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Chris (aka-Moose)
Chris (aka-Moose), Technician
Category: Car
Satisfied Customers: 1044
Experience:  16 years of experience
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I have a case 446 tractor with a 18 hp onan engine with it

Customer Question

I have a case 446 tractor with a 18 hp onan engine with it running ruff and backfiring and the right cylinder exhaust glowing red just after a couple minutes of running it, I cleaned the carburetor and tried to adjust it, I also changed the spark plugs.
Submitted: 8 months ago.
Category: Car
Expert:  thomas hill replied 8 months ago.

does it have dual carbs or just one carb

Customer: replied 8 months ago.
one
Expert:  thomas hill replied 8 months ago.

does the right cylinder have spark

Customer: replied 8 months ago.
Customer: replied 8 months ago.
it runs best at mid rpm
Expert:  thomas hill replied 8 months ago.

i would run a compression test on the right cylinder i think you have a exhaust valve getting stuck open a bit thats why its popping. The compressed fuel and air is leaking passed the valve and burning in the exhaust thats why its glowing red and the left side is running fine i would look in to that

Customer: replied 8 months ago.
well these engines spark pugs fire on the exhaust stroke to, it started running ruff after it sat for about 3 years
Expert:  thomas hill replied 8 months ago.

well if you have spark and fuel then i would do a compression test that would tell us a lot about whats going on with the engine

Customer: replied 8 months ago.
ok, thanks
Expert:  thomas hill replied 8 months ago.

ok let me know what you find

Expert:  thomas hill replied 8 months ago.

if my answer has helped you please help me by rating or accepting my answer. this does not cost you any more it just allows me to be credited for my work. you can always ask follow up questions after rating or accepting. thank you