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


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Old 08-24-2012
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Yanmar 2gm transmission noise

Sometimes when I reduce the throttle on my Yanmar 2gm to idling speed, while still in gear, and try to increase throttle again, I hear a "clickity clacking" sound ....almost as though gears were not fully meshing. Sometimes the sound goes away as I accelerate. Other times I shift into neutral and repeat the process, which seems to fix the problem. Seems to only happen in forward gear, and more noticeably, when the engine is warm.

I am Puzzled.....any thoughts?
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Old 08-27-2012
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Re: Yanmar 2gm transmission noise

Maybe?

1. Loose or damaged motor mount(s)

2. Lose flywheel or springs in drive plate

3. Lose or missing gearbox to motor bolts

4. Loose propeller shaft to transmission coupling

5. Worn or out of adjustment clutch mechanization, try an oil change

6. Shift cable out of adjustment preventing full engagement in forward, try it with the cable disconnected shifting to forward by hand

Let us know what you find

Paul T
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Old 08-27-2012
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Re: Yanmar 2gm transmission noise

Thanks,

Shaft to coupling is fine. I, too, suspect clutch linkage issue. I'll try the shifting by hand method to see if I get better gear engagement.
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Old 09-13-2012
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Re: Yanmar 2gm transmission noise

I had something similar with the 2GM20F on my previous boat - a "clunk clunk clunk" when attempting to shift into forward, usually some additional revs and re-shifting would get it to engage. The clutch cone was worn; first time I had it serviced the marina "lapped" the cone which fixed it - for one year. When the problem came back they did the same thing again which did NOT work, at its worst I cleared Canadian customs while motoring backwards because forward would not engage.

Finally I pulled the transmission myself and had it rebuilt elsewhere.

FYI the Yanmar cone-clutch transmission has to be locked in Reverse while sailing; if left in forward the boat's motion will tend to release the cone's engagement and wear it away.

Not necessarily so for the larger plate-type transmission (where I've read conflicting info but *think* I'm doing the right thing by shifting to forward while sailing).
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Old 01-26-2013
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Re: Yanmar 2gm transmission noise

Cruising this site on another issue, this thread about the 2GM tranny caught my eye as in May/2012 I changed oil in the engine and tranny to a new multigrade "synthetic" oil (which Yanmar sells under their brandname). Huge mistake. The tranny began to vibrate and skip at 1500 rpm. Bringing in the mechanic he scoped the engine rpm and the tranny rpm and saw the drop dramatically. Draining the tranny oil back to 30 grade standard oil ( 3times) has virtually reduced the slippage. His words were "this is a 30 year old engine, 30 year old technology - keep it simple and stay away from synthetics (which weren't used then and are not mentioned in the manual). This tranny needs friction. Hopefully no damage done. Now I will continue searching the threads for something I saw about the slow response of the starter when you hit the start button due to the wiring at the solenoid or starter being the wrong size.
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Old 01-28-2013
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Re: Yanmar 2gm transmission noise

Quote:
Originally Posted by salishsea View Post
Now I will continue searching the threads for something I saw about the slow response of the starter when you hit the start button due to the wiring at the solenoid or starter being the wrong size.
Your slow start could be due to bad connections between the push to start button and the start solenoid located on the starter. Some have added a relay at the start solenoid that would be energized by the push button. This would put less current through the push button (therefore less voltage drop and more voltage on the start solenoid) on starting and might "fix" you problem. I think the additional relay just adds another failure point. You could check the connections along the existing wiring or rewire with larger gauge wiring.
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