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valve clearance and adjustment questions

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subaeroux
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2012/05/19 23:29:22 (permalink)
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valve clearance and adjustment questions

Hello,

I have removed both my 264 HKS camshafts in my 3sgte from a 1990 SW20. The intake camshaft I have removed as I intend replacing it, as there were issues with the cam lobes. On one of the shims there is this issue as shown in this image:

http://img177.imagevenue.com/img.php..._122_221lo.jpg

The BGB does the valve adjustment with the camshafts attached, so would I need to reinstall the intake cam that has the lobe problem,which caused the indentation as shown above (the rest of the shims are flat). How would i go about measuring the clearance of that particular shim properly?

Another thing the valve adjustment requires me to do via the BGB is to adjust the pulley to TDC by lining up the crank pulley with the marks on the lower timing belt cover. However, I have removed the pulley, the timing belt and cam gears in order to inspect and remove both camshafts. Is there a way of lining the keyways (where the timing belt guide only slides one way onto) upwards with no crank pulley installed to get TDC, or do I have no choice but to do the valve alignment after the cams are installed, including the old one, in order to get the correct clearance, and do I then have to remove everything again in order to install the new cam?

Will i have to remove the shim when the cam is actually installed as it shows in the BGB, or can I do it while everything off which would be vastly superior if there is a way as putting things on and taking them off is a pain? Obviously if I have to I will, but it would be greatly appreciated if anyone has ideas.
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    just_ace
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    Re:valve clearance and adjustment questions 2012/05/20 13:00:19 (permalink)
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    you should've measured the clearances prior to removing the cam using feeler gauges.
     
    that way you would be able to then measure what size shim was in their and find a thinner/thicker shim to replace that would bring the clearances to the desired specs.
     
    unless you have the SST you'll need to remove the camshaft in order to fit the correct shim.
     
    re: crankshaft. that's more so if you have the timing belt attached, as you have removed it just turn the crankshaft until the pistons are all approx halfway in the bores. then just turn each camshaft individually to measure clearances on each lobe etc.
    #2
    Road and Track
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    Re:valve clearance and adjustment questions 2012/05/24 07:55:59 (permalink)
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    damaged shims are common and often the matching buckets and cam lobe is also damaged.
     
    only do 1 cam at a time, beacuse high lift cams can cause the valves to hit each other and bend. keep one cam "loose" while doing the other one
     
    as jsut-ace said, put all pistons mid stroke before you attempt to set the clearances
     
    the HKS cams may have different clearances to stock
     

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