Rotor arm fit?

[Jojax]

Bought two of them now, one red and one black. Both advertised as " Morris minor." Neither of the buggers fit.....too tight.

[minor65]

I have came across the same problem within the last month. I fitted a red one to a friends minor and it was a really tight fit, but it did go on without any modification. I fitted a red one to my minor on Tuesday (as the Lucas boxed black one which was only 3 years old failed), it was a bit tighter than the old one but it wasn't to bad !! The red rotors seem to be the most reliable at the moment.

[Jojax]

Hmmm.....I didn't want to try to force one on. Thought I must just have bought the wrong size (twice). Lol.

[katy]

Try putting it in very hot water for a few minutes before trying to put it on. That should expand it enough to make it slide on easier.

[Jojax]

the black one went on with a little persuasion.

[bmcecosse]

And it will fail in no time at all. Inspect the red one - and if 'nearly' correct just carefully file it till it fits snuggly. Loose is useless....it must be snug, but not so tight it needs 'heating' or force - that will only crack it!

[Jojax]

Never had a rotor fail on me before. What happens......does it physically break apart? Better carry a spare.

[bmcecosse]

Fit the red one...by all means carry the black as a spare........

[Jojax]

Red one fitted. Just as well I have electric light in the garage.

[dalebrignall]

ive had to make the red ones fit bit of scratchy paper on the inside of the rotor arm had a few burs where it was moulded

[GBond]

Mine failed not too long ago; not a clue externally so it took quite some time to diagnose the problem.
When it was removed you could notice it was a bit brown on the inside but nothing more, yet all the sparks were earthing through the distributor shaft. I fit a red one and they are indeed a much tighter fit.