Posted June 21, 20186 yr comment_551413 Hello all, I would be interested in feedback from the forum about how the timing marks are lining up on my 72 240. I found TDC for piston 1 and the pointer is aiming "below" the first mark, see pic. My understanding is the lowest/first mark on the crank should line up with the pointer when cylinder 1 is TDC and 0 degree advance. i have a stock set-up and considering upgrading to electornic ignition module pertronix II. the distributor looks to be advanced about 1/2 way looking at the lines on the body of the distributor, but if the pointer is accurate then could it actually be retarded ~8 degrees? thank you for any insights. Link to comment https://www.classiczcars.com/forums/topic/60247-feedback-on-timing-marks-with-cylinder-1-at-atdc/ Share on other sites More sharing options...
June 21, 20186 yr comment_551416 These should line up for TDC Link to comment https://www.classiczcars.com/forums/topic/60247-feedback-on-timing-marks-with-cylinder-1-at-atdc/#findComment-551416 Share on other sites More sharing options...
June 21, 20186 yr comment_551418 this is a 280 but the same. The pulley turns clockwise from the front of the car. Link to comment https://www.classiczcars.com/forums/topic/60247-feedback-on-timing-marks-with-cylinder-1-at-atdc/#findComment-551418 Share on other sites More sharing options...
June 21, 20186 yr comment_551421 2 hours ago, lking240 said: Hello all, I would be interested in feedback from the forum about how the timing marks are lining up on my 72 240. I found TDC for piston 1 and the pointer is aiming "below" the first mark, see pic. How did you find TDC? Link to comment https://www.classiczcars.com/forums/topic/60247-feedback-on-timing-marks-with-cylinder-1-at-atdc/#findComment-551421 Share on other sites More sharing options...
June 21, 20186 yr Author comment_551427 fashioned a vac/pressure gauge to put in cylinder 1 spark plug hole, remote start bumped it until the marks were close to the pointer, then hand turned the crank until the vac/pressure gauge went back and forth to home in on TDC, and then looked into cylinder 1 through spark plug hole and it was right there. Please tell me if I am missing something. Thanks for all the helpful replies. Link to comment https://www.classiczcars.com/forums/topic/60247-feedback-on-timing-marks-with-cylinder-1-at-atdc/#findComment-551427 Share on other sites More sharing options...
June 22, 20186 yr comment_551450 4 hours ago, siteunseen said: Hey, isn't that backward? The notches will move down as timing advances, so the zero notch should be the bottom one and you'll get 5 degrees per notch by the light as timing advances. I tried to find a reference in the FSM but it says the zero is "to the left", and the picture shows a head-on view. I'm sure those notches will "drop" by the light though as you rev the engine, as the single notch does on the 280. So, he's only a few degrees off. At close to TDC you can move quite a few degrees with almost no piston movement. Edited June 22, 20186 yr by Zed Head Link to comment https://www.classiczcars.com/forums/topic/60247-feedback-on-timing-marks-with-cylinder-1-at-atdc/#findComment-551450 Share on other sites More sharing options...
June 22, 20186 yr comment_551451 The simple direct answer is "yes, your picture looks off by about 8 degrees". Your damper might have slipped, or your method isn't precise. A hard piston stop would be more accurate. Mark both sides and split the difference. Link to comment https://www.classiczcars.com/forums/topic/60247-feedback-on-timing-marks-with-cylinder-1-at-atdc/#findComment-551451 Share on other sites More sharing options...
June 22, 20186 yr comment_551470 I was going by the biggest notch on the pulley, the deeper "V" cut as is shown in Blue's picture and my 240, without using a light to get TDC. You are right though, the piston stop would be best. Link to comment https://www.classiczcars.com/forums/topic/60247-feedback-on-timing-marks-with-cylinder-1-at-atdc/#findComment-551470 Share on other sites More sharing options...
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