when installing the timing chain..
Thread Starter
Senior Member
Joined: Nov 2000
Posts: 762
Likes: 2
From: Riverside, CA
Car: 1987 Camaro IROC-Z
Engine: 305TPI
Transmission: 700R4
when installing the timing chain..
you have it installed correctly when the dot on the timing gear is at the TOP for #1 cylinder TDC, right? at this point the crank gear is always at the top, right?
Other than that, it doesn't matter where the cam is as long as those two dots are at the top...
Man, I shoulda taken pics while it was torn down so I could reference them.. Maybe I'll start doing that.
How would the car run if the cam gear was one tooth retarded? Reason I'm asking is, when I set the motor at TDC I had the motor out of the car. I took a marker and dropped the distributor with the rotar facing #1 cylinder at TDC. When we went to start the car, it was acting like it was retarded, and to get it to run right we had to advance the distributor about 1/2" to hit TDC. Would that give you the impression that the cam would be 1 tooth retarded?
------------------
Webmaster: www.IROC-Z.org
Other than that, it doesn't matter where the cam is as long as those two dots are at the top...
Man, I shoulda taken pics while it was torn down so I could reference them.. Maybe I'll start doing that.
How would the car run if the cam gear was one tooth retarded? Reason I'm asking is, when I set the motor at TDC I had the motor out of the car. I took a marker and dropped the distributor with the rotar facing #1 cylinder at TDC. When we went to start the car, it was acting like it was retarded, and to get it to run right we had to advance the distributor about 1/2" to hit TDC. Would that give you the impression that the cam would be 1 tooth retarded?
------------------
Webmaster: www.IROC-Z.org
Supreme Member
Joined: Jul 1999
Posts: 18,457
Likes: 16
From: Loveland, OH, US
Car: 4
Engine: 6
Transmission: 5
You are correct. Both maeks at the top is #1 firing. It's easier to line up the marks when they're together, which will be #6 firing. Since the gear can only go on the cam in one place, if the gear is right, the cam will be too.
------------------
"So many Mustangs, so little time..."
ICON Motorsports
------------------
"So many Mustangs, so little time..."
ICON Motorsports
Thread Starter
Senior Member
Joined: Nov 2000
Posts: 762
Likes: 2
From: Riverside, CA
Car: 1987 Camaro IROC-Z
Engine: 305TPI
Transmission: 700R4
well, i guess i'll have to double check it then, i'm not sure what the problem is but i KNOW it's not pushrods now..
thanks for backing me up, i just wanted to make sure i was right
[This message has been edited by ColinOpseth (edited June 14, 2001).]
thanks for backing me up, i just wanted to make sure i was right
[This message has been edited by ColinOpseth (edited June 14, 2001).]
Thread Starter
Senior Member
Joined: Nov 2000
Posts: 762
Likes: 2
From: Riverside, CA
Car: 1987 Camaro IROC-Z
Engine: 305TPI
Transmission: 700R4
alright, well that's not my problem now, this is why:
I pulled off the timing chain cover and rotated the engine to #6 TDC to doublecheck the cam and crank gears. Dead on. I got out from under the car to double check, hoping this was the problem. Nope, I put it on the right way the first time
I pulled off the driver side valve cover (easy now that all the accessories are out of the way) and with the motor at #6 TDC I rotated the engine 1 full rev and watched the #1 intake valve. I watched it go from open at #6 TDC to closed about 90 degrees from #1 TDC. So, the cam is installed correctly and I set the valves right.
What else could be causing this?? I've posted in other threads, and I'm slowly narrowing things out...
So now it's not:
Timing Chain
Crank or Cam gears
Incorrect Valve Lash
I still think it's something to do with the valves, due to the amount of air/fuel mixture that's being kicked out back through the throttle body.
Ideas on this?
Thanks
Colin
------------------
Webmaster: www.IROC-Z.org
I pulled off the timing chain cover and rotated the engine to #6 TDC to doublecheck the cam and crank gears. Dead on. I got out from under the car to double check, hoping this was the problem. Nope, I put it on the right way the first time
I pulled off the driver side valve cover (easy now that all the accessories are out of the way) and with the motor at #6 TDC I rotated the engine 1 full rev and watched the #1 intake valve. I watched it go from open at #6 TDC to closed about 90 degrees from #1 TDC. So, the cam is installed correctly and I set the valves right.
What else could be causing this?? I've posted in other threads, and I'm slowly narrowing things out...
So now it's not:
Timing Chain
Crank or Cam gears
Incorrect Valve Lash
I still think it's something to do with the valves, due to the amount of air/fuel mixture that's being kicked out back through the throttle body.
Ideas on this?
Thanks
Colin
------------------
Webmaster: www.IROC-Z.org
Thread
Thread Starter
Forum
Replies
Last Post
