7.3 idi another head gasket/ cavitation/ head cracked question/ say it isnt true...

[dogodell]

so... sorry this is a little wordy but wanted to make sure all the info is in here...

long story short junkyard motor... long complicated motor swap with custom drivetrain into an older ford.... I was told motor was a low millage running perfect and was pulled due to bad trans and other issues with an older wrecker that belonged to the junkyard... tested the motor and it had good compression +/- 400 psi if I remember right...

finally got it all in with all fluids and massive coolant leak out of the exhaust pipe and into the oil...

first check... the coolant leaks down into pan overnight (first indication of block being cracked??)

2nd check... cooling system fails pressure test...

3rd check... cavitation test (valve covers off... valve train components off... 100-175 psi through glow plug hole... forced piston to bdc and re-pressurized) result is coolant overflow from radiator (almost instantly) at 75-100 psi...


because the coolant also leaks out from the radiator into the pan overnight I am assuming that it is indeed a cracked block and not a cracked head.... ( i forgot to repeat leak down test with piston at tdc but I will try this first thing in the morning)

so.... anybody see any flaws with the above tests or logic I am new to these motors and would love somebody to point out something that I might be wrong or some way that this might still be a head gasket??? (i haven't pulled the heads yet in case the junkyard is going to be really extra nice and decide to take it back even with no warranty...)

thanks in advance for any advice

 

[icanfixall]

Really the best way to know for certain that the head or the block is cracked is to remove the heads and have them tested. So you know what cylincer is filling with coolant... Thats a good thing to know because that is where to look closely for problems. Sorry to hear someone sold you a bummer of an engine too. Thats no way to treat a customer by lieing to them about the engine condition.

 

[zebrabeefj40]

Coolant leaking into the pan could be as simple as the oil cooler being bad...but coolant out the exhaust pipe is another animal altogether.

 

[RLDSL]

Junkyars wont warrant an engine as running, but most ALL will warrant them as being a rebuildable core ( in fact, I have never heard of one that wouldnt ). If the head gasket is blown, or oil cooler seals blown no warranty, but if the block is cavitated, you should be able to get your money back., so you need to pull the heads and find out where the coolant is going