BSA Owners' Club Forum

General => The Star and Garter => Topic started by: Mike Farmer on 16 October, 2021, 11:57:58

Title: Grease in gearboxes
Post by: Mike Farmer on 16 October, 2021, 11:57:58
 :) :) :) :)

A few months??? back I brought up this subject as an alternative gearbox lubrication, and then forgot all about it. The gent that put me on to it has a 500 Royal Enfield about 1955 model. He put said grease in the box when he rebuilt it 30,000 miles back and it is still going strong. So I am about to do the same with my M20, that has never been started since I took it off the bench about 3 years back. Right at this moment I cant remeber what the grease is called.

Mike 8) 8) 8) 8)
Title: Re: Grease in gearboxes
Post by: Bess on 16 October, 2021, 13:45:19
Hi Mike,
            Semi fluid? https://morrislubricants.co.uk/products/search.html?q=Semi+Fluid+Grease

Avoid EP though.

Here's your thread: https://www.bsaownersclub.co.uk/bsaoc_forum/index.php?topic=11139.msg58799#msg58799

Best wishes...
Title: Re: Grease in gearboxes
Post by: Mike Farmer on 16 October, 2021, 19:39:04
 :) :) :) :)

Hi Bess

 thanks for that

Mike 8) 8) 8)
Title: Re: Grease in gearboxes
Post by: Dean Southall on 16 October, 2021, 20:30:14
This type of grease was available when the gearbox was designed.
It might be worth giving some thought as to why BSA didn't use or recommend it.
Title: Re: Grease in gearboxes
Post by: cee-b on 17 October, 2021, 17:24:15
This type of grease was available when the gearbox was designed.
It might be worth giving some thought as to why BSA didn't use or recommend it.

Yep, a bloody good point.

The grease does specify that it is suitable for 'gearboxes designed to operate with a semi-fluid grease' therefore, it is presumably not suitable for ones that weren't designed for it.
Title: Re: Grease in gearboxes
Post by: BEEZABRYAN on 18 October, 2021, 10:05:02
Royal Enfield of that era were grease boxes, the BSA M20/21 are not
Title: Re: Grease in gearboxes
Post by: Calum on 18 October, 2021, 13:06:52
In an M20 gearbox the constant gears on the layshaft are fed oil from a drilling in the shaft itself, and hence the gears are lubricated from the inside. I wouldn't trust grease (semi-fluid or otherwise) to make this journey (I am pretty sure it is the layshaft rather than the mainshaft)
Title: Re: Grease in gearboxes
Post by: Mike Farmer on 18 October, 2021, 14:56:31
 :) :) :) :)

All very interesting and positive. Thank you.

Mike 8) 8) 8) 8)