I am in the middle of doing a head gasket on a 95 sunfire 2.2L 4-banger. I got the head off, its not cracked, but appears to be warped. I went to the local machine shop and asked if they could machine it no more then 10 thousandth of a inch to comply with valve clearance and they said they couldnt beacuse the head was too warped.. so i went to Acre Auto Salvage to get a head and the guy there told me to get new head bolts and gasket, put the old head back on, tighten the bolts in the correct pattern and to the right tourque specs then let it sit over night, come back and tighten them again. He told me that cast aluminum heads flex when u take them off so when u do what he told me, it gives the head time to settle, he then told me to flush the coolant out twice, then fill it with water and ad just a little bit of Sodium Cylicate to seal it up. This idea makes some sense to me, but i would like a few more opinions on this topic before i do anything. What do you think? GotMud?
Never herd of it but it kinda makes sense...I know ur aposed to replace the head bolts anyways because they only stretch once
hmmm i'd have the origional one milled flat, then use a HIGH QUALITY head gasket.. torque it all back to factory spec.. might as well have the valves checked out to see if its all good!
and USE NEW BOLTS!!!!!!!! they are called "torque to yield" meaning they are made to stretch!
Quote from: Eroq on February 24, 2011, 11:49:10 PM
hmmm i'd have the origional one milled flat, then use a HIGH QUALITY head gasket.. torque it all back to factory spec.. might as well have the valves checked out to see if its all good!
and USE NEW BOLTS!!!!!!!! they are called "torque to yield" meaning they are made to stretch!
Well i was going to get the original head machined, but to machine it flat they would have to take over 1 tenthousanth of and inch off and i am afraid it would cause the valves to hit the pistons then i would have a real mess on my hands
Contact the dealer service department and find out maximum allowed mill. ;D
or have them mill it as close as they can to stay within spec!
Mill it as far as they will go get good gasket torque down and get some of that head gasket sealer from a truck stop and you'll be good to go. I would never reuse head bolts but to each there own.
Im sorry but having that head that far milled down id be scared shitless of that piston wreaking the vales. Id go get a reconditioned head and be done with it.
Have them put it in the heat treat over for a little bit and see if it will straighten out from the heat. They did that to a friends of mines heads from his durango. Ended up getting them close enough to machine and is running and going good now.
Mill it and then run a thicker head gasket to keep compression/valve clearance in spec.
Personally I would just mill it and enjoy the extra compression...your valves are not going to hit a piston unless your timing belt/chain slips or breaks.
Quote from: Disturban on February 26, 2011, 04:31:54 AM
Mill it and then run a thicker head gasket to keep compression/valve clearance in spec.
Personally I would just mill it and enjoy the extra compression...your valves are not going to hit a piston unless your timing belt/chain slips or breaks.
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