2N With No Power Under Load

Hi Guys,

Well, I was able to get the leaky lower lift pin issue resolved and finally took the 2N out for a test run last night. I attempted to do a little field work and the 2N bogs down under load - starts, idles and revs fine, but as soon as I put a load on it or attempt to drive it in 3rd gear, it just about stalls and backfires. I believe I've narrowed this down to a timing issue; however, there is a lot of slop in the governor linkage. I can advance the throttle about 1/4 before the linkage begins to actually advance the throttle and put tension on the governor spring. How much of a problem is this? Under load I can see the governor fully opening the throttle, so it appears to be working as it should (less the slop, obviously). Also, when I move the throttle lever all the way forward (fully closed), I can hear a subtle grinding/whirring noise coming from the governor, which stops once the throttle is advanced enough to put tension on the governor spring. Thoughts?

Thanks!
-Chris

I doubt the problem is in the governor. First thing to check is spark. Will the spark jump a 1/4" gap? IF spark is ok I would check fuel flow thru the carburetor. Remove the drain plug on the bottom of the cqrb and catch the gas in a clean container. Should flow a pint in 1 to two minutes. If spark and fuel flow are od, I would open the main adjusting needle on the carg 1/2 turn. If neither of these remedies work and you are absolutely sure that spark and fuel flow are ok, I would removed the carb, disassemble it and soak it overnight and then blow out all the passages with compressed air. I would then put an economy kit (needle valve, seat, and gaskets) in it make sure the float is ok and set correctly and put it back on the tractor. Initial carb adjustment is 2 turns out on the main screw and 1/2 turn out on the idle screw.

If spark will not jump a 1/4" gap it is time for new correctly gapped points.

Chris ,Your governor spring should just become slack when it is in the idle position,if it is too loose it won't open the carb correctly.You can tighten it up by using a big pair of channel lock pliers grab and bend both spring hooks inward at the same time.

3rd gear on an N is road gear. What are you trying to pull?

(quoted from post at 11:25:02 06/08/17) Hi Guys,

Well, I was able to get the leaky lower lift pin issue resolved and finally took the 2N out for a test run last night. I attempted to do a little field work and the 2N bogs down under load - starts, idles and revs fine, but as soon as I put a load on it or attempt to drive it in 3rd gear, it just about stalls and backfires. I believe I've narrowed this down to a timing issue; however, there is a lot of slop in the governor linkage. I can advance the throttle about 1/4 before the linkage begins to actually advance the throttle and put tension on the governor spring. How much of a problem is this? Under load I can see the governor fully opening the throttle, so it appears to be working as it should (less the slop, obviously). Also, when I move the throttle lever all the way forward (fully closed), I can hear a subtle grinding/whirring noise coming from the governor, which stops once the throttle is advanced enough to put tension on the governor spring. Thoughts?

Thanks!
-Chris

Click to expand...

One of my 8ns will act like that when one of the cylinders fouls the plug. I got a ring problem in number one and every so often she will start to run on three. runs pretty good really but no power at all.

Wasn't trying to pull anything in 3rd... once I realized I had a power issue I wanted to "test" the power by trying to run down the driveway in 3rd... good point though!

Hey guys - here's an update. I've spent the last week fiddling with the timing - I'm certain I have it right, or very close to being correct. However, advancing and retarding the timing does not affect the lack of power under load at all whatsoever.

The intake manifold bolts were slightly loose (assuming 71 years of vibration), torqueing these down made a SLIGHT difference, but doesn't even get me close to what normal operating power should be - still can't climb a reasonable incline in 1st gear.

Other info - all the ignition components are new - points, condenser, coil, plugs, wires. Points are gapped correctly, strong, powerful spark on all four cylinders. Spark easily jumps a 1/4" gap.

Carb is new, fuel flow is strong. I've gotten it down to a smooth slow idle, revs fine. Interesting observation - if I disconnect the fuel line from the carb and drain the fuel from the tank, the fuel color is normal; however, if I drain the fuel from the bottom of the carb, it is a reddish color. Not sure what's going on here...

I have not yet checked the compression... going to try that tomorrow night.

If compression checks out, I'm thinking the problem may lie in the distributor advance weights... what in particular should I be looking for here?

Thanks!
-Chris

[b:11601ac9e2][i:11601ac9e2]
you say.....:" Interesting observation - if I disconnect the fuel line from the carb and drain the fuel from the tank, the fuel color is normal; however, if I drain the fuel from the bottom of the carb, it is a reddish color. Not sure what's going on here... "

I would guess that reddish fuel out of the carb., is rust that busted loose in your fuel system, and is plugging up a passage in yer carb.! Just a WAG!!!
Time to take the carb apart and check all the passages, and the bowl.!??

Gary[/i:11601ac9e2][/b:11601ac9e2]

Agrre with GB in MT. May be running too lean. Carb dirty, main jet closed a bit too much, more air leaks, etc.

..... but doesn't even get me close to what normal operating power should be - still can't climb a reasonable incline in 1st gear...

........ I've gotten it down to a smooth slow idle, revs fine.....

Click to expand...

Your carb has two circuits , idle and power . Gas flows through the idle circuit but switches to the main jet when the butterfly is opened more . You can have a small amount of gas flow through the main jet to get rpm up if it is not under a load . When it is under a load it will require more fuel . If the fuel flow through the main jet is insufficient you will have no power .