G80 49 model frount axel bent

Information relating to the Matchless G80 or AJS Model 18 500cc Heavyweight.
Member
Posts: 3
Joined: Sun Sep 03, 2017 8:17 am
Location: NSW AUSTRALIA

G80 49 model frount axel bent

Postby G80steve » Sat Jun 22, 2019 6:57 am

Hi all
I have removed both frount and back wheels to replace the tyres. On reassemble I have noticed the frount axel has a very slight bend in it. I have attached a very blurry picture that shows the bend,

Question is can I straitened it? If so any suggestions on how I should do this would be appreciated.
Or any other suggestion would be greatly appreciated.
You do not have the required permissions to view the files attached to this post.

Member
Posts: 1356
Joined: Mon Mar 24, 2014 5:44 pm
Location: Aberdeenshire

Re: G80 49 model frount axel bent

Postby Mick D » Sat Jun 22, 2019 8:23 am

Hi

I'd straighten it in a hydraulic press and confirm accuracy with a DTI whilst the spindle is mounted and rotated on vee blocks - if you don't have this tooling any good engineering workshop will have. Easy task, should take no more than half an hour so not expensive.

Regards Mick

Member
User avatar
Posts: 3481
Joined: Mon Jan 01, 1990 12:00 am
Location: LONDON UK

Re: G80 49 model frount axel bent

Postby clive » Sat Jun 22, 2019 5:35 pm

I would be less keen to do this as the part under the bearing is significantly reduced in diameter. Straightening it may cause stress cracks. The bend is very minor and i doubt you would notice the minor tweak that would be needed on steering.
clive
if it ain't broke don't fix

Member
Posts: 3
Joined: Sun Sep 03, 2017 8:17 am
Location: NSW AUSTRALIA

Re: G80 49 model frount axel bent

Postby G80steve » Mon Jun 24, 2019 11:27 am

Thx both Mike and Clive
I really appreciate both of your suggestions on how to deal with this problem.

From what you indicate Clive using the axel will have very little effect on the front end, so I will try this first and if it doesn’t work I can look for a second hand one even new if available.

Again thx both
Steve

Member
Posts: 1356
Joined: Mon Mar 24, 2014 5:44 pm
Location: Aberdeenshire

Re: G80 49 model frount axel bent

Postby Mick D » Mon Jun 24, 2019 1:41 pm

Hi

I'm not sure I fully understand Clive's reply - I don't think the shaft diameter is reduced under the taper rollers.

I do know that with the shaft bent the taper rollers are no longer parallel to each other, this will result in more rapid wear, inefficient bearing adjustment and possibly overheating. It can also upset the relationship of the fork sliders to the stanchions, cause wear to the bushes, and effect the clamp up of the spindle / fork caps.

Regards Mick

Member
User avatar
Posts: 3481
Joined: Mon Jan 01, 1990 12:00 am
Location: LONDON UK

Re: G80 49 model frount axel bent

Postby clive » Mon Jun 24, 2019 10:15 pm

May well be i am wrong Mick but if there is no change in diameter why can you not get the caged rollers off the shaft. And why can someone not simply remove the rollers and replace the bearings with new tapered rollers instead of paying £160 for the new one shaft and all from Vintage Bearings?
clive
if it ain't broke don't fix

Member
User avatar
Posts: 589
Joined: Tue Mar 15, 2016 8:51 pm
Location: Lincolnshire, UK

Re: G80 49 model frount axel bent

Postby Pharisee » Tue Jun 25, 2019 9:05 am

clive wrote:May well be i am wrong Mick but if there is no change in diameter why can you not get the caged rollers off the shaft. And why can someone not simply remove the rollers and replace the bearings with new tapered rollers instead of paying £160 for the new one shaft and all from Vintage Bearings?


There is no inner race on the original axle. The axle is heat treated and ground. The rollers bear directly on the axle. The replacement from Vintage Bearings has a reduced diameter and seperate, replaceable taper roller bearing are fitted.

Member
Posts: 431
Joined: Thu Mar 31, 2005 12:00 am
Location: BERKS UK

Re: G80 49 model frount axel bent

Postby Andy51 » Tue Jun 25, 2019 8:58 pm

As far as I know, the rollers and outer race are not a standard size, so if you remove the rollers and cage, you cannot get replacements. Andy

Return to G80 / Model 18

Who is online

Users browsing this forum: No registered users and 10 guests