Page 454 - GLM_MasterCatalog_GCBOAH

Yamaha
GLM Products, Inc.

GLM’s Exclusive Marine Pistons Piston Ring Coatings Comparison

TOC
• Fully Machined Hypereutectic Pistons Did you know sometimes as much as 30% of
engine friction comes from the piston rings?
• Featuring a Hard Anodizing Coating on Top
Therefore, 2-ring pistons have less friction than
• Resisting Temperatures up to 1560°F 3-ring pistons.
• Hardness: HV280-400 To minimize piston ring friction
Manifolds-Merc.
in the engine you should:
• Pistons are T-6 Heat Treated
• Choose the right ring tension and coating
• GLM Pistons are 100% Cast
• If oversize, check that the bore size is correct
• Change the engine oil regulary
Casting Forging
Manifolds-OMC
Low expansion rate Greater Strength
Pros Lighter weight
Longer life, Lower costs
Less strength but Heavier weight
Cons compensated by High expansion rate
strong mold process Shorter life, Higher costs
Manifolds-Volvo
Verdict For Recreational & High Performance
General use Purposes
Ring Coating Scuff Resistance Wear Resistance
Plain Poor Low
Warning:
Good
GLM Products, Inc. will not cover the warranty for Plasma Moly Excellent Excellent
Average
Nitriding
Manifolds-Barr
non-authorized marine engine boring services.
Chrome Average Excellent
Pistons - Inline 48, 55, 75, 80, 85 & 90 HP Pistons - 115, 130, 150, 175, 200 & 225 HP
MerCruiser
(ø 81mm) V4 & V6 (ø 89mm w/ 23mm Wrist Pin)

Merc / Mar / For

24760 24700

Pistons come with rings, pin & retainer. Pistons come with rings, pin & retainer.
OMC / Volvo
Rings come 2 in a set. Rings come 2 in a set (1 Keystone & 1 Rectangle).
Pistons Pistons - Port Side
24760 OEM: 6H1-11631-03-95 Size: ø 81mm 24700 OEM: 68F-11642-01-85, Size: ø 89mm
24761 OEM: 6H1-11635-03-00 Size: ø 81mm + .25mm OEM: 64D-11642-02-90,
24762 OEM: 6H1-11636-03-00 Size: ø 81mm + .50mm OEM: 6R5-11642-11-93
Johnson / Evin
Rings 24720 OEM: 6R5-11645-11-00, Size: ø 89mm + .25mm
14300 OEM: 688-11603-A0-00 Size: ø 81mm 24740 OEM: 68F-11645-01-00
OEM: 6R5-11646-11-00, Size: ø 89mm + .50mm
14301 OEM: 688-11604-A0-00 Size: ø 81mm + .25mm OEM: 68F-11646-01-00
14302 OEM: 688-11605-A0-00 Size: ø 81mm + .50mm Pistons - Starboard Side
Yamaha
24710 OEM: 68F-11631-01-85, Size: ø 89mm
OEM: 64D-11631-02-90,
OEM: 6R5-11631-11-93
24730 OEM: 6R5-11635-11-00, Size: ø 89mm + .25mm
OEM: 68F-11635-01-00
24750 OEM: 6R5-11636-11-00, Size: ø 89mm + .50mm
Index / X-Ref.
OEM: 68F-11636-01-00
Rings
14303 OEM: 64D-11603-02-00 Size: ø 89mm
14304 OEM: 64D-11604-02-00 Size: ø 89mm + .25mm
14305 OEM: 64D-11605-02-00 Size: ø 89mm + .50mm
Warranty

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