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Not sure on a diesel, but I've seen cars with a small head gasket leak between the cylinders where the result was lowered compression due to pressure going back and forth between 2 adjacent cylinders. When you disassemble, look closely at the gasket and block/head surfaces for either damage or a...

I don't think I'd bother warming it up and rechecking. If everything on your gage is working correctly and compression really is 200 PSI, a little heat isn't going to get you into spec. Unfortunately it sounds like its time to pull it apart. Wasn't there another member recently with low...

Here's the link to the compression gage adapter that Jim C was thinking about. http://www.steelsoldiers.com/showthread.php?83566-Compression-Testing-on-MEP-002A-003A it gives some dimensions if you can machine or fab-up an adapter. I think any store bought Compression gage will hava a schrader...

Bill, I've been away from this thread for a while so maybe I missed it, but have you verified the linkag and solenoid next to the IP is moving freely and not binding up? Also, have you tried starting it with the throttle pushed in rather than at operating speed? One of my units does a similar...