Mercury 9.8 (2 CYL.)(International) (0N007788 THRU 0N055109) Parts & Diagrams

OEM and aftermarket replacement parts for Mercury 9.8 (2 CYL.)(International). Scroll down for exploded parts diagrams (19), specifications, and maintenance reference.

Mercury 9.8 (2 CYL.)(International) (0N007788 THRU 0N055109) Parts & Diagrams

🔎 Mercury 9.8 (2 CYL.)(International) Reference Library — Exploded parts diagrams (19 diagrams), specifications, common issues, and maintenance checklist.

The Mercury 9.8 (2 CYL.)(International) is a 4-Stroke, Inline 2-Cylinder, EFI outboard motor. A popular choice for small fishing boats, inflatable RIBs, and sailboat auxiliaries.

Quick Reference Specifications

Specification Value
Engine Type 4-Stroke, Inline 2-Cylinder, EFI
Horsepower 10 HP
Displacement 209 cc
Bore x Stroke 55 mm x 44 mm
Spark Plug (Type & Gap) NGK DCPR6E
Engine Oil Capacity 0.8 L (27 fl oz)
Recommended Engine Oil SAE 10W-30 Mercury 4-Stroke Outboard Oil
Gear Case Oil Capacity 320 mL (10.8 fl oz)
Idle Speed (in gear) 900 RPM
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 9.8 (2 CYL.)(International):

  • 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 9.8 (2 CYL.)(International).

Accessories (7 parts) Accessories
Ref OEM Part # Part Name
1 84-853799A4 CABLE ASSEMBLY, Yellow
2 84-853799A3 CABLE ASSEMBLY, White
3 803799A1 IGNITION CHECKER
4 804977T01 ALTERNATOR SET
6 84-17175 HARNESS ASSEMBLY
7 8M0123939 RECTIFIER KIT
8 8M0059840 ATTACHING KIT, Remote Control
Carburetor (49 parts) Carburetor
Ref OEM Part # Part Name
- 27-8M0146271 GASKET SET, Powerhead Comment: (8 SeaPro)
1 3303-803687T03 CARBURETOR Comment: (8 SeaPro)
2 8036922 MAIN NOZZLE Comment: (8 SeaPro)
3 98,8036882 JET, Main Comment: (8 SeaPro)
4 48 JET, Pilot (#803689 2) Comment: (8 SeaPro)
5 16252 CAP
6 16253 FLOAT
7 898101063 FLOAT VALVE
8 853721 PIN, Valve
9 54-16255 CLIP
10 17-16256 PIN
11 10-162571 SCREW
12 803691T01 FLOAT BOWL
13 25-16259 O-RING
14 10-162601 SCREW
15 10-16261 SCREW, Drain
16 27-16262 GASKET
17 10-16263 SCREW
18 24-16264 SPRING
19 10-8129351 SCREW, Pilot Adjust
20 24-16266 SPRING
21 16268 BODY, Pump
22 21-16269 CHECK VALVE
25 16272 COVER, Pump
26 10-162606 SCREW
27 27-16274 GASKET
28 16275 DIAPHRAGM
29 16325 DIAPHRAGM
30 27-16326 GASKET
31 855540 COVER, Carburetor
32 27-855541 GASKET
33 27-8555411 GASKET
34 10-855542 SCREW
35 27-16327 GASKET
36 23-8537151 SPACER
37 10-855809003 BOLT, (M6 x 85)
38 13-400256 LOCKWASHER, (M6)
39 12-953921 WASHER, Stainless Steel
40 8036971 SILENCER, Air
41 35-8M0157133 FILTER, Fuel
42 32-804889130 TUBING
43 32-804889130 TUBING
44 25-162262 GROMMET
45 54-95395 CLIP, Stainless Steel
46 22-853736 CONNECTOR, Fuel
47 11-17480 NUT
48 8M0155129 ROD, Choke
49 25-16332 GROMMET
50 16333 ROD, Snap
Clamp and Swivel Brackets (47 parts) Clamp and Swivel Brackets
Ref OEM Part # Part Name
1 3406-9622T6 CLAMP BRACKET, Starboard
2 3406-96231 CLAMP BRACKET, Port
3 10-898101337 BOLT
4 11-95374 NUT, (M8)
5 12-16192 WASHER
6 12-95375 WASHER
7 161931 DISTANCE PLATE
8 10-16194 SCREW
9 24-161951 SPRING
10 10-16196 SCREW
11 12-16197 WASHER
12 16198004 THRUST ROD
13 24-8150931 SPRING
14 10-16200 CLAMP SCREW ASSEMBLY
15 NSS NOT SOLD SEPARATE, Clamp Screw
16 NSS NOT SOLD SEPARATE, Pin
17 12-95379 PAD
18 3407-803772T01 SWIVEL BRACKET
19 803773T01 SHAFT, Steering
20 8037741 THRUST PLATE
21 25-8126412 O-RING
22 23-163366 BUSHING
23 162052 FRICTION PLATE
24 24-953831 SPRING
25 10-4000354 SCREW, (M8 x 30)
26 8037753 RUBBER, Mount
27 8037781 RUBBER, Damper
28 803776T08 BRACKET, Mount, Starboard
29 803776T09 BRACKET, Mount, Port
30 10-8M0102279 BOLT, Stainless Steel
31 8037754 RUBBER, Mount, Lower (Side)
32 8037755 RUBBER, Mount, Lower (Front)
33 815094A04 STOPPER ASSEMBLY, Tilt
34 NSS NOT SOLD SEPARATE, Grip
35 825113 BUSHING
36 24-813028 SPRING
37 16210002 SET PLATE
38 10-8230427 BOLT
39 22-824969 FITTING, Grease
40 808599 CAP
41 8040451 LOCK, Reverse
43 53-953181 E RING
44 24-804905 SPRING
45 8037871 LINK, Reverse Lock
46 853748 SNAP, Link Rod
47 804906 JOINT
48 18-8150267 COTTER PIN
Cowling (22 parts) Cowling
Ref OEM Part # Part Name
1 4000-803791T01 BOTTOM COWL
2 10-16705 BOLT
3 12-16826 WASHER, Stainless Steel
4 162181 HOOK LEVER
5 26-16219 SEAL
6 23-16220 BUSHING
7 13-16221 WAVE WASHER
8 16222 COVER HOOK
9 10-8230427 BOLT
10 12-953921 WASHER, Stainless Steel
11 12-953922 WASHER
12 25-16226 GROMMET
13 25-162312 GROMMET
14 25-162284 GROMMET
15 25-16823 GROMMET
16 114-8M0062861 TOP COWL ASSEMBLY (8 SeaPro)
17 25-162282 SEAL, Rubber
18 803793T02 TILT HANDLE
19 11-400212 NUT, (M6) Stainless Steel
20 12-16826 WASHER, Stainless Steel
21 13-400256 LOCKWASHER, (M6)
22 8M0130233 SEAL, Rubber
Crankshaft, Pistons and Connecting Rods (20 parts) Crankshaft, Pistons and Connecting Rods
Ref OEM Part # Part Name
- 803679A3 SHORT BLOCK ASSEMBLY Comment: (8 SeaPro)
1 474-8M0047721 CRANKSHAFT ASSEMBLY
2 474-804885T01 CRANKSHAFT
3 474-804885T02 CRANKSHAFT
4 474-804885T03 CRANKSHAFT
5 474-804885T04 CRANKSHAFT
6 8036731 PIN, Crank
7 629-803674T01 CONNECTING ROD
8 31-8036751 BEARING, Needle
9 30-16049 BEARING, Ball
10 26-85370711 SEAL, Oil
11 8537122 THRUST PLATE
12 30-16049 BEARING, Ball
13 26-898101285 SEAL, Oil
14 31-8036752 BEARING, Needle
15 779-804886T05 PISTON Comment: (0.5 Oversize)
16 39-8M0080354 RING, Piston Comment: (0.5 Oversize), services one piston
17 41-8036801 PIN, Piston
18 53-16057 CLIP
19 28-16053 KEY
Cylinder Block (33 parts) Cylinder Block
Ref OEM Part # Part Name
- 803679A3 SHORT BLOCK ASSEMBLY Comment: (8 SeaPro)
1 878-803660T04 CYLINDER BLOCK Comment: (8 SeaPro)
2 17-16119 PIN, Dowel
3 22-8M0064617 CONNECTOR Comment: SN# 0N010765 & Up
4 22-812960006 NIPPLE Comment: SN# 0N010765 & Up
5 10-166983 BOLT
6 10-166984 BOLT
7 10-166985 BOLT
8 12-809931044 WASHER
9 10-8150687 BOLT
10 12-4002217 WASHER
11 32-898101272 HOSE, Rubber with Arrow (730mm) Comment: SN# 0N010765 & Up
12 32-898101272 HOSE, Rubber with Arrow (730mm) Comment: SN# 0N010765 & Up
13 54-95224 CLIP
14 979-803662T02 CYLINDER HEAD Comment: (8 SeaPro)
15 27-8M0146268 GASKET
16 10-166985 BOLT
17 12-809931044 WASHER
18 8M0228411 THERMOSTAT
19 33-17719547 SPARK PLUG, (NGK#BPR7HS-10)
20 8036662 COVER, Exhaust
21 8036664 COVER, Exhaust Comment: (8 SeaPro)
22 27-803663027 GASKET Comment: (8 SeaPro)
23 10-8150683 BOLT
24 12-809931044 WASHER
25 1100-853713T02 HEAD, Crank Case
26 27-8M0147008 GASKET
27 26-85370712 SEAL, Oil
28 26-85370710 SEAL, Oil
29 23-8537155 SPACER
30 10-167051 BOLT
31 27-8M0151533 GASKET
32 54-813275 CLAMP
Driveshaft Housing (10 parts) Driveshaft Housing
Ref OEM Part # Part Name
- 27-8M0082883 GASKET SET, Lower Unit
1 1599-804902T HOUSING, Driveshaft (Long)
2 10-8M0147119 BOLT
3 27-803663028 GASKET
4 17-161191 PIN, Dowel
5 25-161181 GROMMET
7 27-803728002 GASKET
8 10-82304231 BOLT
9 84-898101091 CABLE ASSEMBLY, Ground
10 10-8230427 BOLT
Electric Start Kit (1 parts) Electric Start Kit
Ref OEM Part # Part Name
- 87-804981 MAIN SWITCH ASSEMBLY
Electrical (22 parts) Electrical
Ref OEM Part # Part Name
1 261-804976T01 FLYWHEEL CUP
2 8M0135298 PLATE ASSEMBLY, Coil
3 804988T COIL, Exciter
5 804990 HOLDER
6 10-8230314 SCREW
7 803704T01 CD UNIT
8 85-855543 BOOT, With Resistance
9 NSS NOT SOLD SEPARATE, Terminal
10 23-8537156 SPACER
11 10-16705 BOLT
12 10-168308 BOLT
13 12-16826 WASHER, Stainless Steel
14 804890T SET PLATE
15 10-16194 SCREW
16 8048911 STOPPER Comment: (8 SeaPro)
17 10-8555441 SCREW
18 11-16071 NUT
19 12-16072 WASHER
20 87-823037A2 SWITCH ASSEMBLY, Stop - Lanyard
21 823054 LANYARD
22 261-804976T FLYWHEEL CUP Comment: (Electric)
23 804977T01 ALTERNATOR SET Comment: (Electric)
Fuel Tank Assembly(Plastic 3.2 Gallon) (16 parts) Fuel Tank Assembly(Plastic 3.2 Gallon)
Ref OEM Part # Part Name
NS 27-8169771 GASKET, Fuel Cap
1 1260-859061A1 TANK ASSEMBLY, Fuel (Plastic)
2 823535 GAUGE/CAP ASSEMBLY
3 22-8M0175544 CONNECTOR KIT, Fuel
4 25-823533 O-RING
5 35-823534 SCREEN
6 32-8M0126969 FUEL LINE ASSEMBLY
7 54-853798 CLAMP
8 22-8M0120628 CONNECTOR, Fuel, Engine End
9 13330Q07 BULB ASSEMBLY, Primer
10 21-13331A3 CHECK VALVE ASSEMBLY (Inlet)
11 21-13331A4 CHECK VALVE ASSEMBLY (Outlet)
12 41582-10 CLAMP (Large)
13 54-41582Q7 CLAMP, Nylon (Small)
14 22-89771Q2 CONNECTOR, (.250-18), Fuel Tank
15 54-41582Q7 CLAMP, Nylon
Gear Housing(Driveshaft) (29 parts) Gear Housing(Driveshaft)
Ref OEM Part # Part Name
- 27-8M0082883 GASKET SET, Lower Unit
1 1668-803729T04 GEAR HOUSING ASSEMBLY, Basic
2 31-8036753 BEARING, Needle
3 10-8M0147119 BOLT
4 22-8M0229353 PLUG
5 22-8M0229353 PLUG
6 27-95220 GASKET
7 97-823913Q ANODE
8 10-16832 BOLT, (M6 x 16)
9 45-803738T16 DRIVESHAFT (Long)
10 30-161326 BEARING, Ball
11 43-8M0156176 GEAR, Pinion
12 47-8M0214945 IMPELLER
13 17-9521811 PIN, Roll - Stainless Steel
14 46-803750A02 HOUSING, Water Pump - Upper
15 8037511 LINER, Stainless Steel
16 8037531 GUIDE PLATE, Stainless Steel
17 27-8M0072137 GASKET
18 27-8M0072138 GASKET
19 10-879194305 BOLT, Stainless Steel
20 12-16826 WASHER, Stainless Steel
21 46-803750A01 HOUSING, Water Pump - Lower
22 27-8M0072139 GASKET
23 26-95348 SEAL, Oil
24 15-8537955 SHIM
25 32-8037552 PIPE, Water (Short)
27 25-804903 GROMMET
28 16165 RETAINER
29 10-823042 BOLT
Gear Housing, Propeller Shaft (23 parts) Gear Housing, Propeller Shaft
Ref OEM Part # Part Name
- 27-8M0082883 GASKET SET, Lower Unit
1 1668-803729T04 GEAR HOUSING ASSEMBLY, Basic
30 30-8037331 BEARING, Ball
31 43-8M0156174 GEAR, Forward
32 43-8M0156178 GEAR, Reverse
33 12-16140 WASHER
34 15-813277 SHIM, (0.15)
35 44-8M0070782 PROPELLER SHAFT
36 52-8037451 CLUTCH
37 17-16150 PIN, Clutch
38 24-892777002 SPRING, (51 mm)
39 16152 FOLLOWER, Cam
40 8537642 RETAINER
41 803732T03 CARRIER ASSEMBLY, Bearing
42 25-16131 O-RING
43 26-16130 SEAL, Oil
44 30-16128 BEARING, Ball
45 10-167051 BOLT
46 8M0131240 THRUST HOLDER
47 48-897614A10 PROPELLER, (7)
48 11-16147 PROP NUT
49 18-815026 COTTER PIN
50 12-16146 WASHER
Gear Shift (20 parts) Gear Shift
Ref OEM Part # Part Name
- 27-8M0082883 GASKET SET, Lower Unit
1 8M0090459 CAM
2 18-8150263 COTTER PIN
3 8037602 CAM ROD Comment: (Short)
4 23-16176 BUSHING
5 25-161771 O-RING
6 25-16178 O-RING
7 8037631 LEVER, Shift
8 25-8037591 GROMMET
9 804904 LOCK LEVER, Starter
10 23-163361 BUSHING
11 8037681 LEVER, Shift Rod
12 54-851863 CLIP
13 24-8M0138736 STOPPER
14 10-8107551 BOLT
15 8M0138737 CLAMP
16 8037662 SHIFT ROD
17 8037671 JOINT
18 18-8150263 COTTER PIN
19 53-953182 E RING
Inlet Manifold (6 parts) Inlet Manifold
Ref OEM Part # Part Name
- 803679A3 SHORT BLOCK ASSEMBLY Comment: (8 SeaPro)
1 804887T MANIFOLD, Inlet
2 27-803663032 GASKET, Inner
3 27-803663026 GASKET, Outer
4 803686T02 VALVE ASSEMBLY, Reed
5 803686T02 REED VALVE SET
Recoil Starter (31 parts) Recoil Starter
Ref OEM Part # Part Name
1 803716T02 STARTER ASSEMBLY, Recoil
2 803716T HOUSING, Starter
3 24-812645T SPRING SET, Starter
4 812633 SHEEVE, Starter
5 24-812634 SPRING, Return
6 8M0060217 RATCHET
7 24-812636 SPRING, Friction
8 10-8M0060218 BOLT
9 812638 FRICTION PLATE
10 50-12066Q10 ROPE
11 812640 HANDLE, Starter Rope
12 812641 RETAINER
13 161101 PLATE, Seal
14 812642 PULLEY, Starter
15 10-168281 SCREW AND LOCKWASHER
16 17634 LOCK, Starter
17 10-8555449 SCREW
18 23-895130 COLLAR
19 24-812645007 SPRING
20 8037211 CAM
21 13-17641 WAVE WASHER
22 10-855544 SCREW
23 898101933 ROD, Snap
24 8036815 LOCK ROD, Starter
25 10-16705 BOLT
26 13-400256 LOCKWASHER, (M6)
27 8049001 BRACKET, Starter Comment: (Port)
28 8049002 BRACKET, Starter Comment: (Starboard)
29 10-168282 BOLT
30 54-813275 CLAMP
31 23-855545 COLLAR
Service\Support Materials (1 parts) Service\Support Materials
Ref OEM Part # Part Name
- 37-804994A00 DECAL SET (8/9.8)
Steering Handle (22 parts) Steering Handle
Ref OEM Part # Part Name
1 16075T4 HANDLE, Steering
2 23-8518584 BUSHING
3 12-804508 WASHER
4 13-804017 WAVE WASHER
5 804896 STOPPER
6 16-815028 STUD BOLT
7 13-400256 LOCKWASHER, (M6)
8 11-400212 NUT, (M6) Stainless Steel
9 8M0065582 GRIP
10 16093 SHAFT, Throttle
11 23-16191 SPACER
12 23-16336 BUSHING
13 10-16094 SCREW
14 16338 BRACKET
15 10-16827 SCREW
16 813026 FRICTION PIECE
17 10-16087 SCREW, Adjusting
18 12-16826 WASHER, Stainless Steel
19 11-400212 NUT, (M6) Stainless Steel
20 804898 WIRE, Throttle
21 25-804899 GROMMET
22 37-8M0097201 DECAL
Throttle Linkage (12 parts) Throttle Linkage
Ref OEM Part # Part Name
2 804892 DRUM, Throttle
3 8M0102999 HOLDER
4 10-16059 SCREW
5 804894 ARM, Throttle
6 853744001 BALL JOINT
7 853745 CAP
8 11-16081 NUT
9 11-400212 NUT, (M6) Stainless Steel
10 8036814 LINK ROD, Advancer
11 853748 SNAP, Link Rod
12 8M0102314 ROD, Throttle Link
13 16333 ROD, Snap
Tools (7 parts) Tools
Ref OEM Part # Part Name
0 91-8M0059838 TOOL, Flywheel Stripper Comment: (Not Shown)
1 91-895195A01 PULLER KIT, Needle Roller Bearing
2 91-8031332 FLANGE
3 91-8031333 SHAFT
4 12-1614010 WASHER
5 11-85372220 NUT
6 91-8031336 FLANGE

100-Hour / Annual Service Checklist

Regular maintenance keeps your Mercury 9.8 (2 CYL.)(International) running reliably season after season. Most of these tasks can be performed with basic tools and the factory service manual.

  1. Replace water pump impeller and inspect wear plate
  2. Change engine oil and oil filter (check drain plug washer)
  3. Replace spark plugs and check ignition timing
  4. Drain and refill lower unit gear oil; inspect for water contamination
  5. Inspect fuel lines, primer bulb, and fuel filter for deterioration
  6. Check and replace sacrificial anodes (zinc or aluminum)
  7. Inspect propeller for damage; check shaft seal and cotter pin
  8. Check valve clearance (refer to service manual for specifications)
  9. Lubricate all grease points (steering, tilt tube, shift linkage)
  10. 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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