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Manually cranking engine?

I have a 1973 Volvo 164.
Is it possible to cause damage or knock the engine out of timing while manually cranking engine during a leak down test?


  • williamBill (@william) Ingham QLD
    I doubt very much that the timing or damage to you engine can be caused to your motor during a leak down test. Your motor should be fitted standard with the most robust set of timing gears being of steel and combustion pressures generated would be far greater than what your leak down test. A good practice is always turn the motor in the direction of running rotation which is in your instance clockwise. I hope this helps
  • Will it cause damage if turned counterclockwise?
  • williamBill (@william) Ingham QLD
    No not at all. It is just a practice that I use especially when setting engine valve and ignition timing more so with engines that use rubber/ kevlar cam belts. It just ensures that all play is taken up with the direction of rotation that the motor runs in thus ensuring a more precise outcome. Maybe I was misleading in stating this in the accidental turning of the engine during a leak down test. I hope this helps.
  • Thanks...no damage during the leak down test from manually cranking or using compressed air. I actually had an issue with reconnecting the spark plug wires. They were in the wrong order at first and I thought the leak down test had caused damage when the car didn’t start.
    Live and learn. Lesson...label wires. It’ll help when you reconnect in a hurry!
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