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Old 02-08-2005, 01:37 PM
joebiodiesel joebiodiesel is offline
Registered User
Join Date: Apr 2004
Location: Central NY USA
Posts: 32

I took the valve cover off and ran the engine. There is no change if I put pressure on the followers with a screwdriver as it's running, so it doesn't act like a valve clearance problem. There is a tensioner/slider on the back side of the chain (I'm sure many of you know that), If I put pressure on that slider, moving it tighter to the chain i feel a bump in it that corresponds to the tapping noise. Also as soon as I shut it off, there is slop in that slider. Should that thing hold tensioning pressure after the engine is off? It doesn't appear sloppy with ther engine indling. Lastly, now that I've fooled around in there, the noise is gone except when I throttle the engine, which you can only do with the valve cover back on.
1978 300SD
Running Biodiesel/SVO, 2 tank system
127,000 Miles
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