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Thread: timing a 30

  1. #1
    Join Date
    Aug 2007
    Fort Collins, CO

    Default timing a 30

    Could someone provide instructions how to time a 30? I have timed some old John Deeres and was wondering if it is a similar procedure?

  2. #2
    Join Date
    Nov 2006


    I think you’ll have to find, first, which magneto, either the Eisemann GV-4 or a Bosch. OM should be along soon, I think he will have that information.
    Old Caterpillar Watch Fob.

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  3. #3
    Join Date
    Jan 2008
    Piedmont, South Dakota


    We have always set the engine to TDC on any cylinder. Fire the magneto using the impulse , make sure you know which leadout it is firing so you can connect that leadout to the cylinder on TDC, then connect the magneto to the tractor without rotating either the mag or the engine. Make any matching adjustment through the coupling mechanism. Connect spark plug wires in order of rotation of the mag to the firing order of the engine (1-3-4-2 ?). The book has detailed instructions doing essentially the same thing. Hope this helps.

  4. #4
    Join Date
    Nov 2006
    Monterey Hills

    Default CAT 30 S & PS Firing Order

    CAT 30 S and PS series firing order is 1243. Bill

  5. #5
    Join Date
    Apr 2007
    Elkhorn, WI

    Default CAT 40 Timing is......

    When I set valve clearances on the 40 Gas, I noticed that the Magneto Timing is 1,2,4,3 (this is not the same as in the 35/40 operators manual). A quick telephone call confirmed this with a blanket statement of "All bigger Gas CATS firing order is 1,2,4,3".

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