Spraybomb Rattle Sound at front or OM352 - Mercedes-Benz Forum
 
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post #1 of 6 (permalink) Old 02-11-2019, 06:37 PM Thread Starter
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Spraybomb Rattle Sound at front or OM352

I have a 1976 406 with an OM352 with almost 8000 hours. I am hearing a noise, that is best described as a rattle, that sounds like a spraybomb (spray paint can) marble as you shake the can in preparation to paint. It is not consistent/rhythmical, kind of random (not rpm specific). It seems to be worse on warmup (it has been a very cold winter here with temps around -35C overnight). I use my Unimog to plow snow etc. I put a new water pump in it less than a thousand hours previous. My suspicions are the hydraulic pump or the power steering pump. It seems to quieten down as things warm up to operating temperature. I guess another suspect could be the cam chain or even the oil pump attempting to pump jello (-35). Does anyone have any experience or ideas that may help?

The sound is definitely a hard metal sound, like a spraybomb being shaken, glass marble against sheet metal, coming from the front of the engine.

Thanks,

Arlen
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post #2 of 6 (permalink) Old 04-01-2019, 02:02 PM
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Hi there, I have similar problem om352 engine - perfect description of the rattle, not uniform at all, initially thought some rock had shot up into fan, but no....
Did you work out what the issue was?
I’m thinking more oil pump here.

Hope to hear you got sorted, cheers!
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post #3 of 6 (permalink) Old 04-25-2019, 12:54 AM
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RESOLVED:

In the hope of helping someone somewhere... the noise described, in my case, was caused by timing gear bolts backing out and getting chopped up and bouncing about hitting timing cover.
Lost 3 of 4 - caught problem in time.

Whoop whoop!
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post #4 of 6 (permalink) Old 04-25-2019, 11:07 AM
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It's good that you tracked it down, and even better that you shared the solution to help others.
I bet you don't miss the sound at all.
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post #5 of 6 (permalink) Old 04-25-2019, 11:35 AM
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Ha! No sir, don’t miss it at all.
Not even a little bit.

Hoping to eliminate the crazy engine imps playing the maracas from my dreams too
(at the least I am able to sleep again!).
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post #6 of 6 (permalink) Old 04-25-2019, 07:49 PM
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well done ! Catching these kind of issues in time can be problematic.

Life is like a sewer. What you get out of it, depends on what you put into it! - Tom Lehrer
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