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Mercury / Mariner Section   or:   MerCruiser Section 
Troubleshooting Sealers, Tools & Hardware

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Mercury  20HP-70HP Piston, 

Pistons Rings Gaskets&Seals Carb Kits Bearings
Cooling System Electrical System Lower Gear Case

******TOP GUIDED OR NOT TOP GUIDED?******

It's easy to tell by looking at the forging number on the rod. Then check the chart below.
MODEL TOP GUIDED BOTTOM GUIDED
3 & 4 Cyl 646-81884 638-85321
V-6 644-818141 636-8118
 
PISTONS BY HORSEPOWER
9.9HP-70HP 75HP-90HP 90HP-125HP 135HP-150HP  
150HP-175HP  175HP-200HP 200HP-225HP

AVOID DAMAGING YOUR FLYWHEEL AND CRANKSHAFT

FLYWHEEL PULLER

 
Mercury Pistons 9.9HP-70HP
Wiseco forged pistons are superior in strength  due to the inherent nature of both the aluminum alloy and the forging extrusion manufacturing process.
The Pro Parts piston is a cast piston, cast from high silicone aluminum according to original equipment specifications. Most mechanics use a cast piston when available.
The Pro- V Cast piston is a cast piston, cast from high silicone aluminum according to original equipment specifications. Most mechanics use a cast piston when available. Has a gray moly coating to reduce friction and dissipates heat well
The Pro- HP has high quality moly coating on the skirt and comes with a ceramic coated dome. Available wherever PRO - V cast pistons are applicable by special order. Call 941-351-4975 for details.

*All pistons are sold with wrist pins, rings, and clips (unless noted).

**All pistons & kits include one piston only.

Model cyl. Piston Size Bore Size Wiseco Pro Parts Pro-V Cast 

Click to View Price, Image or:

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9.9 - 15 HP 1984 - 1997 2 STD 2.205 3190PS (Wiseco) - -

- 18-4135 (Pro) -

0.020 2.225 3190P2 (Wiseco) - -

- 18-4137 (Pro) -

0.030 2.235 3190P3 (Wiseco) - -

0.040 2.245 3190P4 (Wiseco) - -

15HP 1988 - 1994 B238464-G202749;

15 HP 1988 - 1994         Sea Pro / Marathon  G044365-G202749

20-25 HP 1988 - 1994 D117956-G202749 

20 HP Jet 1988-1994 G044027 - G202749

 

 2

2

 

2

2

 

 STD 2.562 3182PS (Wiseco) - -

0.020 2.582 3182P2 (Wiseco) - -

0.030 2.592 - - - -
0.040 2.602 3182P4 (Wiseco) - -

15 HP Sea Pro / Marathon 1994-2000 Mercasil Block G202750 - G437999

20-25 HP 1994-2000

20 HP JET 1994-2000 G202750 - UP   

Mercasil Block

 2

 

 

 STD 2.562 3183PS (Wiseco) - -

0.020 2.582 3183P2 (Wiseco) - -

0.030 2.592 - - -
0.040 2.602 3183P4 (Wiseco) - -

20HP  1972-79 2 STD 2.565 3144PS (Wiseco) - -

- - 4400V (Pro-v)

.015 2.580 - - - -
- - 4415V (Pro-v)

.020 2.585 3144P2 (Wiseco) - -

- - -  
.030 2.595 3144P3 (Wiseco) - -

- 4430V (Pro-v)

.040 2.605 3144P4 (Wiseco) - -

- - -  
25HP  1984-86

30HP  1984-86

Mariner Only; CHECK BORE SIZE

 2 STD 2.835 586PS (Wiseco) - -

.020 2.854 586P2 (Wiseco) - -

.040 2.874 586P4 (Wiseco) - -

.060 2.894 586P6 (Wiseco) - -

.080

 2.913 586P8 (Wiseco) -

30 HP Jet 1998 - 2002

30-40HP 1994 - 2002

 2 STD 2.992 3179PS (Wiseco) -

0.020 3.012 3179P2 (Wiseco) -

0.030 3.022 3179P3 (Wiseco) -

0.040 3.032 3179P4 (Wiseco) -

35 HP  1984-89 

40HP  1972-83 Crossflow

 2 STD 2.875 3109PS (Wiseco) - -

- 9000 (Pro) -

- - 9000V (Pro-v)

.015 2.890 - - - -
- 9015 (Pro) -

- - 9015V (Pro-v)

.020 2.895 3109P2 (Wiseco) - -

.030 2.905 3109P3 (Wiseco) - -

- 9030 (Pro) -

- - 9030V (Pro-v)

.040 2.915 3109P4 (Wiseco) - -

Pro Parts

40HP  1979-90 Mariner only

 2 STD 2.955 - 11631 (Pro) -

- - 11631V (Pro-v)

.020 2.955 - 11636 (Pro) -

- - 11636V (Pro-v)

40HP  1990-1997

45HP  1986-1989

50HP   1970-85

(Classic Inline 4)

 4   STD 2.565 3144PS (Wiseco) - -

- - 4400V (Pro-v)

.015 2.580 - - - -
- - 4415V (Pro-v)

.020 2.585 3144P2 (Wiseco) - -

- - -  
.030 2.595 3144P3 (Wiseco) - -

- 4430V (Pro-v)

.040 2.605 3144P4 (Wiseco) - -

- - -  
50HP  84-90 3 STD 2.875 3123PS (Wiseco) - -

- 2300 (Pro) -

2300V (Pro-v)

.015 2.890 -- - - -
- 2315 (Pro) -

- - 2315V (Pro-v)

.020 2.895 3123P2 (Wiseco) - -

- - - -
- - - -
.030 2.905 3123P3 (Wiseco) - -

- 2330 (Pro) -

- - 2330V (Pro-v)

.040 2.915 3123P4 (Wiseco) - -

- - - -
- - - -
50HP  84-90, LOW DOME 3 STD 2.875 3123PS (Wiseco) - -

- 2300 (Pro) -

- - 2300V (Pro-v)

.015 2.890 - - -  
- 2315 (Pro) -

- - 2315V (Pro-v)

.020 2.895 3123P2 (Wiseco) - -

- - -  
- - -
.030 2.905 3123P3 (Wiseco) - -

- 2330 (Pro) -

- - 2330v (Pro-v)

.040 2.915 3123P4 (Wiseco) - -

- - -
- - -
40 HP Jet 1997 - 2002

50-60HP 1998 - 2002

 3

3

 STD 2.992 3179PS (Wiseco) -

0.020 3.012 3179P2 (Wiseco) -

0.030 3.022 3179P3 (Wiseco) -

0.040 3.032 3179P4 (Wiseco) -

50HP  91-97 3 STD 2.955 3147PS (Wiseco) - -

.020 2.975 3147P2 (Wiseco) - -

.030 2.985 3147P3 (Wiseco) - -

.040 2.995 3147P4 (Wiseco) - -

60HP  1984-90

Crossflow Low Dome

 3 STD 2.875 3123PS (Wiseco) - -

- 2300 (Pro) -

- - 2300V (Pro-v)

.015 2.890 - - -  
- 2315 (Pro) -

- - 2315V (Pro-v)

.020 2.895 3123P2 (Wiseco) - -

- - -  
- - -
.030 2.905 3123P3 (Wiseco) - -

- 2330 (Pro) -

- - 2330v (Pro-v)

.040 2.915 3123P4 (Wiseco) - -

- - -
- - -
60HP  1991-97 3 STD 2.955 3147PS (Wiseco) - -

.020 2.975 3147P2 (Wiseco) - -

.030 2.985 3147P3 (Wiseco) - -

.040 2.995 3147P4 (Wiseco) - -

65HP  1973-76

70HP  1977-83

Crossflow Low Dome

 3 

3

 

 STD 2.875 3123PS (Wiseco) - -

- 2300 (Pro) -

- - 2300V (Pro-v)

.015 2.890 - - -  
- 2315 (Pro) -

- - 2315V (Pro-v)

.020 2.895 3123P2 (Wiseco) - -

- - -  
- - -
.030 2.905 3123P3 (Wiseco) - -

- 2330 (Pro) -

- - 2330v (Pro-v)

.040 2.915 3123P4 (Wiseco) - -

- - -
- - -
70HP  1987-89

loop charge

 3 STD 3.375 3120PS (Wiseco) - -

- 2611 (Pro) -

- 2611V (Pro-v)

.010 3.385 3120P1 (Wiseco) - -

.015 3.390 - 2613 (Pro) -

- - 2613V (Pro-v)

.020 3.395 3120P2 (Wiseco) - -

.030 3.405 3120P3 (Wiseco) - -

- 2615 (Pro) -

- - 2615V (Pro-v)

.040 3.415 3120P4 (Wiseco) - -

60 HP 1984-90

65HP 1973-76

70HP 1977-83

75HP 1984- 1986

 Crossflow

 

 3

3

3

4

 

 

 STD 2.875 3109PS (Wiseco) - -