AMC Eagle Den Forum

The Shop => Question and Answer => Topic started by: ericarmstrong on March 28, 2011, 02:10:36 PM

Title: Any methods of finding TDC without timing marks?
Post by: ericarmstrong on March 28, 2011, 02:10:36 PM

I have reason to believe my damper timing mark may have shifted. Anyone have a method for accurately testing this?

Title: Re: Any methods of finding TDC without timing marks?
Post by: ammachine390 on March 28, 2011, 02:23:45 PM

Couldn't you spin the engine until the distributor rotor gets to the number 1 spark plug tower on the cap. It wouldn't be exactly TDC but it would be close, just a little BTDC.

Title: Re: Any methods of finding TDC without timing marks?
Post by: ericarmstrong on March 28, 2011, 02:25:16 PM

Only issue there is that I static timed the distributor according to the damper mark.

Title: Re: Any methods of finding TDC without timing marks?
Post by: ericarmstrong on March 28, 2011, 02:31:43 PM

The screwdriver sounds like a plan to me. I may try the old  thumb over hole 1 method instead of pulling the valve cover to ensure I'm not 180 out.

Title: Re: Any methods of finding TDC without timing marks?
Post by: AMCKen on March 28, 2011, 02:32:13 PM

...and if you have the screwdriver in just enough that you can't/won't turn the engine anymore, mark the spot on the damper. Then turn the opposite way until it stops again and mark it. TDC will be halfway between the marks.

Title: Re: Any methods of finding TDC without timing marks?
Post by: ammachine390 on March 28, 2011, 03:32:22 PM

if the car still runs, you can still use the distributor rotor position to make sure you are not off 180 degrees

Title: Re: Any methods of finding TDC without timing marks?
Post by: ericarmstrong on March 28, 2011, 03:38:38 PM

Quote from: ammachine390 on March 28, 2011, 03:32:22 PM

if the car still runs, you can still use the distributor rotor position to make sure you are not off 180 degrees

The car runs like a champ, and that's a good idea.

Title: Re: Any methods of finding TDC without timing marks?
Post by: doneagle on March 28, 2011, 03:55:36 PM

Quote from: casper on March 28, 2011, 02:27:44 PM

you pull spark plug out of #1 hole. pull off valve cover. drop a long screwdriver into the plug hole. crank engine around till the screwdriver stops going up. now, you have to make sure that BOTH intake and exhaust valves are closed. if they are not both fully up, your 180* off. that will get you about as close as you can get without pulling off and installing a new damper.

              HI    if you don't want to take the valve cover do what Casper said .When you get the piston up .look at
              the taming mark and see if its right on or 180 out....the thumb will get you close .....Don