glow plug failure! 2 in 2 days whats the cause?

[Supercaptaincrash]

i went out yesterday and put a couple of tanks through my 600 when at the end of the flight the engine suddenly stopped around 30ft up!luckily did a tidyish auto and landed with no damage!inspected the heli to find the plug had failed about half way down the coil!just been out today and another has failed,luckily right side up from being inverted seconds earlier! is there anything particular i should be looking at and what can cause plug failure?

[sacko]

Most likely running the engine lean.

[Supercaptaincrash]

cheers paul i did lean the engine out 1 click before yesterdays flight as i felt it could do with it! think ill take it back a couple of clicks now! thanks for the reply paul! what causes the plug to fail when lean? to much heat?

[coptermanic]

Yes, burns too hot and destroys the integrity of the coil.

[Tim Procter]

I bought a card of Enya No3 plugs some time back.

Must have had a fault with them because they all failed within quick time.

Put an OS8 plug in the same heli and it ran for weeks and weeks.

[Supercaptaincrash]

is there any other causes or is running lean the main culprit? thanks for the replys

[jeznewsome]

when did you last change the engine bearing? I had a load fo problems with going through bearings when mine were tired. Changed them and then no further problems.....

[waveydavey]

I also had similar problems with my OS 50. I had just rebuilt but had used silicon type sealant on the pipe, little bits of silicon where getting blown into the engine and lodging in the coils. Causing what looked like plug failure but was just sapping the heat from it.

[Supercaptaincrash]

when did you last change the engine bearing? I had a load fo problems with going through bearings when mine were tired. Changed them and then no further problems.....

to be honest ive not changed the rear bearing since ive had the heli!

[jamiem]

If the coil is partially missing, my money is on a failing rear bearing. When it's wearing badly, it can start to break up and fire small piece's of bearing through the engine, straight at the glow plug. Normally if its a lean run, the coil will just be broken away at top and very white in appearance.

[Supercaptaincrash]

looks like im replacing the bearing then! the plugs were not white in appearance and looked ok apart from the damaged coil! can anyone give me a link to where you buy your bearings please?

[zoombolt]

Longest lasting bearings I've ever had. Great price too,

RC-Bearings.com

Takes about a week & half to get to your door.

[Birdie4x4]

RC-Bearings.com
They dont take long to arrive and good price.

Too late again!

[zoombolt]

RC-Bearings.com
They dont take long to arrive and good price.

Too late again!

Jinx.

[Supercaptaincrash]

Thanks for the links! can anyone give me a link to a idiot proof how to of bearing removal as ive never done it!