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Join Date: May 2018
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cam timing - punch marks

Everything I've read says that to time the cams that the punch / 930 / woodruff key should start off at the top.

As you can see I have all 3 at the top here. Im just wondering what the extra punch mark is for on the left hand side?

I know I have 3 out of 3 at the top, so i should be pretty safe - but the extra punch mark has me a little paranoid.

Old 03-10-2019, 03:41 AM
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The quick reference punch mark is always at the factory keyway, start at Z1 with both keyways up, pin them to the sprockets and begin the timing process and set it with a dial indicator and/or degree wheel.
Mike Bruns
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Old 03-11-2019, 05:02 AM
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Quote:
Originally Posted by MBruns View Post
The quick reference punch mark is always at the factory keyway, start at Z1 with both keyways up, pin them to the sprockets and begin the timing process and set it with a dial indicator and/or degree wheel.
Mike Bruns
Thanks Mike. Is it possible the extra punch was done by the shop that ground the cams to show they have been reground?

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Old 03-12-2019, 03:15 AM
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More than likely someone punched the parts thinking they could just put it back that way, cam grinders usually stamp grind numbers and dates to identify
Mike Bruns
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The two most useless things to a driver are the braking distance behind you and nine-tenths of a second ago.
Old 03-12-2019, 04:10 AM
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