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Valve clearance question

 
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Old 07-29-2014, 02:48 AM
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Valve clearance question

I'm going to be doing a valve adjustment in the next day or 2. In the manual, it says .006-.007 (intake) & .007-.008 (exhaust). Ideally I'd use a .0065 (intake) & .0075 (exhaust), however there is no "half" sizes that re accurate to the ten thousandths... at least not on my feeler gauge. I have .006, .007, & .008 to choose from.

So, what's the best practice? high or low? for intake should adjust them to the .006 gauge or .007, and the same for exhaust in its respective range.

I realize there is a range, but if adjusting properly (intake for example) If I adjust to the .006, then the .007 should not fit in there, right?

Thanks.
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Old 07-29-2014, 07:24 PM
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Re: Valve clearance question

I always adjust to the low side, but there's no particular reason. And yes, if you adjust to a size, the next size up shouldn't fit.
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Old 07-31-2014, 01:09 AM
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Re: Valve clearance question

I was always told that over time exhaust valves get tighter, and intake valves get looser. I don't know if there is much truth to that, my grandfather told me this once, he generally knows what he's talking about. Just something to keep in mind. Maybe go low on the exhaust valves and high on the intake valves?
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Old 08-01-2014, 01:41 AM
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Re: Valve clearance question

Just wondering exactly how much drag there should be when checking with a feeler gauge? In the Honda manual, it says [turn the adjusting screw until the feeler gauge slides back and forth with a "slight" amount of drag]

However, I ran across this post (the quote at the bottom) from another thread, which seems to contradict that. I followed the manual and turned the adjusting screw to a point that "I" felt was a "slight amount" of drag. I used the smallest gauge in the range (.006 intake, .007 exhaust) then after tightening down, I checked with the higher gauge in the range. The higher gauge still went in but had more drag. Finally, I tested with the next size up (past the acceptable range) and it did not go in, or started to just barely slide in, then got stock.

Can anyone who has more experience with doing valve adjustments share their wisdom? Thanks.

Quote:
Originally Posted by 98vtec View Post
you have to have a feel for what the correct spec is.

when you use a .007" feeler gauge, the tougher it is to drag the gauge between the rocker and came lobe the closer to .007 it is. When it becomes so tight that the feeler gauge no longer moves, the clearance is .007. If the .007 is really loose, put the .008" gauge in there and see if it fits. If it fits, the clearance is not in the .007 spec, its above .008"

Last edited by HiGhGuY; 08-01-2014 at 01:51 AM.
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Old 08-01-2014, 08:47 PM
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Re: Valve clearance question

That's a feel you have to develop. Try cranking down until it's snug enough that you can't move the feeler gauge, then loosen up just enough that you can slide it out with a steady drag on the feeler. Then try sliding it back in -- if it won't go back, loosen up a smidge more and repeat.
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Last edited by Jamie; 08-01-2014 at 08:49 PM.
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