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A bit off topic. My diesel sounds like death... help

Posted by Gravity Fed 
Gravity Fed
Alex Staidle
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A bit off topic. My diesel sounds like death... help
August 18, 2015 11:25PM
So this is my 1987 mercedes turbo diesel, om603 is the engine code. Car started making the noises only after freeway drives, but now its all the time. I changed the lifters, no change in noise. Cracked each injector, idle drops, but no change in noise. Thoughts?







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Edited 1 time(s). Last edit at 08/18/2015 11:26PM by Gravity Fed.
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Clayto
Clayton McCrary
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Re: A bit off topic. My diesel sounds like death... help
August 19, 2015 03:49PM
Nice turbo!!
Injector pump sounds a little tikky.....the deeper noise sounds like cummins diesel.
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Steve Wheeler
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Re: A bit off topic. My diesel sounds like death... help
August 19, 2015 06:12PM
Waterpump or other driven accessory bearing, something spinning way faster than the motor. Starter be six possibly not disengaging.



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Gravity Fed
Alex Staidle
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Re: A bit off topic. My diesel sounds like death... help
August 21, 2015 12:12PM
Replaced the belt tensioner and damper, intake manifold gasket, and glow plugs. Starts nicer but sounds worse somehow.



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Re: A bit off topic. My diesel sounds like death... help
August 25, 2015 09:24PM
Definitely one of the accessories, plain to hear that it's faster than crank speed so not in the engine. New tensioner is a bit stronger pulling a little harder on whatever is piling up. Water pump, idler, alternator.



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Gravity Fed
Alex Staidle
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Re: A bit off topic. My diesel sounds like death... help
August 25, 2015 11:35PM




Here is a better video.



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Re: A bit off topic. My diesel sounds like death... help
August 26, 2015 08:43AM
Wheres your narration?








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ElectroTech
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Re: A bit off topic. My diesel sounds like death... help
August 26, 2015 01:25PM
Yeah you never really said what noise in particular. I hear what sounds like a giant exhaust leak, normal injection noise and what sounds like an accessory noise since its faster than the engine speed. If you don't have a noisy exhaust maybe you have a stuck intake valve and its blowing back into the intake.



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Robert Culbertson
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Re: A bit off topic. My diesel sounds like death... help
August 26, 2015 02:09PM
Quote
ElectroTech
Yeah you never really said what noise in particular. I hear what sounds like a giant exhaust leak, normal injection noise and what sounds like an accessory noise since its faster than the engine speed. If you don't have a noisy exhaust maybe you have a stuck
intake valve and its blowing back into the intake.

A friend had an intake lifter pump up enough that it would not bleed down on a rebuilt engine. Verified which cylinder it was by running the engine without the intake manifold on and seeing which one spit back out the port. That was pretty neat to watch!
As far as the noise in the videos, sounds like an exhaust leak. That's all I got.
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Gravity Fed
Alex Staidle
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Re: A bit off topic. My diesel sounds like death... help
August 28, 2015 10:42AM
Next time ill use my best Morgan Freeman to narrate. That said i believe it to be the number 2 injector. I cracked it wide open and the noise stopped.



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Robert Culbertson
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Re: A bit off topic. My diesel sounds like death... help
August 28, 2015 11:40AM
Quote
Gravity Fed
Next time ill use my best Morgan Freeman to narrate. That said i believe it to be the number 2 injector. I cracked it wide open and the noise stopped.
Obnoxious loud noise goes away when you remove the fuel? I would do a quick compression check on that hole. If it's clanking and clattering, you might have other issues.
Pop testing the injector will at least let you know if the injector is firing too early or dribbling fuel.
I have a ghetto diesel injector test rig. You can send the injector my way if you can't find anyone down there to do it cheap.
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