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  #16  
Old 03-12-2010, 08:23 PM
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The source of this sound ended up being the serp tensioner arm. About half of the bearings had fallen out. The roller bearing wasn't too happy either. It looked like someone had been in there before, there was grease glomed all over the tensioner arm's bushing.

How long are people seeing these parts last? They were only supposed to have ~60,000 miles on them! EDIT: Hmm, I wonder if those parts would have been included with the crate motor? If they are original I could understand them being so worn out.

-J

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Last edited by compu_85; 03-12-2010 at 09:56 PM.
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  #17  
Old 03-13-2010, 11:54 AM
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Are you sure it's not one of the hydraulic lifters hanging up?

Edit: Nevermind, didn't see 2nd page follow-up.
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  #18  
Old 03-13-2010, 01:48 PM
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Chain tensioner gets an oil supply from the main oil gallery via drillings in cyl. head...

Have you recently replaced head-gasget??
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  #19  
Old 03-13-2010, 02:37 PM
compu_85's Avatar
Cruisin on Electric Ave.
 
Join Date: May 2008
Location: Springfield VA
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No resent head gasket work. As far as I know everything internal on this engine is original to it (It's a Mercedes crate motor from 1998). Overlooking the serp tensioner arm I replaced the serp tensioner damper, vacuum pump (twice), and the timing chain tensioner. Oh well, I guess now I won't need to touch those items for a while now.

I assumed the serp tensioner would have come with the new engine, but it seems not. The sound this made was nothing like a ticking lifter. It was much louder, and irregular. The sound also went away when you reved much over idle. I'm glad it's finally fixed

-J

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1991 350SDL. 230,000 miles (new motor @ 150,000).

Tesla Model 3. 136,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.
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