Tony, >From my Yanmar Service Manual, Marine Diesel Engine, Model 3QM30(H), Chapter 1 >General, 2. Specifications:
Reduction gear system Reduction ratio: Model: 3QM30 3QM30H 3QM30Y 3QM30F Model YP-10M KH-18 YP-10M KH-18 Reduction Ratio: Ahead 2.20/3.21 2.31/3.00 2.20/3.21 2.31/3.00 Astern 2.30/3.46 1.96/3.06 2.30/3.46 1.96/3.06 The YP-10M Reduction gear system is a Constant-mesh spur gear, with a Mechanical wet type single disk clutch and the KH-18 Reduction gear system is a Constant-mesh helical gear, with a Mechanical wet type multi disk clutch. I have no idea what all of this means but I hope that this may help. Frank Noragon S/V: Cool Change C&C 38LF, s/n: 001 Rose City Yacht Club Portland, Oregon
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