stripped glow plug threads
 

I got a OS 32 SX-H helicopter engine with stripped glow plug threads. I know there are a couple of places in the magazine ads that will repair them. Is there a kit available that will allow me to do it myself? Does anyone know the thread size? I thought it might be possible to use a heli-coil if I knew what size to get. A new head is about $40.00 so I'd like to give it a try before I buy a new one. Thanks guys, Matt.

stripped glow plug threads
 

You should be ok with a heli-coil kit.

Just take a Glo-plug along to the hardware store and tell them what you want to do. They will be able to give you the right size.

stripped glow plug threads
 

The threads are 1/4 32. You can get metal threaded incerts or a helicoil.


Dru.

stripped glow plug threads
 

Glow plugs are 1/4"-32. Your not going to find a Helicoil kit for them at the hardware.

I must ad here that 1/4"-32 is a unusual thread dimension. 1/4"-20 is the standard course thread and 1/4"-28 is the standard fine thread. The 1/4"-32 would be a special size in a tap or in a Helicoil. I do have one, I cannot remember where I got it but it was at a hobby shop or from Tower?

Send the head to C.F.Lee. His address is in the back of RCM. I don't have one in front of me right now. Perhaps someone else can chime in here and give us Clarence's address? He caharges about $8.

Jim

stripped glow plug threads
 

I would fill the plug hole with aluminum welding rod, then drill and tap it.

stripped glow plug threads
 

Well, try as I might, I haven't been able to find the 1/4"x32 heli-coil. I'm sure they make one. My best bet is to just send it to Clarence. A lot less hassle. Thanks for everyone's help. Matt