Mercury outboard piston kits *Mariner *Force motors

Fully machined hypereutectic pistons
Kits include rings, pin and 2 retainers
Featuring a hard anodizing coating on top
Piston rings and application chart
Hardness : HV 280 - 400
Use with Mercury, Mariner and Force boat motor parts
Lighter weight, lower expansion and longer life 100% cast piston from GLM
Power-head gasket sets are available
Exploded view outboard parts drawings Click here search by part number or description here
Rings, pins and retainers

Crossflow removeable transfer port cover

Crossflow removeable transfer port cover

The oldest design, and the one used on Mercury, Mariner and Force 35-150 hp engines from years 1970 to 1990 is the crossflow piston.

The air-fuel mixture travels through the transfer port and into the cylinder, a deflector, cast into the top of the piston, directs the air-fuel mixture towards the combustion chamber and spark plug tip for maximum efficiency.

Engines with deflectors on top of the pistons will be crossflow engines. External inspection of a crossflow engine will reveal removeable transfer port covers on the side of the cylinders.

Loopcharged

Loopcharged

In 1976 Mercury, Mariner and Force introduced a V6 engine with loopcharged pistons. This engine was the V-175 hp 6 cylinder.

A loopcharged engine has a transfer port cast into the cylinder wall in such a way that it will direct the air-fuel mixture towards the combustion chamber and spark plug tip without the need for a deflector. Engines with a flat top or a slight dome on the top of the pistons will be loopcharged.

Loopcharged engines will not have removable transfer port covers on the side of the cylinders.

4 stroke four cycle engines are fairly new to the marine industry. They have become the engine design preferred by most marine engine manufacturers to meet government mandated exhaust emission standards. Oil stored in the crankcase of these engines is splashed onto the walls for piston and ring lubrication .

They are equipped with oil control rings to scrap excess oil off of the walls. Pistons are easily identified by a three piece oil control ring in the bottom ring position.

They almost always have a flat top or a dished top and never have needle bearings between the wrist pin and connecting rod (like two-stroke engines).

14370

P/N 14370 Standard size crossflow pistons size is 2.565 inch OEM 780-9229A7 $115.99

P/N 14380 .015 over size crossflow pistons. Size is 2.565 inch OEM 780-9229A10 $118.95

P/N 14390 .030 over size crossflow piston size is 2.565 inch $116.95

4 Cylinder

30 hp. Jet L
Keystone rings 1998 to 2002
USA. OC159200-OG589999

40 hp.
1990 to 1997
USA. OC159200 and up
BEL. 9570790 and up

45 hp.
1986 to 1989
USA.5531630 and up
AUS 8063985 and up
BEL. 9248006 and up
CDN. 7143688 and up

50 hp. (model 50 or 500)
L
1970 to 1985
USA. 2305151 and up
AUS. 2863739 and up
BEL. 9001581 and up

14790 Piston rings pin retainers

P/N 14790 Standard size loop-charged size is 2.993 inch or 76 mm OEM 705-850026T3 $176.95

P/N 14800 .015 oversize loop-charged size is 2.993 inch or 76 mm OEM 705-850026T3 $152.95

Loopcharged pistons
30-60 hp. 1994-2002

Mercury, Mariner and Force
These engines use 2.993 inch (76mm)

2 Cylinder
30 HP 1994-2002
30 Jet 1998-2002
40 hp. 1994-2002
40 hp. 1997-2002

2 Cylinder

30 hp. (644cc)
1994 to 2002
USA. OG053314 and up

30 hp. Jet
1998 to 2002
USA. OG590000 and up

40 hp. (644cc)
1994 to 2002
USA. 0G053314 and up

40 hp.
1997 to 2002
USA. 0G0531301 and up
BEL. 9973100 and up

50 hp.
1998 to 2002
USA. 0G0590000 and up
BEL. 9973100 and up

3 Cylinder

55 hp.
1998 to 2002
USA. 0G0590000 and up
BEL. 9973100 and up

60 hp.
1998 to 2002
USA. 0G0590000 and up
BEL. 9973100 and up

14010

Cross flow pistons for inline
2, 3, 4 & 6 with 35-150 HP. 1970-1990
Mercury Mariner Force
These engines use 2.875 inch Low dome pistons. Low dome kits can replace high dome kits and will not affect engines operation.

35 HP. 2 - 1984-1989
40 HP. 2 - 1972-1983
50 HP. 3 - 1984-1990
60 HP. 3 - 1984-1990
65 HP. 3 - 1973-1976
70 HP. 3 - 1977-1983
75 HP. L4 - 1984-1986
80 HP. L4 - 1978-1983
85 HP. L4 - 1973-1977
90 HP. L6 - 1978-1986
115 HP. L6 - 1984-1988
135 HP. L6 - 1970-1971
140 HP. L6 - 1978-1980
150 HP. L6 - 1973-1978

P/N 14010 standard size Low dome piston kit newer series engines with .650 deflector height OEM 774-9137A9 $92.95

P/N 14030 .015 over Low dome piston kit newer series engines with .650 inch deflector height OEM 774-9137A10 $137.95

P/N 14050 .030 over Low dome kit newer series engines with .650 deflector height OEM 774-9137A11 $112.95

2 cylinder

35 hp. 1984 to 1989
USA. 6445653 and up
BEL. 9384476 and up
CAN. 7209608 and up

40 hp. (40,402) 1972-1983
USA. 3336258 - 55556229
AUS. 8002335 - 8064749
BEL. 3339688 - 9251455
CAN. 3340783 - 7144762

40 hp. 2 cylinder 1972 to 1983
USA. 5556230 - 0G053313
AUS. 8064750 and up
BEL. 9251456 and up
CAN. 7144763 and up

3 cylinder

50 hp. 1998-2002
55 hp. 1998-2002
60 hp. 1998-2002

50 hp. 1984 to 1990
USA.6428681 - 0D000749
BEL. 9385111 - 9683054
CAN. 7208333 and up

60 hp. 1984 to 1990
USA. 6428681 - 0D000749
BEL. 9385911 - 9683054
CAN. 720833 and up

65 hp. (650)
1973 to 1976
USA. 3293184 - 4571651
AUS. 8006640 - 8042349
BEL. 9020074 - 9135824
CAN. 7013633 - 7087822

70 hp. 1977 to 1983
USA. 4571652 - 6428680
AUS. 8042350 and up
BEL. 9135825 - 9385910
CAN. 7087823 - 7208332

4 cylinder

75 hp. 1984 to 1986
USA. 6432901 and up
CAN. 7208573 and up

80 hp. (80, 800)
L4 1984 to 1986
USA. 4831999 - 6432900
AUS. 8050200 and up
BEL. 9177626 - 9393855
CAN. 7110998 - 7208572

85 hp. (850)
L4 1973 to 1977
USA. 3493913 - 4831998
AUS. 8005440 - 8050199
BEL. 9011604 - 9177625
CAN. 7010108 - 7110997

6 cylinder

90 hp. (90, 900)
L6 1978 to 1986
USA. 4845301 and up
AUS. 8071020 and up
CAN. 7111698 and up

115 hp. (1150)
L6 1984 to 1988
USA 2839019 - 3525440

115 hp. (115, 1150)
L6 1984 to 1988
USA. 3525441 - 5829463
AUS. 8008665 - 8071134
CAN. 7010763 - 7171252

115 hp.
L6 1984 to 1988
USA. 5829464 and up
AUS. 8071135 and up
CAN. 7171253 and up

125 hp. (1250)
2641955 - 3253111

135 hp. (1350)
1971
USA 2839369 - 3293233

140 hp. (1400)
1980
3293234 - 350805

140 hp. (140,1400)
L6 1978 to 1980
USA. 4865678 and up
AUS. 8052650 and up
CAN. 7112773 and up

150 hp. (1500)
L6 1973 to 1978
USA. 3502806 - 5327662
AUS. 8005615 - 8052649
CAN. 7010533 - 7112772

14070

P/N 14070 Standard size loopcharged size is 2.565 inch OEM 783-9613T1 $117.95

P/N 14080 .015 oversize loopcharged size is 2.565 inch OEM 783-9613T2 $125.95

P/N 14090 .030 oversize loop-charged size is 2.565 inch OEM 783-9613T3 $120.95

3 cylinder

50 hp. 1998 to 2002
USA. OD000750-OG589999
BEL. 9683055-9973099

55 hp. 1998 to 2002
USA. OD000750-OG589999
BEL. 9683055-9973099

60 hp. 1998 to 2002
USA. OD000750-OG589999
BEL. 9683055-9973099

65 hp. JET 1998 to 2002
USA. OD000750-OG589999
BEL. 9683055-9973099

24600 L3 piston 70-90-115 hp.

P/N 24600 Standard size is 2.565 inch OEM 700-879858T08 $146.95

P/N 24610 .015 oversize
2.565 inch OEM 700-896961A02
$152.95

P/N 24620 .030 oversize for 2.565 inch
OEM 896962A02
$152.95

Inline 3 cylinder Optimax DFI piston

Inline 3-Cylinder 75, 90, 115 hp. Inline 3 cylinder
Mercury, Mariner and Force
Engines use 3.630 inch or 92mm pistons
Piston come with pin, rings and retainers

75 hp. L3-Cylinder OT980000 and up
90 hp. L3-Cylinder OT801000 and up
115 hp. L3-Cylinder OT801000 and Up

P/N 24600 092mm Standard OEM 700-879858T08
P/N 24610 092mm +.015 OEM 700-896961A02
P/N 24620 092mm +.030 OEM 700-896962A02

Rings for 2.565 inch Optimax DFI pistons
Sold in set of two

P/N 24670 Standard OEM 39-827179A12
$46.95

P/N 24680 Oversize +.015 39-875252A12
$31.95

P/N 24690 Oversize +.030 39-875257A12
$27.97