Hmmm. I was under the impression that it was just wear in the rollers allowing the grooves in the gears to synch differently. I suppose it makes sense that the plates wear in the rollers also, causing elongation of the entire chain... silly me.

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

Roughly speaking it seems to me that if you have one degree of elongation (measured by the 2mm method blah blah blah) at the crank that is about 0.5mm of linear elongation.

I've stuck the calculations here =>

OM617 (non turbo) cam profile specs, piston height specs etc

You can also see that I think the 4 degree offset key solution provided by Mercedes isn't very good...

So there's some controversy for you all!

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1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!