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willysmjeeps.com :: View topic - Minimum brake drum thickness M38
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Minimum brake drum thickness M38

 
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acengraver
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Joined: Jan 14, 2009
Posts: 104
Location: Birmingham, Alabama

PostPosted: Thu Jul 09, 2020 6:45 pm    Post subject: Minimum brake drum thickness M38 Reply with quote

I'm restoring a 1952 M38. The brake drums are not in terrible shape but they would benefit from being turned. I don't know their past history. What should the thickness of the drum be? Or, what is the maximum diameter of the inside of the drum after turning and still have a usable drum?
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1952 M38A1
1952 M-100 Strick
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wesk
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Joined: Apr 04, 2005
Posts: 14979
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PostPosted: Thu Jul 09, 2020 11:29 pm    Post subject: Reply with quote

Here's where the M38 owner should not only have a set of the military manuals applicable to his M38 he should also have the CJ2A/CJ3A civvy manual SM-1002.

The info you seek is not published in the Army Manuals but it is published in the Civvy SM-1002.

The ID of a new factory drum is 9.00 inch (209 mm). The max recommended material removal on these drums is .030" (0.762mm). This would effectively increase the ID of your drums to 9.060". The SM-1002 recommends when this size material removal is done to use the factory .030 oversize brake shoes or shim the new linings with an .030" shim.

I have most of this SM-1002 manual in my photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=album71&op=modload&name=gallery&file=index&include=view_album.php


CJ3A (M38) Drum ID 9.0 Inch (209 mm)


Read note at lower right corner.
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acengraver
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Joined: Jan 14, 2009
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Location: Birmingham, Alabama

PostPosted: Fri Jul 10, 2020 5:04 am    Post subject: Reply with quote

Thanks. That's what I needed to know.
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MVPA #30367
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1952 M38A1
1952 M-100 Strick
1951 M38
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1943 GPW
1942 Chevrolet G506
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