Page 376 - GLM_MasterCatalog_GCBOAH

Johnson / Evinrude
GLM Products, Inc.

The Four Basic Piston Designs used in Mercury / Mariner / Force engines are:
TOC
DFI Crossflow Loopcharged Four-Stroke
Piston with Dome Top Piston with Flat Top & Oil-ring
and Splash Well Piston with Deflector Top Piston with Flat Top in the Bottom Position

Manifolds-Merc.

Manifolds-OMC
Standard Removeable Non-Removeable 3 Rings w/ Oil Control Ring
Ring Set Transfer Port Cover Transfer Port Cover in Bottom Position
Pistons - 3-Cyl. Loopcharged Difference in Engine Designs
60, 65, 70 & 75 HP (1986-94) (ø3.1875”) Johnson / Evinrude V4 & V6
Manifolds-Volvo
Theses pistons come with Keystone (triangular) rings 60° vs. 90°
Johnson / Evinrude outboards were the first to break away
from the inline cylinder engine concept. In 1958 they introduced
a V4 outboard to the marine industry. This outboard had the
Manifolds-Barr
cylinder walls configured into a 90 degree V shape. In 1976 two
more cylinders were added and the 90 degree V6 was born. As
casting techniques improved a more compact 60 degree V6
engine was introduced in 1991 followed by the 60 degree V4 in
23770
1995. Other than a narrower profile the difference between an
older 90 degree engine and a newer 60 degree engine is the
MerCruiser
Pistons come with rings, pin & retainer. Rings come 2 in a set. location of the carburetors/throttle bodies. A 90 degree V4/V6
Pistons engine will have the carburetors/throttle bodies located in the
23770 OEM: 5006701 Size: ø 3.1875” front of the crankcase directly over the crankshaft. A 60 degree
23780 OEM: N/A Size: ø 3.1875” + .020 V4/V6 engine will have the carburetors/throttle bodies located
on the side of the crankcase, directly over the transfer ports.
23790 OEM: 5006702 Size: ø 3.1875” + .030
Rings 90° V4/V6
Merc / Mar / For
24310 OEM: 391170 Size: ø 3.1875”
24320 OEM: N/A Size: ø 3.1875” + .020
24330 OEM: 391416 Size: ø 3.1875” + .030
Pistons - 3-Cyl. Loopcharged
OMC / Volvo
60, 65 & 70 HP (1994-01) (ø3.1875”)
Theses pistons come with traditional (rectangular) rings

Johnson / Evin

60° V4/V6
23740
Yamaha
Pistons come with rings, pin & retainer. Rings come 2 in a set.
Pistons
23740 OEM: 5006694 Size: ø 3.1875”
23750 OEM: 5006707 Size: ø 3.1875” + .020
Index / X-Ref.
23760 OEM: 5006695 Size: ø 3.1875” + .030
Rings
24540 OEM: 436972 Size: ø 3.1875”
24550 OEM: N/A Size: ø 3.1875” + .020
24560 OEM: 436973 Size: ø 3.1875” + .030
Warranty

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