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Farmall & IHC Tractors Discussion Forum
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Firing order?

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Ron NH

08-22-2005 19:50:16




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I have a farmall A that ran great until recently. I had starting problems and ruled out fuel, have spark, etc. I found that I can start and run it if I swop the firing order to 4,3,2,1 (rather than 1, 3, 4, 2 - an accident and not running on all cylinders).

Any clue what this means? Timing?

Thanks




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Ron NH

08-23-2005 18:30:33




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 Re: Firing order? in reply to Ron NH, 08-22-2005 19:50:16  
Here was the solution:

Talked to my dad and he suggested that if the guy who owned it before me may have put it back on 1/2 off (like CNKS who said 180 off in prev post). I put the wires back on as though it was off by 180 and it works great and like it used to.

Thanks,

re



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Ron NH

08-23-2005 18:31:54




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 Re: Firing order? in reply to Ron NH, 08-22-2005 19:50:16  
Here was the solution:

Talked to my dad and he suggested that if the guy who owned it before me may have put it back on 1/2 off (like CNKS who said 180 off in prev post). I put the wires back on as though it was off by 180 and it works great and like it used to.

Thanks,

re



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Janicholson

08-23-2005 08:40:49




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 Re: Firing order? in reply to Ron NH, 08-22-2005 19:50:16  
If the engine has good compression, and is mechanically good, then timing/wiring/firing order as described below, is the problem. If there is an issue with a stuck valve, or a big chip of deposit under a valve, wiring incorrectly might allow the engine to run on 4 and 2 (they were still in the correct sequence. Thus allowing 1 and 3 to not fire at all. Though rough, it will run on two cyls. Id use a plug wire pliers (good insulation) to pull off #1 and # 3, at the plug, while running to see if they are dead. If pulling them makes no difference, put the #3 wire on the #1 plug (where it belongs in the correct firing order) and see if things get worse. If so pull that wire and put the wire from pulled from #1 on three where it belongs from the factory. If it now runs on three, #1 cyl needs a compression check/service. My email is open if you need more info. They may be correct, I hope it is wires. Jim Nicholson if

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gene b

08-23-2005 03:56:35




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 Re: Firing order? in reply to Ron NH, 08-22-2005 19:50:16  
There is no way possible the engine will run that way. You better get some one who can help you thru this. What all have you had apart to get messed up. You didnt say if you are running a mag or dist.



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Allan in NE

08-22-2005 23:38:54




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 Re: Firing order? in reply to Ron NH, 08-22-2005 19:50:16  
Ron,

That tractor didn't just change it's own timing. Sounds like your cap is tracking?

Dunno,

Allan



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CNKS

08-22-2005 20:15:44




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 Re: Firing order? in reply to Ron NH, 08-22-2005 19:50:16  
Firing order is 1342, dist cap looks like this viewed from the rear:

2 1
4 3

Thus a firing order of 4321 is impossible. The distributer rotor rotates clockwise viewed from the rear. It is possible to get it 180 degrees out of phase and have it run correctly. However your timing is not off if you haven't changed it. But, if you want to retime it, set the #1 cylinder on TDC -- put your finger in the #1 hole and hand crank until you get pressure, intake and exhaust valves are closed. Rotate the distributer COUNTER clockwise a quarter turn or so (if mag put the top against the block). Pull the coil wire out of the dist cap and hold 1/4 inch from the terminal on the side of the distributer. Rotate the dist/mag clockwise until the mag trips or the distributer sparks. At this time, the hard to find mark on the flywheel should be lined up with the mark on the cover behind the oil pan.

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CNKS

08-23-2005 07:11:02




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 Re: Firing order? in reply to CNKS, 08-22-2005 20:15:44  
As El Toro says, if you have removed the dist/mag, the rotor must point to # 1 on the cap when installing, and the piston next to the radiator must be on the compression stroke. The timing mark is on the flywheel, which is viewed through the hole in the bottom of the torque tube. This is a VERY thin mark that may are may not have some letters stamped next to it. When at TDC on #1, this mark must align with the mark on the cast cover behind the oil pan, all viewed thru the hole. All this is separate from the valve timing -- although both have to be set right for the tractor to run properly.

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iester

08-22-2005 21:03:02




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 Re: Firing order? in reply to CNKS, 08-22-2005 20:15:44  
CNKS & old,Are you saying that I can set(Dot on cam) in line with (Dot on crank) and still be 180 degrees off,Do I have to change at timing cover or can I change at dist? I have not tryed to start mine yet,its a new rebuild



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El Toro

08-23-2005 04:38:02




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 Re: Firing order? in reply to iester, 08-22-2005 21:03:02  
With the timing marks on your cam and crankshaft
aligned are for the valve timing. You're probably
180 degrees off with your distr. You need to
pull No1 plug and bring No1 piston up on the compression stroke until it's at TDC and your
timing mark is in aligned with the indicator on the clutch housing. Your rotor should now be at No1, if not pull the distr. and rotate rotor to No1 position and reinstall. Since the rotor rotates CW your plugs wires should be going to the plugs in this order 1-3-4-2. Hal

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old

08-22-2005 20:13:25




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 Re: Firing order? in reply to Ron NH, 08-22-2005 19:50:16  
Sounds like you have something off. Dist turned wrong or maybe you set up the timing on the exhaust stroke instead of the compression stroke. OR maybe you aren't sure which cylinder is # 1. By the way just in case #1 is the front cylinder closes to the Radiator



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