The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - MIKE- its here, its here

**swervin ervin** · 11-23-2002, 05:10 PM

Good idea Joe. Never thought of this, but it does happen. Thanks for bringing it up.

Only way to find out would be to of course, find true TDC. Jeff, do you know how to do this? It involves using a piston stop in the number one plug hole. Take all the plugs out to make the engine easier to rotate, then:

You screw the stop in the #1 plug hole, rotate the engine by hand, slowly in one direction until it makes contact with the stop. Don't go fast or you risk damage to the piston. When it makes contact, mark the balancer at the zero on the pointer. Now rotate the engine the other direction until it contacts the piston stop once again. Mark the balancer again at the zero on the pointer. TDC will be exactly center ways between these two marks. If it's exactly at the groove on the balancer, it's right on.

Jeff,

I know your nerves are shot with this crap, and believe me, I know how you feel, but we have to try all possibilites. Like I said eariler, there is no way you should be having spark knock after the mods above.

11-23-2002, 05:10 PM	#12
swervin ervin You get what you pay for Join Date: Dec 1999 Location: Cherryville, NC Posts: 4,798	Good idea Joe. Never thought of this, but it does happen. Thanks for bringing it up. Only way to find out would be to of course, find true TDC. Jeff, do you know how to do this? It involves using a piston stop in the number one plug hole. Take all the plugs out to make the engine easier to rotate, then: You screw the stop in the #1 plug hole, rotate the engine by hand, slowly in one direction until it makes contact with the stop. Don't go fast or you risk damage to the piston. When it makes contact, mark the balancer at the zero on the pointer. Now rotate the engine the other direction until it contacts the piston stop once again. Mark the balancer again at the zero on the pointer. TDC will be exactly center ways between these two marks. If it's exactly at the groove on the balancer, it's right on. Jeff, I know your nerves are shot with this crap, and believe me, I know how you feel, but we have to try all possibilites. Like I said eariler, there is no way you should be having spark knock after the mods above.