Snap on has a thread chaser, renewer, that may save the day----

If this doesn't work, a heli coil will be your only savior---

If done carefully, and depending on which plug hole it is-- it could be
done without yanking the head---

Later,

Terry

E-mail message

My spark plug blew out yesterday, I tried to thread it back in and it
wont go. I think I need a helicoil or a new sleeve? Can the cylinder
head be removed with the engine in the bus? anyone ever done this. I
need the bus fixed for Natural bus so I'm running out of time.