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Re: 1939 VB 1.5 ton truck Rear Brake job... [Re: Lightholder's Dad] #1312115
Mon May 27 2019 10:05 PM
Mon May 27 2019 10:05 PM
P
Philipj  Offline OP
Shop Shark
Joined: Jan 2019
Posts: 137
FL

Hello Kent,

Thank you for your reply and advice regarding the hardware... I will paint instead of prime not to get in trouble. As for the lubricants, things can be confusing since much has changed in 80 years and what was available then is not available now... Can we start by saying that the rear end axle and bearings needs:

1- Mineral based oil

2- Hypoid Oil (EP) extreme pressure

So I found:

Mobilgear 600 XP150, SAE 90W

https://www.grainger.com/product/MOBIL-Mineral-1MUC7

https://www.mobil.com/en/industrial/lubricants/products/mobilgear-600-xp-150

which seems to have both characteristics... There is also a SAE140W if better suited for the rear end and bearings in a hot climate. I'm just trying to select the right oil for the truck which it is not easy...


Philippe Jeanneau
Re: 1939 VB 1.5 ton truck Rear Brake job... [Re: Philipj] #1312117
Mon May 27 2019 10:24 PM
Mon May 27 2019 10:24 PM
P
Philipj  Offline OP
Shop Shark
Joined: Jan 2019
Posts: 137
FL
Getting to the rest here, my axles are held by 8 bolts, but the hubs have 10 bolts... I will give the "Right Stuff" a try since it sound pretty good... As for the lock pins, I have a feeling they're going to be tricky... The small shop manual I have for 1938 (Cars and trucks) doesn't specifically tell you how to remove them at all...


Philippe Jeanneau
Re: 1939 VB 1.5 ton truck Rear Brake job... [Re: Philipj] #1312282
Wed May 29 2019 03:04 AM
Wed May 29 2019 03:04 AM
P
Philipj  Offline OP
Shop Shark
Joined: Jan 2019
Posts: 137
FL
I finally took the brakes apart today and the biggest problem seems to be the frozen adjusters on the wheel cylinders causing a problem with one shoe getting hot on one side... I snapped one of them while trying to turn it. It is going to be a joy to pin the new one in on the plate... The one that came undone was braced, the others are pinned with a hammer and punch...

Don't know what the proper procedure for securing them is... The shoes are actually fine...

I have a few other questions and nervous about breaking something else... Is it better to try to remove the entire backing plate to work on the broken adjuster?

While I have this apart it is probably a good idea to replace the hub seals, any tricks to getting them out? I am trying not to mess with anything else.. The bearings have plenty of grease and oil, I don't want to touch them to avoid any problems...

Lastly, if anyone can help with part numbers for:

1- The special hollow bolt that goes on the brake junction block that mount to the wheel cylinders and the copper washers..

2- The axle shaft outer Lock plate...

3- The special axle hub notched nuts

Thank you...


Philippe Jeanneau
Re: 1939 VB 1.5 ton truck Rear Brake job... [Re: Philipj] #1312295
Wed May 29 2019 10:13 AM
Wed May 29 2019 10:13 AM
P
Paul_WNC  Offline
Shop Shark
Joined: Nov 2011
Posts: 2,457
North Carolina
If your brake system is like I think it is...are the rear adjusters a 5/8 bolt that rotates a little disk that moves the wheel cylinder screw in/out? Pictures would help. If so, the adjusters can be sourced. The disk portion is swaged onto the bolt. Careful mig welding will accomplish the task, just don't get any heat on the tensioning spring behind it. It can be done while on the vehicle but it sounds as though you nearly have the backing plates off at this point.

1) the banjo bolt and copper washers are still common items found in a true auto parts store or online if you only have the big box auto parts stores. The bolt can be reused if still serviceable.
2) the terne plate "gasket" should be used as the soft tin helps to cushion torque transfer while sealing. Get a good part number and go on the hunt.
3) if the axle shaft to hub lock plates are not present or impossible to find, you can run without them. I use good new locknuts and a little bit of the soft setting locktite...and frequently check them. I had some of the lock plates you are looking for, so they do show up once in a while.

Re: 1939 VB 1.5 ton truck Rear Brake job... [Re: Philipj] #1312299
Wed May 29 2019 11:45 AM
Wed May 29 2019 11:45 AM
G
Grigg  Offline
.
Joined: May 2005
Posts: 8,957
Lexington, VA
The rear spindle nuts and tab washer, I don’t know what size you have but if 2”-16 you have options here.
https://www.stovebolt.com/ubbthread...-14-bolt-axle-swap-info.html#Post1249919


1951 GMC 250 in the Project Journals
1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
1952 Chevrolet 3800 pickup
---All pictures---
"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-
Re: 1939 VB 1.5 ton truck Rear Brake job... [Re: Paul_WNC] #1312307
Wed May 29 2019 12:50 PM
Wed May 29 2019 12:50 PM
P
Philipj  Offline OP
Shop Shark
Joined: Jan 2019
Posts: 137
FL
Hello Paul, you're right about the description of the system...I have located the adjuster (Pinion kit) GM 3705288. I am considering MIG or TIG as soon as I remove the backing plate...Unfortunately there are no real auto parts stores near me, so that is that is why finding original factory numbers is so important to locate the parts that I need... I have a few photos of the stuff as requested...

Curiously enough, the wheel cylinder caps are marked FC 4665 "Ind. Arg." (Industria Argentina/Made in Argentina) and the body is marked FD 3677 C3...It is the second component on the truck marked that way... The front grill is marked Gavila, M. R. Industria Argentina... Sorry to get off topic, but thought it was odd and interesting.

Attached Files
DSC_3757 - Copy.JPG (68 downloads)
DSC_3766 - Copy.JPG (66 downloads)
DSC_3771 - Copy.JPG (65 downloads)
DSC_3774 - Copy.JPG (65 downloads)
DSC_3784 - Copy.JPG (65 downloads)

Philippe Jeanneau
Re: 1939 VB 1.5 ton truck Rear Brake job... [Re: Philipj] #1312622
Fri May 31 2019 11:52 AM
Fri May 31 2019 11:52 AM
P
Paul_WNC  Offline
Shop Shark
Joined: Nov 2011
Posts: 2,457
North Carolina
Philippe,

Getting the factory part numbers is crucial in sourcing parts for vehicles so old, it is especially so with larger trucks as there is little aftermarket support. Securing a parts manual should be high on your wish list. I hope you have found a brake spring pliers as those springs are quite difficult to install without one...unless you have Popeye like forearms. The wheel cylinders look to be relatively new as the first time I noticed Argentinean brake parts to come on the market was only about 5-6 years ago. Hopefully chemists in Argentina are better at reproducing rubber components than those in China. The axle to hub terne plate seal on your truck may be the same as used on military trucks of similar age. Give me some dimensions and I can compare. If so, I have very reasonably priced sources.

Paul

Re: 1939 VB 1.5 ton truck Rear Brake job... [Re: Philipj] #1312842
Sat Jun 01 2019 11:48 PM
Sat Jun 01 2019 11:48 PM
truckernix  Offline
Master Gabster
Joined: Mar 2002
Posts: 8,826
Bracebridge Ontario Canada
If you had the chance to buy some of the main brake spring then that would be good for your stash. They sometimes are brittle and break when working with them. I think the biggest hurdle for you is the condition of the drums. Hopefully you will be lucky.

I once bought an NOS gasket set for my transmission. I dumped them out from the envelope on my bench and they shattered!


1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed


My Chevy Master 4 Door is on the Road!
Re: 1939 VB 1.5 ton truck Rear Brake job... [Re: Philipj] #1313636
Sat Jun 08 2019 03:40 PM
Sat Jun 08 2019 03:40 PM
P
Philipj  Offline OP
Shop Shark
Joined: Jan 2019
Posts: 137
FL
Hello Paul,

Trying to compile most factory part numbers that may be needed for the job... The measurements for the outer lock plate are also provided below, as well as an updated list and a better photo of the parts breakdown. If anyone with a parts book can fill in the missing blanks it would be great...Thank you.

1- Rear Wheel cylinders: GM 5300885 Casting #5300892. Raybestos WC 3677 or NAPA UP 3677

2- Rear Hub Seals: GM 3681195

3- Return Spring: GM 475511

4- Lower pin (4X) : GM (GROUP 5034)

5- Lower lock (4X) : GM (GROUP 5057)

6- Narrow pin (2X) : GM (GROUP 5029)

7- Spring (2X) : GM (GROUP 5028)

8- Small lock (2X) : GM (GROUP 5030)

9- Axle Shaft to hub (steel) outer lock plate: GM 595647

10- Axle Shaft to Hub gasket: GM 3653928 (Aluminum)

11- Rear differential cover gasket: GM 370448

12- Rear Wheel cylinder pinion kit: GM 3705288

13- Rear Wheel Hub nut lock plate: GM 473629

14- Rear spindle special nut- GM 473636

15- Brake banjo bolt: GM 476099

16- Brake line copper gasket: GM 231343

17- Special tool, spindle nut socket (6 outer slots) ABN 7436


Attached Files
Last edited by Philipj; Thu Jun 13 2019 12:36 AM.

Philippe Jeanneau
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