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HelicopterEngines Plugs Mufflers Fuel › ruined thread in glowplug hole(head)
12-01-2007 04:36 PM  9 years agoPost 1
Maxime

rrApprentice

Belgium

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Hi,

I managed to ruin my thread of the glowplug hole on my os50 hyper

is there any way I can fix it?
does there exist a Helicoil for this size?

what size thread is it? it's not metric is it?

thanks a lot,
hope you guys can help me

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12-01-2007 04:39 PM  9 years agoPost 2
2LTime

rrKey Veteran

Walworth,NY

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http://runryder.com/helicopter/t386355p1/

If you can't learn to do it well, learn to enjoy doing it badly.

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12-01-2007 04:49 PM  9 years agoPost 3
z11355

rrMaster

New England

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here's a tip......

take a piece of fuel tubing, maybe 5-10cm and push the tip
of the glow plug onto it. now, using that as flexible wrench, use
it to insert the glow plug into the engine and start turning.

you'll get a turn or 2 before the tubing start slipping which assures
you that you're not cross-threading

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12-01-2007 04:52 PM  9 years agoPost 4
Raffy

rrElite Veteran

Chicago, Illinois

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Your best fix is to send it out for repair to your local hobby shop to be sent out for OS repair.

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12-01-2007 07:37 PM  9 years agoPost 5
2LTime

rrKey Veteran

Walworth,NY

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Raffy, Has OS fixed a stripped head for you? I would assume their solution would be to remove the six screws and just replace the head. That's probably not cheap.

Jeff

If you can't learn to do it well, learn to enjoy doing it badly.

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12-01-2007 07:54 PM  9 years agoPost 6
Dr.Ben

rrMaster

Richmond, VA, USA

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Look in the back of a Model Aviation for the address for Clarence Lee. He'll install a 1/4-32 helicoil in the head (send the head only)for a modest fee that is well below the cost of a new head and and which will NEVER strip on you again. He turns them around in a week's time.

Ben Minor

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12-01-2007 08:20 PM  9 years agoPost 7
Maxime

rrApprentice

Belgium

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I'd love to do that but since I live in Europe 2 times shipping costs would come to the price of a new head I think.

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12-01-2007 09:02 PM  9 years agoPost 8
captb

rrApprentice

Arizona Desert

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If you can find a tap you could run Nelson Glow plugs (larger thread),
Thread size is 11/32" x 32 tpi.

If it's gonna happen it'll happen up there!

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12-02-2007 05:24 PM  9 years agoPost 9
Dr.Ben

rrMaster

Richmond, VA, USA

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I doubt it, if you can wait on regular airmail. I head is pretty lightweight. I guess it depends on what a new head cost in the EU.

Ben

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12-03-2007 10:48 AM  9 years agoPost 10
wrobijns

rrApprentice

Swalmen, the Netherlands

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I sent you a message on "Modelbouwforum" about this.
I know a guy who can probably fix this for you in the Netherlands.

Walter Robijns, 3D rules !!!

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12-04-2007 12:55 PM  9 years agoPost 11
TRACERBOB

rrVeteran

Closer than you think

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If you didn't totally ruin the threads, run a 1/4-28 tap through it from the combustion side to clean the threads up. If the threads are fubar, it would be cheaper to buy a new head.

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12-04-2007 01:34 PM  9 years agoPost 12
z11355

rrMaster

New England

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it's a 1/4-32 thread, not 28

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