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post #1 of 48 Old 04-03-2014 Thread Starter
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Yanmar super vibration

MY YANMAR 3YM30 IS SHAKING ITSELF TO BITS. It is 9 years old and 3000 hours and has run perfectly until 30 hours ago. The engine runs perfectly in neutral to full RPM. It also runs smoothly in reverse at all speeds. In forward gear, it runs ok until I shift into neutral and try to shift back into forward.

Then the engine starts to shake at 1000rpm and shakes horribly and starts a clacking / grinding noise at anything over 1200 rpm. It is truly frightening

On the advice of the Singapore dealer, I replaced the engine mounts and vibration damper. No improvement at all.

Finding an available mechanic here is very difficult, so any suggestions what to look into would be most appreciated.
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post #2 of 48 Old 04-03-2014
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Re: Yanmar super vibration

Better have a look at the running gear.
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post #3 of 48 Old 04-03-2014
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Re: Yanmar super vibration

Cutlass bearing?
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post #4 of 48 Old 04-03-2014
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Re: Yanmar super vibration

Bent shaft.

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post #5 of 48 Old 04-03-2014
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Re: Yanmar super vibration

If you go back into neutral and into forward again, does the problem go away? If not, if you back and forth a few times does it go away? Sounds like something isn't engaging in the gearbox (or transmission if you want to be all American about it). Could be something as simple as a cable adjustment needed, make sure when you are in gear that the shift lever on the gearbox is fully engaged.

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post #6 of 48 Old 04-04-2014
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Re: Yanmar super vibration

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Originally Posted by meanderboy View Post
MY YANMAR 3YM30 IS SHAKING ITSELF TO BITS. It is 9 years old and 3000 hours and has run perfectly until 30 hours ago. The engine runs perfectly in neutral to full RPM. It also runs smoothly in reverse at all speeds. In forward gear, it runs ok until I shift into neutral and try to shift back into forward.
Then the engine starts to shake at 1000rpm and shakes horribly and starts a clacking / grinding noise at anything over 1200 rpm. It is truly frightening
On the advice of the Singapore dealer, I replaced the engine mounts and vibration damper. No improvement at all.
Finding an available mechanic here is very difficult, so any suggestions what to look into would be most appreciated.
What is a vibration damper? Where is it mounted?
I suppose you're based in Singapore? You could dismantle the gearbox and bring it to CLLS for them to service or contact Bobby Ee from Esgrit for some help/repair.

Ken
2002 Hunter 326, SV Millennium 2
1999 Macgregor 26X, SV Millennium
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post #7 of 48 Old 04-04-2014
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Re: Yanmar super vibration

Have you actually checked your propeller? What you are describing is a classic symptom with a worn folding or feathering propeller or a bent blade on a fixed propeller.

Stanley,
Marine Diesel Engine Vendor
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Re: Yanmar super vibration

just replaced cutlass 2 months ago. no play at all now.

Last edited by meanderboy; 04-04-2014 at 10:16 AM. Reason: incomplete
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post #9 of 48 Old 04-04-2014 Thread Starter
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Re: Yanmar super vibration

23 inch shaft is good on dial guage
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post #10 of 48 Old 04-04-2014
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Re: Yanmar super vibration

I'm leaning towards a folding prop that's failing to fully open in forward at times.

On a former boat we got into the habit of spinning briefly in reverse before going forward - usually dealt with it.
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Ron

1984 Fast/Nicholson 345 "FastForward"

".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)

Last edited by Faster; 04-04-2014 at 10:25 AM.
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