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#1 valve clearance help
brod1200 Posted on: 2008/7/11 1:44
hey i have changed cam and added double valve springs but the tappets are nopisy just wondering if the clearances are meant to be the same as normally thanks
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#2 Re: valve clearance help
ddgonzal Posted on: 2008/7/11 3:29
The cam vendor can tell you. Give them a call.

For standard clearance, use 0.013 inch cold.
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#3 Re: valve clearance help
A14force Posted on: 2008/7/11 9:10
my book says .010 cold, and .014 hot.
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#4 Re: valve clearance help
frankthedolphintrainer Posted on: 2008/7/11 9:13
the cam would be causing it to be noisier
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#5 Re: valve clearance help
ddgonzal Posted on: 2008/7/11 17:10
Quote:
my book says .010 cold, and .014 hot.
Yes the early Nissan book had it incorrect.

Quote:
From the 1973 Nissan Factory Service Manual:

COLD: 0.25 mm (13 thousands inch)
HOT: 0.35 mm (14 thousands inch)

NOTE: The 1971 manual has the cold specification incorrect.
Valve Adjustment
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#6 Re: valve clearance help
A14force Posted on: 2008/7/11 22:25
Actually, I was quoting a my Haynes manual.

When they ground your cam they will have removed material from the base circle. That'll make your tappets noisey.
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#7 Re: valve clearance help
brod1200 Posted on: 2008/7/12 0:26
so is there anyway of quietin them down a bit
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#8 Re: valve clearance help
ddgonzal Posted on: 2008/7/12 5:37
Quote:
is there anyway of quietin them down
Yes, adjust them to spec. Even 2 thousands inch loose and they make tapping noises...
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#9 Re: valve clearance help
A14force Posted on: 2008/7/12 8:51
Quote:

ddgonzal wrote:Yes, adjust them to spec. Even 2 thousands inch loose and they make tapping noises...

I'm Not sure about that one either. I've had a couple of cams reground, (lumpy nasty grinds) and the grinder's specs for tappet clearance have been .016. They haven't been noisy. On a really nasty motor the extra lash can allow the valve a whisker more "seat time" to aid heat transfer.
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#10 Re: valve clearance help
ddgonzal Posted on: 2008/7/12 17:28
Yes, that's right. They should be adjusted to the cam grinder's specifications. For a stock camshaft, there should be absolutely no tappet noise (not even a faint little bit) if adjusted to Nissan's specifications.
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