I found the problem today. The lower silent shaft rear bearing is shot:
I think I figured out why. When I had the engine rebuilt, I cleaned all the parts that the rebuilder did not get. The 2 front covers were some of the parts I cleaned. When I put together the counter-rotating gears, I must have not timed them correctly. I compared the shaft to the timing gear with a spare front lower cover, and the two shafts are not in the same spot. That probably caused so much vibration, that it took out the silent shaft rear bearing. I may have to pull the engine again, bummer....
-------------------- All Diesel Fleet:
1985 Mitsubishi 2.3 Turbodiesel Pick-up, 1983 GMC Van- 6.2 Diesel.
Benzs: 1995 E300 diesel, 1980 300SD, 1982 300CD, 1983 300D, 1985 190D.
1980 AMC Eagle Limited Wagon powered by: 3.6 Litre I6 VM Turbo Diesel Engine (one of fewer than 10 made, only 2 known to still exist)
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