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HO52 axle flange colors/temperature #1307536 Thu Apr 18 2019 06:30 AM
Joined: Jun 2000
Posts: 2,773
F
Fred T Offline OP
Shop Shark
This end has been buried for several years. Pulled and cleaned today and confirmed my suspicions about the axle having been run without lube. I have already replaced the bearings.
[img]https://imgur.com/2fUaalI[/img]

Last edited by Grigg; Tue May 07 2019 12:20 PM. Reason: Title

Fred
52 3600
69 C-10
Re: HO52 axle [Re: Fred T] #1307556 Thu Apr 18 2019 01:01 PM
Joined: Jan 2013
Posts: 1,287
S
sstock Offline
Shop Shark
No mistake of the marks left there.

Re: HO52 axle [Re: Fred T] #1307576 Thu Apr 18 2019 03:12 PM
Joined: May 2005
Posts: 9,038
G
Grigg Offline
.
Possibly...
If the bearings were smoking hot the hub would have to be very hot enough to transfer heat to the axle flange. (the wheel bolted to the hub would also be really hot) If that happened I'd suspect the entire axle flange in contact with the hub would/should see the same temp and color change That is not what's shown with the outside portion of the axle flange being cool, no color. The color pattern indicates the axle shaft was the hot part and the heat didn't quite travel out to the outside of the flange.

I'd guess the colors on the axle shown are a result of the manufacturing process, tempering, and not an indication of previous severe bearing trouble.

Grigg


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: HO52 axle [Re: Fred T] #1307615 Thu Apr 18 2019 08:29 PM
Joined: May 2015
Posts: 1,253
K
klhansen Offline
Shop Shark
That looks kind of like induction hardening done on current production axles and bearing hubs. But I don't believe that process was used back in the day. My guess would be that the bearing surface got pretty dang hot. But I would guess that the axle surface where the bearing runs would be pretty torn up if it ran like that for very long. That color looks to be hot enough to draw the temper out of the axle. If it were mine I would get a hardness check at various spots (close to the bearing surface, for sure). If it's softened, even if not already scarred up, it isn't going to last long.


Kevin
First car '29 Ford Special Coupe
#2 - '29 Ford pickup restored from the ground up.
Newest Project - 51 Chevy 3100 work truck. Photos
Re: HO52 axle [Re: Fred T] #1309932 Tue May 07 2019 12:19 PM
Joined: May 2005
Posts: 9,038
G
Grigg Offline
.
Here’s a picture of another from a lightly used axle, no signs of any abuse or overheating.

The colors on the axle flange are a result of the manufacturing process.

Attached Files

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: HO52 axle [Re: Fred T] #1309938 Tue May 07 2019 02:01 PM
Joined: Feb 2004
Posts: 18,707
H
Hotrod Lincoln Offline
Boltergeist
Isn't that color a result of the flange being welded onto the axle during the manufacturing process? I seriously doubt that GM turned down millions of 4" diameter solid billets to make their axle shafts.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: HO52 axle [Re: Fred T] #1309941 Tue May 07 2019 02:16 PM
Joined: May 2005
Posts: 9,038
G
Grigg Offline
.
They are forged, I expect they first upset the end (make it larger and or with more metal) then finish forge the flange to shape, if not done all at one wack.
The color is on top of the finished machined part, so the heat was applied after machining. I see no evidence of spin welding a flange to a shaft, and even if so it's likely the flange was finish machined after.

I still suspect the heat/color is a result of heat treating and or tempering the shaft at the very end of the whole manufacturing process.


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-

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