Welcome Visitor! Please take a few seconds and RCC
Well-Known Member
Hey TRS'ers,
Got a question about spark plugs in 4.0 motors.
I have a '97 Ranger with the big V6.
Changed plugs a few years back, no problem.
Other day I wanted to replace them again.
Went to local parts store, asked for same type/number but
they were out. Said that particular plug had been superseded.
Asked me the usual vehicle questions, did the cross check on
their computer, came back with the "compatible" replacement.
The new plugs have double the thread length of the ones
specified for my engine. Went around and around with the
"mechanic"/register jockey after I told him that was not
the one I need.
Showed him the MotorCraft OEM plug(AWSF42P) that I had
used last time. That one has very few threads. He kept telling
me it did not matter.
While the long thread plug would fit(they both the same shoulder height)
who wants a plug with half the threads poking out of the head?
Surely that has an affect on the heat range it was designed for.
Never got the ones I wanted. Parts dude finally came up with Autolite 765AP. They are short thread and truck runs fine.
Anybody know what the deal is about the thread length difference?
Is it due to changes when Ford went OHC with that motor?
RCC
Got a question about spark plugs in 4.0 motors.
I have a '97 Ranger with the big V6.
Changed plugs a few years back, no problem.
Other day I wanted to replace them again.
Went to local parts store, asked for same type/number but
they were out. Said that particular plug had been superseded.
Asked me the usual vehicle questions, did the cross check on
their computer, came back with the "compatible" replacement.
The new plugs have double the thread length of the ones
specified for my engine. Went around and around with the
"mechanic"/register jockey after I told him that was not
the one I need.
Showed him the MotorCraft OEM plug(AWSF42P) that I had
used last time. That one has very few threads. He kept telling
me it did not matter.
While the long thread plug would fit(they both the same shoulder height)
who wants a plug with half the threads poking out of the head?
Surely that has an affect on the heat range it was designed for.
Never got the ones I wanted. Parts dude finally came up with Autolite 765AP. They are short thread and truck runs fine.
Anybody know what the deal is about the thread length difference?
Is it due to changes when Ford went OHC with that motor?
RCC
