How do you tell if pistons is at Bottom Dead Cente

Discussion in 'RC Offroad Forum' started by Jag, Feb 1, 2004.

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  1. Jag

    Jag New Member

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    Hopefully I'll get a few replies to my previous post. But here's another question. During break in, you are supposed to bring the piston to BDC after you shut down. How do you know when the piston is at BDC? Do you have to remove the glow plug, and then use some sorta feeler in the cylinder to jugde that the piston is at BDC? I don't really see how you can tell by just looking externally at the moter. Thanks for the advice,
    Jag
  2. mastmec

    mastmec Member

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    Rotate the flywheel by hand and feel for the resistance both ways and then put it in the middle.
  3. dudex

    dudex Member

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    at bdc it will turn really easily. doesnt have to be exactly at bdc you just dont want it to be too high up the cylinder when the engine cools.
  4. WESTSIDERIDER310

    WESTSIDERIDER310 Member

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    I think you can also pull the pull start until you don't feel resistance. But don't yank on it, just a slow gentle pull until you don't feel any resistance, then stop. But i might be wrong.
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