Mercury 100 (4 CYL.) (9523034 THRU 9793576) Parts & Diagrams

🔎 Mercury 100 (4 CYL.) Reference Library — Exploded parts diagrams (28 diagrams), specifications, common issues, and maintenance checklist.

The Mercury 100 (4 CYL.) is a 4-Stroke, Inline 4-Cylinder, EFI, SOHC 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, EFI, SOHC
Horsepower	100 HP
Displacement	2064 cc
Bore x Stroke	90 mm x 81 mm
Spark Plug (Type & Gap)	NGK IZFR6F-11
Engine Oil Capacity	5.2 L (5.5 quart)
Recommended Engine Oil	Mercury FourStroke Oil 10W-30
Gear Case Oil Capacity	710 mL (24 fl oz)
Idle Speed (in gear)	650–700 RPM (in gear)
Full Throttle RPM Range	5000-6000
Fuel	Unleaded Gasoline, 87 Octane min.

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

Common Issues & Recommended Parts

Below are common maintenance scenarios for the Mercury 100 (4 CYL.):

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 100 (4 CYL.).

▶Attenuator Plate (24 parts)

Ref	OEM Part #	Part Name
-	27-13461A99	GASKET SET
1	27-151724	GASKET
2	44342A1	COVER
3	10-48409	SCREW, (#10-16 x .625) Stainless Steel
4	NLA	No Longer Available, Gasket, Old Design
5	44340A2	PLATE, Attenuator
6	12-4002217	WASHER
7	11-826365	NUT
8	39519	CUP
9	98889	LATCH
10	10-42975	DRIVE SCREW
11	32-9912878	HOSE, (.187) (26.00 Inches Bulk)
12	54-816311T	TIE STRAP, (8.00 Inches)
13	22-17762	REDUCING TEE
14	98886T01	LINK
15	44336	LINK, Throttle, Upper
16	98887T	LINK, Throttle, Main
17	10-48409	SCREW, (#10-16 x .625) Stainless Steel
18	12-8M0204666	WASHER, (.203 x .500 x .032)
19	193859	LINK ROD
20	11399A1	ARM ASSEMBLY
21	10-40056103	SCREW, (M5 x 6)
22	12-8M0204666	WASHER, (.203 x .500 x .032)
23	67748	ROLLER

▶Carburetor (27 parts)

Ref	OEM Part #	Part Name
-	27-13461A99	GASKET SET
1	3301-9012T80	CARBURETOR, 115-WME-21B
2	NSS	NOT SOLD SEPARATE, Gasket
3	NSS	NOT SOLD SEPARATE, Retaining Ring
4	1395-811693	BOWL, Fuel (WME-20A&B/21A&B)
5	1395-9591	SHAFT, Throttle (WME-1/3/4)
6	19270	SHAFT, Throttle (WME-2)
7	813619	VALVE, Throttle (115)
8	1395-9594	FLOAT
9	NSS	NOT SOLD SEPARATE, Float Shaft
10	1395-879194011	VALVE, Inlet Needle
11	1395-811694	PLUG KIT (WME-20A&B/21A&B)
12	NSS	NOT SOLD SEPARATE, Gasket
13	NSS	NOT SOLD SEPARATE, Gasket
14	27-151724	GASKET
15	NSS	NOT SOLD SEPARATE, Screw
16	1395-811220	SCREW, Cover Plate (WME-20/21)
17	1395-808612	SCREW
18	1395-811221	COVER PLATE (WME-20/21)
19	1395-6680	JET, (.078) (115)
20	NSS	NOT SOLD SEPARATE, Idle Needle
21	NSS	NOT SOLD SEPARATE, Gasket
22	NSS	NOT SOLD SEPARATE, Spring
23	NSS	NOT SOLD SEPARATE, Spring
24	NSS	NOT SOLD SEPARATE, Spring
25	NSS	NOT SOLD SEPARATE, Idle Needle
26	NSS	NOT SOLD SEPARATE, Plug

▶Cowl Mounting Brackets (26 parts)

Ref	OEM Part #	Part Name
1	11189A2	BRACKET ASSEMBLY, Oyster
2	193861	SEAL, Bracket, Oyster
3	42935	SEAL
4	11244	RESTRAINT
5	10-400015	SCREW, (M5 x 10)
6	12-42118	WASHER
7	429071	CONNECTOR, Oyster
8	32-8M0108349	TUBING
9	54-816311T	TIE STRAP, (8.00 Inches)
10	932642	HOUSING
11	10-8M0103817	SCREW
12	12-817274	WASHER, (.344 x 1.00 x .063) Stainless Steel Comment: (Cylinder Block Cover Casting Number 1035-9195C2)
13	12-8M0204690	WASHER, (.344 x .688 x .065) Stainless Steel Comment: (Cylinder Block Cover Casting Number 1035-9195C1)
14	23-143951	BUSHING Comment: (Cylinder Block Cover Casting Number 1035-9195C2)
15	25-88033	GROMMET Comment: (Cylinder Block Cover Casting Number 1035-9195C2)
16	10-400038	SCREW, (M5 x 30)
17	12-42118	WASHER
18	42952T6	BRACKET, Front, Oyster
19	67260	SEAL
20	25-67272	GROMMET
21	99447	RETAINER
22	10-69011	SCREW, (#10-32 x 1.00)
23	10-40011151	SCREW, (M8 x 35) Stainless Steel
24	12-817274	WASHER, (.344 x 1.00 x .063) Stainless Steel
25	25-88033	GROMMET
26	23-143951	BUSHING

▶Cowls And Front Cover (33 parts)

Ref	OEM Part #	Part Name
-	38-17996	EMBLEM, Port/Starboard
1	2188-9264A3	TOP COWL ASSEMBLY, Port, Oyster
2	429404	SEAL
3	12401	SEAL, Rear
4	90274	SEAL
5	429581	SHIELD OYSTER
6	10-48409	SCREW, (#10-16 x .625) Stainless Steel
7	12-89302	WASHER, (.203 x .406 x .040)
8	112031	SOUND BLANKET
9	2187-9263A2	TOP COWL ASSEMBLY, Starboard, Oyster
10	26-60297	SEAL
11	11206A1	OIL LEVEL GAUGE ASSEMBLY
11A	11-65110	NUT
12	42957	SHIELD
13	10-48409	SCREW, (#10-16 x .625) Stainless Steel
14	12-89302	WASHER, (.203 x .406 x .040)
15	112041	SOUND BLANKET
16	193681	SEAL, (3.20 Inch), Oyster
17	879851	BRACKET, Lower
18	879871	BRACKET, Upper
19	10-4010725	SCREW, (M8 x 25)
20	120811	LATCH, Cowl
21	10-48409	SCREW, (#10-16 x .625) Stainless Steel
22	47341A11	ROPE AND HANDLE KIT, Manual/Emergency Start, Manual Starting
23	11207A2	COVER ASSEMBLY, Oyster
24	12356	BUMPER
25	24-17288	SPRING
26	43137A1	BRACKET ASSEMBLY
27	11-434181	SPEED NUT
28	15432	RETAINER
29	17-43134	PIN
30	10-48409	SCREW, (#10-16 x .625) Stainless Steel
31	134741	SOUND BLANKET

▶Crankshaft, Pistons And Connecting Rods (#638-8532--1) (21 parts)

Ref	OEM Part #	Part Name
-	17791T92	POWERHEAD ASSEMBLY, Complete Comment: (IncludesCylinder Block And Crankcase, Pistons, Connecting Rods And Bearings, ETC.
1	473-9193T3	CRANKSHAFT ASSEMBLY
1A	786611	WEAR SLEEVE
2	30-43011T	BEARING, Ball, Lower
3	53-93412	RING, Retaining, Old Design
4	28-91800	KEY, Woodruff
5	43-43019A1	GEAR ASSEMBLY
6	39-42079A4	RING ASSEMBLY
7	25-35126	O-RING, (.859 x .139)
8	42943A1	BEARING ASSEMBLY, Roller
9	777-9009A7	PISTON ASSEMBLY Comment: (.030 Oversize)
10	53-857196	RING, Lock
11	39-96170A4	RING SET, Piston Comment: (.030 Oversize)
12	638-9002A6	CONNECTING ROD ASSEMBLY
13	12-8M0032839	WASHER
14	29-8M0204715	NEEDLE, Roller Bearing
15	10-94320	SCREW, (.375-24 x 1.250)
16	31-844338A01	BEARING/CAGE KIT
17	31-43013T3	BEARING ASSEMBLY, Roller, Upper
18	26-8M0214932	SEAL, Oil
19	25-823683	O-RING

▶Crankshaft, Pistons And Connecting Rods (646-818846) (20 parts)

Ref	OEM Part #	Part Name
-	17791T92	POWERHEAD ASSEMBLY
1	473-9193T3	CRANKSHAFT ASSEMBLY
2	30-43011T	BEARING, Ball, Lower
3	786611	WEAR SLEEVE
4	25-35126	O-RING, (.859 x .139)
5	39-818412A4	RING ASSEMBLY
6	28-91800	KEY, Woodruff
7	43-43019A1	GEAR ASSEMBLY
8	42943A1	BEARING ASSEMBLY, Roller
9	777-815965A6	PISTON ASSEMBLY Comment: (.030 Oversize)
10	53-857196	RING, Lock
11	39-96170A4	RING SET, Piston Comment: (.030 Oversize)
12	646-818846T6	CONNECTING ROD ASSEMBLY
13	12-8M0012298	WASHER
14	29-8M0214954	BEARING, Needle
15	10-94320	SCREW, (.375-24 x 1.250)
16	31-844338A01	BEARING ASSEMBLY, Roller
17	31-43013T3	BEARING ASSEMBLY, Roller, Upper
18	26-8M0214932	SEAL, Oil
19	25-823683	O-RING

▶Cylinder Block And Crankcase (46 parts)

Ref	OEM Part #	Part Name
1	877-9191T13	CYLINDER BLOCK ASSEMBLY
2	10-4009680	SCREW, (M10 x 80)
3	17-8M0036405	PIN, Bearing Race
4	17-43044	PIN, Dowel
5	428841	COVER, Top
6	76867	COVER, Bottom
7	10-81742750	SCREW, (M8 x 50)
8	65848	CARRIER
9	25-64872	GROMMET
10	813801A1	CARRIER ASSEMBLY Comment: SN# 00222000 THRU 09999999
11	21-42657A3	CHECK VALVE
12	21-891664	CHECK VALVE
13	16-821676A1	STUD, (M6)
14	12-8M0214963	WASHER, (.406 x .750 x .104)
15	11-40140	NUT, (M10)
16	21-426233	CHECK VALVE, Press-In
17	22-328022	PLUG, Pipe (.125-27)
18	32-892024122	TUBING, (20.00 Feet Bulk)
19	10-82127335	SCREW, (M8 x 35 MM)
20	99162001	BOOT
21	1035-9196A2	COVER
22	27-443284	GASKET
23	10-82127335	SCREW, (M8 x 35 MM)
24	54-814634	CLAMP
25	787991	SENDER, Temperature (37.50 Inch)
26	889733	RETAINER
27	10-48409	SCREW, (#10-16 x .625) Stainless Steel
28	12-8M0204666	WASHER, (.203 x .500 x .032)
29	86596T	POPPET VALVE
30	648771	DIAPHRAGM
31	12-94182	WASHER
32	10-69570	SCREW, (#10-16 x .750)
33	24-42996	SPRING
34	14586	THERMOSTAT (120 Degrees)
35	27-8M0204714	GASKET
36	27-430068	GASKET
37	8M0047619	COVER
38	10-81742755	SCREW, (M8 x 55)
39	14857A16	MODULE ASSEMBLY, Oil Warning
40	10-4010630	SCREW, (M6 x 30) Stainless Steel
41	12415	SENDER, Temperature
42	84-88824A6	CABLE ASSEMBLY, Sea Ray/ Powerboat
43	12621	COVER
44	27-126201	GASKET
45	10-40007106	SCREW, (M5 x 13)
46	12-4002314	WASHER

▶Driveshaft Housing (39 parts)

Ref	OEM Part #	Part Name
-	12092A4	SPACER KIT, Drive Shaft Housing, X-Long, Gray
1	1598-8974T23	HOUSING ASSEMBLY, Driveshaft, Oyster
2	16-903502	STUD, (M10 x 227), X-Long
3	17-23784	PIN, Dowel
4	16-903503	STUD, (M10 x 190), X-Long
5	12-45176	WASHER, Quantity Of Three On Oyster
6	11-40140	NUT, (M10)
7	429222	GUIDE, Non Power Trim
7A	19-158641	PLUG, Power Trim, Oyster
8	22-85822A4	PICKUP ASSEMBLY, Speedometer
9	22-433351	CONNECTOR, 90 Degree (.125-27) Nylon
10	22-85822T	CONNECTOR, Straight
11	14664A2	HOOK ASSEMBLY, Reverse, Non Power Trim
12	16686	PUSH ROD, Non Power Trim
13	99606	SHAFT, Non Power Trim
14	18-45882	COTTER PIN, Non Power Trim
15	23-69132	BUSHING, Non Power Trim
16	24-996261	SPRING, Non Power Trim
17	18-47959	COTTER PIN, Non Power Trim
18	12-8M0042642	WASHER, (.323 x .563 x .063) Stainless Steel, Non Power Trim
19	24-16733	SPRING, Non Power Trim
20	996361	YOKE, Non Power Trim
21	11-82670911	NUT, (.312-24) Stainless Steel, Non Power Trim
22	17-99663	PIN, Clevis, Non Power Trim
23	18-25191	COTTER PIN, Non Power Trim
24	44343T1	MOUNT
25	10-898835001	BOLT, (M12 x 154)
26	12-28051	WASHER, Early Models
27	12-28053	WASHER, Early Models
28	12-30119	WASHER, (.875 Inch Outside Diameter)
29	11-8M0204662	NUT, (M12)
30	88238A10	CABLE ASSEMBLY, Ground
31	10-41508	SCREW, (.250-20 x .500) Stainless Steel
32	8M0036730	CLAMP
33	11-35521	NUT
34	10-40011149	SCREW, (M8 x 25) Stainless Steel
35	67077F1	COVER, Oyster
36	10-88417	SCREW, (#12-24 x .620)
37	18579T6	SPLASH PLATE, Sea Ray, Gray

▶Electrical Components (45 parts)

Ref	OEM Part #	Part Name
-	23-8M0214955	BUSHING
1	443314	IGNITION PLATE
2	332-5772A7	SWITCHBOX ASSEMBLY
3	54-63153	J CLIP
4	10-40011110	SCREW, (M5 x 30) Stainless Steel
5	134731	HOLDER, Fuse, Old Design
6	10-32,11-45076	NUT, Brass
7	84-43442A3	HARNESS ASSEMBLY, Primary
8	84-813715A8	CABLE SET, Ignition
9	85-63709A1	BOOT/TERMINAL KIT
10	33-938	SPARK PLUG Comment: (Canda/Belguim NGK #BPZ8H-N-10) RFI Suppression)
11	10-82155025	SCREW, (M8 x 25 MM) Stainless Steel
12	339-832757A4	COIL ASSEMBLY, Ignition
13	10-32,11-45076	NUT, Brass
14	87554	COVER
15	10-40007114	SCREW, (M5 x 50)
16	12-89302	WASHER, (.203 x .406 x .040)
18	10-40056107	SCREW, (M5 x 16)
19	45067	NUT
20	16731T01	MERCURY SWITCH, Old Design
21	10-40056107	SCREW, (M5 x 16)
22	86-45915	TERMINAL BLOCK
23	10-48408	SCREW, (#10-16 x .500)
24	84-43443A9	HARNESS ASSEMBLY, Engine Wiring Comment: SN# D25461 & Up
25	88-8M0207796	FUSE, 20 Ampere
26	84-88439A4	CABLE ASSEMBLY, Battery - Negative
27	89-817109A2	SOLENOID ASSEMBLY, (#10-32 / .3125-18 Terminals)
28	10-32,11-45076	NUT, Brass
29	13-53166	LOCKWASHER, (.312)
30	11-8M0204668	NUT, (.312-18)
31	10-40007106	SCREW, (M5 x 13)
32	12-4002314	WASHER
33	84-88807A6	CABLE ASSEMBLY, (3.50 Inches) Black
34	84-88808A18	WIRE ASSEMBLY, (3.00 Inches), Red
35	13550T1	COVER
36	10-40011110	SCREW, (M5 x 30) Stainless Steel
37	12-89302	WASHER, (.203 x .406 x .040), Use Where Applicable
38	8M0058226	RECTIFIER
39	17602T02	TERMINAL BLOCK, Gray, See Note
40	815279A2	VOLTAGE REGULATOR KIT Comment: (Use With Black Terminal Block)
41	10-4010630	SCREW, (M6 x 30) Stainless Steel
42	84-12201A2	HARNESS ASSEMBLY Comment: (Use With Black Terminal Block)
43	8M0084173	REGULATOR, Voltage Comment: (2 Females/3 Male Terminals)
44	10-4010635	SCREW, (M6 x 35) Stainless Steel
46	84-821546A3	HARNESS ASSEMBLY Comment: (Use With 815279--3 Voltage Regulator)

▶Exhaust Plate (36 parts)

Ref	OEM Part #	Part Name
1	42954A4	PLATE ASSEMBLY, Exhaust Comment: (115)
2	17-23784	PIN, Dowel
3	42939	SEAL
4	881900T03	MOUNT, (2.375 Inch)
5	10-4010750	SCREW, (M8 x 50)
6	10-898487	BOLT, (M12 x 175)
7	12-32834	WASHER
8	12-8M0204648	WASHER, (1.5 x 3.05 x 0.13) Stainless Steel
9	11-896963	NUT, (M12)
10	10-40011158	SCREW, (M8 x 70) Stainless Steel
11	27-430086	GASKET
12	87917216T	TUBE, Exhaust Comment: (115)
13	10-40011151	SCREW, (M8 x 35) Stainless Steel
14	8M0039075	SEAL
15	32-430142	TUBE, Water, X-Long
16	99019	CLAMP
17	42941001	SEAL, Water Tube, Upper
18	10-4010750	SCREW, (M8 x 50)
19	25-93221002	GROMMET
20	42953A3	BRACKET ASSEMBLY, Lower, Oyster
21	43405	SEAL
22	10-81742750	SCREW, (M8 x 50)
23	23-48237	BUSHING
24	79932A9	SHIFT SHAFT ASSEMBLY, Upper
25	42912A1	SHIFT LINK
26	23-42994	BUSHING, Single Flange
27	13-29720	WAVE WASHER, Old Design
28	12-24664	WASHER, (M4 x 20), Old Design
29	11-401386	NUT, (M6)
30	23-11289	SPACER, X-Long
31	43053	COUPLING, Non Power Trim
32	43585	COUPLING, Power Trim
33	17243A1	TUBE ASSEMBLY, Water - Extension, X-Long
34	25-8M0204645	O-RING, (.796 x .139), X-Long
35	26-38970	SEAL, X-Long
36	25-8M0179867	GROMMET, Old Design

▶Flywheel And Starter Motor (19 parts)

Ref	OEM Part #	Part Name
1	19-45907	PLUG, Yellow
2	42956A1	COVER ASSEMBLY
3	79022	MARKER
4	10-37572	SCREW, (.190-32 x .380)
5	12-72761	WASHER, (.203 x .562 x .060) Stainless Steel
6	11-42979	NUT, (M16)
7	12-33001	WASHER, (.641 x 1.250 x .190)
8	261-859236T12	FLYWHEEL ASSEMBLY
9	398-9710A45	STATORS Comment: (Stamped 398-9710A15 Or 398-9710A31)
10	10-4007325	SCREW, (M5 x 25)
11	99021A6	TRIGGER ASSEMBLY
12	50-893892T	STARTER MOTOR ASSEMBLY
13	23-8M0034918	COLLAR
14	8M0043376	STOP
15	84-93388A1	CABLE ASSEMBLY, (6.00 Inches) Black
16	10-69035	SCREW AND LOCKWASHER, (.250-20 x .625) Stainless Steel
17	84-93388A6	WIRE, Black
18	13-26992	LOCKWASHER, (.250) Stainless Steel
19	11-64015	NUT, (.250-20)

▶Fuel Pump(Use With 90 Degree Check Valve Reference #16) (42 parts)

Ref	OEM Part #	Part Name
-	27-13461A99	GASKET SET
1	14360A78	PUMP ASSEMBLY, Fuel
2	42909A4	DIAPHRAGM KIT
3	NSS	NOT SOLD SEPARATE, Check Valve
4	NSS	NOT SOLD SEPARATE, Gasket, Boost
5	NSS	NOT SOLD SEPARATE, Diaphragm
6	NSS	NOT SOLD SEPARATE, Gasket, Pulse
7	NSS	NOT SOLD SEPARATE, Spring
8	NSS	NOT SOLD SEPARATE, Cap
9	NSS	NOT SOLD SEPARATE, Check Valve
10	NSS	NOT SOLD SEPARATE, Retainer
11	NSS	NOT SOLD SEPARATE, Spring
12	NSS	NOT SOLD SEPARATE, Cap
13	27-8M0204705	GASKET
14	98768	BASE
15	98775A1	PLATE
16	21-424811	CHECK VALVE
17	22-19688	FITTING
18	10-82104540	SCREW
19	10-40057134	SCREW, (M6 x 50)
20	32-8M0108349	TUBING Comment: (D = To Carburetor)
21	35-816296Q2	FILTER, Fuel
22	8M0214940	TIE STRAP, (5.50 Inches)
23	22-816856Q3	CONNECTOR ASSEMBLY, Fuel - Plastic
24	25-145091	GROMMET
25	10-4010635	SCREW, (M6 x 35) Stainless Steel
26	89-819503A2	VALVE, Enrichner
27	32-1430165	TUBING, (38.00 Inches Bulk) Comment: (A = To Lower Tee) (B = To Upper Tee)
28	10-F1887	CLAMP
30	22-19688	FITTING Comment: (C = To Crankcase)
31	32-8M0108355	LINE, (57.00 Inches Bulk)
32	24-68434	SPRING, Old Design
33	22-17607	TEE FITTING
34	19-17608	FLOW RESTRICTOR
35	22-830570	TEE FITTING
36	32-892024122	TUBING, (20.00 Feet Bulk)
37	35-8M0207786	FILTER, Fuel
38	14687A4	PUMP ASSEMBLY, Accelerator, Repair Kit, 1395-811287
39	10-4009416	SCREW, (M6 x 16)
40	12-69056	WASHER, (.255 x .620 x .030) Stainless Steel
41	54-8M0214911	CLAMP, (15.7), Old Design, New Design Use Reference Number 22
42	22-56800	PLUG, Pipe (.0625-27), Non Oil Injection

▶Fuel Pump(Use With Inline Check Valve Reference Number 24) (40 parts)

Ref	OEM Part #	Part Name
-	17791T92	POWERHEAD ASSEMBLY
1	27-13461A99	GASKET SET
2	21-857005A1	DIAPHAGM KIT
3	NSS	NOT SOLD SEPARATE, Check Valve
4	NSS	NOT SOLD SEPARATE, Gasket, Boost
5	NSS	NOT SOLD SEPARATE, Diaphragm
6	NSS	NOT SOLD SEPARATE, Gasket, Pulse
7	NSS	NOT SOLD SEPARATE, Spring
8	NSS	NOT SOLD SEPARATE, Cap
9	NSS	NOT SOLD SEPARATE, Check Valve
10	NSS	NOT SOLD SEPARATE, Retainer
11	NSS	NOT SOLD SEPARATE, Spring
12	NSS	NOT SOLD SEPARATE, Cap
13	27-8M0204705	GASKET
14	144303	BASE
15	987752	PLATE
16	22-996642	ELBOW
17	10-82104540	SCREW, Fuel Pump
18	10-40057134	SCREW, (M6 x 50), Pump To Block
19	32-8M0108349	TUBING Comment: (E = To Carburetor)
20	22-996642	ELBOW Comment: (D = To Crankcase)
21	54-816311T	TIE STRAP, (8.00 Inches)
22	35-816296Q03	FILTER, Fuel
23	32-822554	MOLDED HOSE Comment: (Old Design Y-Connector And Tubing Are Replaced With Molded Hose Ad Connector Reference Number 23 And 26 For Improvement Of Leakage Problems.
24	22-8189941	CHECK VALVE
25	32-82381335	TUBING, (8.00 Inches) Comment: (C = To Oil Pump)
26	22-822771	CONNECTOR
27	22-816856Q3	CONNECTOR ASSEMBLY, Fuel - Plastic
28	25-145091	GROMMET
29	10-4010635	SCREW, (M6 x 35) Stainless Steel
30	32-1430165	TUBING, (38.00 Inches Bulk) Comment: (A = To Lower Tee) (B = To Upper Tee)
31	19-17608	FLOW RESTRICTOR
32	22-830570	TEE FITTING
33	32-892024122	TUBING, (20.00 Feet Bulk)
34	35-8M0207786	FILTER, Fuel
35	14687A4	PUMP ASSEMBLY, Accelerator, Repair Kit, 1395-811287
36	10-4009416	SCREW, (M6 x 16)
37	12-69056	WASHER, (.255 x .620 x .030) Stainless Steel
38	89-819503A2	VALVE, Enrichner
39	54-18887	CLAMP

▶Gear Housing, Driveshaft (43 parts)

Ref	OEM Part #	Part Name
-	1667-9011G42	GEAR HOUSING ASSEMBLY, X-Long, Oyster
1	1667-9011T74	GEAR HOUSING ASSEMBLY, Oyster
2	17-8M0084244	PIN, Dowel - With Hole (.375 x .625) , Front, Quantity Of Two On X-Long
3	10-28653	SCREW, (#10-32 x 0.25), New Design Used For Reference Number 6, 7
4	19643	SEAL
5	10-79953Q04	SCREW, (.375-16 x .250), Magnetic
6	12-191833	WASHER, Fiber
7	22-8M0058389	SCREW, Magnetic
8	17-43044	PIN, Dowel - Without Hole (.375 x .625), Rear, Quantity Of Two On X-Long
9	97-31640Q4	TRIM TAB
10	10-825427	SCREW, (.437-14 x 1.250)
11	12-45176	WASHER, (.453 x .812 x .105) Stainless Steel
12	43040T1	CARRIER ASSEMBLY
12A	43046	TUBE, Oiler
13	43-881259A1	GEAR ASSEMBLY, Pinion
14	11-35921	NUT, (.625-18)
15	760394	CAM, Shift Control
16	31-42677A1	BEARING ASSEMBLY, Tapered Roller
17	15-44492A1	SHIM SET
18	45-43032A4	DRIVESHAFT ASSEMBLY, X-Long
19	42461A1	SLEEVE/RING KIT
20	43055A4	COVER ASSEMBLY, Aluminum Cover
21	27-8M0214931	GASKET, Aluminum Cover
22	26-43036	SEAL, Oil, Lower, Plastic Cover
23	26-43035	SEAL, Oil, Upper, Plastic Cover
24	27-430331	GASKET, Aluminum Cover
25	27-430341	GASKET, Aluminum Cover, Plastic Cover
26	817275A2	HOUSING KIT, Upper Water Pump Comment: (Use Without Reference Number 30 And 31)
27	8M0204709	FACEPLATE, Use Without Reference Number 30 And 31
28	10-40011130	SCREW, (M6 x 30) Stainless Steel, Use Without Reference Number 30 And 31
29	8M0204658	SEAL, Use Without Reference Number 30 And 31
30	12-4002315	WASHER, (6.60 X 12.5 X 1.5 mm -SS), Use With Reference Number 30 And 31
31	23-8M0204659	INSULATOR, Use With Reference Number 30 And 31
32	28-8M0204723	KEY
33	47-43026T2	IMPELLER
34	10-8M0204707	SCREW, (M6 x 25)
35	12-8M0204649	WASHER, (.281 x .500 x .060) Stainless Steel
36	43049A1	SHIFT SHAFT ASSEMBLY, X-Long
37	53-29641	E RING
38	23-43052A4	BUSHING ASSEMBLY
39	25-8M0204681	O-RING, (1.424 x .103)
40	26-8M0204708	SEAL, Oil
41	10-8M0204741	SCREW, (M6 x 20) Stainless Steel

▶Gear Housing, Propeller Shaft (26 parts)

Ref	OEM Part #	Part Name
-	1667-9011G42	GEAR HOUSING ASSEMBLY, X-Long, Oyster
1	1667-9011T74	GEAR HOUSING ASSEMBLY, Oyster
42	31-30894A1	BEARING SET, Cup And Cone
44	31-30895T	BEARING, Needle
45	850315A1	FOLLOWER KIT, Cam
45A	30-44530	BALL
46	24-30622	SPRING
47	52-822539T	CLUTCH
48	17-8M0100263	PIN, Cross
49	24-30893	SPRING
50	44-12238T	PROPELLER SHAFT
52	8M0168901	CARRIER ASSEMBLY, Bearing
53	25-8M0214974	O-RING, (3.609 x .139)
54	31-30956T	BEARING, Needle
55	26-8M0204670	SEAL, Inner
56	26-8M0205729	SEAL, Oil, Outer
57	31-12578T	BEARING, Needle
58	12-12577	THRUST WASHER
59	31-12576	BEARING, Thrust
60	16-8M0034456	STUD, (M8 x 48)
61	12-8M0042642	WASHER, (.323 x .563 x .063) Stainless Steel
62	11-401378	NUT, (M8)
63	15-44491A1	SHIM SET
64	13191Q01	THRUST WASHER
65	14-816629Q	TAB WASHER
66	11-52707Q1	PROP NUT KIT, (.750-16)

▶Induction Manifold And Reed Block (43 parts)

Ref	OEM Part #	Part Name
1	27-8127755	GASKET, Use With 44324C2 And 44325C2
2	44324T1	PLATE, Baffle, Casting Number 44324C2 Comment: Use With 44324C2 And 44325C2
3	27-8127754	GASKET, Use With 44324C2 And 44325C2
4	44325A1	COVER, Casting Number 44325C2 Comment: (Use With 44324C2 And 44325C2)
5	22-996642	ELBOW
6	42881A1	SHIFT RAIL ASSEMBLY
7	14-42981	TAB WASHER
8	10-40001134	SCREW, (M8 x 25)
9	988851	SLIDE
10	23-42994	BUSHING
11	13-29720	WAVE WASHER
12	12-35462	WASHER, (.2656 x .625 x .0625) Stainless Steel
13	11-401386	NUT, (M6)
14	12-35459	WASHER
15	11-401386	NUT, (M6)
16	1169-858552T2	END CAP ASSEMBLY, Lower
17	21-426585	CHECK VALVE
18	26-41953	SEAL
19	25-89224	O-RING
20	10-4010825	SCREW, (M10 x 25) Hex Flange - Stainless Steel
21	27-430075	GASKET
22	13545A1	MANIFOLD ASSEMBLY, Induction
23	42923	BRACKET
24	10-82127335	SCREW, (M8 x 35 MM)
25	10-81742740	SCREW, (M8 x 40)
26	16-8M0045410	STUD
27	12-8M0204663	WASHER
28	12-8M0204666	WASHER, (.203 x .500 x .032)
29	11-816874	WING NUT
30	16-824470	STUD
31	27-134612	GASKET
32	13460	COVER
33	10-81742755	SCREW, (M8 x 55)
34	8M0219198	REED BLOCK ASSEMBLY
35	27-139376	GASKET
36	34-43018A1	REED SET
37	14-429821	TAB WASHER
38	42924	RETAINER
39	10-4000171	SCREW, (M6 x 16)
40	22-130351	FITTING, Straight
41	32-1430165	TUBING, (38.00 Inches Bulk)
42	22-13033	TEE FITTING
43	10-82127335	SCREW, (M8 x 35 MM)

▶Miscellaneous Parts/Accessories (1 parts)

Ref	OEM Part #	Part Name
-	90-18151900	OWNERS GUIDE Comment: (Sea Ray)

▶Oil Injection Components (28 parts)

Ref	OEM Part #	Part Name
1	1256-8628A7	TANK ASSEMBLY, Oil
2	99160001	BOOT, Upper
3	NLA	No Longer Available, Cover, Old Design
4	988952	BRACKET, Upper
5	10-4010630	SCREW, (M6 x 30) Stainless Steel
6	36-42653A3	CAP ASSEMBLY
7	27-42999T	GASKET
8	10-12896	SCREW, (#8-18 x .310)
9	87-12886A6	SWITCH ASSEMBLY
10	43-430204	GEAR, Driven
11	25-8M0204667	O-RING
12	32-82381335	TUBING, (8.00 Inches) Comment: (A = To Fuel Pump)
13	44345T3	PUMP, Oil
14	17335A3	ADAPTOR ASSEMBLY
15	23-17597	BUSHING
16	23-17596	BUSHING
17	10-82104540	SCREW
18	42888	BRACKET, Oil Tank Base
19	25-56291	GROMMET
20	10-82155050	SCREW, (M8 x 50) Stainless Steel
21	99161	BOOT
22	8M0214940	TIE STRAP, (5.50 Inches)
23	32-82381455	TUBING, Use With Reference Number 25
24	22-73318	TEE, Plastic
25	22-44456	FITTING, Three Hole
26	32-9004934	TUBING, (14.50 Inches Bulk), Use With Reference Number 25
27	54-814200	CLAMP, Use With Reference Number 25
28	12-8M0204666	WASHER, (.203 x .500 x .032)

▶Power Trim Components(Single Ram Power Trim) (38 parts)

Ref	OEM Part #	Part Name
-	8M0171817	PUMP ASSEMBLY, Trim
1	8M0171821	SHOCK ROD ASSEMBLY
2	813428	END CAP ASSEMBLY, Trim Cylinder
3	813432A1	CYLINDER REBUILD KIT
4	810776	PISTON KIT, Memory
5	893916A01	CYLINDER ASSEMBLY, Trim
6	811678A6	SCREW AND SEAL KIT
7	8116707	PUMP/MANIFOLD
8	823180A1	ROCKER ARM
8A	823180A1	ROCKER ARM
9	10-813436	SCREW KIT
10	8116711	DRIVESHAFT
11	811626A3	SEAL KIT, With Case Bolts
12	8116731	RESERVOIR KIT
13	22-8134351	PLUG KIT
14	893929A01	RELIEF VALVE KIT
15	8116241	FRAME AND FIELD KIT
16	8116271	ARMATURE KIT
17	12665	SPRING KIT, Brush
18	811625	BRUSH CARD KIT
19	17-818898	PIN, Anchor
20	17-821539	PIN, Trilobe
21	99625002	SHAFT
22	97-818298Q1	ANODE KIT
23	10-8M0204707	SCREW, (M6 x 25)
24	12-8M0204649	WASHER, (.281 x .500 x .060) Stainless Steel
25	84-17201A2	CABLE ASSEMBLY, (17.00 Inches)
26	10-878607	SCREW, (#10-16 x .380)
27	8M0084613	C WASHER
28	54-22875	CLIP
29	89-8M0185145	SOLENOID ASSEMBLY
30	23-8M0214955	BUSHING
31	25-818967	GROMMET
32	10-40011109	SCREW, (M5 x 25) Stainless Steel
33	12-4002314	WASHER
34	10-69079	SCREW, (#10-16 x .440)
35	8M0084613	C WASHER
36	54-22740	CLIP

▶Power Trim Components(Three Ram Power Trim Design I) (44 parts)

Ref	OEM Part #	Part Name
1	99659A22	MANIFOLD ASSEMBLY, Oyster
2	22-56800	PIPE PLUG
3	41493A7	TRIM CYLINDER ASSEMBLY, Oyster
4	41492A1	GUIDE ASSEMBLY
5	25-41478A1	REPAIR KIT
6	41482A2	CHECK VALVE KIT
7	1100-8M0021648	GUIDE ASSEMBLY
8	878413A1	PISTON/ROD ASSEMBLY, Power Trim, Port
9	35-12184A1	TRIM FILTER ASSEMBLY
10	878414T01	PISTON/ROD ASSEMBLY, Power Trim, Starboard
11	17-821539	PIN, Trilobe, Upper
12	893929A01	VALVE ASSEMBLY
12A	53-815949001	E RING
13	10-4000327	SCREW, (M6 x 14)
14	12-4002315	WASHER
15	99642	COVER
16	25-48462A4	O-RING KIT
17	19-99609A1	PLUG ASSEMBLY
18	99641A1	SHAFT ASSEMBLY
19	22-56800	PIPE PLUG
20	10-4008820	SCREW, (M6 x 20)
21	13-400256	LOCKWASHER, (M6)
22	826729A10	PUMP ASSEMBLY, Power Trim Comment: (Refer To Power Trim Pump Section For Breakdown)
23	99625002	SHAFT
24	97-818298Q1	ANODE KIT
25	10-4000332	SCREW, (M6 x 35)
26	12-8M0204649	WASHER, (.281 x .500 x .060) Stainless Steel
27	8M0045383	STRIKER PLATE
28	13-58643	LOCKWASHER, (.375)
29	11-46335	NUT, (.375-24)
30	84-17201A2	CABLE ASSEMBLY, (17.00 Inches)
31	84-79139A22	WIRE ASSEMBLY
32	89-8M0185146	SOLENOID, Starter (#8-32/.250-20 Terminals)
33	10-40007106	SCREW, (M5 x 13)
34	8-32,11-26419	NUT, Brass
35	13-26992	LOCKWASHER, (.250) Stainless Steel
36	11-64015	NUT, (.250-20)
37	12-4002314	WASHER
38	54-22875	CLIP
39	8M0084613	C WASHER
40	10-69079	SCREW, (#10-16 x .440)
41	17-878267	PIN, Groove, Lower
42	10-4000377	SCREW, (M10 x 30)
43	13-400258	LOCKWASHER, (M10) Stainless Steel

▶Power Trim Components(Three Ram Power Trim Design II) (39 parts)

Ref	OEM Part #	Part Name
-	826729A10	POWER TRIM ASSEMBLY, Complete
1	811604F	MANIFOLD ASSEMBLY
2	22-56800	PIPE PLUG
3	880952A03	TILT CYLINDER ASSEMBLY
4	811608	ROD KIT, Trim And Tilt Piston, Bolt Type
5	823553T	ROD, Trim Piston, Nut Type
6	878239A02	GUIDE KIT
7	811607A1	REPAIR KIT
8	811610A1	CHECK VALVE KIT
9	1100-8M0021648	GUIDE ASSEMBLY
10	878414T01	PISTON/ROD ASSEMBLY, Power Trim, Starboard
11	35-12184A1	TRIM FILTER ASSEMBLY
12	17-821539	PIN, Trilobe
13	893929A01	VALVE ASSEMBY
14	53-815949001	E RING
15	10-4000327	SCREW, (M6 x 14)
16	12-4002315	WASHER
17	811611	COVER
18	811612A3	O-RING KIT
19	19-811613	PLUG ASSEMBLY
20	8M0142997	SHAFT ASSEMBLY
21	22-56800	PIPE PLUG
22	878265A6	TRIM MOTOR Comment: (Refer To Power Trim Motor Section For Breakdown)
23	10-811616	SCREW, Short
24	811617T1	PUMP
25	811619	DRIVESHAFT
26	99625002	SHAFT
27	97-818298Q1	ANODE KIT
28	10-8M0204707	SCREW, (M6 x 25)
29	12-8M0204649	WASHER, (.281 x .500 x .060) Stainless Steel
30	8M0045383	STRIKER PLATE
31	13-58643	LOCKWASHER, (.375)
32	11-46335	NUT, (.375-24)
33	17-878267	PIN, Groove
34	10-4000377	SCREW, (M10 x 30), Manifold
35	13-400258	LOCKWASHER, (M10) Stainless Steel
36	54-22875	CLIP, Pump Wire
37	8M0084613	C WASHER
38	10-69079	SCREW, (#10-16 x .440)

▶Power Trim Motor (6 parts)

Ref	OEM Part #	Part Name
-	878265A6	TRIM MOTOR
1	811624	FRAME AND FIELD KIT
2	811625	BRUSH CARD KIT
3	811623	END FRAME KIT
4	811626	SEAL KIT
5	811627	ARMATURE KIT

▶Power Trim Pump (9 parts)

Ref	OEM Part #	Part Name
-	826729A10	PUMP ASSEMBLY, Power Trim
1	12659	FRAME AND FIELD KIT
2	12665	SPRING KIT, Brush
3	13506	BRUSH CARD KIT
4	12662	PUMP AND END FRAME KIT
5	126631	SEAL KIT, Pump
6	12660	END FRAME KIT
7	12661	ARMATURE KIT
8	12664	THRU BOLT KIT

▶Starter Motor(Bosch) (8 parts)

Ref	OEM Part #	Part Name
-	50-893892T	STARTER MOTOR ASSEMBLY
1	15383	DRIVE KIT
2	13310T1	DRIVE
3	75660	PLATE
4	15384	THRU BOLT
5	15385	ARMATURE
6	898265016	BRUSH/SPRING KIT
7	15386001	END CAP

▶Swivel Bracket and Steering Arm (34 parts)

Ref	OEM Part #	Part Name
1	1499-8710T21	SWIVEL BRACKET ASSEMBLY, Gray
2	26-87735	SEAL, Oil, Lower
3	23-818764	BUSHING
4	25-33466	O-RING
5	23-67668	SPACER
6	22-8M0169589	FITTING, Grease
7	23-821207	BUSHING
8	10-64014	SCREW, (.250-28 x .500)
9	99661A36	SWIVEL PIN ASSEMBLY, Stub End, Gray
10	92876A12	LINK ASSEMBLY, Steering Comment: (Mercury And Mariner)
11	10-849838	SCREW, (.375-24 x 1.25) Comment: (Mercury And Mariner)
12	11-8M0204726	NUT, (.375-24) Comment: (Mercury And Mariner)
13	12-34931	WASHER, (.406 x .734 x .063) Stainless Steel Comment: (Mercury And Mariner)
14	8M0000516	BUMPER, X-Long
15	13-78854	WAVE WASHER
16	42961T2	YOKE ASSEMBLY, Bottom
17	53-67684	RING, Retaining
18	12-67670	WASHER
19	99653	BRACKET Comment: (Not Used With Power Trim)
20	99619	SHAFT, Lower Comment: (Not Used With Power Trim)
21	17-821539	PIN, Trilobe Comment: (Not Used With Power Trim)
22	10-4000377	SCREW, (M10 x 30) Comment: (Not Used With Power Trim)
23	13-400258	LOCKWASHER, (M10) Stainless Steel Comment: (Not Used With Power Trim)
24	97-818298Q1	ANODE KIT Comment: (Not Used With Power Trim)
25	10-4000332	SCREW, (M6 x 35) Comment: (Not Used With Power Trim)
26	12-8M0204649	WASHER, (.281 x .500 x .060) Stainless Steel Comment: (Not Used With Power Trim)
27	55-99724T15	SHOCK ABSORBER, Oyster Comment: (Not Used With Power Trim)
28	23-821207	BUSHING Comment: (Not Used With Power Trim)
29	99625002	SHAFT, Upper Comment: (Not Used With Power Trim)
30	8M0074846	SENDER ASSEMBLY, Trim, Sea Ray
31	10-852368	SCREW, (#10-24 x .750), Sea Ray
32	10,13-26996	LOCKWASHER, Stainless Steel, Sea Ray
33	12-89302	WASHER, (.203 x .406 x .040), Sea Ray
34	11288001	BUMPER, Bottom Yoke, X-Long

▶Swivel Bracket and Steering Arm(8709C6 / 818904C) (18 parts)

Ref	OEM Part #	Part Name
1	3408-818904T2	SWIVEL BRACKET ASSEMBLY, Gray Comment: (Use With Single Ram Power Trim)
2	26-87735	SEAL, Oil, Lower
3	23-818764	BUSHING
4	25-8M0214926	O-RING
5	23-816039	SPACER
6	22-8M0169589	FITTING, Grease
7	23-821207	BUSHING
8	10-64014	SCREW, (.250-28 x .500)
9	99661A36	SWIVEL PIN ASSEMBLY, Gray
10	92876A12	LINK ASSEMBLY, Steering
11	10-849838	SCREW, (.375-24 x 1.25)
12	11-8M0204726	NUT, (.375-24)
13	12-34931	WASHER, (.406 x .734 x .063) Stainless Steel
14	8M0000516	BUMPER, X-Long
15	11288001	BUMPER, Bottom Yoke, X-Long
16	42961T2	YOKE ASSEMBLY, Bottom, Gray
17	53-67684	RING, Retaining
18	12-816432	THRUST WASHER

▶Throttle And Linkage (27 parts)

Ref	OEM Part #	Part Name
1	884309T	LEVER, Throttle
2	10-817582	SCREW, Adjusting (5 mm)
3	11-400211	NUT, (M5) Stainless Steel
4	48039	CAP
5	884307T	LEVER, Spark Advance
6	10-814776	SCREW, Adjusting (M6 x 55)
7	11-400212	NUT, (M6) Stainless Steel
8	42942	CAP
9	16-42986	STUD
10	11-90517	NUT, (M10)
11	23-55171	BUSHING
12	24-73375	SPRING
13	23-812930A1	BUSHING
14	12-42980	WASHER
15	42927	INSERT
16	12-35459	WASHER
17	11-401386	NUT, (M6)
18	878170	SPARK ADVANCE ROD
19	93421	SWIVEL BALL
20	93254	SWIVEL BASE
21	878173	LINK
22	11-401386	NUT, (M6)
23	23-8M0215006	BUSHING
24	14518A2	CAM, Throttle
25	16-8161949	STUD
26	12-69056	WASHER, (.255 x .620 x .030) Stainless Steel
27	10-4007180	SCREW, (M10 x 45), Design II

▶Transom Bracket (28 parts)

Ref	OEM Part #	Part Name
1	3401-8718F8	BRACKET ASSEMBLY, Transom, Starboard, Oyster
2	3400-8716A9	BRACKET ASSEMBLY, Transom, Port, Oyster
3	22-8M0169588	FITTING, Grease, Port
4	17-8M0026068	PIN ASSEMBLY, Tilt Lock, Non Power Trim
5	99170A2	TILT TUBE, Power Trim
6	11-859133	NUT, (1.00-14), Gray
7	25-45711	O-RING, (.612 x .103)
8	13-88750	WASHER
9	11-858869	NUT, (.875-14)
10	10-814259	SCREW, (.500-20 x 4.00)
11	12-24501	WASHER, Upper, Sea Ray
12	11-91962	NUT, (.500-20)
13	8M0115104	LEVER ASSEMBLY, Non Power Trim And Three Ram Power Trim
14	8M0109798	LEVER ASSEMBLY, Tilt Lock, Single Ram Power Trim
15	13-99611	WAVE WASHER
16	23-65830	NYLINER
17	99633	KNOB, Oyster
18	17-99615	PIN, Groove
19	24-99622	SPRING
20	17-99604	PIN, Groove
21	10-96930A1	BOLT ASSEMBLY, Power Trim
22	11-23161	NUT, (.375-24), Power Trim
23	11-8M0041651	NUT, (.875-14), Power Trim
24	818771T8	BRACKET, Anchor, Gray Comment: (Single Ram Power Trim)
25	10-4000377	SCREW, (M10 x 30), Single Ram PowerTrim
26	13-400258	LOCKWASHER, (M10) Stainless Steel, Single Ram Power Trim
27	11-40114	NUT, (M10 x 1.5), Single Ram Power Trim
28	814207	STOP

100-Hour / Annual Service Checklist

Regular maintenance keeps your Mercury 100 (4 CYL.) 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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Mercury 100 (4 CYL.) (9523034 THRU 9793576) Parts & Diagrams

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