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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › Engine leak????
01-16-2009 04:02 PM  9 years agoPost 1
Ghostrider

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San Diego, CA

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My Align H motor during flight starts sounding like I lost a muffler. Loud ting, ting, ting....like my pipe fell off.

Well, the pipe is fine and so is the header (I tried a different pipe and header, that's not it). So I pull the motor and the head bolts are tight, carb is tight and no sign of a crack or anything.

I cleaned the motor and re-installed it thinking I could see the leak but I cant tell where it's coming from with the motor installed and running.

Any tricks of the trade on how to find where the leak is coming from?

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01-16-2009 04:09 PM  9 years agoPost 2
RaptorMan23

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Sioux City, IA

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notice any loss of power? Thats kind of odd

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01-16-2009 04:10 PM  9 years agoPost 3
MaxAdventure

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Northern CO

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did you pull the back plate and look at the bottom end? might not be an exhaust leak....

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01-16-2009 04:13 PM  9 years agoPost 4
Santiago P

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South West, Ohio

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Mix dish soap and water, put it on a spray bottle, turn the engine with the starter only and spray your mix one area at the time. Look for bubbles.

If you dont find anything, then start the engine and spray and watch for bubbles again.

Are you sure the noise is not comming fron the rear bearing going bad? I heard the wierdest sounds come from then.

One time I could swear I heard one of my Beatles albums played backwards from a hyper with a bad bearing! Just joking on the last one, it was actually Pink Floyd.

Team Minicopter - PeakAircraft.com
bavarianDEMON- Team Kontronik - Scorpion Motors-

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01-16-2009 04:14 PM  9 years agoPost 5
RaptorMan23

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Sioux City, IA

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Max is probibly right, Im kinda thinkin you lost a bearing. Might want to pull them out and check em

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01-16-2009 04:41 PM  9 years agoPost 6
GREYEAGLE

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Flat Land's

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Check yer baffel
Sounds like your baffel may have come loose within the pipe, some are a loose press fit , others spot welded, some pipes may not have any but most do. I even had a pipe one time that was two piece on the out side and three pieces on the inside.

Pull it and shake it, or tap it with a small dowel with it off and listen for a tinny ring. See if you can get light thru it as if its a open style like a tuned pipe, but even a few of those have a seperate wall in them.

Somes times if it has enough hours on it, you can actually see a ring of discolored material on the out side if the internals have been fretting for a while.

Far as a remidy : Fly it, and say it's got personality, or wait till it really drives you nut's, or wait till the component fails and replace it.

greyeagle

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01-16-2009 05:01 PM  9 years agoPost 7
Dr.Ben

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Richmond, VA, USA

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First 3 things to check after ruling out the muffler:

1. Rear bearing.

2. Rear bearing

3. Rear bearing

It makes no difference if the bearing "feels" smooth when you turn over the engine.

Ben Minor

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01-16-2009 05:31 PM  9 years agoPost 8
Ghostrider

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San Diego, CA

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Check yer baffel

Sounds like your baffel may have come loose within the pipe, some are a loose press fit , others spot welded, some pipes may not have any but most do. I even had a pipe one time that was two piece on the out side and three pieces on the inside.
Replaced pipe and header, it's not that.
First 3 things to check after ruling out the muffler:

1. Rear bearing.

2. Rear bearing

3. Rear bearing

It makes no difference if the bearing "feels" smooth when you turn over the engine.
The problem is that even on the bench in idle, the motor is leaking fuel and it sounds like I have no pipe installed on the motor. Yamaha two-stroke sounding if you will. How can it be the rear bearing if it's dripping fuel on the bench?

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01-17-2009 06:56 AM  9 years agoPost 9
RaptorMan23

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Sioux City, IA

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Where is it leaking fuel from?

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01-17-2009 12:27 PM  9 years agoPost 10
Ghostrider

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San Diego, CA

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Where is it leaking fuel from?
If I knew that, we would not be having this conversation.

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01-17-2009 02:16 PM  9 years agoPost 11
2LTime

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Walworth,NY

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I think we're kind of confused. Leak......noise. What does one have to do with the other. Are you trying to fix a leak or a noise. Or, does it only make a noise when it leaks? Is it leaking raw fuel or more like oil?

Jeff

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

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01-17-2009 03:41 PM  9 years agoPost 12
Ghostrider

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San Diego, CA

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I think we're kind of confused. Leak......noise. What does one have to do with the other. Are you trying to fix a leak or a noise. Or, does it only make a noise when it leaks? Is it leaking raw fuel or more like oil?
If I start the motor on the bench, it leaks raw fuel and sounds like a yamaha 2-stroke engine. I am assuming that the "noise" is because something is cracked like the case/head, but I cant find the crack.

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01-17-2009 04:23 PM  9 years agoPost 13
baddynergy

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sierra madre, ca- usa

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Sam, not sure if this works on glow engines. But if you spray starting fluid around the areas of suspect, the engine RPM should increase when you hit the leak.

Just dont spray a lot, a little goes along way. I hope this helps you..

**Unattended children will be givin a shot of espresso and a puppy**

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01-18-2009 06:01 AM  9 years agoPost 14
Ghostrider

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San Diego, CA

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OK, I feel pretty stupid telling you guys this, but here is what happened.

When I pulled the motor the first time trying to find where all the fuel was leaking from, I also pulled the header and pipe and replaced it with another one I had thinking the header or pipe may be the problem.

Well I replaced the header and pipe, re-installed the motor and nothing changed. Still sounded like a Yamaha 2-stroke and still was dripping fuel.

I then went back to the drawing board and started trying the different suggestions posted. I still got nothing.

Well I said screw it, I want to fly tomorrow and I have another motor sitting here.....

When I pulled the motor, I also pulled the header and pipe. Here is where everything got messed up.

When I put the new header on the motor the first time around, I also installed the new Hatori press nuts into the header. Well one of the nuts was not a press nut but a lock nut that I installed by mistake. The lock nut is almost twice as thick as the press nuts which was pressing against the case and not allowing a good seat against the motor, hence the leak.

Everything is good now. I know you guys are laughing your ass's off but I wanted to let you guys know what happened. Thanks for all the help and suggestions!

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01-18-2009 07:52 AM  9 years agoPost 15
Futura SE

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Fayetteville, Arkansas

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Go ahead and kick yourself so we don't have to We all make mistakes we just aren't brave/stupid, I mean brave enough to ask for help

Glad you got it fixed,

Norman Ross Jr.

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01-18-2009 03:09 PM  9 years agoPost 16
RaptorMan23

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Sioux City, IA

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Hey it least it didnt cost anything

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01-18-2009 06:39 PM  9 years agoPost 17
MaxAdventure

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Northern CO

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Hey it least it didnt cost anything
exactly!!! the best fixes are the ones where nothings broken, no losses, no cost!!! (you can get your pride back for free...)

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01-18-2009 08:45 PM  9 years agoPost 18
Santiago P

rrProfessor

South West, Ohio

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the best fixes are the ones where nothings broken, no losses, no cost!
We are are guilty of doing mistakes like that once in while, and with all our experince, cant figure out what is going wrong. I remember one I did a few years ago that took me over a month to figure out. all my fault

Team Minicopter - PeakAircraft.com
bavarianDEMON- Team Kontronik - Scorpion Motors-

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