PO failed to put anti-seize on the spark plugs, so the rear three snapped at the gasket seat.
Might have been the plug design, too, as the Champion plugs are notably thin at that point, with a sharp inside shoulder. Stress riser, anyone?
Was able to pull the electrodes out, so there's no loose trash in the cylinders.
I'd like to get them out without pulling the head.
Current plan is to heat them up with a MAPP torch, then apply paraffin to the threads, and try getting them out with the (hateful) ez-out.
When that fails (and it will, I've never had good luck with the ez-out), I'm going to turn down some grade 5 bolts to fit the holes (I have a metal lathe), then silver solder the bolts in with high temp silver solder, and go after them with the breaker bar.
If that fails, and I can't picture that it will, then I'll go after them with the air impact wrench. I am concerned about breaking the plug seats with this, as the wrench can generate 625 ft-lbs - great for taking off lug nuts, not so good for much of anything else, and no good for putting anything together.
Any other suggestions?
Kirk
Might have been the plug design, too, as the Champion plugs are notably thin at that point, with a sharp inside shoulder. Stress riser, anyone?
Was able to pull the electrodes out, so there's no loose trash in the cylinders.
I'd like to get them out without pulling the head.
Current plan is to heat them up with a MAPP torch, then apply paraffin to the threads, and try getting them out with the (hateful) ez-out.
When that fails (and it will, I've never had good luck with the ez-out), I'm going to turn down some grade 5 bolts to fit the holes (I have a metal lathe), then silver solder the bolts in with high temp silver solder, and go after them with the breaker bar.
If that fails, and I can't picture that it will, then I'll go after them with the air impact wrench. I am concerned about breaking the plug seats with this, as the wrench can generate 625 ft-lbs - great for taking off lug nuts, not so good for much of anything else, and no good for putting anything together.
Any other suggestions?
Kirk