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HelicopterMain Discussion › Oil leak problem
01-05-2013 08:26 PM  5 years agoPost 1
chikoseye

rrNovice

Springfield Gardens NY

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Hi everyone! I had these problem with my trex 700 with os91 engine and hatori pipe, I don't know how to manage the oil leak coming from the engine to the pipe, i changed already the gasket with a new one, tightened the screws, but the leak keeps coming. Anyone had the same issue? What can i do to fix it? Love the nitro's but this leak is to nasty to clean up.

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01-05-2013 08:40 PM  5 years agoPost 2
Dood

rrProfessor

Wescanson

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Tighten the screws while the engine and muffler are HOT!
Just fly around for a few minutes, land, and tighten everything up right away.

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01-05-2013 09:59 PM  5 years agoPost 3
TREXSYNDROME

rrVeteran

Lakeland, Florida-USA

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Use a felt gasket...u can make your own.

Mark
Trex 700 n
Gaui X5
Vbar 5.3 pro

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01-05-2013 10:09 PM  5 years agoPost 4
TMoore

rrMaster

Cookeville, TN

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I'm pretty sure a gasket won't hold up and it won't allow the heat transfer to the pipe that is necessary for good running. I would find a thick piece of glass to use a master tape a piece of 360 paper to the glass and drag the pipe across the glass with the pipe face blackened up with a black magic marker and see how flat the pipe face is and then once the pipe flange is trued up try that.

TM

Delayed Response Operator Not Engaged
AMA SECTION 336 = Good
Drones = EVIL

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01-05-2013 11:06 PM  5 years agoPost 5
ticedoff8

rrKey Veteran

Morgan Hill, CA. USA

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Is this a leak between the engine exhaust flange and the Hatori header?
Or, is this a leak between the Hatori header and the pipe?

The header to pipe uses an orange O-ring made out of a high temp silicone like material.

There is no engine flange to headed gasket included with the engine or the pipe.

Are you saying you have replaced the O-ring?

And, how sure are you it is not the engine flange to header that is leaking?

Tightening the screws that holds the pipe to the header isn't going to help.
1) The O-ring does not require those 4 screws to be tight to form a seal. It seals as soon as the header is inserted into the pipe-flange.
2) Each of the 4 screws has the washer / spacer sleeve that keeps you from crushing the 4 silicone vibration damper inserts. If you try to over-tighten the screws, you crush the sleeve and/or strip the screw holes in the header.

If the engine flange to header is leaking, I use a 2 part thermal epoxy to seal between them. You mix up a small batch and smear it where the two parts mate and in 15 min, yo are ready to fly. And, it isn't permanent, so it is easy to clean off the flange & header if you have to take it all apart.

If the leak is between header & the pipe, then it has to be the O-ring. Look for deep scratches or debris on the header where the O-ring groove is located or inside the pipe-flange where the O-ring is suppose to seal.

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01-06-2013 12:49 AM  5 years agoPost 6
TREXSYNDROME

rrVeteran

Lakeland, Florida-USA

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I have been using felt gaskets for years and they perform great

Mark
Trex 700 n
Gaui X5
Vbar 5.3 pro

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01-06-2013 01:53 AM  5 years agoPost 7
BladeScrape

rrApprentice

Warren OH. US

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I have been putting a very light bead of 5 min epoxy around the engine exhaust before you put on the muffler . I learned that trick about 5 yrs ago. It's ok to get a little on the threads as well. I haven't had one leak or come loose for 5 yrs now.

Team JR

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01-06-2013 02:53 AM  5 years agoPost 8
chikoseye

rrNovice

Springfield Gardens NY

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the leak is between the header and the engine exhaust, yes there is no gasket included when i bought it. Then I noticed a leak so i put an align gasket to it, I tried tightening the screws after a run while the engine is hot but it doesnt work. there is still leak.

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01-06-2013 05:57 AM  5 years agoPost 9
TMoore

rrMaster

Cookeville, TN

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Take the flange apart from the muffler and sand it like I mentioned earlier and check the orings in the adapter.

TM

Delayed Response Operator Not Engaged
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Drones = EVIL

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01-06-2013 07:49 AM  5 years agoPost 10
helixangle

rrKey Veteran

Mamaroneck, NY - USA

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+1 on glass and sand paper, additionally when it comes time to replace bearings use procedure on block as well (or if your board and have nothing to do.

I use high temp rubber impregnated felt gasket sheet you can get at any auto parts store, at the hobby shop pick up some thin poly sheet (white) and a paint pen, coat your block exhaust port with the pen, press the sheet against the block while the paint is still wet thus showing you the impression of the exhaust port, when the paint dries on the sheet carefully cut out impression and now you have an exhaust gasket template you can use to duplicate on the gasket sheet as many times as you need -- works like a charm

Be sure the juice is worth the sqweeze
Remember life is hard...even harder for stupid people

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01-06-2013 08:20 AM  5 years agoPost 11
nitro fun

rrApprentice

Oc ca

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Clean engine flange with carb cleaner. Use permatex ultra copper silicone thin layer with your finger . Let dry over night and you will never see a leak!!

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01-06-2013 08:33 AM  5 years agoPost 12
darren heaver

rrApprentice

rochester, kent, england.

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Sealing exhaust
I have always tried to do a metal to metal joint without sealer with no joy it always leaks eventually. I have had good results with copper gaskets and then retighten once hot and no leaks or I was told to try 30 min expoxy in a very thin layer which I did not like to do as could be messy but must admit it does seem to work well with no leaks to date about 3 months use

Darren.

" one day I will learn to fly till then I will just hover"

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01-06-2013 11:59 AM  5 years agoPost 13
TREXSYNDROME

rrVeteran

Lakeland, Florida-USA

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align gaskets are no good, make your own with real gasket material

Mark
Trex 700 n
Gaui X5
Vbar 5.3 pro

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01-06-2013 01:31 PM  5 years agoPost 14
Jeff polisena

rrElite Veteran

westpalmbeachflorida usa

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Put header on flat surface and make sure it's not warped ,I never have used gasket because it warps as gasket get flat at bolt holes . I use small amount of epoxy and for a couple of flights I make sure bolts are tight . O rings can be replaced if leaking from pipe/header fitting.

I stole it ,flew it and gave it back ;)

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01-06-2013 08:48 PM  5 years agoPost 15
highrpm

rrApprentice

Shelby Twp,Mi

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Fwiw I use the red high temp rtv with no leaks. Spread it super thin with my finger. I think it was on a smack talk episode

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01-06-2013 11:12 PM  5 years agoPost 16
fla heli boy

rrKey Veteran

cape coral, florida

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I always trued the pipe as above, cut a thin aluminum gasket and used a thin layer of Perma-Tex Hi-Temp copper exhaust silicone on all three pieces (note I said THIN). Never had a leak.

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01-07-2013 12:17 AM  5 years agoPost 17
ebonicrobot

rrApprentice

East Bay, CA

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I've always used 5 min epoxy with great success.

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01-07-2013 02:06 AM  5 years agoPost 18
RCHSF

rrKey Veteran

NC

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I'll third or forth the sanding of the flange. Then apply the other methods to that. If all else fails use a 10# Hammer.

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01-07-2013 08:43 AM  5 years agoPost 19
chikoseye

rrNovice

Springfield Gardens NY

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thanks for the ideas,. sure i'll try every single one of them until my problem is solve.

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01-07-2013 10:24 AM  5 years agoPost 20
HeliSmith

rrVeteran

Chico, CA

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If you put the header plate on backwards it will leak like you described. Make sure it is on the correct direction not 180°

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HelicopterMain Discussion › Oil leak problem
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