Hi Mark,
Okay I'm following you except where do I smear the Vaseline exactly?
I smear the Vaseline on the valve seats when the valves are up yes? Just
enough to seal the valve but not gook up the combustion chamber? Then I put
a light coating on the head surface to get the plexi to seal without getting
any in the chamber. Okay I think I got it. I am still scared to turn the
cam by hand though....How do I know its lubed? The machine shop that redid
the head should of done that when they re-assembled right?
Yep I have some burettes and syringes in my Halloween stash that I
have been saving for just this occasion.
I just discovered that I have tomorrow off so I want to try to do
this then.
Daniel Neuman
Oakland CA
$-----Original Message-----
$From: Mark Sedlack [mailto:msedlack@neo.rr.com]
$Sent: Thursday, November 10, 2005 10:55 AM
$To: Daniel Neuman; datsun-roadsters@autox.team.net
$Subject: Re: CC'ing a head
$
$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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