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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › Permatex to seal the backplate
01-03-2014 07:12 PM  4 years agoPost 21
LarsL

rrNovice

Naperville, Illinois - U.S.A.

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Besides tracing, another way to make the paper gasket that my father taught me years ago is to place the cardstock on the back end of the case and tap around the perimeter edges with a small wooden or plastic mallet. I've done this many times and the sharp edges of the casting will just about completely cut out the entire new gasket from the cardstock. What doesn't cut through will be partially cut and well marked so that you can finish the cut with one of your #11 hobby knives.

As I say, I have done this a number of times before on different engines that were older and no gasket available anymore. Since the engine you are talking about is the size it is, you could even use the plastic end of something like a screwdriver to tap around the perimeter. Give it a firm rap as you won't hurt the casting. Don't use a metal hammer or object.

Lars

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01-04-2014 05:07 AM  4 years agoPost 22
Zaneman007

rrElite Veteran

Texas - USA

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If your leaking fuel from every gasket, you may want to figure out the cause.

Gooping the motor up with permatex is not a good idea. It will get in the engine.

When I first started out in this hobby, one of the guys highly recommended the stuff. Why.... Because of the same reasons that you stated. It turns out the cause was the permatex.

An engine that is properly installed should not leak fuel out of the gaskets.

Old Guys Rule!

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01-04-2014 05:13 AM  4 years agoPost 23
marked23

rrKey Veteran

Lynnwood, WA

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Yeah, I have been reconsidering the permatex. It's already installed, but I'm thinking about making one of those magazine-card-paper gaskets and giving that a try instead.

I have a spare casting I can use to do the tracing.

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01-08-2014 04:53 AM  4 years agoPost 24
bustedmp

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Shamokin, PA

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All my years as a mechanic, I have learned a few things about RTV sealants. 1; they are to be used sparingly and only where needed, 2; a proper gasket is always better unless the surfaces require RTV, 3 and most important; I absolutely hate using the stuff. If the sealing surfaces are flat and in good condition, a proper gasket will work every time. Paper gaskets are designed to soak up a certain amount of oil/fuel/liquid in order to swell the fibers to help seal the mating surfaces. Another problem with RTV is people use it to seal large gaps or irregular surfaces, and that is the worst place to use it. The thicker the stuff is when it sets, the more likely it is to work out from between the surfaces it is supposed to be sealing. RTV should only be used in a very thin film to fill minute surface imperfections. The main problem I could see for you using RTV on your back plate would be future disassembly trouble. The backplates fit fairly close inside the engines, and you are adding the equivalent of glue between that close fit. If it were me, I would make a new gasket and be done with it.

The world is yours!

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01-08-2014 04:16 PM  4 years agoPost 25
marked23

rrKey Veteran

Lynnwood, WA

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Good points everybody. I have seen the light... and an Oprah subscription card I found in my wife's stack of magazines.

Hmm.. maybe I should use a Playboy subscription card instead.

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01-08-2014 04:27 PM  4 years agoPost 26
BeltFedBrowning

rrKey Veteran

Kansas City

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...

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01-08-2014 07:21 PM  4 years agoPost 27
MartyH

rrProfessor

USA

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Form-a-gasket #2 (soft) will work well. You degrease the mating surfaces and apply a very light coat on each. It is not silicone based so it will not harm the glowplug. However, my first choice is to use the OEM gasket and no sealant.

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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › Permatex to seal the backplate
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