Ford 640 gassy exhaust

grandpa Love

Well-known Member
We ran tractor about 3 hours before Christmas pulling a hay ride , exhaust was normal. Have run it a little bit at least once a week for 15-20 minutes each time. Tried to run it today and the exhaust is terrible, blueish smoke that smell very gassy. But it runs fine. Blows smoke every time I give it throttle. Maybe just needs a carb tweek? Ran it about 15 mins and eyes watering so bad I gave up. Any thoughts? Thanks
 
I just scrape them off with dental pick, pocket knive, etc. I dont have a plug sand blaster although one would be nice. My #4 fouls on a regular basis and I notice more smoke when it does.
 

What do you do with it during those 15-20 minutes? You know that short trip driving is severe duty, right?
 
sounds like it is running rich. Too high of a float bowl? Needs to be adjusted..
needle jet sticking open? More than likely it is carb related. My 3000 is doing the exact thing. I plan on ordering a new carb for it next week and be done with it.
I don't really want to rebuild it at this point.
 
Well......sorta just drove it
around. Always try to let it run
long enough to get nice and warm.
Maybe not best idea?
 
I think you are better off to let them sit verses running to "warm up", it probably takes an hour of good hard work to get the condensation out.

Pull the battery in the fall, take it inside, put back in the spring.
 
A rich fuel mixture would normally produce black smoke,
but I'd try leaning it a bit anyways.
If it is blue/oil smoke, work the snot out of it and it may clear.
A little ATF or MMO in the gas while working it may help.
 
greymond, if you decide to replace your carb and trash the old one,
I would be happy to pay the shipping for your old one.
 
Lucky for the old Ford I got a job
lined up late week to work it good
a few hours. We will see what
happens.
 

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.

Back
Top