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#1
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noise coming from under valve cover, need help diagnosing...
Guys,
*EDIT* I have updated the description with more details. On the '85 there is a rhythmic sort of chugging sound at around 1200-1800 rpm under load. almost sounds like an exhaust leak, but I don't think it is. The noise has been there for the past 700 miles, and was there when purchased. decided to let it go at first and run a few tanks of new fuel (car had sat for two years) through before coming to any conclusions. the noise: - is not present at idle (normal diesel clatter) - appears at 1200-1800 rpm, especially under load - also appears at same RPM's while pressing down brake and accelerator simultaneously to load down without moving, or when just when revving in neutral - seems about 1/5 of RPM speed - is not loud enough to hear over the blower on high - sound goes away above 2000rpm, runs great on highway the noise is coming from under the mercedes symbol on the valve cover. what could it be? what can i check when i take the valve cover off? what could be loose? Thanks, dd
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------------------------------- '85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit) '82 300D, 'Tex', 228k body / 170k engine ... summer car '83 300TD Cali Wagon 210k, wife's car Last edited by dieseldan44; 01-18-2009 at 12:30 AM. |
#2
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Make sure manifold bolts are tight,they can get loose.Also if been that way a long time,gasket job may be needed.EGR can stick and leak I've heard.
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1999 w140, quit voting to old, and to old to fight, a god damned veteran |
#3
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Quote:
EGR seems like a possibility, i like that...but would it be rhythmic? ill check the manifold bolts. thanks for ideas. i need to get away from thinking bad thoughts, like rods and bearings and internals
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------------------------------- '85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit) '82 300D, 'Tex', 228k body / 170k engine ... summer car '83 300TD Cali Wagon 210k, wife's car |
#4
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updated the first post with more description...
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------------------------------- '85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit) '82 300D, 'Tex', 228k body / 170k engine ... summer car '83 300TD Cali Wagon 210k, wife's car |
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