Threads in Head Stripped

[rcwilbur]

Oops! While trying to get the seal between the glow plug and the cylinder head tight (air was escaping from around the plug) I stripped the threads in the cylinder head. The engine is an older O.S. 40 FS Series 4 cycle. Anyone know if there is a way to fix it?

[robert harik]

Helicoil set , you can buy them in various sizes. You drill out the hole with the right size bit, tap it and then screw in the helicoil( new threads). I have used them many times and they work well.

[rcwilbur]

Thanks Robert, I'll poke around and see who carries them. I've heard of them for autos, but didn't know they had them for RC engines.

[hoppy]

Helicoil set , you can buy them in various sizes. You drill out the hole with the right size bit, tap it and then screw in the helicoil( new threads). I have used them many times and they work well.

If used on a fixed wing plane would they be aerocoils?

Helicoil - http://www.emhart.com/products/helicoil.html

[pmackenzie]

By the time you buy the special sized drill and tap, helicoil and insertion tool, it might have been cheaper to buy a new head:
http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXCK29&P=7
I have seen adds for places that do the head repair, just can't recall where.
Pat MacKenzie

[SamD]

Clarence Lee, engine columnist at RCM, does this repair; seems to me he was charging about $15 for the fix.

[hoppy]

http://www.rcignitions.com/

[rcwilbur]

Thanks all, I appreciate the advice. Happy landings!