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1971 M375 single system rear rebuild

Unread postby rjsdotorg on Tue Jun 05, 2018 11:22 pm

A few pics of the process.

First, remove wheels almost effortlessly in a few minutes
IMG_5724.JPG



As the drum was removed, saw broken spring and other leaks and problems
IMG_5727.JPG
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Last edited by rjsdotorg on Tue Jun 05, 2018 11:49 pm, edited 1 time in total.
rjsdotorg
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Re: 1971 M375 single system rear rebuild

Unread postby rjsdotorg on Tue Jun 05, 2018 11:25 pm

This side had a new seal, but slaves leaked
IMG_5850.JPG

IMG_5729.JPG
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Re: 1971 M375 single system rear rebuild

Unread postby rjsdotorg on Tue Jun 05, 2018 11:27 pm

Slaves honed and polished.
IMG_5730.JPG


This one isn't quite done.
IMG_5869.JPG


Used 240 hone, then 320, 400, 600 1500 paper
piston to wall clearance should be <=.006"
assemble with brake system assembly lube


1-3/8 cups then installed
IMG_5849.JPG
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Last edited by rjsdotorg on Tue Jun 05, 2018 11:55 pm, edited 2 times in total.
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Re: 1971 M375 single system rear rebuild

Unread postby rjsdotorg on Tue Jun 05, 2018 11:31 pm

axle had a wear groove from original seal and oil after 60k miles.
IMG_5880.JPG


Polished the surface and checked the location; the original seal was pressed all the way into the hub.
New National 456648 seals will be tapped just flush and so the lips will ride on clean steel.
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Re: 1971 M375 single system rear rebuild

Unread postby rjsdotorg on Tue Jun 05, 2018 11:35 pm

All the parts had to be degreased, power washed, acid rust treated, and heat paint sprayed.
Loose assembly:
IMG_5879.JPG


self adjusters are smooth and clean

Assembled with spring kit from Alretta Truck parts; spendy but the only ones in existence.
IMG_5884.JPG


The springs that hook around the casting are a bitch to snap in.
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Re: 1971 M375 single system rear rebuild

Unread postby rjsdotorg on Tue Jun 05, 2018 11:42 pm

Best order of assembly:
  1. adjuster screws and slides etc
  2. heat shields and cylinders
  3. shoes and retainer nuts and washers
  4. adjuster arms and springs
  5. return springs
  6. connecting line
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Re: 1971 M375 single system rear rebuild

Unread postby rjsdotorg on Tue Jun 05, 2018 11:45 pm

a lower casting
IMG_5731.JPG


an upper
IMG_5732.JPG


IMG_5733.JPG
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Re: 1971 M375 single system rear rebuild

Unread postby rjsdotorg on Tue Jun 05, 2018 11:53 pm

Some notes on parts and such
rears.jpg
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Re: 1971 M375 single system rear rebuild

Unread postby dirtydeno on Wed Jun 06, 2018 8:43 am

Looks good, this is on my to do list in the next month or so.
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Re: 1971 M375 single system rear rebuild

Unread postby rjsdotorg on Wed Jun 06, 2018 9:14 am

dirtydeno wrote:Looks good, this is on my to do list in the next month or so.


If you don't have a torque multiplier or 500lb impact, I cannot recommend it enough.
The springs also definitely require big proper spring tools.
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