need help on firing order for scout 2 with 345

Discussion in 'General IH Tech' started by Davidmyers, Jun 5, 2004.


  1. Davidmyers

    Davidmyers Farmall Cub

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    I need help on the firing order I was tuning my scout in i guess i misplaced one of the wires now i need to get it right again any help would be helpful i know the order im not sure on how the cyl numbers are though
     
  2. Eric Underriner

    Eric Underriner Binder Driver

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    The order is cast into the intake manifold. Scrap off the mud and find it.
     
  3. Nevada S.

    Nevada S. Farmall Cub

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    According to the International Service Manual, firing order for a 345 is: 1-8-4-3-6-5-7-2 (my manual is Scout II XLC series 1975 thru 1977). Hope this helps. :)
     
  4. VegasJud

    VegasJud Farmall Cub

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    The firing order is cast into the manifold just behind the T-stat housing (kinda keeps it handy for us). Don't forget to time the engine off #8 cylinder.
     
  5. Munchies

    Munchies High Wheeler

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    Nevada it starts with 8 doesn't it? I forgot scout's too far away to go look.
     
  6. Munchies

    Munchies High Wheeler

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    Im sorry nevada, I was incorrect, I just looked 1-8-4-3-6-5-7-2 indeed.
     
  7. Doug Shailor

    Doug Shailor Guest

    Cylinder numbering on IH SV (266,304,345,392) V-8's...

    The left side front to back is 1,3,5,7. The right side front to back is 2,4,6,8.
     
  8. Dick S. Moore

    Dick S. Moore Farmall Cub

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    Here`s a good one to Keep
     

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  9. Doug Shailor

    Doug Shailor Guest

    Excellent!

    Thank you, Dick. I did just that.

    Doug
     
  10. James Ruth

    James Ruth Farmall Cub

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    Thank you! I am new to the Scout II, coming from British TR-6 land. Thus forum is fantastic and the folks are awesome!
     
  11. mallen

    mallen High Wheeler

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    Remember that the wire labled 19 MUST go behind the carb to keep it away from its neighbor. There was an IH service bulletin on it. Supposedly it crossfire's with another cylinder and can cause engine damage if you don't route it like that.
     
  12. James Ruth

    James Ruth Farmall Cub

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    Thanks I appreciate the good advice. I will follow the wiring diagram to a T!!!
     
  13. scoutboy74

    scoutboy74 Dreams of Cub Cadets

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    In the SV8 firing order, cylinders 5 and 7 are the only adjacent cylinders that fire in succession. Hence the routing of the cylinder 7 plug wire behind the carb to keep it separated from the cylinder 5 plug wire. Plug wire composition has improved considerably over the last 45 years. So is this wire segregation necessary with modern, high quality plug wires? Probably not, but if you have enough length in your #7, you might as well do it as a just in case.
     
  14. mallen

    mallen High Wheeler

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    I thought about that when I cut my custom wire set, but then I thought, how many times has somebody thought they knew better than the manufacturer, and ended up really screwed something up. Sometimes you have no choice, ,sayfor example,an original part is not available. Sometimes it's a an upgrade that has massive benefits, like fuel injection or electronic ignition. But why change it up just to avoid routing a wire behind the carb. You probably don't need to ,but if your wrong....
     
  15. 1975IH200

    1975IH200 High Wheeler

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    Trevor is correct in that the new plug wires of recent manufacture should not have this 'crossfire' issue.
    If you are still concerned, then you can run the 5-7 wires in parallel, then cross them just before the spark plugs.
    small-DUI - Secondary Wiring - Left Bank 1-3-5-7 copy.jpg
     

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