Quote:
Originally Posted by Ferdman
ytech15, some of the noise on cold start is the air pump. The engine sounds "normal" most of the time, but the loud bursts sound threatening. With a bad timing chain tensioner, likely the result of a broken internal spring that fails to keep the timing chain tight at start-up, you will hear the timing chain slap until oil pressure builds up inside the tensioner. Best to have a MB-trained tech familiar with that vintage engine diagnose the problem before your engine suffers potentially serious damage. I had the timing chain tensioner replaced in the M104 engine in our 1992 300CE around 100,000 miles. I always run Mobil 1 15W50 in our vehicles with that vintage engine (1995 and earlier).
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Thanks for your input.
I'm planning to replace the drive belt tensioner, shock and adjustment road soon, It does not seem too hard to replace the timing chain tensioner while doing this job BUT I'm afraid that the chain will jump a link with no tension (while the tensioner is out, 99K Miles. didn't take the valve cover off so condition of chain is unknown.. ) .. what were the symptoms that made you replace your tensioner?
also, are there any kind of oil additives that can actually help revive the lifters?