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_Shmity_
Valve clearance question am i loosing it?
#1
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in the 1973 Nissan Factory Service Manual:

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

wouldnt the metal expand as it gets hotter and therefore it would have a smaller gap rather than larger.

Posted on: 2007/7/17 10:42
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Mildman
Re: Valve clearance question am i loosing it?
#2
No life (a.k.a. DattoMaster)
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The wiki agrees....thus it must be right!

http://wiki.datsun1200.com/index.php/Valve_adjustment

Posted on: 2007/7/17 10:47
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MLS
Re: Valve clearance question am i loosing it?
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You're on the right track, however it is the valve head that expands the most therefore pulling the stem further away from the rocker.

Posted on: 2007/7/17 10:47
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Dodgeman
Re: Valve clearance question am i loosing it?
#4
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Quote:

_Shmity_ wrote:
in the 1973 Nissan Factory Service Manual:

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

wouldnt the metal expand as it gets hotter and therefore it would have a smaller gap rather than larger.
Which metal would that be.

Head. ... Gets taller
Cylinder block. ... Gets taller
Valve stem. ... Gets longer
pushrod. ... Gets longer
Tappet. ... Gets taller
rocker pedestal. ... Gets taller

The growth of the various components tends to cancel each other out to some degree & in the end, its all good.

What they do during engine development is to get the tappet clearance right when hot, then measure it when cold.
This works on the reasonable assumption that it will come out right when it is at operating temp again.

If you are reassembling a new engine, or reinstalling a head, use the cold setting as a get-you-going setting & reset the tappets when the engine is properly hot for best results.

Posted on: 2007/7/17 11:00
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_Shmity_
Re: Valve clearance question am i loosing it?
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okay cheers, see how i go

Posted on: 2007/7/17 11:56
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