My suggestions re. distributor bushings turn out to be flawed as follows:
The Lucas units on Alpines (and others) have no top or bottom bushings and
the shaft rides in the alloy housing. Sorry about that error. Guess I am
looking at too much different car stuf sometimes.
However, the cure is still along the lines I mentioned.
1. Have the loose shaft plated with hard chrome to build it up, then lap it
into the housing bore using fine valve grind compound or suitable material.
2. bore out the top area of the dist housing and insert a custom made
bronze bushing to suit the bore as well as the shaft sizes.
In either case, watch for oiling grooves and channels and make sure they
are replicated.
The lower end of the dist shaft usually has zero wear as it rides low and
catches lots of oil splash and hence we likely have no wobble at the lower
end to worry about.
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The four sided cam may have wear causing it to fire some cyl. at angles far
away from the required 90 deg. intervals. Running the dist on a test bench
machine will display the exact fireing angles and show if a new cam is
needed. Also you can rev up the dist to some rpm (X 2 equals crank rpm)
and see how fast your engine "could" rev before point float would cause
misfiring. With normal compressions and a dist which fires within say 2
deg. of 90 deg on each cyl. you will have a smooth idle engine and one
which is able to produce it's best HP.
-----------------Dick T.
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