Cylinder head help & other questions - kinda long

[jdbubb@ix.netcom.com (Dan Bubb)]

Well, TDC means simply that a piston is at the absolute top of it's
stroke.  That's why I said "for the purpose of setting ignition timing"
you are interested in cylinder 1 at TDC.
But, yes, cylinder 1 & 4 are at TDC simultaneously so this is a common
mistake to time for 4 instead of 1.
Dan

Ken Bates wrote:
> 
> 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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