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TDC....I'm going nuts!

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Old May 8, 2006 | 10:43 AM
  #21  
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VetteLS6
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From: Albuquerque NM
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This problem stemmed from the a timing issue....not having the distributor pointing at #1 cylinder when the balancer was reading TDC!...The issue came up about how to check is the balancer/damper was bad! So he needs to have Both Valves on #1 Closed.
Then he will know TDC with ignition/cam Timing Firing On #1!
Larry
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Old May 8, 2006 | 01:11 PM
  #22  
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From: Epping NH
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That is correct VetteLS6, probaly should have mentioned that. How does that change BigBlockk's procedure? Just simply wait for both intake and exhaust valve to close and continue? Otherwise I may 180 off on the distributor?
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Old May 8, 2006 | 03:19 PM
  #23  
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Originally Posted by doctorwatergod
That is correct VetteLS6, probaly should have mentioned that. How does that change BigBlockk's procedure? Just simply wait for both intake and exhaust valve to close and continue? Otherwise I may 180 off on the distributor?
When the intake valve closes that cylinder is on the compression stroke. You need to remember that this is a four (4) stroke engine. This means that the piston must go up two (2) times and go down two (2) times to complete each cycle. 2+2=4. However, of the two (2) upward strokes, the only one we want to deal with is the compression stroke. We need some way of identifying the compression stroke. This is why you're watching the intake valve. When the intake valve closes that piston is coming up on the compression stroke. Now, it still has a good 2 1/2" to go before it gets to TDC, but it is coming up on the compression stroke. When the intake valve closes you still have something over 100 degrees of crankshaft rotation to go before the piston is at TDC. It depends on the camshaft profile.

I guess I should have told you that you don't FEEL the piston into TDC with the piston stop. This is why you bent the stop. At very near TDC the crankshaft has infinite leverage. This is why I said that after you install the stop you don't move it until the procedure is complete.

BigBlockk

Later.....
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Old May 8, 2006 | 05:28 PM
  #24  
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From: Epping NH
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Amazing what you can do when you follow instructions!!

Found TDC about 90 degrees from factory mark.

Thanks for all the help and the engine 101 lessons. I'm learning a lot stuff here.
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Old May 8, 2006 | 06:26 PM
  #25  
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I'm glad it worked out.

BigBlockk

Later.....
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Old May 8, 2006 | 06:57 PM
  #26  
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Good Deal ......Bad luck though it seems like you have a bad Dampner!.... I would remove it, inspect for damage, and then replace it with known good one. Then time the car with a timing light.
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