Please help...3W140 running problems.
#1
Thread Starter
Please help...3W140 running problems.
My flying buddy is having problems with his 3W140 and having no internet access at the moment has asked me to seek help on his behalf.
The 3W140 is in a Godfrey 300L turning a 30x10 prop on 40:1 fuel and has developed this problem.
It used to turn 6100 on the groung routinely, but now suddenly, it only go from idle to about 2/3 of full throttle ( 5400) if throttle is advanced slowly. Any attempt to advance the throttle further results in a shutdown. However, if the engine is quickly throttled back it will continue to run.
Here is a list of things we have checked so far.
1 Stripped and cleaned carb....nothing found wrong and no change.
2 Opened HS needle from 2 1/4 to 3 turns...no change.
3 Checked ignition module on a 3W120...works perfect
4 Checked magnet sensor on 3W120...works perfect
5 Checked all fuel lines and plumbing..everything found ok
6 Changed voltage regulator (6v to 4.8v)...no change
7 Removed cylinders and cleaned a thin film of carbon from pistons and cyl. head
8 Checked for sticking or broken rings....all ok
9 Checked that butterfly is opening fully
The engine has very good compression, starts easily and will idle down to 1600. Please help as we are at your wits end here.
The 3W140 is in a Godfrey 300L turning a 30x10 prop on 40:1 fuel and has developed this problem.
It used to turn 6100 on the groung routinely, but now suddenly, it only go from idle to about 2/3 of full throttle ( 5400) if throttle is advanced slowly. Any attempt to advance the throttle further results in a shutdown. However, if the engine is quickly throttled back it will continue to run.
Here is a list of things we have checked so far.
1 Stripped and cleaned carb....nothing found wrong and no change.
2 Opened HS needle from 2 1/4 to 3 turns...no change.
3 Checked ignition module on a 3W120...works perfect
4 Checked magnet sensor on 3W120...works perfect
5 Checked all fuel lines and plumbing..everything found ok
6 Changed voltage regulator (6v to 4.8v)...no change
7 Removed cylinders and cleaned a thin film of carbon from pistons and cyl. head
8 Checked for sticking or broken rings....all ok
9 Checked that butterfly is opening fully
The engine has very good compression, starts easily and will idle down to 1600. Please help as we are at your wits end here.
#3
Thread Starter
RE: Please help...3W140 running problems.
After dismantling the carb again to check on the condition of the diaphragm which is okay, we just happened to notice that the spacer block between the carb and the engine is severely warped. We plan on using high temp Red silicone as a sealer between the mating surfaces and see if that solves the problem.
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RE: Please help...3W140 running problems.
You might actually have a kinked or restricted fuel line. I've experienced this a couple of times, and the carburetor will actually pull gas through a kinked line up to full power, at which point the engine starves for gas and shuts off. Fuel line can kink, and it not be clearly evident without a really close look.
Hope this helps.
Hope this helps.
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3W140
Wasn't this problem figured out on the [SA] list? It was a warped phenolic block. Kris, do you know of anyone that converts the DA bloc kto fit the 3W? I have a 140 and a DA block but don't have the experience to tackle it. Thanks_bob
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RE: 3W140
HAHAHAHH. . FUNNY you should ask. . . . . . .
I did it to my new-style 3W150 about 15 months ago, and the engine has run perfectly ever since. .I EVEN took pics of the process. . .
Maybe I should do a "how to" on it
I did it to my new-style 3W150 about 15 months ago, and the engine has run perfectly ever since. .I EVEN took pics of the process. . .
Maybe I should do a "how to" on it