Originally Posted by Stretch

I have checked several Mercedes engines and the position of the TDC pointers to make sure everything is OK. I've found that the pointers are pretty much bang on - may be a slight hair's breadth out - but they are good in the context of what they are meant to be used.

THATS REASSURING. THANKS

The "2mm lift" test is worth completing a few times to make sure you are getting consistent readings.

DID THAT FOR SURE.

Make sure your head is in the right position too! If you don't look straight down at the pointer then you might be able to get a variation in your reading.

ROGER THAT.

If you really want to check the pointer try and find TDC. I've used a version of the method in chapter 03-345 (dropping the valve on the piston crown) to find TDC before - make sure the piston is near the top of the cylinder though...

NAH! I'M GOOD

...as the offset keys - well I think they don't do what they are meant to do. I've played about with measurements and think that they adjust for slightly smaller values =>

I MAY TINKER WITH IT SOME MORE BUT FOR NOW IM JUST HAPPY ITS RUNNING. THROTTLE RESPONSE IS SLUGGISH... NEED TO RESEARCH THAT ONE.

http://www.peachparts.com/shopforum/diesel-discussion/290268-om617-non-turbo-cam-profile-specs-piston-height-specs-etc-2.html#post2642819

I might be wrong - see what you think. The acid test is to fit one of the keys and see if it does indeed make the difference it is meant to do - I've not done that. I opted to change the chain for a new one because the age of it was unknown.