Re: Mercedes 380 SL knocking
- From: Jens <jens@xxxxxxxxx>
- Date: Mon, 26 May 2008 13:23:57 -0700 (PDT)
On May 24, 8:25 am, "somecar...@xxxxxxxxx" <somecar...@xxxxxxxxx>
wrote:
If anyone knows, what could be the source?
I think it's the catalytic converter, but my friend thinks it's a
colapsed lifter.
The noise goes away when RPM is raised. Oil pressure is good even in
idle.
This is a 1983 380SL with some 140-150000 miles.
here's a link to listen to it.http://www.youtube.com/watch?v=eUscE2IaC_8
Thanks any and all opinions.
The knock is one per revolution and goes away when engine is
accellerated in speed. It comes again at a specific point near idle
when deaccellerating the engine speed.
A stuck lifter would to my opinion not go away at higher revolutions
that way... just the contrary, and the sound would not be that sharp.
It sound more like something with engine suspension or anything on or
near the engine (with some mass) being loose. At low rpm's the engines
displacecement due to vibration will be higher, and at higher rpm's
whatever is loose will not be able to follow the vibration.
I once had exactly same symptom. It turned out to be the shock
absorber for the belt tightener, which had lost its rubber bushing,
causing the bolt to knock at the perimeter of the shock absorber
fixing hole - only at low rpm's. The sound was difficult to locate,
and I too spend a lot of time looking for at stuck lifter.
So, look for something simple.
.
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