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squanch253 YouTube channel dose some great explanation on videos of the D2's and RD6's pinion clutches and pony engines. The pony engine blocks used by the D2 and D4 models were similar from 1932 to early 1960 - late 1960 through 1964 Pony engines were classified as NOS.Were the pony engines still running like that? The Cat 12 grader we bought has a noticeable "clunk" in the pony as you crank on it with the starter, but no noticeable rattle once it's running. Then again, once it's running, everything is clattering and rattling, so who's to say...
I'm guess I'm wondering if we also don't have some wasted rod bearings... I am not excited to pull it all apart, that's for sure... The oil we drained out smelled very faintly of gas, and there was no way to shut off the flow of gas to the carb as we bought it. There is now a shutoff inline, and some fresh 15w40. I hope to hook up the shutoff in the cab at some point.
Thanks for the pics!!
Chris
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Hi Dan,
that would be my estimate too.
Degraded oil has a low lubrication ability and metal to metal contact takes place so causing the metal transfer/pullout when the lower melting point bearing material melts and adheres to the bearing journal.
Scans below from Cat Engine Bearing Failure Analysis Book shows this type pattern under the heading of Adhesive Wear.
Cheers,
Eddie B.
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