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  1. 73FJ40

    timing and backfire

    What is an oil pump cam? Going back to post #13, above, the blade on the bottom of the distributor fits into the slot in the oil pump, turning the pump one revolution for every revolution of the distributor. The camshaft turns the distributor, and the distributor turns the oil pump. Bumping...
  2. 73FJ40

    timing and backfire

    @fcgadget Please research "four stroke cycle" on Google. Look at the piston position at the end of the compression cycle (as the piston continues traveling up to TDC) and also at the end of the exhaust cycle (where the piston also continues up to TDC), and then come back and report on which...
  3. 73FJ40

    timing and backfire

    @Pighead This a truly a "Paul Harvey" moment, ("and now you know the rest of the story"). Your post #3 above lacks any real detail on your method, so you added your quote from a different, 12 year old thread to clarify. Your method is fine for someone who already knows the mechanics of the...
  4. 73FJ40

    timing and backfire

    @fcgadget . I find pigheads post to be misleading. The FSM instruction intends to ensure the blade on the bottom of the dizzy engages the slot in the OIL PUMP before the beveled gears on the dizzy turn the dizzy shaft counter clockwise. If the blade doesn't engage the slot, the oil pump...
  5. 73FJ40

    timing and backfire

    @fcgadget . Wrong! The #1 piston is at tdc at the end of the compression stroke (what you want) and at tdc at the end of the exhaust stroke. YOU CANNOT TELL WHICH TDC BY LOOKING AT THE BB! If this is confusing, search on "four stroke cycle". I've found the correct tdc by removing #1 spark...
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