Navigation

You are here: Home / Messages / Singles / Upright gearbox, top fixing bolt

Upright gearbox, top fixing bolt

Up to Singles

Upright gearbox, top fixing bolt

Posted by helmut_gehlen at September 29. 2017

Hello,

I have a 1949 Mod. 18 with the upright Gearbox. I can't reach the big nut from the top fixing bolt with a 9/16 W spanner.

I take of the oil tank to turn the nut. Is there a better way to turn the nut?

Thanks

Helmut

Re: Upright gearbox, top fixing bolt

Posted by richard_payne at September 29. 2017

There is a proper spanner for the job.

Attachments

Re: Upright gearbox, top fixing bolt

Posted by jim_hill at September 30. 2017

I also have a1948 es2 and struggle with altering the primary chain tension! Where can this spanner be purchased ? Presumably the number quoted is a suppliers reference number, it would be very useful to know where such supplier can be located please.

Re: Upright gearbox, top fixing bolt

Posted by Andy Marks at September 30. 2017

I've always managed to get on my 1934 Inter with a regular combination spanner. The angle on the ring spanner end is just right to clear everything. I'm guessing the post war Nortons had wider mudguards though, so could you warm up and bed a spanner to suit the job?

My tool kits are full of specially modified tools, and it's always worth picking up a few of the more common sizes at autojumbles so they can be modified as and when.

Re: Upright gearbox, top fixing bolt

Posted by George Phillips at September 30. 2017
"Bed a spanner"? Sorry - couldn't resist it!

Re: Upright gearbox, top fixing bolt

Posted by richard_payne at September 30. 2017

The number that I had scribbled on the background is the pre-war Norton part number for the toolkit spanner. I believe that the post-war number was A2/576

I don't know of anyone making and selling them. Beaulieu or eBay are the best options or perhaps Vintage Tool Company has some ?

Some have 'Gearbox Top Nut' cast on them.

The extended nut on the gearbox top mount should be fitted on the left hand (primary chaincase) side. Some battery boxes make it easier than others to get in there (WD16Hs are particularly limited).

Re: Upright gearbox, top fixing bolt

Posted by david_gibson at October 01. 2017

I have a 35 Inter and a 37 mod 50 with dolls head gearboxes. It is indeed convenient for adjustment to have the nut behind the battery carrier but if you want to remove the gearbox, you have to get the bolt out of the top bracket. This is prevented by the dolls head and will need removal of outer and inner cover first!. Best to have the nut behind the dolls head. I bought a £1 combination spanner from Kempton jumble and ground away the open ended 'ears' until I could get a bite on the nut and a fraction of a turn. Working from in front of the oil tank, put the gear linkage into fourth gear to give more movement/clearance. Slow job but works, as I found out in a pub car park on our 'mouth to mouth' 2000 mile run!. Probably possible to work from behind and in front of the oil tank. Seem to remember no clearance to use the ring end...cut it off. I also think that there is a flat on the gearbox casting to indicate that this is the correct way round but may be wrong and the bikes are too oily to look.

Re: Upright gearbox, top fixing bolt

Posted by helmut_gehlen at October 03. 2017

Hello to all members,

who give me this usefull informations.

 

Thank You!

Helmut

Powered by Ploneboard
This is Brio Diazo Plone Theme