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Thread: Bench testing

  1. #1
    thester71's Avatar
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    Bench testing

    Is there any way to do a compression test on the bench before installing the motor, can you jump the starter and turn it over without the electrical box?


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    yeah all you need is a positive cable on the starter and a ground

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    Quote Originally Posted by 785 lugs View Post
    yeah all you need is a positive cable on the starter and a ground
    A ground to the bed plate or to the starter, or both?

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    Quote Originally Posted by thester71 View Post
    A ground to the bed plate or to the starter, or both?
    anywhere on the motor

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    thester71's Avatar
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    Does connecting the positive to the starter cause it to turn over, or do you still have to jump terminals with a screwdriver

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    Quote Originally Posted by thester71 View Post
    Does connecting the positive to the starter cause it to turn over, or do you still have to jump terminals with a screwdriver
    just touching the cable will turn it over

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    Cool, thanks for the info, I'm gonna try tomorrow

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    Quote Originally Posted by thester71 View Post
    Cool, thanks for the info, I'm gonna try tomorrow
    Be careful.

    If you touch the battery positive cable end to the engine casing when the negative battery cable is also connected to the engine, you will create a huge electrical arc/spark (short circuit).

    My suggestion;
    Securely connect the battery positive cable to the starter terminal. Then touch the battery negative cable to the engine block to crank the engine. Use a firm hand to minimize the sparking.

    Make sure the engine doesn't flop around on the bench
    And secure the battery too.

    Make sure the negative cable doesn't get anywhere near the positive cable, and disconnect the cables from the battery right away when you are done. An accidentally shorted battery is not a good thing.

  9. #9

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    you want to put your pos cable on so you don't screw up the threads on the starter

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