Hi Chris
Yes it is possible to mismatch the rotor and cap!
I just got a replacement rotor arm and when I was going to fit it I noticed
it was considerably shorter than the previous one, this was possibly my
fault as I quoted the numbers from an old invoice at my local Lucas outlet
and they supplied what I asked for, you may think they should have pointed
out any incompatibility, but I am well known locally as THE Truimph bloke,
as I have quite a fleet and often buy bits for multiple cars! I have yet to
correct this situation, I just kept the old cap and rotor arm. You should be
able to get the correct rotor arm, you may need to get them to do a number
change check, a lot of parts guys remember these numbers from deep within.
Gap should be as small as possible (measured in thousandths not sixteenths)
as you really want the power of the spark to go to jumping the plug gap not
the rotor to cap gap.
Something else to look out for is the way the rotor arm is constructed, my
version of rotor arm hell is walking about 5 miles home from the middle of
no where at two in the morning after I had a new (that day) rotor arm fall
in two, this was the type with a brass rivet to hold the contact piece to
the bakelite and it split right through the rivet point.
If you had said you had a small gap and lots of broken rotors I would have
suggested that your distributor had too much play in the spindle, this is a
common eater of rotor arms but obviously not your current problem.
Graham
2.5PI MKII
2000MKI
Dolomite Sprint
Toledo
1300 FWD
----- Original Message -----
From: "Christopher Hinge" <chinge@postmaster.co.uk>
To: <2000-register@autox.team.net>
Sent: Wednesday, May 29, 2002 9:06 PM
Subject: Rotor arm hell
[demime could not interpret encoding binary - treating as plain text]
---------- Forwarded message ----------
Date: Wed, 29 May 2002 21:01:00 +0100
From: "Christopher Hinge" <chinge@postmaster.co.uk>
To: 2000-register@autox.team.net
Subject: Rotor arm hell
Hi all
I'd very much appreciate your help with a problem on my 1970 mk 2 PI.(25D
distributor) She has a huge appetite for rotor arms and has chewed her way
through 4!!! in the last 6k miles. The same fault every time, tracking
through to the dizzy shaft.
Changed the usual plugs, leads etc but no cure.Fiddling around today I
noticed that the clearance between rotor arm
tip and dizzy contacts is about 8mm (5/16 inch)
Anyone know what it should be?- seems a bit much to me.
Is it possible to mismatch arm and cap?
Or, any other thoughts on the probable cause.
Best regards
Chris Hinge
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