Page 375 - GLM_MasterCatalog_GCBOAH

Johnson / Evinrude
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
• Featuring a Hard Anodizing Coating on Top comes from the piston rings? Therefore, 2-ring pistons have
• Resisting Temperatures up to 1560°F less friction than 3-ring pistons.
• Hardness: HV280-400 To minimize piston ring friction in the engine you should: Manifolds-Merc.
• 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
Low expansion rate Greater Strength Ring Coating Scuff Resistance Wear Resistance
Pros Lighter weight
Longer life, Lower costs Plain Poor Low Manifolds-OMC
Less strength but Heavier weight Plasma Moly Excellent Good
Cons compensated by High expansion rate Nitriding Average Excellent
strong mold process Shorter Life, Higher costs Chrome Average Excellent
Verdict For Recreational & High Performance Warning: GLM Products, Inc. will not cover the warranty for
General use Purposes
non-authorized marine engine boring services. Manifolds-Volvo
Pistons - 2-Cyl. Crossflow Pistons - 2-Cyl. Loopcharged
9.9 & 15 HP (1981-92) (ø2.1875”) 40-60 HP (1980-94) (ø3.1875”)
Manifolds-Barr

MerCruiser
24410 24110

Pistons come with rings, pin & retainer. Rings come 2 in a set. Pistons come with rings, pin & retainer. Rings come 2 in a set.
Pistons Pistons
24410 OEM: 5006670 Size: ø 2.1875” 24110 OEM: 5006655 Size: ø 3.1875”
24420 OEM: N/A Size: ø 2.1875” + .020 24112 OEM: N/A Size: ø 3.1875” + .020 Merc / Mar / For
24430 OEM: 5006662 Size: ø 2.1875” + .030 24130 OEM: 5006665 Size: ø 3.1875” + .030
Rings Rings
23710 OEM: 386279 Size: ø 2.1875” 24310 OEM: 391170 Size: ø 3.1875”
OMC / Volvo
23720 OEM: N/A Size: ø 2.1875” + .020 24320 OEM: N/A Size: ø 3.1875” + .020
23730 OEM: 386280 Size: ø 2.1875” + .030 24330 OEM: 391416 Size: ø 3.1875” + .030
Pistons - 2-Cyl. Crossflow Pistons - 3-Cyl. Loopcharged
20, 25, 30 & 35 HP (1981-94) (ø3.000”) 60, 65, 70 & 75 HP (1976-88) (ø3.000”)
Johnson / Evin

Yamaha

23910 24040
Pistons come with rings, pin & retainer. Rings come 2 in a set. Pistons come with rings, pin & retainer. Rings come 2 in a set.
Pistons Pistons
23910 OEM: 5006657 Size: ø 3.000” 24040 OEM: 5006751 Size: ø 3.000” Index / X-Ref.
23920 OEM: N/A Size: ø 3.000” + .020 24060 OEM: N/A Size: ø 3.000” + .020
23930 OEM: 5006664 Size: ø 3.000” + .030 24080 OEM: 5006666 Size: ø 3.000” + .030
Rings Rings
24240 OEM: 396377 Size: ø 3.000” 24240 OEM: 396377 Size: ø 3.000”
24260 OEM: N/A Size: ø 3.000” + .020 24260 OEM: N/A Size: ø 3.000” + .020 Warranty
24280 OEM: 396379 Size: ø 3.000” + .030 24280 OEM: 396379 Size: ø 3.000” + .030

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