Quote:
Originally Posted by Mopar Mike
I haven’t ever seen this before, but the crank looks to be pushed forward from the torque converter and is wearing down the thrust bearing. This is a cast crank 340; there is about a 1/8 to 3/16 gap unbolted between flex plate and converter. Spins freely, and moves back and forth easily. The forged crank 340 has no problem with same Trans and converter. Any ideas?? Thanks,
Mike
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Did you check the end play with a dial indicator on the crank with the main thrust torqued to spec. ? Some I have checked have been zero or .001. I have almost ALWAYS had to sand the main on a piece of glass with fine grit paper to get the correct end play on 340's and 360's. Sometimes 426/440 engines also. Hold them together by hand and use a little WD-40 or ATF and sand a little of each thrust surface (front and back) in a circular motion using the glass plate or a granet surface plate with the fine grit paper and lube to keep the bearing halfs together and flat then wash them check again. If you take to much then its new bearing time.
Of course you might have another problem but I found this to be a good fix in my case as the same problem came about on a 340 several years ago. I used to do it on 428 S/S Ford CJ's also.