Re: Best way to break in a rebiult motor

Posted by RAB on November 27, 2004 at 23:38:55 from (195.93.34.11):

In Reply to: Best way to break in a rebiult motor posted by Bill from Seneca, IL on November 27, 2004 at 18:06:38:

When you say "rebuilt", what do you mean?
new pistons in a new bore?, reground crank?, new valve guides?, new/overhauled oil pump?, cleaned out oilways/galleries?, cam checked/reground?, timing gear overhauled?, water jacket checked and cleaned out? etc, etc, etc? Or just new bearings on an old crank and new piston rings?
If you have top end and not the bottom, you need to run in at reasonable throttle and fairly light load to keep oil flow up and bearing load down. Keep the engine at proper operating temperature. Check security and tolerances of anything that can loosen or change clearance.
If it has bypass oil filtration, change the oil after just a few hours - cleaned oilways or not.
Top-end lubricant is a good idea, but don"t overdo it. As suggested, use varying speeds and loads without excess of either. A final fairly heavy work-out to completely bed in the rings would not go amiss before changing to a modern super lubricant.
Those old manuals were right in saying the running in period set the scene for the life of the engine, but remember that when the tractor was new, the whole tractor was being run in, not just the engine and the manufacture did not want unnecessary warranty claims or early failure after the warranty period - not good for sales!
RAB

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