RPScustoms
New member
Edit: that would be #2 #4 #6 and #8 on the drivers side my apologies
97 F-Superduty 4wd Build (Pic Heavy)
- Thread starter RPScustoms
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RPScustoms
New member
Finally got the problem side head pulled off, no sign of valve/piston contact, valves are seated perfectly, no crack in piston, I do see a very slight score in the cylinder wall but not enough to indicate ring failure. Any of you gurus have any ideas before I tear it all the way down?
Pour brake cleaner in the exhaust ports and intake ports and see how many and which valves leak. Did you ever do a leak down test in this? I didn’t read back that far…
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RPScustoms
New member
I did not perform a leakdown test, but there was no "popping" sound in the intake or exhaust when running, and no more blow-by than there was before. The valves appear to be sealing perfectly. these heads are only about a year (of use) out of the machine shop, brand new valves, seats, seals, springs. I will attempt a backwards leakdown test on the valves thru the exhaust port and intake plenum and report back.
1.5" adapter spacers and a questionable amount of grinding on the outside of the caliper
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RPScustoms
New member
By putting a bit of air pressure to the exhaust ports (im aware thats not how valves are supposed to work but here we are) and spraying soapy water I found all exhaust valves on that side to be leaking progressively worse from #2 (barely any) to #8 (a lot). There's definitely some pitting on the #8 valve but does it look like something went through it? piece of a piston ring maybe? The seal on that valve also fell right off when i removed the valve. Any guesses on cause? Going to pull the turbo and see what the exhaust wheel looks like as well.
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RPScustoms
New member
Sorry for a very delayed update. Ive determined the used intercooler i installed just days prior to the failure was the ultimate cause. Must have had some dust/debris/oil in the bottom and managed to suck enough through the valves to trash them. I am curious why only the exhaust valves show damage though. Anyway.. motor is out. heads are going to the machine show for a checkup and valve job
