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Old 11-02-2012, 02:14 AM   #184
baseballdbk1
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Member#: 242700
Join Date: Mar 2010
Chapter/Region: Tri-State
Location: Pittsburgh, Pa
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2015 Impreza Wrx
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Quote:
Originally Posted by Crystal_Imprezav View Post
Was just looking out for you as many machine shops will just feed you BS. As for the rest, to me, it looks like whoever assembled the heads last time failed to check the casting where it was damaged for contact when everything was warm. As a rule, you generally want +.002 at any point that potentially may make contact. I would guess, the cam made contact with the head causing it to deform the lobe and therefore upset geometry and kill the bucket.
Thanks for looking out but I can assure you that this is not one of "those" type of shops...

The machinist who did my work is very honest and does amazing work!
He kept me very up-to-date with how things were coming along, put in a lot of hours of work into making things were as close to perfect as possible, documented all of my clearances, bearing sizes, etc. and gave me a copy of everything encase I ever wanted to look back to see what my clearances were set at as well!

As far as the camshaft, I can guarantee you that the camshaft did not hit the casing because he set them to .006 clearance just like he did for the 220-D cams that are in the pictures I most recently posted and the casing around the bucket showed no sign of being hit on disassembly after the failure

It is very hard to point the figure at one part vs the other as to what caused the lobe to grind down through the bucket and break the valve stem which sucks but oh well and move on...
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