GLM

Piston Kit (ø 2.565 +.030)

All pistons come with rings, pin and retainers.

GLM’S EXCLUSIVE MARINE PISTONS
• Fully Machined Hypereutectic Pistons
• Featuring a Hard Anodizing Coating on Top
• Resisting Temperatures up to 1560°F
• Hardness: HV280-400
• Pistons are T-6 Heat Treated

Crossflow: The oldest design, and the one used on Mercury / Mariner /Force 35-150 HP engines from 1970-1990 is the crossflow piston. As 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. All 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.

Piston Kit (ø 3.500 +.015) replaces Mercury/Mariner/Force part # 2704-821896A3

Loopcharged Pistons for Inline 3 & 4-Cylinder 65-115 HP (1994-2000)
Mercury / Mariner / Force
These engines use ø 3.500” Pistons

Piston Kit (ø 3.500 +.030) replaces Mercury/Mariner/Force part # 2704-821896A4

Loopcharged Pistons for Inline 3 & 4-Cylinder 65-115 HP (1994-2000)
Mercury / Mariner / Force
These engines use ø 3.500” Pistons

Piston Kit (ø 3.500) replaces MerCruiser part # 2704-826191T4

Loopcharged Pistons for Inline 3 & 4-Cylinder 65-115 HP (1994-2000)
Mercury / Mariner / Force
These engines use ø 3.500” Pistons

Piston Kit (ø 2.993 +.015) replaces MerCruiser part # 705-850026T2

All pistons come with rings, pin and retainers.

GLM’S EXCLUSIVE MARINE PISTONS
• Fully Machined Hypereutectic Pistons
• Featuring a Hard Anodizing Coating on Top
• Resisting Temperatures up to 1560°F
• Hardness: HV280-400
• Pistons are T-6 Heat Treated

Loopcharged: In 1976 Mercury / Mariner /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 piston deflector. All 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.

Piston Kit (ø 2.993) replaces MerCruiser part # 705-850026T3

All pistons come with rings, pin and retainers.

GLM’S EXCLUSIVE MARINE PISTONS
• Fully Machined Hypereutectic Pistons
• Featuring a Hard Anodizing Coating on Top
• Resisting Temperatures up to 1560°F
• Hardness: HV280-400
• Pistons are T-6 Heat Treated

Loopcharged: In 1976 Mercury / Mariner /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 piston deflector. All 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.

Piston STBD Kit w/ Iron Rings (ø 3.375) replaces Mercury/Mariner/Force part # 766-8666T41

Loopcharged Pistons for V6 XR4, MAG II, V-175 - V225 (1978-1990)
Mercury / Mariner / Force
These engines use ø 3.375” pistons

Piston Kit w/ Iron Ring (ø 3.375) replaces Mercury/Mariner/Force part # 766-8667T41

Loopcharged Pistons for V6 XR4, MAG II, V-175 - V225 (1978-1990)
Mercury / Mariner / Force
These engines use ø 3.375” pistons

Piston Kit (ø 2.875 +.015) replaces MerCruiser part # 774-9137A10, 774-9137A13

Crossflow Pistons for Inline 2, 3, 4 & 6-Cylinder 35-150 HP (1970-1990)
Mercury / Mariner / ForceThese engines use ø 2.875” Low Dome Pistons

Piston Kit (ø 2.875 +.030) replaces MerCruiser part # 774-9137A11, 774-9137A14

Crossflow Pistons for Inline 2, 3, 4 & 6-Cylinder 35-150 HP (1970-1990)
Mercury / Mariner / ForceThese engines use ø 2.875” Low Dome Pistons

Piston Kit (ø 3.375 +.015) replaces Mercury/Mariner/Force part # 777-815965A5

Loopcharged Pistons for Inline 3 & 4-Cylinder 70-115 HP (1987-1993)
Mercury / Mariner / Force
These engines use ø 3.375” Pistons with Rod No. 646-818846