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post #1 of 7 (permalink) Old 03-27-06, 04:42 AM Thread Starter
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valve clearance

i need help setting my valve clearance , ive bleed down the lifters and im getting around 6.5mm gap , what should the gap be , and how can i adjust the clearance , do i need different push rods or can i shimm the pedestal to get the desired clearance ,,

im using standard rocker arms ,
the heads and block have been shaved too
the push rods im using are crow cams 8.400"

any help appreciated

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post #2 of 7 (permalink) Old 03-27-06, 04:47 AM
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Re: valve clearance

Quote:
Originally Posted by krusty
i need help setting my valve clearance , ive bleed down the lifters and im getting around 6.5mm gap , what should the gap be , and how can i adjust the clearance , do i need different push rods or can i shimm the pedestal to get the desired clearance ,,

im using standard rocker arms ,
the heads and block have been shaved too
the push rods im using are crow cams 8.400"

any help appreciated
What do you mean you need help setting valve clearances,if you are using hydraulic lifters then it will self adjust,on the other hand if you are using solid lifters then have you got an adjuster on the rocker.

The 6.5 mm you talk about is just the amount of internal travel the lifter has.

More info required.

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post #3 of 7 (permalink) Old 03-27-06, 05:05 AM
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Re: valve clearance

Don't measure the gap, but rather how far it presses or preloads the plunger in the lifter after the rocker is bolted on. Just bolt the rocker down when the lobe is on the base circle, then the pushrod should push into the lifter between 20 and 60thou or 1/2 to 1.5mm. Don't worry how much play it has afterwards, but how much "preload" it has into the lifter. If you have between 20 & 60 thou preload, all is good and it will sort itself from there.
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post #4 of 7 (permalink) Old 03-27-06, 05:42 AM Thread Starter
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Re: valve clearance

im actually having a bit of air blowing back through the carb , no its not back firing , in the factory manual it says that when you shave the heads or regrind the valves that an adjustment has to be made or the valves can stay open
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post #5 of 7 (permalink) Old 03-27-06, 06:07 AM
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Re: valve clearance

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Originally Posted by krusty
in the factory manual it says that when you shave the heads or regrind the valves that an adjustment has to be made or the valves can stay open
Thats why you check the PRELOAD and make sure it is between the allowed specs, then it can't be wrong. What is your preload into the lifter??
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post #6 of 7 (permalink) Old 03-27-06, 07:10 AM Thread Starter
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Re: valve clearance

sorry about the dumbass questions , but how do you check the preload and what actually is preload
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post #7 of 7 (permalink) Old 03-27-06, 02:42 PM
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Re: valve clearance

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Originally Posted by krusty
sorry about the dumbass questions , but how do you check the preload and what actually is preload
Read post #3 as it gives a basic idea.
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