warhwk

My Feedback: (3)

Second flight with a used (Ebay) Magnum two-stroke 91. Engine lost power then dead sticked. Back on the bench I noticed the glow plug was pointing a bit off-center. I took the glow plug off, but could not find any issue with it. When I tried to start the engine on the bench, the glow plug ignitor shot off with the glow plug still attached.
When I looked closer, the glow plug thread insert had come out of the head!!

I first thought it was a defective heli-coil repair, but I could see the insert is press fit into the head and is shaped like a Torx socket. It may have been spot welded as well.
I don't have anything to lose by trying JB weld, but I don't want anyone standing next to the engine when it is started.

Has anyone seen something similar?

Sport_Pilot

Yes cracked carb collar, broken idle needle valve. Both broke very easily and both on Magnum engines. Poor CQ on metal process.

jeffie8696

Magnum is not my favorite. I have had more problems with them than any other brand. Not that I havent had troubles with other name brand engines like my OS52Surpass that refuses to run right . A new cyl head should be in the works as JB weld breaks down at high temps.

warhwk

My Feedback: (3)

I have already ordered a replacement head. Even if a JB weld repair worked initially, I am concerned about having a "loaded" weapon on the flight line. LOL!

Question more out of curiosity....what are the nominal head temps on a glow engine? I would guess somewhere between 250 and 300?