Question about 1999 GMC Safari
Cracked Heads, Cracked Block, missing chain guide for the timing belt lets it wear a hole in the cover which lets water mix in the oil. You are looking at tearing that engine down to find the problem.
Posted on Jul 07, 2010
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Posted on Jan 02, 2017
SOURCE: 1983 Ranger
you have to pull it aprt again even though you changed the head gasket,did you plane your heads first,you might have an uneaven surface,but once you pull the heads off,try to check the cylinders with a bright light,check around the top of the cylinders it usally cracks there,a hairlane crack is all it takes,your probally going to have to pull the motor,and bring it to a machine shop,they can plane the block,and heads,and they can check it for cracks,if you have a cracked block they can put a sleeve in the cylinder thats cracked,but if I was you I would grab a junkyard motor and throw it in,I dont know what condition your truck is in but spending all that money on a 83 I would just grab junkyard motor
Posted on Jul 13, 2008
As long as the heads are not damaged from overheating repairing would be an option rather than replacing the engine. Get advise from a mechanic you trust. The intake manifold gaskets are the most common problem with this vehicle if you have the V6 engine.
Posted on Jan 30, 2009
HI. If your car is equipped with an engine oil cooler that uses coolant to operate, this would be a good place to start (This is a big issue in some GM vehicles). Sometimes an engine oil cooler can act like a one way valve. When the engine is not running but is still hot the cooling system will have about 15 pounds of residual pressure forcing coolant into the engine. This problem can be repaired by replacing the engine oil cooler. Once the oil cooler has been replaced you must replace the engine oil and filter and recheck for the conditions once more. There are three remaining causes for coolant in the motor oil, and they all require you to dismantle the engine. This can be tricky because the repair overlaps and it is difficult to tell which one is causing the problem. For example: A mechanic has told you that the cylinder head is cracked, or warped, and as they start disassembling, they have discover it was the intake manifold gasket that has failed. It's up to the honesty of the repair shop to tell the customer that the cost of the repair will be less. Or the opposite can happen, example: A repair shop has told your engine has a blown head gasket, once the disassembling is complete, they inform you the head gasket is ok, and the cylinder has been pressure checked and is ok. This only leaves the engine block as the failure and must be replaced to repair the problem, and that can be very costly. Always check the intake gasket first on V6, V8 and V10 engines. Then the cylinder head gaskets, cylinder heads and finally the engine block.
Posted on Dec 10, 2009
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