Been noticing a little oil in the cooling system on my '93 300SD.I know about the rod bender thing and have been half heartedly looking for a replacement. The car is not running hot or overheating,though it was loosing a little coolant,found a leak at the duovalve and fixed that.I noticed that the hoses are extremely hard after 30-45 min in town driving.I can remove the cap after it sits overnight and there is still pressure in the tank.I'm thinking about changing the head gasket,but I've never done a diesel,plenty of gas though.Is it a royal pain to do,it does look much worse than most other OHC 6cyl.Is there anything that I should look out for besides the normal,(cracked,warped,bad seats,etc),any tricks you can share?
Thanks

All Photos courtesy GSXR:

http://www.w124performance.com/images/OM603_head_replacement/

Disclaimer:
You will not enjoy this task (Or Success) WITHOUT the Factory Service Manual for YOUR engine!

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'84 300SD sold
124.128

It is quite possibly a head gasket, which many theories link to hydrolocking and bent rods ($$thousands) eventually, I suggest repairing it and not driving it until it is repaired.

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Gone to the dark side

- Jeff

It has twice as many head bolts as an OHC gasser inline 6, but it's not more difficult than replacing the rear head gasket of a transverse V6 in a minivan.

Sixto
87 300D