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Old 05-06-2011, 01:06 AM
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Join Date: May 2009
Location: sw okla.
Posts: 51
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?

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Old 05-06-2011, 04:05 PM
compress ignite's Avatar
Drone aspiring to Serfdom
Join Date: Feb 2004
Location: 32(degrees) North by 81(degrees) West
Posts: 5,554
GSXR's OM603 Head R+R

All Photos courtesy GSXR:

You will not enjoy this task (Or Success) WITHOUT the Factory Service Manual for YOUR engine!
'84 300SD sold
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Old 05-07-2011, 04:10 PM
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Join Date: Jan 2006
Location: Northeast Indiana
Posts: 10,767
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.

Gone to the dark side

- Jeff
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Old 05-07-2011, 07:48 PM
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smoke gets in your eyes
Join Date: Jun 2000
Location: SF Bay Area
Posts: 20,806
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.

87 300D

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