GM / General Motors: How do you adjust valves

I have always just put the piston at TDC and loosen the rocker arm nut then
tighten until there is no play in the pushrod. Then tighten an aditional 3/4
turn.

Steve

"Weedahoe" <net> wrote in message
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That all depends on the engine. On my 3.1 there is no adjustment, just
tighten and torque.

"Weedahoe" <net> wrote in message
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"Weedahoe" wrote
 
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What engine are you talking about? There are few, if any engines that
GM uses anymore that can have their valves adjusted.

I'll assume that you are probably talking about a small
block chevy. The easiest way to adjust valves on
these engines is to set the engine to #1 TDC and
adjust these valves.

With the engine in the number 1 firing position, adjust the exhaust valves
for cylinders number 1, 3, 4, and 8 and the intake valves for cylinders
number 1, 2, 5, and 7.

Turn the engine one complete revolution which will put the
engine at #6 TDC and adjust these valves.

With the engine in the number 6 firing position, adjust the exhaust valves
for cylinders number 2, 5, 6, and 7 and the intake valves for cylinders
number 3, 4, 6, and 8.

You can find this information in any half decent manual.

The other option is to turn the engine over until each cylinder comes
up on it's particular TDC, and adjust each cylinder individually, but
this is just a waste of time and it is not a better way to do it. The
first option I gave you is the factory manual method and it's been
that way for years.

The one other option is to adjust them while the engine is running,
but with newer small blocks, this method is really messy and there
is no particular advantage to doing it this way.

Ian

well this is an Olds 350 with a high lift cam and Comp cams adjustable valve
train
"clevere" <net> wrote in message
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valves 

"Weedahoe" wrote
 
valve 

Well, that certainly changes things. I'd suggest that you
do each cylinder separately, and perhaps you might also want
to consult the builder of this adjustable valve train and
see what they recommend.

Ian

Hydraulic valve lifters actively 'take up the slack' and won't require
adjustment, if there is no hydraulic lifter, the valves can be adjusted,
after a certain mileage or if you hear a 'noisy valve'.

Of course, you must find what the adjustment spec is, do not just tighten it
down. There is usually a certain clearance to allow for full closure of the
valve (essential to disappate the heat in the valve) and to allow for warm
up expansion in the parts. You will normally be putting in a feeler guage of
say 6 or 10 thou. This may be different for the exhaust and intake valves.
Do not adjust your valves unless you know what that spec is supposed to be.

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