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I have never built an engine. What I would like to know is how does tdc get moved on the dampener.

    What I mean is on my car the engine a 351 c 71my which has been rebuilt and strengthened tdc doesnt line up with the #1 piston and the distributor.

    The dampener looks original and kind of ratty. Some of the rubber has fell out of it.

    I just drew me a new tdc but it’s on the other side of the dampener from the factory tdc. So has that dampener moved or can you build an engine with an upgraded cam that makes the tdc read different. 
   Also the time is coming I’m gonna build an engine. Thanks in advance.

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The camshaft has nothing to do with TDC, the damper hub is connected directly to the crankshaft, the crankshaft moves the pistons to TDC.

The outer ring with the timing markings on it is held in the correct position in relation to the hub and crankshaft by rubber or an elastomeric. Because yours has bits of rubber falling out it is likely the bond between the timing ring and rubber has failed, allowing the ring to rotate around the hub.

Edit: You'll have 2 events where TDC shows on the timing ring, one at the top of the exhaust stroke, the other at the top of the compression stroke. The compression TDC is what timing and the distributor are set to.

Edited by Don C



“If you can't explain it simply, you don't understand it well enough.”

--Albert Einstein


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