Zenoah G-26 Spontaneously Quits.....
11-16-2015, 09:19 AM
#1
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Zenoah G-26 Spontaneously Quits.....
Hi All,
I have a 5 year old Zenoah G-26 in a Hangar 9 Taylorcraft. This engine runs great, but recently started to quit spontaneously about a minute into each flight. The engine seems to 'sag' momentarily just before quitting, but that's the only indication I seem to get before it simply quits. Once the plane is back on the ground, the engine always starts right back up!
Otherwise the engine runs fine! It has great idle, high end, and transition between the two. I rebuilt the Walbro carburetor about a year ago (general cleaning, and diaphragm replacement), but other than that it's really had nothing done to it.
I'm thinking that it's time for the following:
1. New plug
2. New fuel lines
3. New ignition battery
4. Carb. flush out
Interestingly, the engine will also quit on the ground after about a minute of running at medium throttle, so I plan to keep the model on the ground until this issue is resolved!
The only other thing that I suppose it could be is the ignition module? It's an original unit, and I have no idea how long these things should last?
Thoughts?
John
I have a 5 year old Zenoah G-26 in a Hangar 9 Taylorcraft. This engine runs great, but recently started to quit spontaneously about a minute into each flight. The engine seems to 'sag' momentarily just before quitting, but that's the only indication I seem to get before it simply quits. Once the plane is back on the ground, the engine always starts right back up!
Otherwise the engine runs fine! It has great idle, high end, and transition between the two. I rebuilt the Walbro carburetor about a year ago (general cleaning, and diaphragm replacement), but other than that it's really had nothing done to it.
I'm thinking that it's time for the following:
1. New plug
2. New fuel lines
3. New ignition battery
4. Carb. flush out
Interestingly, the engine will also quit on the ground after about a minute of running at medium throttle, so I plan to keep the model on the ground until this issue is resolved!
The only other thing that I suppose it could be is the ignition module? It's an original unit, and I have no idea how long these things should last?
Thoughts?
John
11-16-2015, 03:48 PM
#2
I had a similar problem once and it turned out I hadn't removed my fuel tank vent storage cap. The fuel pump was actually trying to suck the fuel tank flat!
In your case, I would check the fuel vent, the clunk filter, and the screen in the carb. Note that the screen in the carb can look clean but be clogged with a clear varnish like substance. Also make sure your pump diaphragm is good. I have seen them, especially the rubber ones, become distended from fuel additives. Then they still pump, but at a reduced capacity. While you are poking around with those things, of course also check for fuel line air leaks, kinks, etc.
This is all assuming of course that the carb is set rich enough to begin with. First try opening both the high and low mixture screws 1/8 turn and try another ground run.
AV8TOR
In your case, I would check the fuel vent, the clunk filter, and the screen in the carb. Note that the screen in the carb can look clean but be clogged with a clear varnish like substance. Also make sure your pump diaphragm is good. I have seen them, especially the rubber ones, become distended from fuel additives. Then they still pump, but at a reduced capacity. While you are poking around with those things, of course also check for fuel line air leaks, kinks, etc.
This is all assuming of course that the carb is set rich enough to begin with. First try opening both the high and low mixture screws 1/8 turn and try another ground run.
AV8TOR
Last edited by av8tor1977; 11-16-2015 at 03:57 PM.
11-16-2015, 06:22 PM
#4
ezflyr , I think your right on the money with your list already . After 5 years you need to replumb the tank and lines , clean carb and install a kit , new plug etc.
Nothing out of line there . Perform your list before worrying about replacing the ignition . I'm not saying you won't end up needing an ignition but do the periodic maintenance first.
Nothing out of line there . Perform your list before worrying about replacing the ignition . I'm not saying you won't end up needing an ignition but do the periodic maintenance first.
11-17-2015, 07:10 AM
#6
AV8TOR
