tukkus

My Feedback: (2)

i need to rethread for the glowplug and i was wondering if anyone knows the size of the tap i need...i don't even know if it is metric or standard, i'm sure it's metric but i really don't know

MrMotor

Glow plug threads are 1/4 X 32 which is a special American thread size. Harry Higgly has the taps available because they are almost impossible to find using the usual hardware sources.

chris6414

My Feedback: (10)

I'm pretty sure Tower has a tap for that.

huey-pilot

My Feedback: (17)

Tower Hobbies have these taps and dies. I have both of these, I use the die most often to ensure that the plug thread is true and won't cause problems when installed in the engine. Sometimes a new glow plug will have a rough spot that can cause problems when installing, screwing it into a die will correct this and reduce problems with ruined glow plug threads.

MrMotor

If the threads are ruined Clarance Lee in California can install a heli-coil in the head if it is sent to him. He advertises in the classified in RCM every month.

RC-Captain

why not just buy a new plug or head ?

MrMotor

Four Stroke heads are NOT cheap.

doubledee

My Feedback: (4)

You can probably buy a new magnum engines head for less than the cost of sending it off and having a heli-coil installed.

I don't know about re-tapping it as the glow plug hole is probably oversized as a consequence of stripping it out.

doubledee

RC-Captain

Not to argue with you but an engine of that status , it may be better of bying the head new to avoyed more damage and prevent a crash. I had to by a new head for my OS .40LA because it wasn't seatting right after a crash and the engine would keep running even with the carb closed. Good luck.

ChuckN

The heli-coils used to repair stripped threads are MUCH cheaper. I repair stripped glow plug threads for $10.