Hi Heather,
Withour seeing the truck I am going to assume that the time cover must have a coolant port that allowed the coolant to leak out, or maybe the water pump was the original leak...Hard to say. I don't know if the the timing chain cover has anything to do with the problem, but it should have been making a fairly loud sound as it has been grinding away at the cover.
So setting the timing cover aside, I would think you must have had an overheating sttuation. When the coolant level goes low (water pump leak), the engine is no longer being cooled adequetley. Thpically the head gasket or cylinder head will become damaged and can set up a scenario where the coolant enters the combustion chamber or the compressed air from the combustion chamber starts to over pressureize the cooling system. The radiator can't handle the pressure and it becomes an escape valve by blowing open.
It can be a quick thing depending on how bad the original leak happened, a water pump bearing can fail and lose coolant VERY rapidly.
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Saturday, September 15th, 2007 AT 5:34 PM