Timing advance and Governors

lastcowboy32

Well-known Member
Now that I've fiddled with everything else on this tractor, I'm looking at how it runs fully loaded.

Why? It just has this feeling like it's holding back at full throttle.

First, timing. My understanding is that, for the 2N with front distributor, the only timing adjustment is done for "static timing," that is, when you do the straight edge to mounting hole measurement and set it to 1/4" when the points are just opening.

The F0-4 manual says that timing should advance at full throttle above 2000rpm.

Since there is nothing in between those two sections in the manual, I'm assuming that the advancement is done by the "advance weights" in the distributor automatically?

So, I'm assuming that there is no adjustment to the advance. It's just something that could possibly be measured to see if the advance weights are working? Right?


Now, governors:

When I throttle the tractor down to idle, the throttle lever on the governor hits a stop and forces the governor lever (the one actually connected to the carb) forward, which forces the tractor down to idle.

At that point, the governor spring goes slack, and moving the throttle a little ways does nothing, until the slack is taken up and the spring starts to pull the governor lever forward. Even when the slack is taken up, the spring stretches a little bit before actually moving the governor lever.

When I go to full throttle (with the tractor sitting still) the governor lever initially goes to full throttle, but then the governor stretches the spring and the rpms diminish. I assume that this SHOULD happen, but when I put the tractor under load, I just get this feeling that the spring isn't pulling the governor lever back to open the throttle back up.

Here is where I wish that I had my brother's old grinder/mixer to connect the tractor to; so that I could hook up the pto and have someone run a few shovels full of corn through so that I could stand and watch the governor's response. All I can do is "feel" it when I climb a hill with the tractor to test the throttle response.

Any hints on how to test this....or should I just buy a new spring and see if it changes?
 
Lastcowboy32,The timing advance weights will sometimes be worn and hang up not advancing the timing.The only way to check the weights is to remove the distributor and take the points plate out and remove the weights and shaft.Check the two little springs and check movement for worn parts and hanging up by moving the weights back and fourth also by twisting the rotor shaft while holding the opposite end,movement should be smooth with no binding.
The governor spring should just be snug at idle position with no free play(important).The arms should have very little side play in the bushings.
If the spring is loose tighten up the slop by squeezing the hook/ends together with a large pair of channel locks over booth loops till you get it snug/no free play in the spring.If it is stretched in the coils it needs to be replaced with a new spring.
Fix your governor first and see if your problem disappears.
 
Yeah,

I fiddled with it some more.

When I move my throttle from idle to full, what happens at first is, nothing as the spring takes up slack. Then, the spring stretches a little bit and my throttle plate still hasn't really moved.

Then, when my throttle lever goes from about 1/3 to 2/3, it seems as if the tension in the stretched spring combines with the throttle lever movement to open the throttle plate all of the way to wide open, at which point the tractor revs momentarily; before the governor stretches the spring back and the throttle plate ends up about half way open.

Both of the levers on the governor also can wiggle side to side quite a bit (as in, toward the engine and toward the generator) if I wiggle them.

I think that I have a tired governor bushing and a tired spring.

Next project.... :)
 
TWO THINGS the N series did not do well.... GOVERNORS & BRAKES... both are 'lazy'... they'd have been better tractors if engineering had paid more attention to these. And some manufacturers DID...
 

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