Update: I removed the distributor and replaced it with another new one from
Moss. This new one's timing mark was rock steady. I guess there is something
wrong with the first one I got from Moss and I will be returning it to them.
It has only been in my MGB for 300 miles since my engine rebuild.
Thanks to all who responded with advise.
Ron Fine
----- Original Message -----
From: Paul Hunt
To: Ron Fine ; MG List
Sent: Tuesday, July 08, 2008 3:46 AM
Subject: Re: [Mgs] Unsteady timing
Ron - for a new distributor I'd say that is wrong. I'd expect the light
spring to be under some tension, only the heavy spring should be loose on its
pins. It is this that gives the 'curve', which is actually a knee rather than
a curve as the rate of advance is high initially when only the light spring is
in use, then when the heavy spring comes into play the rate of advance is
reduced. I have had a 'professionally' rebuilt distributor in the past where
there was only one spring inside, it had the incorrect maximum advance stop
(he had ground the number off so you couldn't read it but made no attempt to
grind the stop as well to give the correct figure) and an incorrect vacuum can
for the reference number. I am very suspicious of new or rebuilt
distributors. Even Moss admitted they had been selling distributors with the
wrong curve for years, taking the manufacturers word for it. Eventually they
tested some, found them consistently wrong, and got the manufacturer to
correct it. I wonder how many suppliers would do that?
Paul.
----- Original Message -----
... I tried turning the rotor anti-clockwise. There is a small
degree of slop before the spring pressure is felt and when the rotor is
released it does not return completely to the clockwise stop. The rotor
will move a few degrees counter-clockwise before the spring pressure is
felt. There is no sideways movement. Does that sound correct or is
there
too much play in the rotation?
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