Thread: distributor cap & rotor arm/button how often to change?

I was thinking its probably about a year since I fitted a new OEM cap and rotor arm.
How often should these be changed?
I looked on the service sheet but it doesn't mention them.

Originally Posted by HangOver

late reply, I'm still not getting email notification for posts :-/

thanks for that though 100k minimum wow, that's a lot of K's for a set of contacts, but good news :-)

Not so much now but many years ago I used to give the arm and cap a light wipe with emery paper, it seemed to help.
I just replace the cap these days though.

I wouldn't expect a set of contacts to last that long. The heel wears as well as the contact faces. The most important thing is to ensure you have a ballast resistor between the coil and the dizzy. Some coils have it inbuilt, eg Bosch GT40R.This drops the voltage across the points and reduces erosion of the contact faces. You haven't stated what year your Landie is, and whether it was all Lucas electrics ex factory.
Have a look at www.distributordoctor.com - not cheap but worth it