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Acceptable cam and cam gear run out?


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#1 klevliend

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Posted 08 April 2021 - 08:56 AM

Hi all, looking for some help

 

I am doing my first holden 6 rebuild and just following the instructions in my HR holden factory manual. 

 

I have installed Crank, rods & pistons and camshaft and am now checking the cam runout and the cam gear runout. The book says acceptable cam runout is 0.003" and cam gear runout 0.004". I have checked mine with a dial indicator but my cam runout is 0.006 and the cam gear 0.011. 

 

It is a new crow cams cam but with the old used cam gear pressed on. 

 

Obviously the book says clearly what acceptable runout is and that mine is over but my question is: is this one of those things were the book says its a rule but its more like a guideline???

 

Is this worth taking the cam back out and re-pressing the gear back on (or possibly replacing it) or is this one of those technicality things but really it isn't going to make a difference. Its my first time doing this so looking for some guidance. 

 

Cheers



#2 73SUNBURSTEXYOUWON

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Posted 08 April 2021 - 09:07 AM

IMO - I would have used a New Timing Gear set. Reused timing gears on cams have a tendancy to walk off.

#3 hawk

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Posted 08 April 2021 - 11:05 AM

Might be a silly question but is your dial indicator imperial or metric? may account for the run-out if looking at microns.

#4 klevliend

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Posted 08 April 2021 - 12:21 PM

It is an imperial dial indicator. 

 

And yeah, kind of wish I'd bought a new set of timing gears now... 



#5 claysummers

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Posted 08 April 2021 - 06:10 PM

Not to late and you better be using a helical cut alloy or steel gear, not the fibre one. First thing to go on those motors. And never mind the straight cut gear, just makes an annoying noise.

early Holden nut

Edited by claysummers, 08 April 2021 - 06:12 PM.


#6 klevliend

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Posted 08 April 2021 - 08:23 PM

Yeah, after mulling it over all day I reeeeaaaalllly wanna just send it. Have spent all day trying to convince myself 'she'll be right' and wondering whats the worst that could possibly happen?

 

But couldn't do it, will be getting new timing gears for it I think. 






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