Posted by LJD on January 12, 2012 at 08:38:24 from (75.213.33.22):
In Reply to: Head Rebuild posted by Butch LeBlanc on January 11, 2012 at 18:15:14:
If it actually has seat-inserts-it's not very difficult to pull them out and press in new ones. If no inserts - you can either grind (or cut) a new seat if not too bad . . . or have a machine shop cut the head so hardened inserts can be installed. Cast-iron heads are easy. Aluminum heads usually require super-cooling the seats before installing. I use liquid nitrogen since the local cow inseminator always has some available.
If cutting or grinding seats - depth is critical on many diesels - and not so critical on many gas engines. You just have to reclaim any lost spring tension by adding shims to offset any valve depth added by redressing. Increasing valve depth takes tension off the valve springs.
As to valve guides - some are inserts and are easy to replace with a press. If not? They can be knurled and resized if not too bad - or - machined for new inserts.
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