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Originally Posted by Ketch
this is for 98 with 5.7L
I fixed intake manifold gasket leak at 50,000 miles.
2 years later, with 77,000 miles, coolant began disappearing.
I found coolant mixed in the oil on th dipstick.
Yesterday I pulled the intake manifold. It is covered with light brown sludge (oil and coolant recipe). The engine was running fine and we did not drive it much when the coolant started disappearing. So I'm going to replace the intake manifold gasket again. But first I have to figure out how to get all that sludge out of the engine.
I read some shops have engine oil flushing machines that would clean all this crud out.
Or I could try one of those flush products you run in the crankcase for 5 mins.
Anyone have any experience with removing coolant contaminated oil?
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http://www.fullsizechevy.com/forums/...8&page=4&pp=20
Read the tread at that link!!!!
There are several types of gaskets... Don't let anyone fool you. You want the one from GM that has metal inserts were the bolts go so that you do not over torque the bolts. And it keeps the plastic from getting crushed from the expansion and contraction with heat and cold. I used felpro and I am sure I will be in the same boat as you, and have to change them again.
As far as the gunk in the engine. My first and hardest advice is to pull the oil pan. Clean it with b-12 chemtool and with the intake removed spray down the lifter valley.
The half a$$ way would be to plug the oil drain holes in the lifter valley and get to cleaning with anything you can... screwdrivers, towels, compressed air... ect. till you get the gunk out. When you get it to the point that it is film and not chunks of crud. Hose it down with b-12 and let it go into the pan... change the oil... run it for a 100 or so miles... use a can of chemtool as directed for crankcase. and change oil again.
Hope this helps... good luck!!!