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Timing a Farmall A

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Alvin Turner

07-05-2002 09:24:49




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Have a Farmall A tractor that I am in the process of rebuilding. It has the crank start - no battery or starter. Have had the case cleaned and valves set. Cam is good. It will start but pops out the carbureator. Could my problem be timing? If so how do you set the timing? I have tried everything. Would appreciate any help.

Alvin




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JohnnyB

07-05-2002 19:22:39




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 Re: Timing a Farmall A in reply to Alvin Turner, 07-05-2002 09:24:49  
I just timed my hand crank A last week, simple procedure, yank #1 spark plug out, take off the magneto cap,stick your finger over the plug hole and bring the #1 piston up on the compression stroke, you will feel pressure building and then the mag will impulse, (go click), look at the cap and figure out where the #1 plug wire should be plugged into the cap. Then arrange the wires according to the firing order cast on the side of the block, I think its 1-3-4-2, you might have to retard the distributor a little to get it to start then when it's running adjust the mag position where it runs good. I never used a timing light, but I spose you could set the position with that.

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Alvin Turner

07-05-2002 19:27:23




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 Re: Re: Timing a Farmall A in reply to JohnnyB, 07-05-2002 19:22:39  
I have done about everything I can think of to get this 'pop' out of the carbureator. If I take the #4 or last plug wire off it won't do it. Is that the timing or can it be something else. Also, how do you adjust the magneto? I didn't know you could.

Alvin



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DON LC

07-06-2002 17:05:47




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 Re: Re: Re: Timing a Farmall A in reply to Alvin Turner, 07-05-2002 19:27:23  
You pulled the #4 plug wire and it quit popping through the carb....back off the rocker arm(more loose) on #4 intake valve....If the poppin stops it's valve adjustment.....It has been 20 years since I worked on one of these....I think if you set top dead center on #1 on compression stroke stop on TDC mark on front pully..both intake and exhaust valves will be closed.push rods should be loose...adjust both #1 valve lash...turn engine 180 until the mark on the pully is aligned again...next cylinder in firing order should be at TDC..see if push rods are loose...adjust valve lash...another 180 do the next one..... any way, every time you turn 180 there should be a cylinder with loose push rods on both intake and exhaust valves, closed ready for adjustment..... I hope I rembered right

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DON LC

07-07-2002 05:43:55




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 Re: Re: Re: Re: Timing a Farmall A in reply to DON LC, 07-06-2002 17:05:47  
I think you are guessing TDC on the cylinder you are adjusting the valves on....you can't do that ....you know how to find the compression stroke,but you must stop at the TDC mark on the front crank pully....only one cylinder will have both valves closed,,,both push rods should be loos enough to turn them with your fingers...there will be other push rods loose but you are looking for the cylinder that has BOTH push rods loose.....read my post above.....Your problem is inproper valve adjustment....I'll bet that if you just back off the intake valve on #4 about 1/4th or 1/2 turn the popping will go away....just trying to help.

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Alvin Turner

07-09-2002 18:35:27




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 Re: Re: Re: Re: Re: Timing a Farmall A in reply to DON LC, 07-07-2002 05:43:55  
We took the little gear out of the magneta looking for a set of points. We had never fooled with one before so we didn't know what we were doing. It will start and run, but it has the pop out of the exhaust now instead of the intake. How do you set the timing from the very first step til timed? We have tried everything. We have adjusted and readjusted valves and checked push rods and worked with the timing until we are stumped.

Alvin

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Alton

07-10-2002 16:39:10




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 Re: Re: Re: Re: Re: Re: Timing a Farmall A in reply to Alvin Turner, 07-09-2002 18:35:27  
Alvin. Turn the engine to Number 1 compression stroke by aligning the marks found on the flywheel with register on clutch housing cover located on bottom of clutch housing. Marks DC/1-4 should be in register. If you have removed the magneto. Turn the magneto drive lugs until rotor arm in is the number 1 firing position and mount ignition unit on engine. If you have not removed the magneto. Loosen the magneto mounting bolts and retard the magneto by turning top of magneto in the normal direction of rotation. Should be clockwise. Turn engine in cranking direction one complete revolution and align marks as before. Advance magneto by turning top of magneto in opposite direction of normal rotation until impulse coulping snaps then tighten the magneto mounting bolts. Check by turning engine to number 1 piston is again coming up on compression stroke and impulse couplier snaps at this time the timing marks should be in alignment with the register. (The rotor in the magneto should align with #1 piston firing position on the cap when you have the little gear correct. If not align them up and it shouold be right.)

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Alton

07-10-2002 16:41:46




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 Re: Re: Re: Re: Re: Re: Re: Timing a Farmall A in reply to Alton, 07-10-2002 16:39:10  
Alvin

The valve gap is 0.014 Hot
Point gap 0.013
Magneto timing TDC impulse snap



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Alvin Turner

08-04-2002 12:22:08




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 Re: Re: Re: Re: Re: Re: Re: Re: Timing a Farmall A in reply to Alton , 07-10-2002 16:41:46  
We finally got it smoothed out. Need sheet metal parts now. Know where we can get them?



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Alton

07-05-2002 18:50:14




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 Re: Timing a Farmall A in reply to Alvin Turner, 07-05-2002 09:24:49  
Check firing order, Check valve adjustment, Check point gap, Check timing, Set timing with timing light is best. Need a battery to hook up timing light. Check carb for rich mixture when running.



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Alvin Turner

07-05-2002 19:21:52




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 Re: Re: Timing a Farmall A in reply to Alton, 07-05-2002 18:50:14  
I have checked and rechecked the firing order, valves, point gap, etc. I have tried to set the timing. It still pops out the carbureator. If you take the plug off the back (#4) cylinder, it won't do it. Any other suggestions?

Alvin



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JohnnyB

07-06-2002 11:17:58




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 Re: Re: Re: Timing a Farmall A in reply to Alvin Turner, 07-05-2002 19:21:52  
Alvin, are you sure your intake valve on #4 is closing all the way, take out the #4 sparkplug and put your finger over the hole and test to see if it will build compression, if it doesn't make any compression then one of the valves are not closing( i'd say the intake since its backfiring out the carb)



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