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Old 09-10-2007, 11:56 AM
mcguirjf mcguirjf is offline
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Join Date: Jul 2006
Location: East Hampton, CT
Posts: 204
Update

Greetings!

Well this was a very busy weekend. My compression gauge came in on Friday and pulled some numbers.
Cylinder/Pressure
1/425
2/425
3/400
4/400
5/400

I cranked for a ten count per cylinder, and I think the new battery started to lose juice. So compression is Good! Thank god because I bought this engine from a salvage yard months ago and I'd be "very mad" if I had to ship it back.

So yesterday I paid a visit to Tom at Yankee Diesel in CT to see if I had a fuel issue. Tom is very knowledgable in MB diesels and his shop is awesome. After talking with him the possible causes of my problems are...
-Engine Timing
-TDC Location
-Timing Chain Off a Tooth

Well I shifted the chain one tooth and the cam and harmonic balancer would not align and be off by 20 degrees. Next I swapped in the injectors that were in the original engine. I noticed a better idle and less knocking, but still same amount of smoke and ran the same.

I pulled the connector off the idle control on the IP and the car stalls. According to the manual the idle is suppose to increase???

I also pulled the intake manifold and found very little black slug inside.

I have to believe that my problem is either or both injectors and injector pump. I'm going to have all (10) of my injectors pop tested and have the IP bench tested. I am thinking of running some diesel purge and rebuilding the delivery valves, but I feel that I'm just waisting my time.

One thing to also note is the IP is off the engine that originally came with the car. That engine died because the oil pump drive sprocket was rounded smooth and as a resultant had no oil pressure. What affects of no oil pressure have on the IP???

I also noticed some damage on the IP where it interfaces with the engine. A copper or brass colored "thimble" is dented in. I don't know its function, but it could be related to the problem. See Picture.

Please keep the help coming.
Thank you!
Attached Thumbnails
1990 300D 2.5 Running Rich-dented-thimble.jpg  
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