Jonathan,
For all 4 cycle engines I am pretty sure ( taught this in
Engineering school) that the crank and cam are geared so that the crank turns
two revolutions for one revolution of the cam. So what you have said about
the timing below follows the rule. I think that either of your gears could be
marked 180 deg out or installed wrong. You need to check new gears against
old gears and new crank and cam against old. This would entail a minor tear
down by removing the gears and camshaft to check. Better be safe than sorry
later.
Jerry
BN2
From: Jonathan Quandt <jfaquandt@comcast.net>
To:
healeys@autox.team.net
Sent: Thursday, October 25, 2012 7:15 PM
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
$12.75
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