Holding cams in place - ZX6R Forum
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post #1 of 9 Old 03-11-2017, 05:29 PM Thread Starter
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Holding cams in place

OK so what's the secret for holding the cams in place while putting the carriage back on. Well while tightening it down.

Since a set of intakes and exhaust are being pushed down they want to rotate.
So with the chain and cam's in place, when I start getting the carriage down the cams want to rotate.
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post #2 of 9 Old 03-11-2017, 06:32 PM
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The tightening sequence of the plates in the manual is key. I was sketched myself about the cams moving around, but when I followed the sequence it placed the cams just right. I went through the sequence incrementally and the third time around I torqued them to spec. First time around was finger tight, next was 52 in/lb, and last to 106 in/lb.
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post #3 of 9 Old 03-11-2017, 06:56 PM Thread Starter
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Quote:
Originally Posted by MotoCT View Post
The tightening sequence of the plates in the manual is key. I was sketched myself about the cams moving around, but when I followed the sequence it placed the cams just right. I went through the sequence incrementally and the third time around I torqued them to spec. First time around was finger tight, next was 52 in/lb, and last to 106 in/lb.
Well I must be doing something wrong then.
I have tried several times and they rotate as I tighten them down.
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post #4 of 9 Old 03-11-2017, 07:16 PM
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It doesn't matter that they move..... If the cams are indexed on the timing chain correctly, they will end up where they are meant to be.

It won't be correct, until the tensioner takes out the slack on the timing chain. Well after you torque all the caps in place.
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post #5 of 9 Old 03-11-2017, 07:20 PM
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They will rotate, you can't stop it. When you tighten the plate down you start to compress the valve springs. This causes the cams to rotate. You have to compensate for that as you're timing the cams. The exhaust cam kept moving on mine, plus you can't really see the timing mark on the 05-06 exhaust cam due to the frame. I had to line the exhaust cam so the alignment mark was just below the cylinder head edge. Once you think you have it right and tight, rotate the engine a minimum of 2 full turns by hand before you try to engage the starter.
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post #6 of 9 Old 03-11-2017, 07:24 PM
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BTW, next time make reference marks on each cam gear to chain and crank gear to chain. Takes all of the guess work out of timing the engine.
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post #7 of 9 Old 03-11-2017, 07:48 PM Thread Starter
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Quote:
Originally Posted by Elwood View Post
BTW, next time make reference marks on each cam gear to chain and crank gear to chain. Takes all of the guess work out of timing the engine.
I did,,
Put the cam's in. Aligned with the marks before taking them out.
But as I tighten the carriage down the chain is loose enough to allow the cams to rotate from the marks made before starting.
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post #8 of 9 Old 03-11-2017, 08:31 PM
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Quote:
Originally Posted by Indy View Post
I did,,
Put the cam's in. Aligned with the marks before taking them out.
But as I tighten the carriage down the chain is loose enough to allow the cams to rotate from the marks made before starting.
As mentioned by others above, this is normal. Once everything is tightened down, the cam chain tensioner has been installed, and the engine rotated a couple times, everything will fall into place properly.
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post #9 of 9 Old 03-12-2017, 05:26 AM
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Quote:
Originally Posted by RJ2112 View Post
It doesn't matter that they move..... If the cams are indexed on the timing chain correctly, they will end up where they are meant to be.

It won't be correct, until the tensioner takes out the slack on the timing chain. Well after you torque all the caps in place.
This.

Make sure you use assembly lube on the cam journals and that you rotate the engine by hand (in the correct direction) a few revolutions after you have buttoned everything up to allow the cam chain to align and the tensioner to spring to its normal location.
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