Noise from engine 617.952 - Page 2 - PeachParts Mercedes-Benz Forum

Gordo · #16 10-30-2007, 12:49 AM

Quote:

Originally Posted by t walgamuth

I suspect worn cam chain tensioner or vac pump. If it is the vac pump you don't want to tarry in fixing it. It can trash the engine if it comes apart and parts fall into the chain and break it.

The cam chain tensioner is nothing to fool with either.

Tom W

I am afraid you might be right. I think it is something to do with the timming chain b/c I noticed that the noise went away (for a short time... 2-5 min.) with fresh oil in a warm motor that would otherwise be noisy. I think that the cool and more viscous oil helps. Kinda sounds like the front of the motor too. I took off the valve cover and it all looked normal. I could not find any metal in my old oil, even with a magnet so I gess that is good. What do you think of running heavier oil? Perhaps 20w50? I have always used conventional 15w40 (summer) and 10w40 (winter).

Gordo · #17 07-23-2008, 12:01 AM

I am writing to give words of warning to other 617 drivers. The sound that I was hearing was the chain that drives the oil pump. I found it a couple of weeks ago when it broke and destroyed my motor.

After checking all of the things discussed above to no avail I went on driving. About 10000 miles after my original post the oil pressure gauge started to bounce. I thought that the oil line from the back of the filter might be leaking so I stopped to look. No leak. I was far from home and I continued to drive. I drove several miles before the pressure gauge started to bounce again. Before I could pull over I had lost all oil pressure. I shot the engine off, but not in time.

When I took the oil pan off the oil pump chain was hanging in pieces from the oil pump drive gear. There where several metal bits in the oil pan too.

Learn from my mistake. Find the noise. A bouncing oil pressure gauge is a sign of a failing oil pump.

jt20 · #18 07-23-2008, 12:24 AM

did you save your engine?

Gordo · #19 07-23-2008, 12:36 AM

Nope. The engine was re-buildable but I just put a used engine in it. I kept the wagon head with the SLS pump. (If anybody needs one let me know.) The block was not that bad. The pistons where not scored. The front main bearing got involved with the oil pump chain and it is trashed.