Originally posted by DesertBMW
View Post
Anyone here build a motor and not have the head resurfaced?
I’ve never reinstalled a head that wasn’t resurfaced while it was off.
Little background on my head... I put this b25 in my 325e and after some time its coolant consumption kept getting worse. Not to the point where I’d say the gasket was blown but definitely getting some leakage into a combustion chamber. So I pulled the head and didn’t see much wrong with anything, head was flat enough overall and the gasket didn’t look terrible. No binding in the cam or rocker shafts so confirmed it wasn’t warped. Brought the head to the machine shop and had him check for cracks, surface it, and do a 3 angle valve job if everything checked out. Everything checked out, no cracks, valve guides in good shape, flat enough to surface and still within the deck height requirements. When he skimmed the sealing surface there were low spots. Upon closer inspection the head looked like it was gone over with a scotchbrite wheel earlier in its life. Indicated by some soft lines around the domes and a few low spots where there was less material, like between the coolant jackets and the domes and also between the domes. Still, my machinist had to take .004” off to make it flat. That’s not a ton of material... At the end of the day, besides being gone over by a scotchbrite wheel which led to coolant leakage, the head is in otherwise perfectly useable condition. So why wouldn’t I put a cam in it?
Comment