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The easiest way to find TDC is to disconnect the negative battery cable and then remove the #1 spark plug. Insert a screw driver or similar long, round object inside the hole. Manually rotate the crankshaft with a ratchet/socket and watch as the piston starts to come up. Remove the screwdrive/object and insert your finger into the hole and feel for pressure build-up as the piston rises. If you feel no pressure build-up, the piston is coming up on the exhaust stroke and you will have to rotate the crankshaft another 180 degrees. Repeat the screwdrive/finger procedure. When you feel the presure building up, the piston is coming up on the compression stroke. Remove your finger and re-insert the screwdriver/object and watch while the piston is coming up. When it looks like the piston is going to start the down-stroke - STOP - it is at TDC.

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16y ago

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