Cylinder head help & other questions - kinda long

[indiana_red@hotmail.com (Ken Bates)]

RE: the last comment on prev post.
umm Isn't TDC mean not only top but top on the compression stroke.  Which
would mean that if cyl #1 is there then #4 would be at the top of the EX
stroke.  This is how at first you can accidentally be 180deg out if your not
carefull.  Not being a "nay-sayer" just making sure I understand it as
well...
Ken
'79 Scirocco 16v project "McFly"
"...it's working...It's Working...!!"
'86 16v (parts car)
VORTEX:  "Indiana Red"

----- Original Message -----
From: "Dan Bubb" <jdbubb@ix.netcom.com>
To: "Mark Mages" <wasserbox@yahoo.com>
Cc: "Scirocco List" <scirocco-l@scirocco.org>
Sent: Thursday, July 11, 2002 10:09 AM
Subject: Re: Cylinder head help & other questions - kinda long


>
>
> Mark Mages wrote:
> >
> > Well - I figured out what I think was the problem with
> > my car getting too hot, then not running at all
> >
> > Incorrect cylinder head gasket.
> >
> > 1st off - it is an 84 8v.  The cyl head has a big H
> > stamped on it.
> >
> > The one P'man sent me looks correct on first glance,
> > but when I pulled the head (60/60/80/80 compression) I
> > found that the holes in the head and the holes in the
> > block don't match the holes in the gasket.  I have
> > semi-triangular and crescent shaped holes around the
> > cylinders and the valves, and the gasket has all round
> > holes that are smaller than the holes in the engine.
> > I am guessing that these are the oil air and coolant
> > circuation holes, and the restriction is what was
> > causing it to not run.  PLEASE correct me if I am
> > wrong, but the gasket should match pretty much exactly
> > all the holes on the block and in the cyl head, right?
>
> Most head gaskets will have round holes for the coolant passages in the
> head gaskets. There needs to be some restriction here to quarantee
> coolant is flowing thru all of the block and head. I doubt this is your
> problem.
> >
> > Now - the guy at the shop told me to check for burnt
> > piston rings by leveling the pistons and pouring
> > solvent down the cylinders.  He said that it should
> > take 2.5 to 3 hours for it to drain through the engine
> > if the rings are good.  What kind of solvent should I
> > use?  Is acetone too much?  Should I pull the pan and
> > oil pump, or will they be all right if I leave them
> > in?
> >
>
> I've never heard of this before, but don't know anyway to test leakage
> with the head off the block.
>
> > How do I tell if my cylinder head valves are burnt?
> > there is carbon on the bottom of the head, but it
> > doesn't look like anything is especially damaged.
> > Should I disassemble it?  Anything in particular to
> > look for?  Is there any way to pressure test the
> > cyinder head to see how much compression I am losing
> > in there?
>
> Set the cylinder head on it's side with the ports facing up. Pour
> gasoline into ports where the valve is fully closed. If you see any
> seepage into the combustion chamber the valve will need to be lapped or
> reseated.
> >
> > One other thing - TDC is with the 1 & 4 pistons fully
> > raised, not 2& 3 right?  2& 3 would be TDC on the
> > exhaust stroke....
>
> TDC for the purpose of setting ignition timing is with 1 & 4 at TDC.
> >
> > That's it for the moment.  Thanks!
> >
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