Originally Posted By: Dave9
This is abnormal, I suspect a combination of not torquing them enough then cleaning your engine perpetually with water and letting the threads rust out.
Lol! I never clean engines because it causes too many problems. Ive posted my engines on here before and people have insisted I need to wash it. Nope, not gonna happen.
Originally Posted By: OVERKILL
That's impressive if anything. Do you have a borescope to take a peek at the underside? I agree with you that it may be "unrepairable" as in the head would need to be removed and welded, then worked, then an insert put in.
I do have one of those $20 usb ones from Amazon. I have to get a USB-C adapter cause I upgraded my phone a few months ago and obsoleted all my adapters and charging cables.
Originally Posted By: andyd
That is a deep reach plug. How does it "blow out" ? There is nearly an inch of thread on the plug. Could somebody s'plain the mode of failure to me? Once again FOMOCO metallurgy fails to impress. Colt45ws isn't at fault here. TIA
While the plug has an inch of thread, in reality only half of that is threaded in the head itself. People call these the 4 thread heads because you can count only 4 threads holding the plugs in.
Originally Posted By: Kruse
I'd bet it was giving indications of a problem for quite awhile, but like you said, if your stereo was cranked, I guess you didn't hear it.
Which cylinder was this one? Like you probably guess, I bet this one will require a new cylinder head.
#3. Second from the back on the passenger side.
Originally Posted By: Canadastang
Is this the generation of 2V's that only had something crazy like 4 threads?
I know in later years they added more threads to prevent this from happening.
Fordtechmakuloco advocates overtorquing the plugs to about 20 ft. lbs, instead of the called for 10ish ft lbs. I did that on my Town Car 6 months ago and no issues.
Did you use a torque wrench on the last plug change?
Im not convinced 20ftlbs is safe on the 4 thread heads. The later heads, yes and I have taken a torque wrench to my other engine with 8 threads and torqued them to 20ftlbs.