Painting head gaskets WTF??? pros come in...
01-23-2009, 11:04 PM
#21
Well not trying to be cocky (but honesly admitting 3/4 fith of this new 92 proof rum) but i always to to put myself above the average 38 ahours. I coated my engien down with 2 cants of pb blaster already broke every exhuast manifold loose to make sure none were going to break. We did a heater core swap ona friends moms 99 or something dakato which was an 8 hour job in 4 hours with beer breaks and a made ac line dis connects outs of his extra aluminum siding.... sorry forgot what the thread what. I had the all adata downloads i dont need to remove the turbo but i am replacing the water pump but i fugure i day to remove what i can and a day to replace after the heads milled
01-24-2009, 10:28 AM
#22
Haven't read through everything here, but copper spray on Cometics is a good thing. Search, & you will find more "new" cometics that leak coolant after an un-sprayed install than will be found that don't leak. I was fooled once by the "no need to spray Cometics", thing & had leaking head gaskets; never again for me.
01-25-2009, 06:36 AM
#27
I sprayed a light coat of Hylomar on my Cometics. I also spoke to Cometic prior to doing so and they told me it was OK to do so. They said it would help fill minor imperfections even though I checked the heads and block with a machinist straight edge and a Profilimeter.
01-25-2009, 11:54 PM
#30
OUCH. I hate that for you on the Duramax--they are not fun. I've never had to do head gaskets on one, but I can tell you that they are NOT fun to work on. Do yoursef a favor and buy up as many variants of a 5mm allen socket that you can find. I agree that copper coat won't hurt anything, and I've never used a Cometic, but I've NEVER seen a GM mls gasket leak anything under normal operating. Do it, if it makes you feel better. 
01-26-2009, 06:22 AM
#31
Yeah i bought some ball end and swivel 5mms for the valve covers as wll as all sorts of exentions and have caoted the engine with 2 cans of a pb blaster so far.ell as all sorts of exentions and have caoted the engine with 2 cans of a pb blaster so far. I've got the GM sealent too. It dont think it will be too bad to do, just time consuming.
