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AU head tapping help diagnose this video 

 

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 Post subject: AU head tapping help diagnose this video
Posted: Wed Jan 21, 2015 10:12 pm 
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Age: 30

Posts: 159

Joined: 13th Dec 2008

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Ride: AU Wagon/ 1967 XR

Location: Melb East
VIC, Australia

As described Au valve train is tapping like mad, been through the woes like everybody else copied and tried countless efforts to no avail.
There seems to be zero clearance on the valve yet it makes that tap sound the worst when fully closed. It does get better when fully open to almost gone but just not quiet as solid as other cylinders in same position.
Stage 4 CMS head and cam profile to my knowledge is fairly new and possibly just run in is there a chance the spring has settled and is now needing more shimming? It's only got 2 factory ford shims when I thought some people would run one factory and one custom shim which is a bit fatter.
Also I think the motor sat around for quite some time before I bought it put it in and started it, is there a chance the spring on that valve/ cylinder has been compressed in that position for extended period of time it's now gone a bit soft?


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 Post subject: Re: AU head tapping help diagnose this video
Posted: Wed Jan 21, 2015 11:31 pm 
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Joined: 7th Nov 2004

Ride: ford falcon au3 xr8

Location: a shit suburb in sydney
NSW, Australia

I would say it doesn't have any preload or enough pre load on that rocker..
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