Quote:
Originally Posted by FrankF3
I had an old-timer tell me he had a trick to clean the aluminum off of the crank journals. He would go to the hardware store for some muratic acid that is used for masonry jobs. Dip the crank journal in it and let the aluminum dissolve. A slight polishing was usually the only thing that was needed to clean up the journal afterwards
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I have done several twin magnum, series II and V twin commands with success (all pressure fed oil), but seldom got away with it on the singles as typically I think the crank on them were wore before they seized. I found it best to brush the acid on in a WELL VENTED area. I tried submerging one once and it ate in to the crank. My experience is clean it off with acid and a tooth brush, a quick polish with the back side of emery cloth and oil, then mic it. If it checks OK (with in .0005 of stock), use it providing it did not get so hot to dis-color the crank. In most cases I think the engine had an oil leak prior, and they ran it out of oil.