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WD Not running right UPDATE

F

Farmall M Beginner

Member
Sorry to bother every one again.
I have a WD that was running great one day and then it wouldn't start the next, here is what I have done so far.
I have put in NEW points and condenser, then took the mag to a shop and it tested out good. I put in NEW spark plugs and I replaced the carbine wires with copper.
I have put in a NEW carburetor rebuild kit.
I have timed the tractor over 30+ times and it still acts like the timing is a little off?
The tractor starts and runs but will not throttle up, I have unhooked the throttle linkage and tried adjusting the throttle on the carb and it still would not throttle up.
When the tractor is running there is NOT any smoke out the exhaust?
If the tractor is running a little out of time how can I change it? I have rotated the mag while the tractor is running and it starts to run better then I am out of adjustment.
I set the timing to all the marks while the #1 cylinder is at top dead center.
If any one has any ideas PLEASE let me know.
Thanks for any info
 
Since you took the mag completely off did you turn the mag BACKWARDS to number 1 before installing? If not your timing will be off 15 to 20 degrees which may explain why you say you are running out of adjustment. Does it change at all when you control the throttle at the carb? Have you tried controlling your fuel at the sediment bowl. Your video to me sounds like you are getting too much fuel. Try just barely opening the fuel line 1/4 turn max if not done so already. You never changed carbs in this whole ordeal have you? According to your video it looks like you have a larger/different carb on there than I am used to seeing on a WD.
 
you apparently know the procedure to rotate the motor by hand to the timing mark and then install the mag... are you using the TDC mark? not the FIRE mark ? THe motor should start at TDC, then advance to fire after it is running over 500 rpm. AFter you install the mag and tightne the bolt, roll the motor over again and listen for the mag impulse to "snap". look into the timing hole one more time and make sure you are at TDC. I normally roll it ONE MORE TIME, and have the #1 plug out and grounded to the frame and watch it "spark" when you hear the "snap" just to make sure your on #1 and didnt have the mag turned forward or backward when trying to get the tangs lined up.
 
I'm going to say you have number one in the right firing order and that is why the timing appears correct but I think maybe your firing order is set with the wrong rotation. What I'm saying is you have set the plug wires on the cap by the firing order but you're going in the opposite rotation of fire. The mag should be clockwise in rotation. My guess is you are set in a counter-clockwise arrangment. The firing order is 1-2-4-3. You may actually be 1-4-2-3. It's easy to do!
 
Thank you every one for the info, I will go out in the morning and start again.
I have not switch carburetors, the one on there is a Marvel Schebler. I also have a WD45 and it has a Zenith. I have been pulling the #1 spark plug and then having someone hold their finger tight on the hole and I have been turning the engine over with the crank until air just starts to push out.
I then put the line beside the "F" mark on the fly wheel to the mark on the bell housing, then I take the mag and rotate it FORWARD (Clockwise) until it is lined up and then I set it all together. The spark plug wires are hooked up the same way as when I took them off, (witch is "CLOCKWISE" so I would hope it is correct because the tractor was running great before.
Thanks again
 
WD normally uses a Zenith carb, the WD45 a TS464 Marvel-Schebler. I time the mag to TDC by finding the compression stroke, then holding a bent wire in #1 hole, turning the crank until the wire reaches the top. With all plugs out, I can turn back and forth with the crank to determine true TDC. I"ve never used flywheel marks. Then turn the mag in proper rotation until lug is close to #1- the top inboard wire port. This info is in archives- I"ve printed it out, and could find the addy for you. Another point- FMJ mags were used on Farmall and AC, and the internal difference is the lag angle, CRS says it"s 30 for AC, 15 for FarmaLL. using one on the other brand, you can adjust for either good starts or smooth running- won"t get both. Even if you did not switch mags, could yours be set up for Farmall? CRS says the lag angle is marked on the impulse.
 
thats your problem... you need to be at TDC when you install the mag. the F is the advance mark fter it starts.
 

"I have rotated the mag while the tractor is running and it starts to run better then I am out of adjustment"...

I think that should be a big clue..the timing is late..
When timing these by ear, the tendency is to over-advance them, but you can get them real close to correct..
You want them to start at TDC or they are gonna Kick back on you, if you try to hand-crank it..
Under a heavy load, you will hear the engine rattle from too much advance, too..
Ron.
 
I have found out today that the timing is till off.
I had the tractor running (rough) and put some propane to it and it did not change the engine RPM.
I will try some more tomorrow.
Thanks for every ones help
 
(quoted from post at 08:56:47 04/09/11) WD normally uses a Zenith carb, the WD45 a TS464 Marvel-Schebler.
Click to expand...

I always hear that most WDs had Zenith on them, but my family has 4 WDs (a '48, two '53 WDs with crooked shifters, and a '55), and all four of them have been only in our family and they all have the MS carbs on them. Confuses the crap out of me. :?:
 
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