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Old 05-06-2011, 01:06 AM
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Join Date: May 2009
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Head gasket '93 603.....

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

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Old 05-06-2011, 04:05 PM
compress ignite's Avatar
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Join Date: Feb 2004
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GSXR's OM603 Head R+R

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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Old 05-07-2011, 04:10 PM
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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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Old 05-07-2011, 07:48 PM
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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

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