The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - 47-55.1 Finding TDC

**TX3100Guy** · 07-19-2022, 06:36 PM

My 53 pickup has a 1969 261 cubic inch engine. I currently have the spark plugs out, the valve cover off, and I've removed the Vertex magneto to get it serviced. While I noted the position of the rotor on the cap prior to removing the magneto, I suspect in servicing it the company will have rotated and spun the magneto out of that position.

While I know I can simply advance the gear so that the rotor is in the same position, I've read that it would be better if I got the engine to TDC (cylinder #1) and then when I reinserted the magneto, I could ensure that it was set at the #1 firing position. However, I'm not certain I know how to ensure that I've rotated the engine manually to TDC. Any guidance or tips would be appreciated.

07-19-2022, 06:36 PM	#1
TX3100Guy Senior Member Join Date: Mar 2022 Location: Lucas, TX Posts: 458	Finding TDC My 53 pickup has a 1969 261 cubic inch engine. I currently have the spark plugs out, the valve cover off, and I've removed the Vertex magneto to get it serviced. While I noted the position of the rotor on the cap prior to removing the magneto, I suspect in servicing it the company will have rotated and spun the magneto out of that position. While I know I can simply advance the gear so that the rotor is in the same position, I've read that it would be better if I got the engine to TDC (cylinder #1) and then when I reinserted the magneto, I could ensure that it was set at the #1 firing position. However, I'm not certain I know how to ensure that I've rotated the engine manually to TDC. Any guidance or tips would be appreciated. __________________ 1953 Chevy 3100 - 5 window 1/2 ton pickup My 1953 Chevy Work-In-Process Photo Gallery "I don't have a carbon footprint, I drive everywhere."