Yanmar tranny clunks on engagement - SailNet Community

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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
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Diesel This is a forum dedicated to diesel engines and their applicable accessories.


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Old 03-22-2010
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Yanmar tranny clunks on engagement

Hello,

I have just repowered my motorsailer with a new Yanmar 4jh4ae 54hp engine. The engine is mated with a Kanzaki KM35A2 marine gear. I did the install myself but a Yanmar mechanic was on hand for the first start up. The day went pretty much flawlessly, but i did notice that the engine clunks into gear pretty hard. I was wondering if anyone has the same transmission or similar and experiences the same issue. The mechanic says it is pretty much normal for a marine gear with a cone clutch and we set the idle down a bit so it wasn't hitting so hard. Please weigh in with any personal experiences.


Thanks,

Jarod.

Last edited by jarod; 03-25-2010 at 09:59 PM.
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Old 03-22-2010
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I'm not sharing any personal experiences about a tranny named Yan who clunked on our engagement. I'm not even sure how you found out about her, or him, or whatever........

Oh wait I miss read that.

Yes I have lowered the idle setting to reduce a hard engagement but at the same time I have known other, non-marine, engines to live a long life with such a issue. It seems to me that in many cases it is just loud to us, not abusive to the gears but mileage may vary.
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Old 03-22-2010
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Yup. That's about the funniest reply ever

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Old 03-25-2010
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Old 03-26-2010
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I don't know much about inboards. However, if this were happening on a rear wheel drive car it would be time for new u-joints. The concept is similar except the drive shaft on your boat connects to the prop instead of the rear axle on a car. U-joints connect spinning shafts that don't line up (rotate on the same axis). Look at the joints connecting the tranny to the drive shaft. If there is play, the bearings are worn.
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Old 03-28-2010
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Don't worry about it, Volvo-Penta uses cone clutches in all of their outdrives, and they last for ever. Cone clutches engage with a notable CLUNK, does not hurt anything. Provided engagement is not made above an idle. The prop shaft will absorb any energy, same as other types of transmissions. I have had many types of transmissions that had a clunk when engaging that lived long happy lives.
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