Daniel,
You'll need a piece of 3/16 or thicker plex, large enough to cover the
combustion chamber. Dril a 1/4" hole, centered. Rotate the cam by hand (
be sure its lubed, and a piece of wood as a lever helps) until valves for
chamber you're checking are closed. Fixture, prop, brace, whatever, to get
the sealing surface level. Get a graduated cylinder, a burrette with hose
and valve or a very large syringe ( might have one in your Halloween
stuff??)
Smear a thin coating of vaseline around the valve seats - just enough to be
sure they are completely sealed. Wipe away excess. Use 100 cc of isopropyl
alchohol, tinted with a drop or two of food coloring. Smear a thin coat of
vaseline on the sealing surface of the head, close to, but not right up to
the edge of the chamber. The idea is to get the vaseline seal, without
getting any in the chamber itself.
Press the plex down onto it, twisting slightly to seat it. Carefully pour
or drip the alcohol into the 1/4" hole, till the level comes up flush with
the bottom of the hole. The clear plex lets you know when its full with no
air. Subtract the number of cc left in the burrette from the starting
100cc, and you're done.
Mark Sedlack
ZROC
Cuyahoga Falls OH
66 1600 http://www.mildevco.net/chevypowereddatsuns/
77 280Z http://www.mildevco.net/chevypowereddatsuns/
----- Original Message -----
From: "Daniel Neuman" <neuman@radonc17.ucsf.edu>
To: <datsun-roadsters@autox.team.net>
Sent: Thursday, November 10, 2005 1:25 PM
Subject: CC'ing a head
> Hello All,
> I need to actively start to put my engine back together. I had the
head
> re-done but I know its too thin. I want to cc my heads so I can figure
out
> how thick of a head gasket I need to bring the compression down to about
8-1
> and to restore the correct valve train geometry. Has anybody ever done
this
> before and would you please give me some guidance.
> I understand that you fill the combustion chamber up with a measured
> amount of light oil and that it helps to put a piece of flat glass over
the
> head to know when you have really exactly filled the chamber.
> So how do I do this exactly? I imagine I will have to figure out a way
to
> mount the head to my workbench and to get/keep the head perfectly level. I
> am also going to need to turn the crankshaft to close all the valves. How
> do I do that when the head is off the engine and sitting on my workbench
> (without screwing everything up??).
>
> Thanks,
> Daniel Neuman
> Oakland CA
> 69 2000
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