Question about OTC Digital Timing Light 3367
TDC is Top Dead Center. This is when (For setting the timing) Number One piston is all the way up in the cylinder, and the Intake Valve has closed.
The Combustion cycle is about to occur.
(Four Stroke Cycle engine. Intake, Compression,
The spark plug will spark, igniting the fuel/air mixture, and shove the piston down.
To static time the engine you first remove the Number 1 spark plug. You then place a finger over the spark plug hole, trying to seal it the best you can. Then you have someone BUMP, the engine over, (Or use a Remote Start Switch), until the air pressure blows your finger away. (Not in as harmed!)
You will be observing the harmonic balancer, and the markings on it. You are looking for 0, or TDC on the balancer. What you may have missed, is that when your finger is blown away, the balancer will have gone Past -> TDC.
You need to turn the balancer back to TDC. It is too far forward.
If you keep turning the balancer forward, you will have the exhaust valve starting to open. You need the Intake valve almost closed. Turn the balancer back.
Posted on May 19, 2009
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Posted on Jan 02, 2017
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