A few weeks ago I posted my suspicions re: the timing chain in my 300D. Both before and after I installed a new chain, the cam was running about 18 degrees (at the crank scale) late. This measurement happens to coincide with the length of one chain link.
While it was most likely that the chain had skipped, I was concerned that possibly the vibration damper/timing scale had sheared or had otherwise become inaccurate because of someone's previous wrenching. This afternoon I used my new (from ZDmak) timing "whistle", which is inserted into the spark/glow plug hole, to confirm the timing of #1 piston TDC. While helpful, the whistle obiously isn't very precise because there's decreased movement of air as the piston nears TDC. As a double-check, I also verified start of delivery on the injection pump. Both the whistle and the IP suggested that the timing scale was probably reading correctly, and that only the cam was off. I removed the cam sprocket and moved the chain by one tooth to advance the cam timing and voila, everything lines up perfectly now. TDC at the crankshaft is showing exactly TDC at the cam. And the verdict after a quick test drive: huge improvement. The idle is MUCH quieter, less smoke and more power. I wish I'd done this much earlier! D. _______________________________________ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
