stuck valves

[amsterdam]

i have a 8n tractor that has old valves in engine, in a cold start it’s slow , once the engine warms up it runs ok, what can i putin the engine for stuck valves?

 

[old]

i have a 8n tractor that has old valves in engine, in a cold start it’s slow , once the engine warms up it runs ok, what can i putin the engine for stuck valves?

Mix 1 quart of ATF in 3 gal of gas and run it on that mix. ATF cleans up carbon etc. in an engine. You could also add ATF to each cylinder and let it sit a day or 2 that way then pull the plugs and spin it over to clear out the ATF and then run it.

 

[amsterdam]

Mix 1 quart of ATF in 3 gal of gas and run it on that mix. ATF cleans up carbon etc. in an engine. You could also add ATF to each cylinder and let it sit a day or 2 that way then pull the plugs and spin it over to clear out the ATF and then run it.

i will try that, do you put straight atf oil into the cylinders no mixing?

 

[a49deere]

i have a 8n tractor that has old valves in engine, in a cold start it’s slow , once the engine warms up it runs ok, what can i putin the engine for stuck valves?

What does "it's slow" mean? What weight oil is in tractor? Stuck valves are going to cause more symptoms that "it's slow"

 

[Watthour]

If the engine starts and runs until "once the engine warms up it runs ok" the valve(s) are not really stuck, per se, but possibly sticking.

Two-cycle oil added to the fuel can help prevent that to some extent, but if they are sticking due to float or carbon accumulation, changing oil on a shorter schedule might be prudent. If the valve springs are weakened, as old ones often are, the solution becomes different.

BTW, THIS is a stuck valve - Not running, and not closed:

 

[Watthour]

If a valve becomes truly stuck, bigger problems can occur. This one had the rocker removed, which was pretty easy at the time, being in two pieces: