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  #1  
Old 05-04-2012
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pinging diesel motor

Just looked at an old boat (1982), the motor pings. The ping goes away at higher RPM's, but once it's under about half to two-thirds throttle it pings loudly.

Is this motor probably shot?
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Old 05-04-2012
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Re: pinging diesel motor

piston slap? Did it start easy? Was it warm when you got there as if the owner had warmed it up? Notice the color of the exhaust?
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Re: pinging diesel motor

It did not start easy.

I am not sure whether it had been warmed up or not, but the motor wasn't hot when I looked at it. I didn't touch it so I don't know if it was a little warm, but it was def not hot.

Color was a light grey smoke, a considerable amount when it first started but not that much once it started.
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Re: pinging diesel motor

Under load or not ?
Engine hot or cold ?
What engine ?
Need a much better description of "pinging" sound.
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Re: pinging diesel motor

Not under load. Engine probably cold, but ran it for a few minutes and the pinging remained. I took a video of the pinging, I will post a link to it when I get home. From all these questions I am assuming it is not necessarily a dead motor just because it's pinging, my father thought the crankshaft might be hitting the crankcase causing the pinging but neither of us have much experience with diesels...
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Re: pinging diesel motor

If the crank was hitting the case it would have to be broken, if it is and you rev it high enough the crank will come through the case ..... don't get your face too close

Still need to know what engine ?
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Re: pinging diesel motor

1982 Yanmar 2 cylinder 15 hp
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Re: pinging diesel motor

I expect its not a good sign,it could be caused by a worn rod bearing or piston-connecting rod [wrist] pin resulting in piston slap,at any rate I would be very leery
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Re: pinging diesel motor

I have heard some diesels with a "pinging" sound when cold but as they warmed up the "pinging" went away. The timing may be off? bad injectors? piston slap? Suggest you have a mechanic listen to it.

Paul T
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Re: pinging diesel motor

The cheapest, fastest, simplest thing to try first is to loosen one of the injector nuts so that cylinder is not firing. Rev up the engine and listen for ping. If the ping is still there tighten that injector and loosen the otherer one and try again.

If this makes the ping go away all you need is an injector rebuild at about $85.00 each.
Have lots of paper towel for diesel spray from the loosened injector.
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