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andk5591
Samba Member
Joined: August 29, 2005
Posts: 16818
Location: State College, PA
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 Posted: Wed Sep 06, 2017 9:32 am Post subject: Re: Brake drum rubbing (Grinding) on backing plate |
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Yeah its a little old, but just ran into this and found a solution. Late bay with new bus depot drums, backing plates, etc. I obviously have the shorter spacers and did not want to tear everything back apart nor try to find the longer spacers. Went to Tractor Supply and got a pack of 1 3/8" ID machine bushings. About $3 for a pack of 3 or 4. Id was perfect. OD needed about 5/16" shaved off. A little thicker than the longer spacer by about 0.20". Cut the bulk of the OD off with my bandsaw and then cleaned it up on the grinder. Slid the new spacer over the axle to the existing spacers....Just did one side and have teh spacer ready for the other side.
Once I found out why I had the grinding, total fix took maybe and hour.
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Abscate
Samba Member
Joined: October 05, 2014
Posts: 24422
Location: NYC/Upstate/ROW
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| Posted: Wed Sep 06, 2017 10:34 am Post subject: Re: Brake drum rubbing (Grinding) on backing plate |
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Nice. I think there was a thread on bearing preload if you want to get that right
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kreemoweet
Samba Member
Joined: March 13, 2008
Posts: 4148
Location: Seattle, WA
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| Posted: Wed Sep 06, 2017 10:53 am Post subject: Re: Brake drum rubbing (Grinding) on backing plate |
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McMaster-Carr (www.mcmaster.com) has nice 10-pks of hardened "arbor shims" 35 mm ID x 45 mm OD in various thicknesses which would work
quite well in this application I believe, requiring perhaps only a small bit of filing on the ID.
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Ben Middleton
Samba Member
Joined: April 11, 2016
Posts: 242
Location: England, UK
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| Posted: Fri May 01, 2020 2:44 am Post subject: Re: Brake drum rubbing (Grinding) on backing plate |
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Ok so I bought the shims with the part number you recommended but theyβre too small. What are the correct dimensions for a shim for this purpose?
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Ben Middleton
Samba Member
Joined: April 11, 2016
Posts: 242
Location: England, UK
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| Posted: Fri May 01, 2020 2:43 pm Post subject: Re: Brake drum rubbing (Grinding) on backing plate |
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Not sure why the ID was 25mm on those shims. I opened the ID to 35mm on a lathe. Just for the record, OD should be 45mm and ID should be 35mm.
The recommendation for that part number should probably be removed from the first post- unless a warning is added that it may have the wrong ID.
Thanks chaps |
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SGKent 
Samba Member
Joined: October 30, 2007
Posts: 42944
Location: at the beach in Northern Wokistan
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| Posted: Fri May 01, 2020 4:14 pm Post subject: Re: Brake drum rubbing (Grinding) on backing plate |
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| Ben Middleton wrote: |
Not sure why the ID was 25mm on those shims. I opened the ID to 35mm on a lathe. Just for the record, OD should be 45mm and ID should be 35mm.
The recommendation for that part number should probably be removed from the first post- unless a warning is added that it may have the wrong ID.
Thanks chaps |
Make sure those a hardened steel or they will work from the pressures, and your axle will loosen.
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Ben Middleton
Samba Member
Joined: April 11, 2016
Posts: 242
Location: England, UK
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| Posted: Sat May 02, 2020 4:41 pm Post subject: Re: Brake drum rubbing (Grinding) on backing plate |
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| Yes the metal seemed very hard, so hopefully it should be fine |
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