Mercury 150 (4-Stroke) (1B905505 & Up) Parts & Diagrams

🔎 Mercury 150 (4-Stroke) Reference Library — Exploded parts diagrams (37 diagrams), specifications, common issues, and maintenance checklist.

The Mercury 150 (4-Stroke) is a 4-Stroke, Inline 4-Cylinder, SOHC, 8-valve outboard motor. Powers center-console boats, larger pontoons, and offshore-capable fishing craft.

Quick Reference Specifications

Specification	Value
Engine Type	4-Stroke, Inline 4-Cylinder, SOHC, 8-valve
Horsepower	150 HP
Displacement	3000 cc (3.0L / 183 CID)
Bore x Stroke	96 mm x 103 mm (3.78 in. x 4.06 in.)
Spark Plug (Type & Gap)	NGK ZFR5F
Engine Oil Capacity	5.5 L (5.8 qt)
Recommended Engine Oil	Mercury FourStroke Oil 10W-30
Gear Case Oil Capacity	980 mL (33.1 oz)
Idle Speed (in gear)	650 ± 50 RPM (in gear)
Full Throttle RPM Range	5000-6000
Fuel	Unleaded Gasoline, 87 Octane min. (90 RON, 10% Ethanol max)

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 150 (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 150 (4-Stroke).

▶Accessories (1 parts)

Ref	OEM Part #	Part Name
-	898289T19	SIGNAL MODULE, Power Steering

▶Adaptor Plate (9 parts)

Ref	OEM Part #	Part Name
1	27-8M0057703	GASKET, Adapter Plate/Block
2	25-8M0065017	O-RING, (M10.85 X 58.9)
3	8M0142710	DRAIN, Cowl
4	25-8M0058484	GROMMET
5	8M0188434	ADAPTER PLATE
6	10-8M0069690	SCREW, (M10 X 1.5 X 60)
7	10-8M0103815	SCREW, (M8 x 40)
8	17-821327	PIN, Dowel
9	8M0044025	SEAL, Adapter Plate

▶Cooling (31 parts)

Ref	OEM Part #	Part Name
1	22-8M0058214	FITTING, Water Strainer
2	54-8M0204719	CLAMP, (36.1 mm)
3	32-8M0028132	HOSE, Thermostat
4	32-8M0028275	HOSE, Tell Tale
5	54-892833	CLIP
6	10-8M0037204	SCREW, Nylon, push in
7	54-8M0035891	CLIP, Hose
8	54-8M0224396	CLIP, Hose
9	8M0057702	TELLTALE
10	25-38101	O-RING, (.674 x .103)
11	10-8M0103805	SCREW, (M6 x 16 MM) Stainless Steel
12	54-888988011	CLAMP, (38.1 mm)
13	10-8M0103807	SCREW, (M6 x 25 MM) Stainless Steel
14	22-885518A02	FITTING ASSEMBLY
15	25-62701	O-RING
16	22-8M0038205	FITTING, Straight
17	32-8M0028130	HOSE, FSM, Water Inlet
18	54-816311T	TIE STRAP, (8.00 Inches)
19	32-8M0035248	HOSE, Drain
20	32-8M0045298	HOSE, Sprayer
21	22-8M0050013	FITTING, Exhaust Cooling
22	22-8M0035658	FITTING, 90Â° with sealant
23	54-888988022	CLAMP
24	32-8M0057620	HOSE, Flush
25	32-8M0102826	HOSE ASSEMBLY, Flushing
26	54-8M0204696	CLAMP, (16.2 mm)
27	32-8M0057599	TUBING, (8 ID X 14 OD X 840 MM)
28	8M0048537	BRACKET, Hose Clip
29	10-8M0103807	SCREW, (M6 x 25 MM) Stainless Steel
30	8M0090819	HOUSING ASSEMBLY, Thermostat
31	25-8M0005958	O-RING

▶Crankshaft, Pistons and Connecting Rods (24 parts)

Ref	OEM Part #	Part Name
1	700-8M0098836	PISTON ASSEMBLY Comment: SN# 0B038439 & Up
2	39-8M0098837	PISTON RING SET Comment: SN# 0B038439 & Up
3	NSS	NOT SOLD SEPARATE, OIL RING ASSEMBLY
4	40-881184	CIRCLIP Comment: SN# 0B038439 & Up
5	NSS	NOT SOLD SEPARATE, Wrist pin
6	600-8M0168895	CONNECTING ROD ASSEMBLY
7	10-8M0064457	BOLT, Rod
8	23-8M0057692	BEARING, Connecting Rod,Navy Blue
9	53-8M0071542	RETAINING RING
10	26-8M0035127	SEAL, Top main brg flywheel end
11	23-8M0036025	SPACER
12	400-8M0057666	CRANKSHAFT ASSY
13	25-8M0034912	O-RING, 3.78 X 21.32
14	23-8M0057689	BEARING SET, Main, Green
15	8M0057669	CHAIN, Balance Shaft
16	10-8M0103806	SCREW, (M6 x 20 MM) Stainless Steel
17	12-8M0214930	WASHER
18	8M0051757	BALANCE SHAFT, Vespel
19	10-8M0103808	SCREW, (M6 x 30 MM) Stainless Steel
20	8M0086230	HYDRAULIC TENSIONER ASSY, Vespel
21	10-8M0058350	SCREW, M6X1X25
22	8M0082257	TENSIONER BRACKET, Hydraulic
23	19-8M0087446	PLUG, (10 MM)
24	NSS	NOT SOLD SEPARATE, O-ring, M1.5 X 7

▶Cylinder Block (25 parts)

Ref	OEM Part #	Part Name
-	61-8M0122812	SHORT BLOCK ASSEMBLY
1	800-8M0122813	CYLINDER BLOCK ASSY
2	NSS	NOT SOLD SEPARATE, Bedplate
3	17-893540	PIN, Dowel, 8x12 long
4	10-8M0145444	SCREW, M10X1.50X95 HX FLG HD
5	8M0057644	DIPSTICK ASSEMBLY
6	25-8M0048519	O-RING, 012, Viton
7	19-8M0087451	PLUG, (18 MM)
8	NSS	NOT SOLD SEPARATE, O-ring, M2 X 15
9	19-8M0087454	PLUG, (30 MM)
10	NSS	NOT SOLD SEPARATE, O-ring, M2.5 X 27
11	19-8M0087453	PLUG, (24 MM)
12	NSS	NOT SOLD SEPARATE, O-ring, M2 X 21
13	10-8M0103807	SCREW, (M6 x 25 MM) Stainless Steel
14	8M0057645	CRANKCASE COVER
15	8M0069596	SEAL, Crankcase Cover
16	8M0065093	CAP
17	10-8M0146359	SCREW, (M8 X 1.25 X 95)
18	8M0057670	BALANCE SHAFT ASSEMBLY
19	8M0057658	OIL PUMP ASSEMBLY
20	10-8M0103810	SCREW, (M6 x 45 MM) Stainless Steel
21	8M0048484	OIL PICKUP TUBE ASSEMBLY
22	54-8M0187146	CLAMP, (39.6 MM)
23	32-8M0055656	HOSE, Oil Pickup
24	12-8M0043913	THRUST WASHER

▶Cylinder Head and Camshaft (35 parts)

Ref	OEM Part #	Part Name
-	900-8M0169879	CYLINDER HEAD ASSEMBLY Comment: SeaPro
1	8M0057648	CYLINDER HEAD, Bare
2	8M0029981	VALVE SEAT, Exhaust
3	8M0029982	VALVE SEAT, Intake
4	8M0029980	VALVE GUIDE
5	19-8M0087454	PLUG, (30 MM)
6	NSS	NOT SOLD SEPARATE, O-ring, M2.5 X 7
7	19-8M0087453	PLUG, (24 MM)
8	NSS	NOT SOLD SEPARATE, O-ring, M2 X 21
9	19-8M0087446	PLUG, (10 MM)
10	NSS	NOT SOLD SEPARATE, O-ring, M1.5 X 7
11	NSS	NOT SOLD SEPARATE
12	10-8M0163131	BOLT, (M6 x 36)
13	8M0032524	ROLLER FINGER FOLLOWER ASSY
14	22-8M0058214	FITTING, Water Strainer
15	8M0098635	VALVE, Exhaust Comment: SeaPro
16	8M0098634	VALVE, Intake Comment: SeaPro
17	16-8M0047625	STUD, Ball End M10 X 1
18	8M0037758	RETAINER, Valve
19	28-8M0035317	KEY, Valve Retainer Comment: 2 per valve
20	8M0057651	VALVE SEAL KIT
21	24-8M6001704	SPRING, Valve
22	400-8M0183245	CAMSHAFT ASSEMBLY
23	17-8M0084726	PIN, Dowel (.187 x .530)
24	8M0035600	BLADE, Timing Chain
25	8M0035484	GUIDE, Fixed, Timing Chain
26	43-880550	SPROCKET
27	10-8M0086569	SCREW, Shoulder, M8 X 1.25 MM
28	8M0126057	CHAIN, Cam
29	10-8M0021532	SCREW, (M12 x 40 MM), Left Hand Thread
30	8M0057657	TENSIONER ASSY, Timing Chain
31	25-898836	O-RING, Brown
32	1100-8M0064752	END CAP, Cam Tensioner
33	10-8M0103807	SCREW, (M6 x 25 MM) Stainless Steel
34	11-8M0047686	NUT, M10 X 1

▶Cylinder Head and Camshaft Cover (6 parts)

Ref	OEM Part #	Part Name
1	10-8M0103807	SCREW, (M6 x 25 MM) Stainless Steel
2	8M0057659	CAMSHAFT COVER ASSY
3	8M0069588	SEAL, Camshaft Cover
4	10-8M0145444	SCREW, M10X1.50X95 HX FLG HD
5	10-8M0103809	SCREW, (M6 x 40 MM) Stainless Steel
6	27-8M6000366	HEAD GASKET

▶DriveShaft Housing Extension Kit (20 parts)

Ref	OEM Part #	Part Name
-	8M0105087	EXTENSION KIT, Driveshaft Housing, Convert L to XL
1	8M0105088	SPACER, Driveshaft Housing X-Long
2	45-8M0063505	DRIVESHAFT, X-Long
3	31-33138A1	BEARING ASSEMBLY, Tapered Roller
4	31-8M0166756	BEARING ASSEMBLY, Roller
5	15-8M0053110	SHIM SET
6	15-8M0063268	SHIM SET
7	8M0214995	COUPLING, Water Pump
8	8M0050570	TUBE, Water Spacer, X-long
9	23-8M0061394	BUSHING
10	27-8172771	GASKET
11	8M0140439	SHIFT SHAFT, X-Long
12	8M0030784	WASHER, Keyed
13	17-43044	PIN, Dowel - Without Hole (.375 x .625)
14	17-8M0084244	PIN, Dowel - With Hole (.375 x .625)
15	11-896895	NUT, (M12)
16	12-856982	WASHER, (.500 x .810 x .090) Stainless Steel
17	10-857137	SCREW, (M12 x 160)
18	16-8M0008047	STUD, (M12 x 179)
19	11-35921	NUT, (.625-18)

▶Driveshaft Housing (24 parts)

Ref	OEM Part #	Part Name
1	1500-8M0219176	DRIVESHAFT HOUSING, Long
2	16-8M0008031	STUD, (M12 x 1.75 x 52)
3	10-8M0102995	SCREW, (M12 x 35 MM)
4	12-856982	WASHER, (.500 x .810 x .090) Stainless Steel
5	11-896895	NUT, (M12)
6	54-8M0051768	CLAMP, Cable .375
7	54-24836	CLIP
8	22-8M0062365	FITTING, Straight
9	10-8M0037204	SCREW, Nylon, push in
10	25-892446	O-RING, (14 X 1.78 MM)
11	22-8M0050013	FITTING, Exhaust Cooling
12	12-8M0214930	WASHER
13	10-8M0103804	SCREW, (M6 x 12 MM) Stainless Steel
14	23-8M0143836	BUSHING, Shift Shaft
15	10-8M0069690	SCREW, (M10 X 1.5 X 60)
16	8M0050571	TUBE, Water, Long
17	8M0050570	TUBE, Water Spacer, X-long
18	25-8M0035476	GROMMMET, Water Tube
19	8M0042271	GUIDE, Water Tube
20	25-8M0033182	SEAL, Exhaust Pipe
21	19-8M0053658	PLUG, Long, Rear Driveshaft Housing
22	22-8M0057706	SPEEDOMETER HOSE ASSY
23	8M0057725	LOWER MOUNT ASSEMBLY
24	10-8M0069689	SCREW, (M10X1.5X40) Hex Flange

▶Dual Cable Attaching Kit (12 parts)

Ref	OEM Part #	Part Name
-	92876A8	ATTACHING KIT, Steering
1	41055A1	BRACKET ASSEMBLY
2	715651	TUBE, Steering Cable
3	25-48462	O-RING, (.614 x .070)
4	13-821203	LOCKWASHER
5	11-8M0041651	NUT, (.875-14)
6	10-38601	SCREW, (.250-28 x 1.250)
7	13-78968	LOCKWASHER, Internal (.250)
8	850791T	COUPLER
9	10-73732	SCREW, (.375-24 x 1.120)
10	12-37828	WASHER, (.390 x .625 x .062) Stainless Steel
11	11-8M0204726	NUT, (.375-24) Brass

▶Electrical (24 parts)

Ref	OEM Part #	Part Name
-	88-878230	FUSE, 100 Ampere
1	10-8M0069690	SCREW, (M10 X 1.5 X 60)
2	8M0065239	ALTERNATOR
3	11-401386	NUT, (M6) Stainless Steel
4	57-8M0031641	BELT, Poly V, 4 Rib
5	10-8M0103807	SCREW, (M6 x 25 MM) Stainless Steel
6	12-65567	WASHER, (.265 x .750 x .048) Stainless Steel
7	25-8M0190980	GROMMET
8	23-856954	BUSHING
9	8M0099169	COVER, Power Center Comment: SeaPro
10	8M0219829	CUBE RELAY
11	88-8M0207797	FUSE, Mini - Gray - 2 Ampere
12	8M0047885	FUSE COVER, With Spares
13	54-899145	CLIP, Tie Strap
14	54-859376	CLIP
15	77-8M0168124	ECM 150HP 4S, SeaPro
16	84-8M0057698	HARNESS ASSY, Fused
17	84-8M0033589	CABLE ASSY, Starter
18	84-88439A46	CABLE ASSEMBLY, Battery - Positive
19	84-88439A26	CABLE ASSEMBLY, Battery - Negative
20	84-8M0057696	HARNESS ASSEMBLY, Engine
21	54-816311T	TIE STRAP, (8.00 Inches)
22	37-8M0094687	Decal, Maintenance Schedule Comment: SeaPro
23	37-8M0098217	Decal, Maintenance Schedule Comment: Non SeaPro

▶Exhaust (21 parts)

Ref	OEM Part #	Part Name
-	8M0054073	IDLE RELIEF TUBE ASSEMBLY
1	42-8M0057720	MUFFLER, Idle Relief
2	8M0041811	ELBOW, Muffler, Idle Relief
3	54-8M0065660	CLAMP
4	10-8M0103804	SCREW, (M6 x 12 MM) Stainless Steel
5	8M0053504	TUBE- IDLE RELIEF, ADP Exit
6	25-8M0204673	O-RING, (.921 x .139)
7	25-8M0052942	GROMMET, Tailpipe
8	25-8M0033321	O-RING, (-228, D2.234 X D.139)
9	25-35029	O-RING, (78.97 X 3.53 MM)
10	8M0043453	SEAL, Flange Exhaust Pipe
11	8M0128074	EXHAUST PIPE ASSY
12	19-8M0087451	PLUG, (18 MM)
13	NSS	NOT SOLD SEPARATE, O-ring, M2 X 15
14	8M0036226	SEAL, Exhaust Pipe
15	8M0034043	GROMMET, Water Tube
16	10-8M0103807	SCREW, (M6 x 25 MM) Stainless Steel
17	8M0042150	STRAINER ASSEMBLY
18	26-8M0142720	SEAL, Strainer
19	10-8M0069690	SCREW, (M10 X 1.5 X 60)
20	10-8M0103805	SCREW, (M6 x 16 MM) Stainless Steel

▶Exhaust Manifold (8 parts)

Ref	OEM Part #	Part Name
1	27-8M6000365	GASKET, Exhaust Manifold
2	8M0064986	EXHAUST MANIFOLD ASSEMBLY
3	19-8M0087451	PLUG, (18 MM)
4	NSS	NOT SOLD SEPARATE, O-ring, M2 X 15
5	22-8M0035658	FITTING, 90Â° with sealant
6	10-8M0103817	SCREW, (M8 x 60)
7	8M0050772	COVER, High Tension Lead
8	10-8M0037204	SCREW, Nylon, push in

▶Flywheel and Cover (6 parts)

Ref	OEM Part #	Part Name
1	10-8M0012661	SCREW
2	8M0057690	COVER, Flywheel
3	10-8M0147042	BOLT, (M20 x 68)
4	12-8M0090010	WASHER, 66 X 21 X 6.35 MM
5	200-8M0057668	FLYWHEEL ASSEMBLY
6	28-91800	KEY, Woodruff

▶Fuel Supply Module (24 parts)

Ref	OEM Part #	Part Name
-	8M0057679	FSM SEAL KIT
1	10-8M0053756	SCREW, Plastite W/ HX WSR HD
2	8M0158344	FSM TOP HOUSING
3	NSS	NOT SOLD SEPARATE, O-ring
4	8M0053749	REGULATOR ASSEMBLY
5	NSS	NOT SOLD SEPARATE Comment: O-ring
6	NSS	NOT SOLD SEPARATE Comment: O-ring
7	NSS	NOT SOLD SEPARATE Comment: Seal
8	NSS	NOT SOLD SEPARATE Comment: O-ring
9	8M0053727	FSM CAP
10	NSS	NOT SOLD SEPARATE Comment: Seal
11	8M0062771	PUMP ASSY, Low Pressure
12	8M0062770	PUMP ASSY, High Pressure
13	NSS	NOT SOLD SEPARATE Comment: O-ring
14	32-8M0119250	TUBE Comment: Fuel
15	32-8M0053755	TUBE Comment: Suction
16	NSS	NOT SOLD SEPARATE Comment: O-ring
17	8M0120073	TUBE Comment: Water
18	NSS	NOT SOLD SEPARATE Comment: Seal
19	8M0053725	FSM BOTTOM HOUSING
20	84-8M6004776	ELECTRICAL HARNESS ASSEMBLY
21	NSS	NOT SOLD SEPARATE, O-ring
22	NSS	NOT SOLD SEPARATE, O-ring
23	NSS	NOT SOLD SEPARATE Comment: Spacer

▶Fuel Supply System, Hoses and module (19 parts)

Ref	OEM Part #	Part Name
1	32-8M0034897	HOSE, Manifold Ref
2	54-8M0204696	CLAMP, (16.2 mm)
3	8M0028121	HOSE, FSM to Rail
4	54-8M0204696	CLAMP, (16.2 mm)
5	35-8M0057677	FUEL FILTER, Inline
6	54-816311T	TIE STRAP, (8.00 Inches)
7	23-8M0059106	SLEEVE, Static, Dia 19.05
8	32-8M0203766	HOSE, Fuel- Inlet to Filter
9	8M0057680	RETAINER, Fuel Filter
10	25-8M0204673	O-RING, (.921 x .139)
11	8M0037209	GROMMET, FSM Retainer
12	23-856954	BUSHING
13	25-8M0190980	GROMMET
14	12-65567	WASHER, (.265 x .750 x .048) Stainless Steel
15	10-8M0103807	SCREW, (M6 x 25 MM) Stainless Steel
16	54-8M0224396	CLIP, Hose
17	10-8M0037204	SCREW, Nylon, push in
18	32-8M0203764	HOSE, Fuel- Filter to FSM
19	35-879885Q	FILTER, Fuel In-Line

▶Gear Housing, Driveshaft, Standard/Counter Rotation (46 parts)

Ref	OEM Part #	Part Name
-	8M0060147	SKEG
1	1600-8M0099907	GEARCASE HOUSING ASSY, Basic Comment: SeaPro
2	10-79953A04	PLUG ASSEMBLY, (.375-16 x .250)
3	26-8M0204693	SEAL
4	17-8M0084244	PIN, Dowel - With Hole (.375 x .625)
5	17-43044	PIN, Dowel - Without Hole (.375 x .625)
6	31-42647A1	BEARING ASSEMBLY, Roller
7	97-826134Q	ANODE
8	10-4000333	SCREW, (M6 x 40)
9	11-401386	NUT, (M6) Stainless Steel
10	8M0010459	FILLER BLOCK
11	8M0214995	COUPLING, Water Pump
12	10-8M0204706	SCREW, (M6 x 20)
13	817275A10	HOUSING KIT, Water Pump
14	26-8M0142851	SEAL, Face
15	28-8M0204723	KEY
16	47-43026T2	IMPELLER
17	27-8172771	GASKET
18	8M0204709	FACEPLATE
19	27-8M0142616	GASKET
20	53-880719	RING, Retaining
21	8M0057748	OIL SEAL CARRIER ASSY
22	26-89238	SEAL, Oil
23	25-8M0142854	O-RING, (2.175 x .103)
24	853651	RETAINER
25	31-33138A1	BEARING ASSEMBLY, Tapered Roller
26	NSS	NOT SOLD SEPARATE
27	15-8M0053110	SHIM SET
28	31-8M0166756	BEARING ASSEMBLY, Roller
29	NSS	NOT SOLD SEPARATE
30	15-8M0063268	SHIM ASSEMBLY Comment: Component of 8M0057741
31	45-8M0063503	DRIVESHAFT, Long
32	NSS	NOT SOLD SEPARATE, Pinion Comment: Component of 8M0057741
33	11-35921	NUT, (.625-18)
34	8M0031503	SHIFT SHAFT, Long
35	53-8M0029306	RING, Retaining
36	26-8M0204708	SEAL, Oil
37	12-77674	WASHER
38	23-813696A2	BUSHING ASSEMBLY
39	25-45258	O-RING, (.987 x .103)
40	53-29641	E RING
41	12-92721	WASHER
42	25-8M0204645	O-RING, (.796 x .139)
43	10-8M0204686	SCREW, (.437-14 x 1.750)
44	97-76214Q5	ANODE KIT
45	22-67892002	SCREW, Magnetic Comment: SeaPro

▶Gear Housing, Propeller Shaft, Counter (34 parts)

Ref	OEM Part #	Part Name
-	1600-8M0099914	GEARCASE HOUSING ASSY, Complete, CXL Comment: SeaPro
1	1600-8M0099907	GEARCASE HOUSING ASSY, Basic Comment: SeaPro
2	8M0031508	ADAPTER, Reverse Gear
3	31-814653T	BEARING ASSEMBLY, Needle Rollers
4	12-815481	THRUST WASHER
5	31-815480	BEARING, Thrust
6	53-8M0071554	RING, Retaining
7	31-8M0057742	BEARING, Needle
8	43-8M0065074	GEAR, Reverse, 25T, Left Hand
9	8M0031291	FOLLOWER, CAM
10	8M0077490	CAM, Shift Comment: SeaPro
11	8M0057749	ROD, Clutch Actuator
12	30-8M0054823	BALL BEARING, .2500 dia, NLA - No Longer Required
13	24-8M0058020	SPRING, Compression .305 OD, NLA - No Longer Required
14	30-8M0054824	BALL BEARING, .3125 dia, NLA - No Longer Required
15	24-8M0047945	SPRING, Retaining
16	52-8M0073249	CLUTCH, Sliding, 6 Jaw Comment: SeaPro
17	17-8M0045759	PIN, Cross
18	43-8M0065268	GEAR, Forward, 25T, Left Hand
19	8M0031509	BEARING ADAPTER, Forward Gear
20	23-8M0038356	SHIM, 5.816
21	25-8M0030845	O-RING, 3.975X.210
22	12-18448	THRUST WASHER
23	31-15842	BEARING, Thrust
24	44-8M0073789	PROPELLER SHAFT, Left Hand
25	8M0031510	BEARING CARRIER, Counter
26	10-8M0077071	SCREW/SEAL KIT, .75 Inch Long
27	26-8M0204693	SEAL
28	31-30956T	BEARING, Needle
29	26-14077	SEAL, Oil
30	26-8M0204670	SEAL
31	8M0030784	WASHER, Keyed
32	53-8M0168885	RETAINER BEARING CARRIER
33	23-8M0187255	SLEEVE, Propeller Bore

▶Gear Housing, Propeller Shaft, Standard (32 parts)

Ref	OEM Part #	Part Name
-	1600-8M0099910	GEARCASE HOUSING ASSY, Complete, XL Comment: SeaPro
1	1600-8M0099907	GEARCASE HOUSING ASSY, Basic Comment: SeaPro
2	43-8M0096704	GEAR SET, Forward/Pinion Comment: 2 degree
3	31-8M0057742	BEARING, Needle
4	53-8M0071554	RING, Retaining
5	31-8M0057724	BEARING ASSY, ROLLER, TAPERED
6	NSS	NOT SOLD SEPARATE, Cup
7	15-47397A1	SHIM SET
8	8M0032320	FOLLOWER, Cam, Right Hand
9	8M0031224	CAM, Shift
10	8M0057749	ROD, Clutch Actuator
11	30-8M0054823	BALL BEARING, .2500 dia, NLA - No Longer Required
12	24-8M0058020	SPRING, Compression .305 OD, NLA - No Longer Required
13	30-8M0054824	BALL BEARING, .3125 dia, NLA - No Longer Required
14	24-8M0047945	SPRING, Retaining
15	52-8M0045760	CLUTCH, Sliding, 6 Jaw
16	17-8M0045759	PIN, Cross
17	44-8M0088077	SHAFT, Propeller, Right Hand
18	23-824108	SPACER
19	43-8M0096705	GEAR ASSEMBLY, Reverse
20	30-88957T	BEARING, Ball
21	8M0030779	THRUST RING
22	25-8M0030845	O-RING, 3.975X.210
23	8M0219208	SPOOL, Bearing Carrier
24	31-30956T	BEARING, Needle
25	10-8M0077071	SCREW/SEAL KIT, .75 Inch Long
26	26-8M0204693	SEAL
27	26-14077	SEAL, Oil
28	26-12224	SEAL, Fish Line Cutting
29	8M0030784	WASHER, Keyed
30	53-8M0168885	RETAINER BEARING CARRIER
31	23-8M0187255	SLEEVE, Propeller Bore

▶Ignition (4 parts)

Ref	OEM Part #	Part Name
1	300-8M0044991	COIL, Ignition Dual Output
2	10-8M0103808	SCREW, (M6 x 30 MM) Stainless Steel
3	8M0057769	SPARK PLUG WIRE, Set of 4
4	33-8M0204728	SPARK PLUG, NGK ZFR5F

▶Integrated Air Fuel Module (10 parts)

Ref	OEM Part #	Part Name
1	8M0096295	BELL MOUTH ASSEMBLY Comment: SeaPro
2	8M6002428	FUEL INJECTOR
3	879150A09	SEAL KIT
4	8M2001570	CLIP
5	8M0185617	FUEL RAIL
6	10-897445501	SCREW, (M6 x 20 MM)
7	10-895054	SCREW, (M4 x 16 MM)
8	54-855228	CLAMP, (25.6 mm)
9	891663001	SENSOR ASSEMBLY, Temperature
10	8M0094621	RESTRICTOR Comment: SeaPro

▶Integrated Air Fuel Module Components (25 parts)

Ref	OEM Part #	Part Name
1	10-897445501	SCREW, (M6 x 20 MM)
2	8M0149609	THROTTLE BODY ASSEMBLY
3	8M0125617	SENSOR, Position
4	10-8M0063490	SCREW, (M4 X .7 X 16 MM)
5	8M0057685	INTAKE MANIFOLD ASSEMBLY
6	8M0035337	SEAL, Port
7	25-8M0038429	SEAL, Throttle Body
8	8M0084746	LINK ROD ASSEMBLY
9	8M0084742	SOCKET
10	54-899145	CLIP, Tie Strap
11	10-8M0154652	SCREW, M6X1X40 HEX FLNG HD
12	10-895054	SCREW, (M4 x 16 MM)
13	8M0047951	BRACKET, Map
14	854445	SENSOR, MAP
15	10-8M0037204	SCREW, Nylon, push in
16	54-22740	CLIP
17	10-8M0071815	BOLT
18	12-897937	WASHER
19	13-898093	WASHER, Wave
20	8M0033987	CAM THROTTLE ASSEMBLY
21	24-897535005	SPRING, Throttle Cam Return
22	12-897936	WASHER
23	8M0075924	LEVER THROTTLE FOLLOWER ASSY
24	23-8M0215006	BUSHING
25	897526T	IAC VALVE

▶Lower Cowl (38 parts)

Ref	OEM Part #	Part Name
-	8M0057760	PANEL ASSEMBLY, Rear
1	8M0109220	SEAL, Top Cowl
2	100-8M0057756	CHAP ASSEMBLY, Port and Starboard
3	8M0047717	PLATE, Ingress Mounting
4	10-8M0047718	SCREW, (M5 X 8MM)
5	10-8M0230977	SCREW, (M6 x 25 MM)
6	8M0142713	CAP, Chap Support
7	8M0204727	ADAPTER, Rigging Hose
8	8M0204729	INGRESS GROMMET
9	25-8M0048006	GROMMET, Trim Wires
10	100-8M0057758	LOWER COWL FRONT ASSY
11	8M0047810	RETAINER, Top Cowl Latch
12	10-8M0103805	SCREW, (M6 x 16 MM) Stainless Steel
13	100-8M0093776	COVER, Upper Mount - Port
14	100-8M0093777	COVER, Upper Mount - STBD
15	10-892073002	SHOULDER SCREW, (M6)
16	10-8M0071078	SCREW, M6 X 85 MM
17	8M0034063	PANEL, REAR
18	8M0041031	REAR LATCH ASSEMBLY
19	8M0006054	RETAINER
20	8M0047782	HANDLE LATCH
21	37-8M0043701	M-ICON, 39MM - Small
22	8M0031367	LATCH LINK, Rear
23	17-8M0034065	PIN, Handle
24	10-8M0103807	SCREW, (M6 x 25 MM) Stainless Steel
25	23-8M0047796	BUSHING
26	12-8M0214930	WASHER
27	8M0056980	SEAL, Rear Latch
28	25-8M0048008	GROMMET, Trim Sensor Wires
29	87-8M0037225	TRIM SWITCH, Round Bezel
30	8M0032848	RETAINER
31	8M0215105	PLUG
32	25-8M0219168	SEAL, Flush Plug Pocket
33	22-885361A01	FITTING ASSEMBLY, Flush
34	8M0224266	TETHER
35	10-88552550	SCREW, (M6 x 50 MM) Stainless Steel
36	10-8M0103806	SCREW, (M6 x 20 MM) Stainless Steel
37	8M0062583	GROMMET Comment: Rigging Tube (Accessory)

▶Oil Sump (10 parts)

Ref	OEM Part #	Part Name
1	27-8M0038753	GASKET, DSH/ADP Plate
2	8M0057714	OIL COOLER
3	27-8M0046588	GASKET, Cooler to Sump
4	8M0219205	OIL SUMP
5	10-8M0103809	SCREW, (M6 x 40 MM) Stainless Steel
6	19-8M0112869	OIL PLUG ASSEMBLY
7	25-85045	O-RING, (.551 x .070)
8	25-62706	O-RING, (.426 x .070)
9	25-8M0036228	O-RING, (8.1 X 1.6)
10	8M0034754	SEAL, Oil Tank

▶Power Trim Assembly (7 parts)

Ref	OEM Part #	Part Name
1	8M0168241	TRIM SUBASSEMBLY, With lower bushings
2	23-8M0063891	BEARING KIT, Lower Trim Pin
3	17-8M0161313	PIN, Rod Eye Assembly
4	97-8M0057772	ANODE
5	12-8M0204649	WASHER, (.281 x .500 x .060) Stainless Steel
6	10-8M0204707	SCREW, (M6 x 25)
7	17-8M0031192	PIN, Trim Pivot

▶Power Trim Assembly, Components (22 parts)

Ref	OEM Part #	Part Name
-	8M0057770	O-RING KIT, COMPLETE
1	8M0060140	TRIM ASSEMBLY MOTOR KIT
2	NSS	NOT SOLD SEPARATE, O-ring
3	10-82494830	SCREW, (M6 x 30)
4	13-400256	LOCKWASHER, (M6)
5	8782451	DRIVESHAFT
6	8M0060127	TRIM ASSEMBLY PUMP KIT
7	NSS	NOT SOLD SEPARATE, Screw
8	NSS	NOT SOLD SEPARATE, O-ring
9	NSS	NOT SOLD SEPARATE, O-ring
10	NSS	NOT SOLD SEPARATE, Bushing
11	8M0060126	TRIM ASSEMBLY PO CHECK KIT
12	35-8M0060143	TRIM ASSEMBLY FILTER KIT
13	8M0060128	RELIEF VALVE KIT
14	8M0060141	MANUAL RELEASE KIT
15	19-811613	PLUG ASSEMBLY
16	NSS	NOT SOLD SEPARATE
17	8M0060146	MEMORY PISTON KIT
18	NSS	NOT SOLD SEPARATE, O-ring
19	8M0060145	SHOCK ROD ASSEMBLY
20	NSS	NOT SOLD SEPARATE, O-ring
21	10-8M0177279	SCREW, 5/16-24 X .5

▶Service/Support Manual (1 parts)

Ref	OEM Part #	Part Name
-	61-8M0122812	SHORT BLOCK ASSEMBLY

▶Shift Linkage (18 parts)

Ref	OEM Part #	Part Name
1	899044	LATCH
2	53-27290	RING, Retaining
3	8M0031453	ROLLER
4	12-8M0050560	WASHER
5	10-8M0103807	SCREW, (M6 x 25 MM) Stainless Steel
6	824015	CUP, Barrel Retainer
7	8M0125617	SENSOR, Position
8	10-4001186	SCREW, (M4 X 13) HEX WASH HD SS
9	8M0030886	BRACKET ASSY, Shift Link, Painted
10	8M0001157	PIN, Bow Tie Clip
11	11-401386	NUT, (M6) Stainless Steel
12	12-35462	WASHER, (.2656 x .625 x .0625) Stainless Steel
13	8M0031454	LINK, Shift
14	23-8M0035249	BUSHING, (6.452 MM ID) Flanged
15	8M0203756	SHIFT SHAFT ASSEMBLY
16	23-8M0063632	BUSHING, Flanged, Bronze
17	8M0032570	LEVER, Sensor
18	888823001	SHIFT DETENT ASSEMBLY

▶Starter Motor/Oil Filter/Sensors, Starter Labeled 8M0074530 (20 parts)

Ref	OEM Part #	Part Name
1	35-877761K01	FILTER, Oil Mercury Branded
2	8M0039451	TRAY, Oil Filter Drain
3	19-8M0143229	PLUG, Oil Tray
4	10-40011106	SCREW, (M5 x 13) Stainless Steel
5	8M0082988	SENSOR, Crank position
6	8M0148668	SENSOR ASSEMBLY, Block water temp
7	10-8M0188530	SCREW, (M8 X 80)
8	10-88552645	SCREW, (M8X45)
9	12-43430	WASHER
10	23-8M0154659	MOUNT - TUBULAR 8MM, Component of Starter 8M0096343
11	50-8M0187292	STARTER, Isolation Mount - Painted
12	23-8M0070369	SPACER , (8.3 I.D. X 11.8 O.D.), Component of Starter 8M0096343
13	10-40011126	SCREW, (M6 x 13) Stainless Steel
14	10-81893420	SCREW, (M8 x 20)
15	71-8M0142688	PRESSURE SENSOR, Oil
16	84-8M0056666	GROUND STRAP, Starter
17	10-40011126	SCREW, (M6 x 13) Stainless Steel
18	10-8M0012661	SCREW
19	22-8M0073011	FITTING
20	23-8M0070368	SPACER , (8.3 I.D. X 11.8 O.D.), Component of Starter 8M0096343

▶Starter Motor/Oil Filter/Sensors, Starter Labeled 8M0079328 (20 parts)

Ref	OEM Part #	Part Name
1	35-877761K01	FILTER, Oil Mercury Branded
2	8M0039451	TRAY, Oil Filter Drain
3	19-8M0143229	PLUG, Oil Tray
4	10-40011106	SCREW, (M5 x 13) Stainless Steel
5	8M0082988	SENSOR, Crank position
6	8M0148668	SENSOR ASSEMBLY, Block water temp
7	10-8M0188530	SCREW, (M8 X 80)
8	10-88552645	SCREW, (M8X45)
9	12-43430	WASHER
10	8M0073891	MOUNT
11	50-8M0080274	STARTER, Isolation Mount - Painted
12	23-8M0054682	SPACER
13	10-40011126	SCREW, (M6 x 13) Stainless Steel
14	10-81893420	SCREW, (M8 x 20)
15	71-8M0142688	PRESSURE SENSOR, Oil
16	84-8M0056666	GROUND STRAP, Starter
17	10-40011126	SCREW, (M6 x 13) Stainless Steel
18	10-8M0012661	SCREW
19	22-8M0073011	FITTING
20	23-8M0047039	SPACER

▶Swivel Bracket and Swivel Pin, Non SeaPro (40 parts)

Ref	OEM Part #	Part Name
-	8M0081029	KIT, Extreme Duty Mount
1	10-8M0065195	SCREW, M14x2.0-115 HX FLG HD
2	10-8M0065195	SCREW, (M14x2x115) Hex Flange
3	10-8M0069689	SCREW, (M10x1.5x40) Hex Flange
4	NSS	NOT SOLD SEPARATE, Extreme Duty Mounts
5	8M0133457	STEERING TUBE ASSEMBLY
6	11-896602	NUT, (M14)
7	10-847401	SCREW, (#10-24 x .380)
8	54-24836	CLIP
9	12-8M0084612	C-WASHER
10	8M0076463	TRIM SENSOR ASSEMBLY
11	12-89302	WASHER, (.203 x .406 x .040)
12	10-852368	SCREW, (#10-24 x .750)
13	1400-8M0220953	SWIVEL BRACKET ASSEMBLY
14	23-8M0059091	BEARING, Tilt pin 26.38IDX42LG
15	22-8M0169589	FITTING, Grease
16	23-8M0220988	BUSHING, Swivel Tube Pivot
17	26-8M0034870	SEAL, Swivel Tube
18	12-816432	THRUST WASHER
19	10-4000325	SCREW, (M6 x 8)
20	8M0057726	YOKE, Bottom
21	12-825190	WASHER
22	10-8M0069492	BOLT, (M14x2x155) Hex Flange
23	NSS	NOT SOLD SEPARATE, Extreme Duty Lower Mounts
24	12-8M0219210	WASHER, Lower Mount Snubber
25	12-8M0069499	WASHER
26	8M0062747	CABLE ASSEMBLY
27	11-896602	NUT, (M14)
28	10-4000326	SCREW, (M6 x 12)
29	8M0050047	CABLE ASSEMBLY
30	12-8M0204649	WASHER, (.281 x .500 x .060) Stainless Steel
31	8M0049816	RETAINER, Trim Lead
32	23-8M0081024	SPLIT JOURNAL BEARING Comment: SN# 2B063782 & Up
33	53-67684	RING, Retaining
34	10-8M0069689	SCREW, (M10x1.5x40) Hex Flange
35	10-4010610	SCREW, (M6 x 10) Stainless Steel
36	92876A12	LINK ROD ASSEMBLY
37	10-849838	SCREW, (.375-24 x 1.250)
38	11-8M0204726	NUT, (.375-24) Brass
39	12-37828	WASHER, (.390 x .625 x .062) Stainless Steel

▶Swivel Bracket and Swivel Pin, SeaPro (40 parts)

Ref	OEM Part #	Part Name
1	10-8M0065195	SCREW, (M14x2x115) Hex Flange
2	12-8M0052629	WASHER, Upper Mount Snubber
3	12-8M0096222	WASHER, UPPER MOUNT Comment: SeaPro
4	10-8M0069689	SCREW, (M10X1.5X40) Hex Flange
5	8M0096244	MOUNTS - UPPER Comment: SeaPro
6	8M0133457	STEERING TUBE ASSEMBLY
7	11-896602	NUT, (M14)
8	10-847401	SCREW, (#10-24 x .380)
9	54-24836	CLIP
10	12-8M0084612	C-WASHER
11	8M0076463	TRIM SENSOR ASSEMBLY
12	12-89302	WASHER, (.203 x .406 x .040)
13	10-852368	SCREW, (#10-24 x .750)
14	1400-8M0220953	SWIVEL BRACKET ASSEMBLY
15	23-8M0059091	BEARING, Tilt pin 26.38IDX42LG
16	22-8M0169589	FITTING, Grease
17	23-8M0220988	BUSHING, Swivel Tube Pivot
18	26-8M0034870	SEAL, Swivel Tube
19	12-816432	THRUST WASHER
20	10-4000325	SCREW, (M6 x 8)
21	8M0057726	YOKE, Bottom
22	12-825190	WASHER
23	10-8M0069492	SCREW, M14X2.00 X 155 HEX FLG HD
24	8M0057725	LOWER MOUNT ASSEMBLY
25	12-8M0219210	WASHER, Lower Mount Snubber
26	12-8M0069499	WASHER, Lower Mount Snubber 14.4ID, Lower Mount Snubber
27	8M0062747	CABLE ASSEMBLY
28	11-896602	NUT, (M14)
29	10-4000326	SCREW, (M6 x 12)
30	8M0050047	CABLE ASSEMBLY
31	12-8M0204649	WASHER, (.281 x .500 x .060) Stainless Steel
32	8M0049816	RETAINER, Trim Lead
33	23-8M0081024	SPLIT JOURNAL BEARING
34	53-67684	RING, Retaining
35	10-8M0069689	SCREW, (M10X1.5X40) Hex Flange
36	10-4010610	SCREW, (M6 x 10) Stainless Steel
37	92876A12	LINK ROD ASSEMBLY
38	10-849838	SCREW, (.375-24 x 1.250)
39	11-8M0204726	NUT, (.375-24) Brass
40	12-37828	WASHER, (.390 x .625 x .062) Stainless Steel

▶Tachometer Kits, Transom and Helm Mount (16 parts)

Ref	OEM Part #	Part Name
-	79-8M0095037	TACKOMETER KIT, 7 K -Helm Mount (Black)
1	79-8M0104733	TACKOMETER KIT, Transom Mount
2	84-8M2100452	HARNESS, Data Extension 10 Pin
3	8M0099412	GAUGE HOUSING
4	NSS	NOT SOLD SEPARATE, TACHOMETER 7K - Black
5	8M0214969	BEZEL, (85 mm) Black
6	10-895054	SCREW, (M4 x 16 MM)
7	10-14742	SCREW, (.250-20 x 1.25)
8	10-57807	SCREW, (#10-16 x .750) Stainless Steel
9	8M0084613	C WASHER
10	54-22875	CLIP
11	8M0214940	TIE STRAP, (5.50 Inches)
12	79-8M0097226	TACKOMETER KIT, Helm Mount
13	84-8M0055044	HARNESS, Tachometer, V 6.0
14	NSS	NOT SOLD SEPARATE, TACHOMETER 7K - Black
15	8M0214969	BEZEL, (85 mm) Black

▶Tools (12 parts)

Ref	OEM Part #	Part Name
-	NSS	NOT SOLD SEPARATE, Installer Pilot
1	91-8M0039811	MANDREL, Right hand rotation
2	91-8M0045643	BEVELED CROSS PIN TOOL
3	91-8M0045644	PIN STOP INSTALLATION TOOL
4	91-8M0045645	ACTUATOR ASSEMBLY TOOL
5	91-8M0060057	MANDREL, Left hand rotation
6	91-8M0057712	PINION HEIGHT TOOL KIT
7	91-8M0057767	TOOL KIT,BEARING CUP/ADPT
8	91-8M0061797	TRIM PRESSURE TOOL, Bottom
9	25-8M0062937	O-RING SET, Complete for both tools
10	91-8M0062360	TOOL, Drive Bearing Removal
11	91-8M0083568	TOOL KIT, Trim Pin Bearing

▶Top Cowl (7 parts)

Ref	OEM Part #	Part Name
-	37-8M0098615	DECAL SET, SeaPro 150HP
1	8M0075368	TOP COWL ASSEMBLY, Mariner, Non Decaled
2	8M0031345	STRIKER ASSEMBLY
3	10-8M0103805	SCREW, (M6 x 16 MM) Stainless Steel
4	8M0052967	HOOK, Top cowl latch
5	10-8M0103804	SCREW, (M6 x 12 MM) Stainless Steel
6	12-8M0214930	WASHER

▶Transom Bracket (34 parts)

Ref	OEM Part #	Part Name
1	8M0007470	KNOB
2	17-8M0021914	PIN , (.125 x 30 mm)
3	24-830900	SPRING, Compression
4	23-8M0054598	BEARING, Tilt Lock .05 inch ID FLG
5	11-826135	NUT, (1.00-14) Nylon Insert
6	25-45711	O-RING, (.612 x .103)
7	826125A1	TILT TUBE
8	1400-8M0057721	TRANSOM BRACKET, Port, Painted
9	17-893709	PIN
10	24-830899	SPRING, Tension
11	8M0088801	LEVER ASSY, Tilt Lock
12	8M0062746	CABLE ASSEMBLY
13	10-4000325	SCREW, (M6 x 8)
14	12-8M0084612	C-WASHER
15	54-8M0051768	CLAMP, Cable .375
16	1400-8M0061365	BRACKET, Transom STBD, paint
17	10-8M0204730	SCREW, (.500-20 x 5.00 HX HD)
18	12-8M0204665	WASHER, (.530 x .870 x .105) Stainless Steel
19	12-8M0204648	WASHER, (1.5 x 3.05 x 0.13) Stainless Steel
20	11-82671117	NUT, (.500-20)
21	12-8M0057591	WASHER, Thrust
22	10-8M0041013	SCREW, M8X1.25 HEX HD
23	12-8M0054606	WASHER, Flat 31.69 OD X 9.01 ID X 3.048 THK
24	8M0050046	CABLE ASSEMBLY
25	10-4010610	SCREW, (M6 x 10) Stainless Steel
26	11-826164	NUT, (.875-14)
27	8M0072610	TILT LOCK LEVER KIT-F150, (L) (XL) (CXL)
28	23-8M0054598	BEARING, Tilt Lock .05 inch ID FLG
29	17-8M0021914	PIN , (.125 x 30 mm)
30	8M0007470	KNOB
31	8M0059532	TRIM LIMIT MODULE
32	54-816311T	TIE STRAP, (8.00 Inches)
33	13541	PLUG, Male
34	23-8M0059091	BEARING, Tilt pin 26.38IDX42LG

▶Water Separating Fuel Filter Kit, Without WIF Sensor-SeaPro (6 parts)

Ref	OEM Part #	Part Name
-	8M0097838	FUEL FILTER KIT Comment: SeaPro
1	8M0095674	BASE ASSEMBLY, Fuel Filter
2	NSS	NOT SOLD SEPARATE, Fuel Filter Assembly
3	22-8M0204657	PLUG, (.375-18) Hex - Steel
4	22-8M0204732	CONNECTOR, Barb
5	54-8M0188618	CLAMP, Worm Gear (11-18 mm)

100-Hour / Annual Service Checklist

Regular maintenance keeps your Mercury 150 (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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