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Farmall & IHC Tractors Discussion Forum
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What would the gap be on a 300?

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Levi K

06-27-2006 20:00:19




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How big should the gap be on the plugs for on a 300. finally got it to run right, but the ampmeter still is getting juice with the key off, thanks for any advice.




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wshank0101

06-28-2006 16:45:37




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 Re: What would the gap be on a 300? in reply to Levi K, 06-27-2006 20:00:19  
My 300 manual shows plug gap @ .023



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John T

06-28-2006 06:12:00




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 Re: What would the gap be on a 300? in reply to Levi K, 06-27-2006 20:00:19  
Levi, an Ammeter is almost a dead short circuit across its terminals (The "Ideal" Ammeter would be zero ohms) and indeed BOTH its terminal should show hot battery voltage with respect to frame ground if its good. Its SUPPLY terminal wires to the battery/starter often at the big battery cable post on the starter switch/solenid while its other LOAD terminal feeds loads like lights and ignition etc PLUS wires to the BAT terminal on a Cutout Relay or Voltage Regulator, thats how n where the gennys output gets coupled up (when relay closes) to the battery to pump current into it to charge it through the ammeter. A Key Switch MUST have hot battery voltage on its BAT input terminal so when its turned ON it can supply that voltage to the ignition coil (via its IGN output terminal) and it derives that voltage from the LOAD terminal on the ammeter as descrived above UNLESS you have a 4 pole VR with an L terminal which then supplies that voltage.

I tend to err on the high side on plug gaps on stock coil n points ignitions and run around 0.025 usually, I have no specs or data for what that tractors is supposed to be, however.

Best wishes

John T

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Nat 2

06-28-2006 04:59:49




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 Re: What would the gap be on a 300? in reply to Levi K, 06-27-2006 20:00:19  
The Amp meter is connected directly to the battery on one side, and to the key on the other side. It will get juice with the key off, but it should not show a discharge.



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jerry klauss

06-27-2006 23:07:39




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 Re: What would the gap be on a 300? in reply to Levi K, 06-27-2006 20:00:19  
1979 champ. cat. shows D15Y gap .025
hope this helps.
jerry



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Janicholson

06-27-2006 20:30:27




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 Re: What would the gap be on a 300? in reply to Levi K, 06-27-2006 20:00:19  
The amp meter must get juce with the key off. If not there will be none for thecoil, or accessories. If it is showing discharge, then there are issues. The Gap is .o2o" Good luck,
JimN



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Janicholson

06-28-2006 13:42:48




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 Re: What would the gap be on a 300? in reply to Janicholson, 06-27-2006 20:30:27  
Sorry, I gave the point gap. .035 on plugs.
JimN



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