redline9570

I got this off of Shoeboxs site and got me a little confused.
"%u2022Install cam sprocket and timing chain. (1/2" bolts - torque to 18 lb. ft. I used some red thread locker on them) Line up the dots on the timing gears. 12 o'clock for the crank gear and 6 o'clock for the cam gear. This will put the cam dowel at 3 o'clock and #6 TDC."

I put my crank hub with mark (arrow) on top, took off the timing chain cover and my cam dowel was sitting at 9 o'clock position which would put #1 @ TDC. Now if I use Dot to Dot method and NOT turn the crank wouldn't that make my timing 180 out?

Chet1185

Just rebuilt my engine and i'm pretty sure the #1 cylinder had to be tdc with the cam dowel at 9 O clock. I can't remember exactly but I believe it hit 9 o clock one other time before cylinder 1.




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Chet1185

I'm no expert and don't really remember everything I did while building it so I may sound pretty dumb.


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redline9570

No worries, perhaps I should try to explain it better. I did a cam swap and when I pulled the cam the dowel was at 9 o'clock. A few days later I go to install a new cam and I refer to shoeboxs site which states to put cam dowel @ 3 o'clock and line up dot to dot (and other sites as well) wouldn't this throw off the timing 180?

shoebox

No, it won't make it 180 out. It will be perfectly in sync. The crank rotates twice for every revolution of the cam. So either 1 or 6 is going to be at TDC compression when the crank dot is at 12 o'clock. Look at the cam timing animation. Had you rotated the crank another 360 degrees until your hub mark was again on top, you probably never would have even asked this question.

redline9570

When at #1 TDC you can adjust the following valves:
Intake: 1, 2, 5, 7
Exhaust: 1, 3, 4, 8
Rotate the crank one revolution until the pointer is again at 12 o'clock. This will let you adjust the remainder of the valves. If you did #1 the previous time, you should be now at #6 TDC.
When at #6 TDC you can adjust the following valves:
Intake: 3, 4, 6, 8
Exhaust: 2, 5, 6, 7

I got that off your site, so looking at this, it would matter which one #1 or #6 is at tdc. Sorry for the confusion but this got me to ask. If #6 is at tdc and I can only adjust intake valve 3,4,6 and 8 which would put cam dowel in the 3 o'clock position, then intake 1,2,5 and 7 can only be set with cam position at 9 o'clock I thought that would of thrown off the timing. So now if I go back and set my marks dot to dot I would have to follow #6 tdc to set valve lash even though #1 is tdc now?

shoebox

Dude you are confusing me.

1 and 6 are never at TDC compression at the same time. The pistons are both at the top at the same time, though (as the same as every other pair of cylinders). The cam timing animation should have made it clear about dowel position and TDC. It is the cam position that determines which cylinder is at TDC compression.

Dot to dot is #6 TDC compression. Both dots at 12 o'clock is #1 TDC compression. I guarantee you that nothing in the valve adjustment guide is wrong. Just follow it.

redline9570

I am confused lol, I wasn't saying there is anything wrong with the directions. I find your web site very useful and the best out there, but if I pull my cam when the dowel was @ 9 o'clock and not rotate the engine then put it back @ 6 o'clock that will not affect timing since it's "cam position"?
Thanks =)

shoebox

The dowel position will be at 3 or 9. The dots will be either together or vertically aligned at 12 o'clock. Either is good and proper. Just look at the cam timing animation.

You can take out the cam and use as a majorette's baton, but when you put it back you line up the dots on the gears and you are good to go.