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Swing arm bearings and dust caps #628692
06/04/20 06:04 PM
06/04/20 06:04 PM
Joined: Oct 2012
Posts: 2,345
Furry Boots City
RedThree Offline OP
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RedThree  Offline OP
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Joined: Oct 2012
Posts: 2,345
Furry Boots City
Having been self isolating in my garage doing various tasks I noticed some movement on one swing arm bearing and the absence of the dust cap on that side. Having taken the swing arm out found that the bearing without a cap on it was every bit as trashed as you might expect. I've got the bearings and the oil seals out and new ones ordered but what I haven't found, probably mainly because I don't know exactly what they are called, are replacement caps that go on the open side of the swing arm bearing housings. Anyone got any inspiration? Obviously I have one but would like two new ones.

Re: Swing arm bearings and dust caps [Re: RedThree] #628697
06/04/20 06:24 PM
06/04/20 06:24 PM
Joined: Jun 2012
Posts: 1,311
United Kingdom, Lincolnshire
planenut Offline
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planenut  Offline
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Joined: Jun 2012
Posts: 1,311
United Kingdom, Lincolnshire
Rear swing arm bearing dust excluder caps are 48mm dia, 44mm inside and 18mm deep, there are some on ebay usually. Your LH swing arm bearing cap was probably never fitted, as with many M3Ws. I assume this because when the swing arm is adjusted almost fully to the left to align the drive belt sprockets, the bevel box sprocket will touch the dust cap as it stands proud by a few mm. I have used some aluminium speed tape as a dust excluder as it takes up less room and allows a little more adjustment. The swing arm parts info is in the Alternative Parts List, Suspension section on page 4. Try searching for "round plastic blanking end caps" on Ebay.


Last edited by planenut; 06/04/20 06:27 PM.
Re: Swing arm bearings and dust caps [Re: RedThree] #628700
06/04/20 06:38 PM
06/04/20 06:38 PM
Joined: Oct 2012
Posts: 2,345
Furry Boots City
RedThree Offline OP
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RedThree  Offline OP
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Furry Boots City
That would explain it...will have a look on eBay and at what I can do with the one by the sprocket which was indeed the missing one.
Thanks.

Re: Swing arm bearings and dust caps [Re: RedThree] #628701
06/04/20 06:39 PM
06/04/20 06:39 PM
Joined: Feb 2018
Posts: 331
SW Iowa, U.S.A.
Bitsobrits Online content
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Bitsobrits  Online Content
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Joined: Feb 2018
Posts: 331
SW Iowa, U.S.A.
Calum,

When I had my swingarm out I noticed the bearing dust caps filled to my car were a basic plastic hole plug, roughly 2" diameter (guess only, not a proper measurement).
One of mine was flanged and fitted "outside" of the tube portion where the bearing rides, and the other one (drive side) had the flange ground off and was pushed down into the tube, likely because that side has next to no clearance for a dust cap. No sealer was noted with either cap. When I was putting it all back together I changed the "outside" cap to an "inside" type to match the other, tapped them into the recess, then applied a generous amount of silicone sealant to the outside circumference to keep dust out and the caps in place.

The moral here is that if you only see one dust cap don't assume the other isn't there. It may just be pushed deeper in the opening. And if there is no dust cap, as Calum and others have noted, the bearing will very likely be in pretty bad shape.


Steve
2012 M3W #458
Iowa, U.S.A.

Re: Swing arm bearings and dust caps [Re: RedThree] #628704
06/04/20 06:44 PM
06/04/20 06:44 PM
Joined: Mar 2014
Posts: 1,026
Leicestershire, UK
Bunny Offline
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Leicestershire, UK
Originally Posted by RedThree
That would explain it...will have a look on eBay and at what I can do with the one by the sprocket which was indeed the missing one.
Thanks.
Surely you would just machine one up from a blank billet Calum? innocent


Andy
Re: Swing arm bearings and dust caps [Re: Bunny] #628713
06/04/20 07:01 PM
06/04/20 07:01 PM
Joined: Oct 2012
Posts: 2,345
Furry Boots City
RedThree Offline OP
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RedThree  Offline OP
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Joined: Oct 2012
Posts: 2,345
Furry Boots City
Originally Posted by Bunny
Originally Posted by RedThree
That would explain it...will have a look on eBay and at what I can do with the one by the sprocket which was indeed the missing one.
Thanks.
Surely you would just machine one up from a blank billet Calum? innocent

That is Plan B... crazy2


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