<VV> Help!! crank rotation question...

kovacsmj kovacsmj at sbcglobal.net
Sat Oct 29 16:36:33 EDT 2005

It is easy to check piston to head /valve clearance once you have the
heads off. 

 Take a piece of clay or gum and stick it to the piston where it may
contact either the head or the valve or wherever you feel there might be
a problem. 

 Reinstall the head and give it a light torque like 25 lbs.

 Rotate the crank till it goes through a compression and exhaust cycle. 

 Remove the head and measure the thickness of the gum or clay.

 A simple engineers steel ruler measured in thousands can be stuck into
the stuff and you eyeball the measurement. 

 Anybody else got a variation or better method??

Getting all the information is most of the solution.

-----Original Message-----
From: virtualvairs-bounces at corvair.org
[mailto:virtualvairs-bounces at corvair.org] On Behalf Of BBRT
Sent: Saturday, October 29, 2005 12:36 PM
To: Cash Case; Virtual Vairs
Subject: Re: <VV> Help!! crank rotation question...

You might want to make sure you have the same metal "ring" gaskets under
cylinders, make sure all the pistons come up the same amount when you
the crank, so you  can visually  see that one doesn't stick up too far,
some reason.  That all cylinders had a gasket in them. Investigate to
see if 
there is any mark on any pistons or cylinder chamber for interference; 
likewise spark plugs. Are they all the same reach?

I would take the top off the block and look inside and see if rod bolts 
clear studs, in case there is one that was in too far.  But, when you
that head, you may have turned the stud a bit out, so it doesn't 
interfere...  Kind of need to make sure and it will be hard to spot,
something didn't hit.

Chuck S

----- Original Message ----- 
From: "Cash Case" <cash.case at sbcglobal.net>
I rotated the crank and it stop after one
> rotation just like before. I had a 50% chance of getting it right and
> picked the wrong head. So, I rotated the engine around (It's  sitting
on a 
> tailgate.) and took the other head off. again I found  nothing, but
> when I rotate the crankshaft, it goes all the way  around. Problem 
> solved...
> Before I put this thing back together, is there anything I should
> for that might have caused the problem? I checked the valves.  The
> appear to all be where they belong. Maybe whatever it was  fell out
> I was tapping off the head.
> -Cash Case
> _______________________________________________

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