Timing Gear Question
Thread Starter
Joined: Jan 2011
Posts: 30
From: Colorado
Timing Gear Question
Planning to install timing gears and chain to replace Pete Jackson gear set (noisy). Removed cover. Aligned crank with timing mark and key vertically. Cam gear looks to be off one tooth based on its timing mark. Any idea if could be installed correctly this way? Car runs just fine. Or do you think there might be a mistake with the way the gear set was installed?
Thread Starter
Joined: Jan 2011
Posts: 30
From: Colorado
Thank you. The engine is a 302 modified to a 347 stroker. The timing mark on the cam is such that it lags the crank. That is, when turning crank clockwise, its timing mark passes vertical before the timing mark on the cam gear reaches the 6 o'clock position. Would that make sense based on someone wanting to change the cam profile?
2nd Gear Member
Joined: Oct 2011
Posts: 446
From: AL
Thank you. The engine is a 302 modified to a 347 stroker. The timing mark on the cam is such that it lags the crank. That is, when turning crank clockwise, its timing mark passes vertical before the timing mark on the cam gear reaches the 6 o'clock position. Would that make sense based on someone wanting to change the cam profile?
some pics could probably help a lot.
6th Gear Member
Joined: Jan 2007
Posts: 5,469
From: AR
IDK how the Pete Jackson gear drive is supposed to be set up, but I suspect it was timed wrong. I think being off as much as it looks in the picture is too much for this to be an attempt a degreeing the cam.
In any case, I would install the timing sprockets and chain "right" (line em up) and degree from there, (if you want to degree the cam), regardless of what was done before.
In any case, I would install the timing sprockets and chain "right" (line em up) and degree from there, (if you want to degree the cam), regardless of what was done before.
2nd Gear Member
Joined: Nov 2010
Posts: 493
From: Ontario
IDK how the Pete Jackson gear drive is supposed to be set up, but I suspect it was timed wrong. I think being off as much as it looks in the picture is too much for this to be an attempt a degreeing the cam.
In any case, I would install the timing sprockets and chain "right" (line em up) and degree from there, (if you want to degree the cam), regardless of what was done before.
In any case, I would install the timing sprockets and chain "right" (line em up) and degree from there, (if you want to degree the cam), regardless of what was done before.
6th Gear Member
Joined: Jan 2007
Posts: 5,469
From: AR
You could look on the front of the cam for a part number, but I doubt you will find one there, but it is only two bolts away....
6th Gear Member
Joined: Dec 2005
Posts: 5,212
From: Hills of California
I think it was also timed wrong....probably
If you notice the dot is below the 0 indicator on the cam gear. If they wanted to advance the timing they should have used the dot indicated by the A lining these dots up would adv 4 deg (about 1/2 tooth or less) the R indicates 4 deg retard. In any case the dots should be lined up...that's probably 10 deg of either advance or retard (not sure which) I doubt the cam specs would call for that much.
If you notice the dot is below the 0 indicator on the cam gear. If they wanted to advance the timing they should have used the dot indicated by the A lining these dots up would adv 4 deg (about 1/2 tooth or less) the R indicates 4 deg retard. In any case the dots should be lined up...that's probably 10 deg of either advance or retard (not sure which) I doubt the cam specs would call for that much.