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Old 04-24-2010, 08:04 PM
sixto's Avatar
smoke gets in your eyes
Join Date: Jun 2000
Location: SF Bay Area
Posts: 20,793
A replacement MB block or engine won't have a number by the IP. It should have a tag at the aft end of the block on the turbo side below the block heater. IIRC the 7th and 8th digits tell you if it was a replacement short block (no head), long block or complete engine. Here's a sample tag from gsxr's collection:

I don't know how Metric and other rebuilders identify reworked 603s.

If you don't mind the work of replacing the engine, don't dismiss an iffy 3.5. You can swap in a 3.0 block for little more than the cost of a good short block and a head gasket. Under $1000 bare bones to $2500 if you succumb to while you're in there's. Don't make a decision without pulling the head to measure piston protrusion to confirm bent rods. A bad head gasket oil seal will cause symptoms of a bent #1 rod.

87 300D
Attached Thumbnails
OM603 engine block number LOCATION-603_970d.jpg   OM603 engine block number LOCATION-603_970h.jpg   OM603 engine block number LOCATION-603_970j_tag.jpg  

Last edited by whunter; 07-26-2010 at 03:04 PM. Reason: attached pictures
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