57 Yellow Inspection Paint

[Michael H.]

Re: 57 Yellow Inspection Paint

BTW, I think the brake drums also got painted black, at least on the back edges, but the paint is often missing after so many years. Anyone else have thoughts on this one?

That guy that posted about three hours ago seems to think the face side of the drums were coated with black too.

[Troy P.]

Re: 57 Yellow Inspection Paint

I don't doubt it but was wanting to clarify on the back rim as that's all you can see in judging.

[Michael H.]

Re: 57 Yellow Inspection Paint

I don't doubt it but was wanting to clarify on the back rim as that's all you can see in judging.

Troy,

I suppose you could just paint the inner ridge, or maybe the ridge and the first inch of the drum for judging. That's probably all that would be visible with the wheels installed.

When the complete differential was painted, the backing plates and drums were already installed so the entire surface of each would have been coated too. (not the inside though)

I wonder if there's a good picture of the complete differential assembly in the Noland Adams book that shows the assembly prior to being set on the chassis?

[Tom P.]

Re: 57 Yellow Inspection Paint

Jerry,

That page is a copy directly from the 1956-7 Judging Manual.

Gary
....

OK, I finally found it. It's further back, pg95. But there are still more paint markings to be identified.
And for those that have been identified in the chart, what do the different colors indicate? There must be a purpose tied to each color, Only the blue on the pinion nut identifies that the nut was torqued----------------------------which sorta kinda is not exactly correct. The pinion nut is not tightened to a torque spec, it is tightened until an in/lb spec is achieved when turning the pinion after the crush sleeve has been compressed to achieve the in/lb turning resistance spec when turning the pinion. Anyway, that's the only place that indicates a purpose for a particular color.

[Gary C.]

Re: 57 Yellow Inspection Paint

Troy,

If you want to see what was painted, go to Rob's C1 registry and download the MIRA report. Photos are black & white, but it clearly shows what was painted black.
http://www.c1registry.com/downloads/...e_Analysis.pdf

Gary
....

[Troy P.]

Re: 57 Yellow Inspection Paint

I'm leery of looking at later C1s when searching for 53-55 info. But that report is very interesting.

[Michael H.]

Re: 57 Yellow Inspection Paint

Troy,

If you want to see what was painted, go to Rob's C1 registry and download the MIRA report. Photos are black & white, but it clearly shows what was painted black.
http://www.c1registry.com/downloads/...e_Analysis.pdf

Gary
....

Thanks Gary. Very interesting pictures. Although the black/white pictures make it difficult to see what was painted and what wasn't, there is one picture that tells just exactly how the entire differential, including brakes etc, was painted as a complete assembly. Lets see if anyone can find it.

[Gary C.]

Re: 57 Yellow Inspection Paint

Mike,

Very cheap err low cost black asphalt type paint designed to last only until the car was sold.

Gary
....

[Michael H.]

Re: 57 Yellow Inspection Paint

Mike,

Very cheap err low cost black asphalt type paint designed to last only until the car was sold.

Gary
....

Gary,

Look at the picture of the rear brake shoes with the brake drum removed. The drum is laying next to it. Look at the axle flange between the wheel studs. There you will see the evidence that proves that the entire differential was painted as a complete assembly.

[Tom P.]

Re: 57 Yellow Inspection Paint

I presume everyone has noticed the brake shoes are HD style but the drums are std style.

[Bob J.]

Re: 57 Yellow Inspection Paint

Tom, I think they're just metallic brakes not the HD brakes Bob

[Gary C.]

Re: 57 Yellow Inspection Paint

Tom,

Paint is mostly parts identification marks. As it was explained to me in the late 70's at Bloomington by a former Corvette plant assembly line worker. Yellow paint such as on the banjo housing and axles shaft ends denotes Corvette.

The ID paint was a visual indication that the correct part was installed since there were three plants in St. Louis; Truck, Passenger Car and Corvette. Some of front end suspension parts use the yellow ID paint as well. RH and LH tie rod end ID paint colors are in the 56-7 JM chart previously posted in this thread. Different shades of blue were used to denote LH or RH threads. The assembler didn't care which color was on which side, only that there were different colors, which meant there was a LH and RH threads.

There are other marking such as inside the rear axle pig housing. Those were made during the assembly. Never could find a good explanation on those paint marks. Speculated they might have tolerance measurements or assembly references?

The only paint mark in 56-7 that I know for sure that is an "inspection" mark; is the narrow light blue paint stripe across the pinion nut, which was made after the pinion nut was torqued.

Gary
....

[Tom P.]

Re: 57 Yellow Inspection Paint

Tom, I think they're just metallic brakes not the HD brakes Bob

Bob,
In 59-62, there were three types of brakes: Std brakes, Metallic brakes(686), and HD brakes(684-687). I've seen HD brakes with the individual pads on the shoes, but did Metallic brakes also have individual pads? I have always understood that the metallic shoes had a solid lining. Yes-no?
And I did know that Metallic brakes used the stock style drums.

[Bob J.]

Re: 57 Yellow Inspection Paint

Tom, I'm sure you do know ! I was just messing with you.
The new metallic (non HD) shoes I had looked just like the ones in the pic...... with segments. Bob

[Tom P.]

Re: 57 Yellow Inspection Paint

No, I didn't know that. I've seen cars that had the Metallic brake option, but I've never seen the drums removed. Thus, I didn't know there were segmented pads on the Metallic shoes. Conversely, I've seen many HD brake shoes (with drums removed), so I have always understood that the shoes with segmented linings were only on HD brakes. Good to know!!!
By the way, I down loaded and printed out a copy of the report for my library.
By the way, you may or may not know that I have "home made" HD brakes on the 56 using the wider Olds shoes with full length metallic linings on the shoes. Excellent street brakes!