Is the #1 piston in the "firing position" when it is at TDC for the "compression stroke (i.e., at the completion of the compression stroke)"? I'm attempting to find TDC using a vacuum gauge procedure I found on you-tube (which seems to be pretty nifty) but I'm a little confused (doesn't take much) with the terminology. Thanks.
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"Firing" Stroke
- Thread starter johnd
- Start date
RootesRacer
Donation Time
This is usually referred to as the "power" stroke.
Just curious about the vac guage method, tell me more.
Is there a reason you cant find TDC with the timing marks ?
See the following link to a you-tube "how-to" - https://www.youtube.com/watch?v=u2sA-q7_FtQ. It 's an easy (and I believe accurate) way to find TDC (compression stroke vs. intake stroke) when you are working by yourself. I just happened to have both a compression tester and a vacuum gauge.
RootesRacer
Donation Time
But the gears are marked and indexed by the key off the crank.
Pretty tough not to do that right.
If you really want to find an accurate TDC, use a piston stop. I made one by knocking the porcelain from an old spark-plug, welding a nut to the top and grinding the head of an appropriate bolt more or less round. Screw the bolt into the nut welded to the plug, Screw the plug into the spark plug hole on number 1 cylinder. Turn the engine until piston stops because it hits the stop. Make a mark on the front pulley. Turn the engine the other direction until it stops. Mark that. TDC is half way between the marks.
To fine tune it, loosen the piston stop, do it again. Will post a picture of my piston stop tomorrow.
To fine tune it, loosen the piston stop, do it again. Will post a picture of my piston stop tomorrow.
I bought one of those a few years ago but never knew how to use it. Thanks.