Posted by NCWayne on September 20, 2012 at 14:27:14 from (69.40.232.132):
In Reply to: prevent glazing posted by thunderbolt on September 20, 2012 at 12:44:52:
If your talking about the bore and rings getting glazed and causing the engine to start slobbering oil, then BonAmi is your best bet. Like others have stated CAT used to recommend it for seating the rings in their engines when all else failed, and if you look in the right, old manuals, they even had a part number for it. Heck, if I remember right I actually saw it in one old manual called for by name.
Personally I've done it only once, but it worked like a charm. I rebuilt the engine in a specialized 165 MF that was used more as a power unit than anything else. I have no way to dyno and break in an engine, so I told the customer to get her warmed up, then 'pull her ears back and make her grunt' for the first few days. They didn't do it, let it idle along like normal, and within a week it was slobbering oil out the exhaust. I went down, removed the air filter, and with the engine at wide open throttle I sifted about two tablespoons into the airstream, replaced the filters, and then just let it run for about 20 minutes. With it already hot I watched as the oil that was slobbering out the exhaust stopped about 5-10 minutes in, and then what was already in there started burning off. That was about 4 years ago and it has never slobbered any more oil since, and it still starts and runs like a new one, regardless of the outside temp. In other words it still has good compression so the BonAmi treatment doesn't appear to have hurt anything but did take care of the glazing problem.
Beyond that all I can say is good luck, and like anything else, your milage may vary, but it worked for me.....
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