The oil pump chain snapped while it was doing 75+mph on the freeway. The engine is now a door stop. I will get to it but do not know when. I hope your engine is not damaged when it is starved of oil.

If I read all the posts correctly, I think the oil pan needs to come off to replace the chain. You also need a chain crimper to crimp the master link.

Good luck.

__________________
Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed.

W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html

1 X 2006 CDI
1 x 87 300SDL
1 x 87 300D
1 x 87 300TDT wagon
1 x 83 300D
1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry.

You have to remove the hole oil pan, not just the sump. Which is a real pita. But the fun is only beginning!

Then you have to remove the chain tensioner. (The oil pump chain tensioner. You will see it up under there when you get the whole oil pan off.

THen you have to remove the sprocket with some screwdrivers.


Then I think it's just a couple of long bolts holding it on.

I have to say I'd rather have a root canal than have to remove the lower oil pan with the engine in the car!

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1978 Mercedes 240D
1981 Mercedes 240D
1982 Mercedes 240D

This is what I posted when the oil chain snapped in July 2012. I am happy to report that the car is running again. The engine seized and the picture showed what happened to the rod bearings. Metal shavings everywhere. I knew it would run again one day and now it is a reality. I opened up the engine and found minimal damage. The 3 rod bearings are kaputt, shown here. The other 3 set are relatively unscathed. Cylinder 1 and #1 crank rod journal was badly scarred but the rest is relatively OK. This is what I do to bring the engine back from the brink. It was all done with block in engine.

1) Replace all rod and main bearings. I got them from JY.
2) Replace all piston rings but with new oil control rings. Again from JY.
3) Honed cylinder 1 as it was scarred bad. Replace #1 piston. The other cylinders were lightly honed.
4) Polished the crank rod journals. Rod journal #1 was scarred bad and was oval-ished. I shim it by 1/1000" when I bolted the rod back on.
5) All cylinder have compression over 300psi when cold.
6) New oil chain and re-crimp. it is easy to replace once the oil pan is removed.
7) Buttoned everything together and it started right up and running smooth but smoked a lot.
8) Turbo was probably damaged when it lacked oil so I replaced it. The smoking is gone.

I learned a lot in the process. It was fun but VERY time consuming. I did it slowly and in between my other commitments so it is OK. The motto is never give up on an engine as the OM603 is very robust, probably same for the OM617. Did 150 miles so far and counting but the jury is still out so to speak. However, I have no reason to doubt the fix.

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__________________
Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed.

W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html

1 X 2006 CDI
1 x 87 300SDL
1 x 87 300D
1 x 87 300TDT wagon
1 x 83 300D
1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry.