Drum liner queries
-
- Posts: 135
- Joined: Tue Oct 22, 2019 3:42 pm
- Location: florida
Drum liner queries
Is the liner (027144) an interference fit ? I was missing a couple of the screws so took them all off to see if the liner dropped out , it doesn't ! Will probably just leave as is , there seems to be plenty of metal left in the liner
Part number for the screws is 021766 , anything special about them or can I just find a hex head bolt that fits and grind the head down
Sent from my iPhone using Tapatalk
1954 AJS 18S Cyprus export (frame decode says 1954 but many components match a 1955).
-
- Member
- Posts: 746
- Joined: Thu Mar 31, 2005 1:00 am
- Location: BERKS UK
Re: Drum liner queries
Hi, according to the manual fitting of a new liner was a factory job, as it was most definitely an interference fit. Don't know about the bolts, but if you can't get the real thing, and I would strongly advise you to if you can, then I would play safe and use hi-tensile ones and be careful when grinding them not to let them get too hot and draw the temper. Andy
-
- Posts: 135
- Joined: Tue Oct 22, 2019 3:42 pm
- Location: florida
Re: Drum liner queries
Does anyone has a photo of how the bolt heads look from the factory, I'm interested to see if the original bolts needed grinding
1954 AJS 18S Cyprus export (frame decode says 1954 but many components match a 1955).
-
- Member
- Posts: 2159
- Joined: Thu Jul 04, 2002 1:00 am
- Location: NORMANDIE FRANCE
Re: Drum liner queries
Definitely an interference fit. Lot of heat needed to get liners out, and in!
Not sure if new liners can be had, tho' maybe there are some out there. I made one from a solid billet for mine - took 2 days, largely in back-gear on a Myford lathe with a toolpost extension, to get there! Not something I'd ever want to do again. But it's lasted 10 years so far, along with spokes and rim in SS from Central Wheel if I recall.
Spokes go in to full depth of nipple, yes. Some of mine needed a bit grinding off on the inside. I found on the front wheel they pretty well self-selected their hole in the rim if pushed home in the hub. After getting a handful in, the rest was not too bad. An advantage of straight-pull ones compared to some others!
Keeping fins clean isn't something I'm good at or care too much about on mine . . . others may have views on paint options.
Truing up the liner is something you might, probably will, have to do - but you would almost certainly have to with a new liner too.
Not sure if new liners can be had, tho' maybe there are some out there. I made one from a solid billet for mine - took 2 days, largely in back-gear on a Myford lathe with a toolpost extension, to get there! Not something I'd ever want to do again. But it's lasted 10 years so far, along with spokes and rim in SS from Central Wheel if I recall.
Spokes go in to full depth of nipple, yes. Some of mine needed a bit grinding off on the inside. I found on the front wheel they pretty well self-selected their hole in the rim if pushed home in the hub. After getting a handful in, the rest was not too bad. An advantage of straight-pull ones compared to some others!
Keeping fins clean isn't something I'm good at or care too much about on mine . . . others may have views on paint options.
Truing up the liner is something you might, probably will, have to do - but you would almost certainly have to with a new liner too.
-
- Posts: 135
- Joined: Tue Oct 22, 2019 3:42 pm
- Location: florida
Re: Drum liner queries
Is there a document which explains how this should be done ? thxGroily wrote:Definitely an interference fit. Lot of heat needed to get liners out, and in!
Truing up the liner is something you might, probably will, have to do
1954 AJS 18S Cyprus export (frame decode says 1954 but many components match a 1955).
-
- Member
- Posts: 2159
- Joined: Thu Jul 04, 2002 1:00 am
- Location: NORMANDIE FRANCE
Re: Drum liner queries
When extracting my (damaged) liner I used an acetylene torch (carefully!) to get things pretty hot . . .
I made the new one to the same o.d. as the old one near as I could, which was an interference of a couple of thou or more on that diameter. It dropped in OK. Then I trued it up using a home-made tool based on a retractable & height adjustable fly-cutter bit, rigidly anchored anchored to the wheel spindle. Operated by spinning the wheel and playing with little leadscrews on the cutter assembly. Perfect? - Hmm, no. But not too bad for all that, given you can't get an assembled wheel in a small lathe!
You do not have the required permissions to view the files attached to this post.
-
- Posts: 135
- Joined: Tue Oct 22, 2019 3:42 pm
- Location: florida
Re: Drum liner queries
Which bolts did you use and did you have to skim them down ? thxGroily wrote:Not that I know of - but I know nothing!
When extracting my (damaged) liner I used an acetylene torch (carefully!) to get things pretty hot . . .
I made the new one to the same o.d. as the old one near as I could, which was an interference of a couple of thou or more on that diameter. It dropped in OK. Then I trued it up using a home-made tool based on a retractable & height adjustable fly-cutter bit, rigidly anchored anchored to the wheel spindle. Operated by spinning the wheel and playing with little leadscrews on the cutter assembly. Perfect? - Hmm, no. But not too bad for all that, given you can't get an assembled wheel in a small lathe!
1954 AJS 18S Cyprus export (frame decode says 1954 but many components match a 1955).
-
- Member
- Posts: 2159
- Joined: Thu Jul 04, 2002 1:00 am
- Location: NORMANDIE FRANCE
Re: Drum liner queries
I used the orinals as I recall, cleaned up a bit to be sure they sat flush or near as dammit in 'my' countersinks. Didn't have new BSF screws of the right quality to hand. Not, though, that the parts are going to self-detach in a zillion years, with the awesome power of a SLS brake like that. The torque arm would sheer off the slider before the drum liner would budge - I reckon!
-
- Member
- Posts: 330
- Joined: Mon Jan 01, 1990 12:00 am
- Location: DENMARK
Re: Drum liner queries
I know one he used a drum from an old BMC Mini
Poul
Poul
-
- Member
- Posts: 746
- Joined: Thu Mar 31, 2005 1:00 am
- Location: BERKS UK
Re: Drum liner queries
Further to my last, I had forgotten that holding screws were socket head countersunk; I cannot see how you could grind one from a hex head. The manual does give some guidance for refitting liner for places where sending back to factory was not an option. Remove bolts, heat bare hub to 220 to 250 deg C for 20 mins, when a sharp tap shoul get liner out. To refit, heat to 210 - 215, when cold liner should drop back in. But why do it unless liner is badly worn? Book says bore new liner to 7.025 - 7.030 - how does your liner measure? You could skim it clean and measure it, a few more thou should be ok. Andy