heads cracked ? whats the chance? - Ford Powerstroke Diesel Forum
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Old 07-15-2013, 02:42 PM
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heads cracked ? whats the chance?

04 f350 puking out the degas bottle when i tramp on it (SCT live wire ts w/ MPT custom tune called bazooka) up to 35 psi boost
i filled up the degas bottle to the top and started the truck, yup bubbles coming to the top every 5 seconds, i was told the HG is blown

my question is.... i had ARP head studs done at 90 k truck now has 160 k
what are the chances that the head or heads are cracked? i cant see the hg being the only thing wrong considering i have head studs

my second question is.. could i get air in my coolant from a leaky injector cup and how common is that?, i was WELL over the limit on my last oil change and could smell diesel in the oil when i changed it, i had a "sticky" injector or something till i added REV-X truck runs fine now,
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Old 07-15-2013, 08:05 PM
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Do you remember what gaskets you used? I have heard that some of the aftermarket gaskets have been found to fail even with the ARP studs.
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Old 07-17-2013, 12:35 PM
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it was done at the ford dealer under war. at 90k, i just ran in with a box of head studs. so im guessing an oem hg
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Old 07-17-2013, 01:42 PM
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I'm going through a similar situation. Ford dealer did HGs at 50K with ARPs and now at 100K I am pulling the motor myself to do things right. With no record of cylinder head machine work on my OASIS report, I can only assume the dealer slapped new gaskets and studs on without cleaning/truing the heads and deck. I won't know "for sure" until this weekend when I disassemble the motor.

FYI. the heads are known to micro-fracture around the valve seat. I've budgeted for the machine shop to cut out the integrated valve seats and press in steel valve seats (plus a 3 angle valve job and new guides, ect...). However, it is rare that these cracks will be deep enough to reach the cooling passages.
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Old 07-17-2013, 01:53 PM
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Head gaskets can still fail with OEM head gaskets and studs. Even if the install was done correctly and there were no issues with the heads at the time. I don't know how you drive your truck or what tune you're running, but 70k miles have passed. It's very possible that your head gaskets are blown again. It's happened to me. Twice.

Based on your symptoms, it sounds like they are. A good indicator of a cracked head is fuel in your coolant. However, it's possible to have cracks in your heads without having fuel in your coolant, but not with the symptoms you're describing.
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