cam timing - Team Camaro Tech
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post #1 of 10 (permalink) Old Jan 31st, 07, 08:14 PM Thread Starter
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cam timing

when installing a cam and the dots are dot to dot, cylinder #6 should be at tdc correct? The crank sprocket has two spots where it can slide on so could it be on the wrong one? My car ran before but not like it should. I have spinning the motor over and #6 does not come close to being at tdc whenever the dot is on top. any advice?
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post #2 of 10 (permalink) Old Jan 31st, 07, 09:12 PM
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Re: cam timing

When both Dots 12 oclock = #1 TDC
When Cam Dot 6 oclock and crank dot 12 oclock = #6 TDC

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post #3 of 10 (permalink) Old Jan 31st, 07, 10:50 PM Thread Starter
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Re: cam timing

hmm well my #6 isnt at tdc when the crank dot is at 12
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post #4 of 10 (permalink) Old Feb 1st, 07, 03:29 AM
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Re: cam timing

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Originally Posted by 67camaro02 View Post
when installing a cam and the dots are dot to dot, cylinder #6 should be at tdc correct? The crank sprocket has two spots where it can slide on so could it be on the wrong one? My car ran before but not like it should. I have spinning the motor over and #6 does not come close to being at tdc whenever the dot is on top. any advice?
The #1 and #6 pistons will be at TDC at the same time, so you can install the cam with the dots together for ease of installation. If you want to install the distributor at this time, just set it pointing to the #6 wire.
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post #5 of 10 (permalink) Old Feb 1st, 07, 04:32 AM
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Re: cam timing

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Originally Posted by 67camaro02 View Post
The crank sprocket has two spots where it can slide on so could it be on the wrong one? any advice?
aftermarket crank sprockets come with different keyways to advance/retard the camshaft. Usually there is about a max of 4* depending upon manufacturer of sprocket set.

My suggestion, and I agree with previous posts, would be to use the dot directly over the center of the keyway, straight up.

Chain should be tight, no slack or very minimal amount of slack in the timing chain.

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post #6 of 10 (permalink) Old Feb 1st, 07, 07:11 AM
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Re: cam timing

when cam dot is at 6 oclock & crank dot is at 12 oclock # 6 cyl. should be at tdc on COMPRESSION STROKE.
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post #7 of 10 (permalink) Old Feb 1st, 07, 07:18 AM
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Re: cam timing

That's why if you put the distributor in at this juncture you will have the rotor pointing at the #6 wire/post...
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post #8 of 10 (permalink) Old Feb 1st, 07, 08:25 AM Thread Starter
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Re: cam timing

i think its on the wrong keyway possibly. im gonna feel pretty stupid if it is...
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post #9 of 10 (permalink) Old Feb 13th, 07, 05:00 PM
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Re: cam timing

first get motor to top dead center by doing this pull number 1 spark plug and move crank have another person put a straw like from mcdonalds in plug hole nothing like a screw driver or sharp object it will scrape cylinder wall. till piston comes on top than keyway will be on top also
than cam will line up with it on bottom. than drop distributer in pointing to number 1.
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post #10 of 10 (permalink) Old Feb 13th, 07, 05:23 PM
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Re: cam timing

hmmm.... most aftermarket timing sets have 3 keyways, "straight up" 2 degrees advanced, and 2 degrees retarded.

They are marked with a dot, a triangle, and a square, with coresponding marks at the edge of the gear.

Note that the letway is NOT straight up when #1 & #6 are at the top of the bore, it's off toward the drivers side, with most cars of our years, the keyway is aligned with the tdc mark on the balancer.

So if you want to install the cam "straight up" you slide the keyway that is marked with a dot onto the cranks, then turn the motor as you need to until the "dot" on the outer edge of the gear is straight up.

If you were to accidentally install the gear using say the triangle keyway but the dot on the outer edge, the cam would be WAY off, like 69 degrees or so. It would not run, and probably would put pistons and valve together.

I tried to find the post where I learned all this a few years ago, was a good picture of the cam gear in it, but couldn't find it, sorry.





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