I removed the oil tank today and checked it, there’s no problem as far as I can tell. End float is .010” on layshaft and selector shaft. I’m feeling pretty confident with it, but I’ll keep an eye on the oil anyway. I’ve ordered some magnets for the sup plugs to make it easier to check.

email (option): Micah.leinonen@gmail.com

This is a gearbox life extender.

https://pesltd.uk/?product=28-0043

Mark

email (option): pes.sales@btconnect.com

I’ve already glued a magnet into my plug but thanks anyway

email (option): Micah.leinonen@gmail.com

I may have found the problem. My gearbox mounting plates have a nasty bow in them. And although my spacers are in the correct orientation, it appears as if 2 of them have been ground down. I’m going to try and straighten them and order the correct size spacers and hopefully this will fix the problem.

email (option): Micah.leinonen@gmail.com

If you decide your mounting plates are too much trouble Micah, these work well.

https://pesltd.uk/?product=66-4157

Mark

email (option): pes.sales@btconnect.com

measure the width of the mounting lugs on your gearbox
good chance some one has fitted the early narrow box where a latter wide box should be fitted.
read the article in the technical section.

The mounting lugs are exactly 2.5” which I think is right. The frame section that attaches to the plates is slightly less at 2.475”. Should I shim it or was that intentional?

email (option): Micah.leinonen@gmail.com

I’m pleased to confirm that straight gearbox plates and correct spacers fixed my primary sprocket alignment problem.

email (option): Micah.leinonen@gmail.com

In the parts list for the RAF outfits, a 17T sprocket was used. But they did tend to under gear stuff back then. I think I'd try the 18T. Ron

email (option): ronpier@talk21.com