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Old 11-19-2013, 11:13 AM
airfoill airfoill is offline
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Join Date: Aug 2000
Location: Houston, Texas
Posts: 325
Originally Posted by ah-kay View Post
I resurrected a 190D OM601 engine with low compression in cyl 1, also < 100psi, by doing the following.

1) removed head.
2) removed oil pan and pushed all pistons out from below.
3) honed cylinder 1, cleaned ring grooves, load of carbon, replaced rings.
4) It bought the compression back to > 300psi ( cold ).
5) The compression on the other 3 cyl are OK but I cleaned the ring grooves anyway.
6) Now the engine runs like a champ.

I am not sure how easy to do it with a OM616 but you may be in luck as it is cyl 1. It may be possible to push the cyl 1 piston out by removing the lower oil pan only.

Good luck.
ah kay,

Did you have any broken piston rings on your car when you took the pistons out?
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