEAR, Reverse
52	99906T1	CARRIER ASSEMBLY, Bearing
53	31-21739	BEARING, Roller
54	26-41132	SEAL, Oil, BEARING CARRIER (INNER)
55	26-41131	SEAL, Oil, BEARING CARRIER (OUTER)
56	25-85549	O-RING, BEARING CARRIER
57	87293	PLATE, GEAR HOUSING
58	10-90883	SCREW, COVER TO GEAR HOUSING (16MM)
59	858498	THRUST HUB ASSEMBLY, PROPELLER
60	48-19640A40	PROPELLER ASSEMBLY
61	11-88228	PROP NUT
62	10-87810178	SCREW, GEAR HOUSING (25MM)
63	12-43328	WASHER, GEAR HOUSING SCREW
64	23-41589	SPACER, GEAR HOUSING SCREW

▶HARNESS AND START COMPONENTS (17 parts)

Ref	OEM Part #	Part Name
1	95815	COVER, START SWITCH (TOP)
2	95828	COVER, START SWITCH (BOTTOM)
3	87-95810A1	SWITCH ASSEMBLY, Start
4	11099A1	BOOT ASSEMBLY, START SWITCH
5	87-93479A4	SWITCH ASSEMBLY Comment: (MARINER SHIFT SIDE)
6	84-95084A2	CABLE ASSEMBLY, FUSE - EARLY MODELS
7	84-95084A3	CABLE ASSEMBLY, FUSE - EARLY MODELS
8	88-8M0207796	FUSE, 20 Ampere, EARLY MODELS
9	54-8M0024808	J CLIP, WIRE ASSEMBLY - EARLY MODELS
10	95814	STRAP, CLAMP
11	95813	FASTENER, CLAMP STRAP
12	10-40019108	SCREW, (M5 x 20)
13	10-4005727	SCREW
14	12-45771	WASHER
15	10-62568	SCREW, (#10-16 x .375), SWITCH WIRE
16	10-69570	SCREW, (#10-16 x .750), COVER
17	84-79139A20	CABLE ASSEMBLY (RED) - LATER MODELS

▶IGNITION COMPONENTS (24 parts)

Ref	OEM Part #	Part Name
1	84-88891A1	HARNESS ASSEMBLY, PRIMARY Comment: (W/NUT CONNECTIONS)
2	86617A20	STATOR ASSEMBLY
3	10-400015	SCREW, (M5 x 10), STATOR ATTACHING Comment: MANUAL
6	98450A10	TRIGGER ASSEMBLY
7	54-24836	CLIP, TRIGGER LEADS
8	10-77137	SCREW, (.190-16 x .620)
9	8M0084613	C WASHER, CLIP SCREW
10	339-832757A4	COIL ASSEMBLY, Ignition
11	997621	COVER, IGNITION COIL
12	10-40007115	SCREW, (M5 x 55), IGNITION COIL COVER
13	10-32,11-45076	NUT, Brass, COIL TERMINAL
14	84-813715A1	LEAD ASSEMBLY, HIGH TENSION
15	85-63709A1	BOOT/TERMINAL KIT, SPARK PLUG
16	33-14103Q	SPARK PLUG (CANADA AND BELGUIM)
17	339-7452A3	SWITCHBOX ASSEMBLY (WITH NUT CONNECTIONS)
18	339-7452A19	SWITCHBOX ASSEMBLY (WITH BULLET CONNECTIONS)
19	10-40019108	SCREW, (M5 x 20), SWITCH BOX TO CYLINDER BLOCK
20	10-32,11-45076	NUT, Brass, SWITCH BOX TERMINALS
21	84-88807A10	CABLE ASSEMBLY, GROUND
22	10-43394	SCREW, (#10-24 x .500), GROUND WIRE
23	86704A10	STATOR ASSEMBLY, AUXILIARY Comment: (MARINER)
24	10-4000123	SCREW, (M5 x 30), STATOR ATTACHING Comment: (MARINER)
25	86-638131	TERMINAL BLOCK Comment: (MARINER)
26	10-48409	SCREW, (#10-16 x .625) Stainless Steel, TERMINAL BLOCK Comment: (MARINER)

▶SERVICE/SUPPORT MATERIAL (1 parts)

Ref	OEM Part #	Part Name
-	90-11046871	OWNERS GUIDE Comment: (MARINER)

▶STARTER ASSEMBLY, MANUAL (24 parts)

Ref	OEM Part #	Part Name
1	86689A5	HOUSING ASSEMBLY, Starter
2	86971	COVER, STARTER HOUSING
3	858925	LEVER, LOCK (UPPER)
4	24-12734	SPRING, UPPER LOCK LEVER
5	93876T02	LEVER, LOCK (LOWER)
6	10-92799	SCREW, (#10-16 x 1.12), LOWER LOCK LEVER
7	17-38489	PIN, Roll, LOCK LEVER
8	10-4000183	SCREW, (M6 x 35), STARTER HOUSING
9	833161T	PAD, FELT
10	24-86857T01	SPRING, STARTER
11	50-825269T01	SHEAVE, STARTER
12	24-86851T02	SPRING, CAM
13	868501	CAM
14	53-86849T01	RING, Retaining, CAM
15	50-12066Q10	ROPE, STARTER
16	85174A1	HANDLE ASSEMBLY, STARTER ROPE
17	24-868523	SPRING, CAM
18	86853T01	CAM
19	10-826253	SCREW, CAM TO STARTER SHEAVE
20	426264	SUPPORT, STARTER HANDLE
21	10-40019111	SCREW, SUPPORT TO STARTER HOUSING (35MM)
22	12-4002313	WASHER, SUPPORT SCREW
23	23-309772	SPACER, SUPPORT SCREW
24	11-401385	NUT, (M5), SUPPORT SCREW

▶STEERING HANDLE ASSEMBLY(MARINER)(MANUAL) (17 parts)

Ref	OEM Part #	Part Name
1	8M0221732	GRIP, RUBBER
2	84-89591A5	HARNESS ASSEMBLY, STOP SWITCH
3	11099A1	BOOT ASSEMBLY, STOP SWITCH
4	87-823609A10	HANDLE ASSEMBLY, THROTTLE
5	23-11193	RING, STEERING HANDLE
6	10-62568	SCREW, (#10-16 x .375), THROTTLE HANDLE
7	99333A2	TUBE ASSEMBLY, STEERING
8	975501	TUBE ASSEMBLY
9	44397A7	BRACKET ASSEMBLY
10	10-4005688	SCREW, (M4 x 20), BRACKET CLAMPING
11	12-57860	WASHER, NYLON - BRACKET
12	11-859133	NUT, (1.00-14), BRACKET
13	23-85973	BUSHING, BRACKET
14	43242	CABLE ASSEMBLY, THROTTLE
15	11-400212	NUT, (M6) Stainless Steel, THROTTLE CABLE
16	43447A4	BRACKET ASSEMBLY, STEERING
17	10-4000384	SCREW, (M10 x 80), BRACKET TO SWIVEL TUBE

▶STEERING HANDLE ASSEMBLY(MERCURY) (MANUAL) (18 parts)

Ref	OEM Part #	Part Name
-	94185A16	HANDLE ASSEMBLY, Steering
1	8M0221732	GRIP, RUBBER
2	84-89591A5	HARNESS ASSEMBLY, STOP SWITCH
3	11099A1	BOOT ASSEMBLY, STOP SWITCH
4	87-823609A10	HANDLE ASSEMBLY, THROTTLE
5	37-140121	DECAL, THROTTLE Comment: (APPLY ON TUBE)
6	10-62568	SCREW, (#10-16 x .375), THROTTLE HANDLE
7	99333A2	TUBE ASSEMBLY, STEERING
8	975501	TUBE ASSEMBLY
9	44397A6	BRACKEY ASSEMBLY
10	10-4005688	SCREW, (M4 x 20), BRACKET CLAMPING
11	12-57860	WASHER, NYLON - BRACKET
12	11-859133	NUT, (1.00-14), BRACKET
13	23-85973	BUSHING, BRACKET
14	43242	CABLE ASSEMBLY, THROTTLE
15	11-400212	NUT, (M6) Stainless Steel, THROTTLE CABLE
16	43447A3	BRACKET ASSEMBLY, STEERING
17	10-4000384	SCREW, (M10 x 80), BRACKET TOSWIVEL TUBE

▶SWIVEL BRACKET ASSEMBLY (36 parts)

Ref	OEM Part #	Part Name
-	27-41499A88	GASKET SET
1	97544A2	SWIVEL TUBE ASSEMBLY, Mariner
2	10-125161	SCREW, (M8 x 133.35), UPPER MOUNT
3	14894	MOUNT, UPPER
4	12-85172	WASHER, RUBBER - UPPER MOUNT SCREW
5	12-43430	WASHER, UPPER MOUNT SCREW
6	11-400213	NUT, UPPER MOUNT SCREW
7	85157	ROD, REVERSE HOOK
8	85173	PLATE, PILOT CONTROL Comment: (DESIGN I)
9	12-85104	WASHER Comment: (DESIGN I)
10	3415-822237A2	SWIVEL BRACKET Comment: (MARINER)(DESIGN I)
11	22-8M0169589	FITTING, Grease Comment: (DESIGN I)
12	23-95949	BUSHING, SWIVEL BRACKET Comment: (DESIGN I)
13	10-91807	SCREW, PILOR CONTROL Comment: (DESIGN I)
14	24-96203	SPRING, PILOT CONTROL SCREW Comment: (DESIGN I)
15	25-86993	O-RING, SWIVEL TUBE Comment: (DESIGN I)
16	23-85154	BUSHING, SWIVEL TUBE (LOWER) Comment: (DESIGN I)
17	3415-822237A2	SWIVEL BRACKET Comment: (MARINER)(DESIGN II)
18	22-8M0169589	FITTING, Grease Comment: (DESIGN II)
19	54-11139A2	CLAMP ASSEMBLY, CO-PILOT Comment: (DESIGN II)
20	25-86993	O-RING, SWIVEL TUBE Comment: (DESIGN II)
21	98830A2	HOOK ASSEMBLY, REVERSE LOCK
22	24-96018	SPRING, REVERSE HOOK - PORT
23	24-879894	SPRING, REVERSE HOOK -STARBOARD
24	85122001	MOUNT, LOWER
25	85123001	BUMPER, Front
26	95068A2	COVER, LOWER MOUNT Comment: MARINER
27	10-1994360	SCREW, LOWER MOUNT COVER (60MM)
28	10-19943100	SCREW, LOWER MOUNT COVER (100MM)
29	11-400213	NUT, (M8) Stainless Steel, LOWER MOUNT COVER SCREW
30	12-36001	WASHER, LOWER MOUNT COVER SCREW
31	12756	BRACKET, TROLL
32	12758	LEVER, CONTROL
33	24-12754	SPRING
34	17-13195	PIN, TROLL BRACKET
35	53-13194	RING, Retaining

▶THROTTLE AND SHIFT LINKAGE(ELECTRIC) (46 parts)

Ref	OEM Part #	Part Name
1	17764A2	CAM, Throttle Comment: SN# US-0B114231/Aus-9467988/Can-0A719661 & Up
2	10-4000117	SCREW, (M5 x 20) Comment: SN# US-0B114231/Aus-9467988/Can-0A719661 & Up
3	12-87791	WASHER, THROTTLE CAM SCREW
4	13-69150	WAVE WASHER, THROTTLE CAM SCREW
5	17764A2	BUSHING, THROTTLE CAM SCREW
6	92425	DASHPOT
7	93001	BRACKET, DASHPOT
8	11-22053	NUT, (.312-24), DASHPOT TERMINAL
9	98463A2	ROD ASSEMBLY, Throttle
10	10-32,11-68219	NUT, Stainless Steel, LOCK-THROTTLE ROD
11	8M0084742	SOCKET, THROTTLE ROD
12	433601	LEVER, CONTROL
13	817429	TIMING ROD
15	8M0084742	SOCKET, TIMING ROD
16	42026A2	PLATFORM, CONTROL
17	24-89540	SPRING, SPARK ADVANCE
18	42343	LEVER, ACTUATING
19	53-46250	RING, Retaining, ACTUATING AND CONTROL LEVER
20	56-8M0206596	SCREW, (M6 x 20), CONTROL PLATFORM
21	10-40007127	SCREW, SHIFT LEVER TO PLATFORM (16MM)
22	12-95093	WASHER, SHIFT LEVER TO PLATFORM
23	43424	LEVER, SHIFT
24	23-95091	SLEEVE, SHIFT LEVER TO PLATFORM
25	12-35280	WASHER, (.255 x .620 x .030) Stainless Steel, SHIFT LEVER TO SCREW
26	11-401386	NUT, (M6), SHIFT LEVER SCREW
27	42846A2	COVER ASSEMBLY
28	39519	CUP, RETAINER
29	10-118591	SCREW, (.190-32 x 1.75), IDLE STOP - CONTROL LEVER
30	17724A1	SHIFT LINK
31	23-96202	BUSHING, NYLON - SHIFT LINK
32	12-89302	WASHER, (.203 x .406 x .040), SHIFT LINK
33	18-210711	COTTER PIN, SHIFT LINK
34	95027A6	SHIFT SHAFT ASSEMBLY, HORIZONTAL
35	95023	LEVER, SHIFT SHAFT
36	53-95019	RING, Retaining, LEVER TO SHIFT SHAFT
37	23-60762	BUSHING, SHIFT SHAFT
38	17724A1	LEVER, SHIFT SHAFT
39	11-401385	NUT, (M5), SHIFT SHAFT
40	424291	RETAINER, CABLE
41	96186A2	BRACKET ASSEMBLY, ATTACHING
42	96201	STRAP, Key
43	10-1993325	SCREW, (M10 x 25), BRACKET
44	41323A03	LINK ROD ASSEMBLY, STEERING
45	10-849838	SCREW, (.375-24 x 1.25), LINK ROD
46	12-34931	WASHER, (.406 x .734 x .063) Stainless Steel, SCREW AND LINK ROD
47	11-8M0204726	NUT, (.375-24), SCREW AND LINK ROD

▶THROTTLE AND SHIFT LINKAGE(MARINER)(MANUAL) (40 parts)

Ref	OEM Part #	Part Name
1	17764A2	CAM, Throttle Comment: SN# US-0B114231/Aus-9467988/Can-0A719661 & Up
2	10-4000117	SCREW, (M5 x 20) Comment: SN# US-0B114231/Aus-9467988/Can-0A719661 & Up
3	12-87791	WASHER, THROTTLE CAM SCREW
4	13-69150	WAVE WASHER, THROTTLE CAM SCREW
5	17764A2	BUSHING, THROTTLE CAM SCREW
6	92425	DASHPOT
7	93001	BRACKET, DASHPOT
8	11-22053	NUT, (.312-24), DASHPOT TERMINAL
9	98463A2	ROD ASSEMBLY, Throttle
10	10-32,11-68219	NUT, Stainless Steel, LOCK - THROTTLE ROD
11	8M0084742	SOCKET, THROTTLE ROD
12	423301	HANDLE, SHIFT
13	23-60762	BUSHING, SHIFT HANDLE
14	423291	LEVER, SHIFT
15	42358	BACKPLATE, SHIFT LEVER
16	11-401385	NUT, (M5), SHIFT LEVER
17	24-39627	SPRING, DETENT
18	39601	PLATE, DETENT SPRING
19	10-400011	SCREW, (M5 x 8), DETENT SPRING AND PLATE
20	23-96202	BUSHING, SHIFT LINK
21	12-89302	WASHER, (.203 x .406 x .040), SHIFT LINK
22	18-210711	COTTER PIN, SHIFT LINK
23	11042	LINK, SHIFT
24	110501	LEVER, THROTTLE LIMIT
25	10-4000117	SCREW, (M5 x 20), THROTTLE LIMIT LEVER
26	23-8M0214959	BUSHING, THROTTLE LIMIT LEVER
27	12-89302	WASHER, (.203 x .406 x .040), THROTTLE LIMIT SCREW
28	11-401385	NUT, (M5)
29	11039	BRACKET, CABLE
30	10-4000177	SCREW, (M6 x 25), CABLE BRACKET
31	42026A2	PLATFORM, CONTROL
32	10-4000171	SCREW, (M6 x 16), PLATFORM TO BLOCK
33	110383	LEVER, CONTROL
34	10-118591	SCREW, (.190-32 x 1.75), CONTROL LEVER
35	48039	CAP, CONTROL LEVER SCREW
36	24-89540	SPRING, SPARK ADVANCE
37	42343	LEVER, ACTUATING
38	53-46250	RING, Retaining, ACTUATING LEVER
39	817429	TIMING ROD
40	8M0084742	SOCKET, TIMING LINK

▶THROTTLE AND SHIFT LINKAGE(MERCURY)(MANUAL) (39 parts)

Ref	OEM Part #	Part Name
1	17764A2	CAM, Throttle Comment: SN# US-0B114231/Aus-9467988/Can-0A719661 & Up
2	10-4000117	SCREW, (M5 x 20) Comment: SN# US-0B114231/Aus-9467988/Can-0A719661 & Up
3	12-87791	WASHER, THROTTLE CAM SCREW
4	13-69150	WAVE WASHER, THROTTLE CAM SCREW
5	17764A2	BUSHING, THROTTLE CAM SCREW
6	92425	DASHPOT
7	93001	BRACKET, DASHPOT
8	11-22053	NUT, (.312-24), SADHPOT TERMINAL
9	98463A2	ROD ASSEMBLY, Throttle
10	10-32,11-68219	NUT, Stainless Steel, LOCK-THROTTLE ROD
11	8M0084742	SOCKET, THROTTLE ROD
12	433601	LEVER, CONTROL
13	817429	TIMING ROD
15	8M0084742	SOCKET, TIMING ROD
16	12863A1	PLATFORM, CONTROL
17	24-89540	SPRING, SPARK ADVANCE
18	92362A1	LEVER, ACTUATIN
19	53-46250	RING, Retaining, ACTUATING AND CONTROL LEVER
20	92362A1	LINK, THROTTLE/ADVANCE
21	53-86731	RETANINING RING, THROTTLE/ADVANCE LINK
22	94152	GEAR
23	92362A1	LEVER, PRIMARY
24	24-8M0215005	SPRING, DETENT BALL
26	30-93008	BALL, DETENT
27	94085A1	GEAR, SHIRT
28	12-49339	WASHER, (.8125), SHIFT GEAR
29	53-46250	RING, Retaining, SHIFT GEAR
30	193852	SHIFT ROD
31	94084	LEVER, SHIFT ROD
32	10-4001589	LEVER, Shift Rod
33	23-60762	BUSHING, SHIFT SHAFT
34	87794	SHIFT SHAFT, HORIZONITAL
35	93744	LEVER, SHIFT SHAFT
36	93928	LEVER, ROD END
37	10-4001588	SCREW, (M4 x 20), ROD END LEVER
38	94186	BRACKET, THROTTLE CABLE (EARLY MODELS)
39	10-4000171	SCREW, (M6 x 16), BRACKET TO CYLINDER BLOCK
40	10-118591	SCREW, (.190-32 x 1.75), IDLE STOP - CONTROL LEVER
41	48039	CAP, CONTROL LEVER SCREW

100-Hour / Annual Service Checklist

Regular maintenance keeps your Mercury 18XD 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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