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Farmall & IHC Tractors Discussion Forum
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Firing order for an h with 12 V conver

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Luke in Ohio

05-19-2008 15:28:18




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I put a 12 volt conversion on my H, thought it would help in starting easier. Well my distributer is upright-not sidways anymore-and i was wondering if anyone knew of the firing order starting with the outermost wire on the dist. being #1 and rotating clockwize until arriving at #4 being closest to the radiator. To make it easier go with the plugs being 1 toward the transmission and 4 being the plug by the radiator. I cant figure it out and was hoping someone on here knew. Thanks

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ChrisAS

05-21-2008 09:26:04




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 Re: Firing order for an h with 12 V conver in reply to Luke in Ohio, 05-19-2008 15:28:18  
If you change the time from #1 to#4 with 12V you should at least end up with an M over the H



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mkirsch

05-21-2008 10:57:17




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 Re: Firing order for an h with 12 V conver in reply to ChrisAS, 05-21-2008 09:26:04  
It doesn't matter if you count #1 at the radiator or the transmission, as long as you time whatever cylinder you choose to TDC on the compresison stroke. I've seen tractors timed both ways, and they run fine.

My first question is, why would converting to 12V change the orientation of the distributor?

My second question is, why would converting to 12V change the timing? I've done an H and an M, and neither required touching the distributor or the spark plug wires.

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Nebraska Cowman

05-20-2008 05:19:40




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 Re: Firing order for an h with 12 V conver in reply to Luke in Ohio, 05-19-2008 15:28:18  
You have two issues here, firing order and timing. Firing order is always stated counting from the front. #1 being closest to the radiator end. You need to find when #1 cylinder is in position to fire and then set the distibutor acordingly.



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Janicholson

05-19-2008 15:47:33




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 Re: Firing order for an h with 12 V conver in reply to Luke in Ohio, 05-19-2008 15:28:18  
All firing order systems ON IH that I am aware of are radiator as #1. Then #3 then 4 then 2.
Pull #1 plug, put your thumb in the hole and crank the engine by bumping the starter (ignition off).
When you feel compression pressure, the #1 piston is moving toward TDC.
Put a 8" piece of copper wire in the hole and turn the engine By hand with the fan belt and fan until the wire is almost at the top.
The timing marks will now be almost aligned. Turn it until they are aligned.
The dist rotor will now be pointing at a plug tower (assumes it was not moved)
Put number one plug wire in that hole the next wire is Clockwise one tower and connects to #3.
Then clockwise to #4, then the last one at #2. If it is out of itme, set the points to .020", then turn the distributor (while at TDC on #1) until the points just break. (use an ohm meter across them to ground, or a volt meter with the ignition on. to set the break point at TDC.
JimN

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Hugh Mackay

05-19-2008 15:39:02




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 Re: Firing order for an h with 12 V conver in reply to Luke in Ohio, 05-19-2008 15:28:18  
Luke: All Farmall engine start with No.1 being closest the radiator. From there it's 1 - 3 - 4 - 2. A different distributor or voltage can not change the firing order, that is predetermined by crankshaft and camshaft.



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