The Marston Sunbeam Club & Register Forum

General Category => Technical Discussion Forum => Topic started by: study on May 16, 2016, 02:00:52 PM

Title: gear change pivot
Post by: study on May 16, 2016, 02:00:52 PM
Can someone please tell me how the gear change pivot fits - mine  is a nice domed screw head on the lever side then just a plain shaft poked into the frame bracket and nothing beyond - did it have a thread and nut securing it ?
Title: Re: gear change pivot
Post by: VicYouel on May 16, 2016, 03:03:14 PM
What model and year?
Title: Re: gear change pivot
Post by: study on May 16, 2016, 03:10:42 PM
oops - Model 9 1932  :)
Title: Re: gear change pivot
Post by: singleminded on May 16, 2016, 06:48:58 PM
My '32 9A has the pivot in the tank,the bolt just screws in..John
Title: Re: gear change pivot
Post by: wessex_man on May 17, 2016, 06:04:29 PM
You should also have a spring washer behind the lever.
Title: Re: gear change pivot
Post by: study on May 18, 2016, 08:13:30 AM
I have had a better look and it does fit in a bracket on the tank. I will need to make a new pivot and sort the bracket as it must of been drilled out as some point. Does anyone know what size the thread would of been ?
Title: Re: gear change pivot
Post by: singleminded on May 18, 2016, 12:03:19 PM
http://www.tracytools.com/taps-and-dies/20-TPI-CYCLE-PITCH%20?product_id=1000
The thread is 1/2" x 20tpi. this link may be useful if you don't have one.. no need for HSS if it is only for 1 job or in ordinary steel.You will need a tap wrench as well.sorry if I'm teaching granny to suck eggs, but i don't know what experience you have ..John
Title: Re: gear change pivot
Post by: study on May 18, 2016, 12:28:55 PM
Thanks for the information - I will work out the best way to mend the tank bracket as it has been drilled out quite large.
Title: Re: gear change pivot
Post by: singleminded on May 18, 2016, 04:44:04 PM
If it is a clearance on 1/2 inch ie the bolt just slides in it may be worth a helicoil. if it is much bigger then has the stub the lever pivots on disappeared?
If the pivot is still there then get a bush made with the correct thread in it and press fit it with assembly grade loctite, it won't come out then.
if you need a bush made I can make one once i have some reasonable dimensions..John
Title: Re: gear change pivot
Post by: study on May 19, 2016, 08:10:30 AM
Thanks for the offer - I am in the process off getting a new lathe and it will be one of the first things on my list to make.  :)