Hello group.. We have a 1987 300SDL, that just turned over 250K over the holiday weekend..As far as I know, the engine has never had major overhaul but when we bought it our mechanic said it looked like the timing chain tensioner was new as it had this shiny knob thing sticking out on the pass side of the front of the engine..The car runs flawlessly and uses very little oil but this weekend we went to north Texas and it was a bit chilly (28 degreesF) and both mornings, we started the car and it fired right up and ran good..But within about 45 seconds the engine started making a noise I can best describe as what an AC compressor sounds like when it's going out..Sorta made a grumbling, rattling sound..I raised the hood and it sounded like it was coming from the valvetrain area..Soon it stopped and didn't reappear till the next morning..But now we are home and it's not that cold it didn't do it..Could the timing chain tensioner be hanging up or something? I have a note into my mechanic but I think he is still out of town... Thanks in advance!!! John
- posted
20 years ago