IMHO, one needs to throughly clean the whole deal rather you just take
things apart (to replace bearings, rings, etc) or a rebuild that includes
machining.
Even if your block is cleaned in a solvent tank you need to clean all of the
oil passages, most commonly using gun cleaning brushes and solvents, and
replace all plugs. Sometimes you use threaded plugs, sometimes standard
"freeze" plugs. You also need to replace cam bearings (in a pushrod motor)
anytime you "tank" a motor. Once that's done wash everything with soap and
water. Use a power washer to get any gunk and solvent out of the small
passges and blow everything out with compressed air.
Royal Purple and other companies offer assembly lube that's primarily
designed to lube bearings and such upon first time start until oil pressure
builds up. Even if you "prime" the oiling system it's a good idea to use
assembly lube on bearings and plenty of oil on pistons and cylinder walls
when you bolt it all together. Fire the motor up, make sure you get and
sustain oil pressure. If that's okay, run the motor for 15 to 20 minutes at
or around 2K rpm, thern shut uit down and dump the oil and filter.
Is that a bunch of work? Sure, but it makes a lot of difference in the
quality and longevity of your rebuild.
--
Ron
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