Jonathon,
A point of clarification: when you set the camshaft to "on the rock" on the
number four cylinder you are setting it so that both of the valves on number
four are closed. In other words you are setting it so that number four
cylinder is on the compression stroke. That means that the cam and crank will
by definition be 180 degrees out because timing is normally taken on the
number one cylinder. I believe that the convention to set the "rock" on the
number four cylinder is so that when that setting is done you can turn the
crank in the running direction one full turn and the timing chain will be
properly tensioned. At that point you will also find that the cam and crank
are back in time. Any manufacturing variation at that point will be obvious.
This of course is predicated on the assumption that the crank was truly at top
dead center when you started and that you were able to accurately determine
that cam was in the "rock"position. There are various methods of finding these
positions.
Bill Lawrence
BN1 #554
> From: jfaquandt@comcast.net
> To: healeys@autox.team.net
> Date: Thu, 25 Oct 2012 17:15:08 -0700
> Subject: [Healeys] Cam and crank gear timing update
>
> I have set #1 to TDC and revolved cam so that #4 cylinder valves are
> on the rock, #1 valves are fully relaxed but my cam gear timing mark
> is 180 degrees out as though the camshaft keyway is cut 180 degrees
> out. I
> decided to pull the timing cover after checking the cam timing
> according to Norman Knok's instructions in his tech talk manual and
> finding that rocker clearances on valves #7 & #8 were obviously
> different after undertaking the test indicating that cam timing was
> 180 degrees out. When I revolve cam so that timing mark matches crank
> gear mark #1 and #2 valve are on the rock, again, indicating that cam
> shaft keyway is maybe cut 180 degrees out. Have I miss read this and
> it is really my brain that is 180 degrees out. Cheers, JQ
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