RPMs go up and down

Svenn

New User
Hi

I've just bought a TE20 (1953). The motor is varying quite a bit, going up and down in rpms.

I have checked the spark plugs, they are all quite new and fine. I have also tried fiddling with the adjustment screws on the zenith carburator.

Thanks in advance
Svenn
 
Can't be a TE20 (Continental engine) if it was built in 1953. I suspect a TEA20 with Standard engine?

If it is "hunting" your problem is the governor. You will need a service manual to set up and adjust the governor.

Bob in Oz
'53 TEA20
 
Hi Bob,

Actually I'm still not sure what it is. The seller said TE-20 and 1953, but I haven't been able to locate any serial numbers to verify.

I have a service manual in my own language, so I'm not really sure how to translate govornos. Is the govornor some adjustment screw on the carburetor?

Thanks!
 
when adjusting the screw on the carb did you notice a change in how the engine ran. there is a good chance that your carb has some dirt in it. if it were me I would take the carb off and clean it and maybe even rebuild it before adjusting the governor. unless you know someone has already messed with the governor. you will be farther ahead to start with the carb at least than you know its not the problem after cleaning it.
 
The governor is the mechanical device that regulates the engine speed. It is located behind the front engine cover and is connected to the carb with a linkage. There are spinning weights inside, the faster the engine turns, the harder the weights pull against the throttle spring, and keep the engine at the proper speed.

The engine speed going up and down is probably not a governor problem. It is usually caused by lean mixture. Try partially pulling the choke, see if it levels out. If it does, look for vacuum leaks, try enriching the mixture.
 
Hi Steve

Pulling the choke does make it stop. Where should I look for vacuum leeks? There is a pipe going to the top of the air filter that does have a mild suction.

Btw. I think its a standard version and not continental.

Thanks
 
Vacuum leaks can occur around the gasket between the manifold and the head, around the carb to manifold gasket, and around the throttle plate shaft if severely worn.

Get an aerosol can of spray carb cleaner, the flammable kind. With the engine idling, spray it around the gasket areas, listen for the RPM to change. That's where the leak will be.

Remember, the problem can also be a lean mixture. If the idle mixture screw (the small adjustment screw with a spring behind it) doesn't change the idle quality when adjusted, the idle circuit inside the carb may be clogged.
 
Svenn.

I'm guessing you are Scandinavian?

Motor governor = Motor guvernør; Motor governor; Motor gouverneur; Gouverneur de moteur; moottorin kuvernööri; Motorregler.

I hope one of those helps?

If it is a TEA20 with Standard engine, it will have this engine:



The Tractor Serial Number is here:



And the Serial Number should include the letter "[b:f2a3e85a11]A[/b:f2a3e85a11]": TE[b:f2a3e85a11]A[/b:f2a3e85a11]

The date of manufacture is here:



"[b:f2a3e85a11]6 7 3[/b:f2a3e85a11]" = 6 July 1953.

If the engine is "hunting" the problem is probably governor adjustment.

If pulling the choke makes it stop I don't think you have a vacuum air leak or gasket air leak.

Bob in Oz
1953 TEA20

P.S. I see from your IP address you are in Denmark.
 
Hi

Thank you for all your input.
I have tried cleaning the carb (blowing lots of air through it). It seems like the bottom and top is glued together, perhaps some kind of rubber gasket? Anyway, I couldn"t really separate the top and bottom.

When it was off I noticed that there was missing a link between choke and gas. An upright little connection that is mounted to the gas (lever, damper, flap - not sure what its called) and is running inside a small pipe on the choker (lever, damper, flap). Not really sure what it does - actually it doesn"t seem to do much. Maybe prevent totally idle gas when full choke is on... you guys probably know this. I mounted the missing linkage (from a spare carb) and mounted the carb on the tractor again. At first it seemed like the "hunting" was still there. So we started turning the ignition coil. Not much changing really (surprisingly). But I got a little better, and after also tuning some of the options on the carb I think its got a lot better.

As for the serial, the little plate on the dashboard is missing. I was looking for numbers behind the dynamo/generator - but it almost not readable. I also found some numbers behind the carb. I wrote it down, but I don"t have it here.

I just stumpled upon this video from norway. My fergie sounds more or less exactly like this one: http://www.youtube.com/watch?v=9MgdzKMKSQs#t=70 - is this "hunting"?

Thanks!
 
Hi

For some reason my post ended up a little higher than I have hoped.

Is this "hunting" http://www.youtube.com/watch?v=9MgdzKMKSQs#t=70 ?

Thanks
 
Svenn, it certainly sounds like that TEA20 in the Youtube clip is "hunting".

I would be looking at the governor.

Bob in Oz
'53 TEA20
 
Hi Bob

All I can do with the governor is change the length of it right?
Should either a shorter or longer governor fix the hunting?

Thanks!
 
After getting my hands on a service manual, I come do discover that there is a little more to it...

Thanks again!
 

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