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swelchy
Samba Member
Joined: January 07, 2013
Posts: 134
Location: Douglasville, GA
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 Posted: Mon Dec 10, 2018 4:32 am Post subject: Minimum drum thickness/maximum inside diameter |
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Anyone have the specs handy on minimum thickness on early bay drums? Having some braking issues and trying to look from all angles the condition of all the parts I have. I don’t have a Bentley for a transporter.. I only have the beetle Bentley....Yes it’s on my list but everything else seems to be a priority when my parts orders are always stacking up from something breaking or wire out. If any of you could be kind enough to have a look for me I would appreciate it... I cleaned and adjusted the brakes yesterday and I’ve got a consistent meausement on both front drums inside diameter 255mm and trying to see if this is within spec. I searched the interwebs and couldn’t dig up the info.
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1969 Westy 1915cc 044 heads 94 bore 69 stroke scatCWcrank scat lifters C25 cam straight cam gears 1:25 ratio rockers CB weber idf 40's vintage speed sport exhaust. |
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busdaddy
Samba Member
Joined: February 12, 2004
Posts: 51149
Location: Surrey B.C. Canada, but thinking of Ukraine
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| Posted: Mon Dec 10, 2018 7:36 am Post subject: Re: Minimum drum thickness/maximum inside diameter |
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The wear limit for 68-70 (4 wheel drum buses) is 251.5 mm.
Sure you are measuring accurately?
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kreemoweet
Samba Member
Joined: March 13, 2008
Posts: 3899
Location: Seattle, WA
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| Posted: Mon Dec 10, 2018 9:34 am Post subject: Re: Minimum drum thickness/maximum inside diameter |
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The max diam. is usually cast right into each drum. If I'm not mistaken, that's required by law
in the U.S.
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KTPhil 
Samba Member
Joined: April 06, 2006
Posts: 34013
Location: Conejo Valley, CA
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| Posted: Mon Dec 10, 2018 10:53 am Post subject: Re: Minimum drum thickness/maximum inside diameter |
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| kreemoweet wrote: |
The max diam. is usually cast right into each drum. If I'm not mistaken, that's required by law
in the U.S. |
Agreed, but I think that law went into effect in '72. |
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swelchy
Samba Member
Joined: January 07, 2013
Posts: 134
Location: Douglasville, GA
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| Posted: Mon Dec 10, 2018 4:38 pm Post subject: Re: Minimum drum thickness/maximum inside diameter |
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i looked to see if specs were cast into the drum... none I could find... To the best of my knowledge i measured the best I could with a metric measuring tape... They are original drums with VW stamped into them... maybe they been turned a bazillion times or maybe I measured wrong... I'll pull them off and try again to get a good reading...
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1969 Westy 1915cc 044 heads 94 bore 69 stroke scatCWcrank scat lifters C25 cam straight cam gears 1:25 ratio rockers CB weber idf 40's vintage speed sport exhaust. |
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Volswagon
Samba Member
Joined: December 29, 2009
Posts: 299
Location: Knoxville, TN
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| Posted: Mon Dec 10, 2018 4:43 pm Post subject: Re: Minimum drum thickness/maximum inside diameter |
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I recall they should be turned/measured with the wheels bolted on.?
At 255 it's a moot point;)
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Last edited by Volswagon on Mon Dec 10, 2018 4:55 pm; edited 1 time in total |
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busdaddy
Samba Member
Joined: February 12, 2004
Posts: 51149
Location: Surrey B.C. Canada, but thinking of Ukraine
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| Posted: Mon Dec 10, 2018 4:45 pm Post subject: Re: Minimum drum thickness/maximum inside diameter |
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Trim/file/grind a strip of thin steel or heavy wire to the 251.5 mm length, you can double check that with multiple different rulers, tapes or 2 calipers end to end to confirm, then try and fit it into the drum, if it fits the drum is no good.
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Rust NEVER sleeps and stock never goes out of style.
Please don't PM technical questions, ask your problem in public so everyone can play along. If you think it's too stupid post it here
Stop dead photo links! Post your photos to The Samba Gallery!
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swelchy
Samba Member
Joined: January 07, 2013
Posts: 134
Location: Douglasville, GA
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| Posted: Mon Dec 10, 2018 5:00 pm Post subject: Re: Minimum drum thickness/maximum inside diameter |
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great tip thanks
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