Posted by dboll on December 28, 2011 at 17:27:30 from (64.61.211.97):
In Reply to: Case 730 Diesel posted by RBiela on December 28, 2011 at 09:50:00:
any possibility the piston is hitting the valve at tdc due to improper machining from the factory? Case's machine tools were well worn by the time the 70 series came out making it difficult to turn out quality work. And of course the 30 series were right before that. Many 504 cranks have the thrusts worn because the bores were not quite square to the deck. One would think the valve would break first but I've seen stranger things happen. Just throwing something out there to consider. We always used either and never had a problem. Are these original cast pistons or aftermarket aluminums?
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