1985 300D Turbo, 80K on rebuilt engine - Idle has small shake that increases with rpm to about 1200+ then smooths out a little, but always a little off. Just sounds different than other diesels, no smoke, fuel economy poor - getting only 20 on the highway, I suspect the IP....

I can get my hands on a 81 Turbo IP that has been bench tested and was wondering if i can slip it in. The only physical differences i notice is lack of electric box on block side (behind injector #1) and the banjo bolt coming off the ALDA does not have vacuum line branching off to transmission transducer (blue flying soucer) which i can grab from my old 85 pump. Both of these items i believe are 85 additions. The part number is the same, almost, for both

1985 Bosch # RW 375/2200 MW 28-3 (with a 3 superscript) RIV possible
1981 Bosch # RW 375/2200 MW 28-1

Compression even, and in the high 300's
Injectors popped and balanced
Replaced 1 engine shock, both motor mounts
Timed the IP, twice
New tank screen, pre and spin-on filters
Cracking the injections lines one-by-one gives sames results
Diesel purged
Chain stretch @ 2 degrees via marks on cam tower and reading the balancer


Has anyone out there replaced turbo IP without pulling oil filter housing? i have IP, and if needed, oil filter housing gaskets. Any help is welcomed! Any other ideas???

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1985 300D, 250k
1980 300SD, 180K