Weird looking head bolt. Anyone know what is going on?

Don't know what the heck that is for but the other head bolt in the picture is also incorrect!!!

Can I tell RAY! Please!

Noting that the grade 8 bolt on the left is not original, could it be a tool used in the process of aligning/installing a 1/2-13 helicoil?

-R

I KNOW , It's a Boyce Motor Meter headbolt to hold the temperature sender unit, to tell the steering column mounted temperature guage how hot the motor is.
Jim

Congratulations to our friends 'down under' for the correct identification of the special head bolt.



Several years ago I purchased this NOS Boyce Motor Meter from a prior Chevrolet employee. Although the box is a little ragged from wear, it was totally complete with the device, the grommet for the firewall, the clip for the lip of the dash and most importantly, the installation instructions.



Here is the complete device. The bulb at the end of the braded wire is what mounts in the head bolt shown earlier. A few drops of oil are placed in the receptacle before the bulb is inserted and tightened. The electrical wire is connected to the dash lights.



This is the face of the meter as viewed from the driver's seat. In the center is a window that displays a green signal. When the heat gets too high the window turns to red. A bulb, connected to the dash lights for night operation, illuminates the face.



These are the instructions dated 4-12-28 and the vehicle illustrated is unmistakablely the 1928 Chevrolet. The third head bolt on the left is replaced with the special head bolt, allowing the connection to the engine.

I don't get to tell NOW!

32confederate

You don't get to tell cause you have been all over my shop and know ALL my secrets. Just kidding, should have given Bruce credit also. (Otherwise he may not help with my computer problems).

Looks like we need some more action on this thread before it comes unraveled. So here we go with some more Show and Tell.

DuKane is a name that should be familiar with Chevrolet enthusiasts. They are responsible for producing the training aids used by Chevrolet for training purposes. Although this item is not a training aid, it is another item made by the DuKane Company.

This is the DuKane Model 15A191 Musical Horn. This horn plays “See the USA in your Chevrolet”. The main control unit is on the right. The activation button in the center and the Model 5C25 horn on the left.



This DuKane unit, from my collection, came with complete mounting hardware, mounting instructions for mounting in 1965 Chevrolet, schematic, a copy of the blueprint, and operating instructions. The schematic and blueprint indicates that the unit was dreamed up on 1-4-64. In a letter to me from DuKane they stated that the unit was produced as a result of an order from GM. Further, the unit was only available to the dealer and no additional units were produced after the initial contract. (Units left over at the end of the contract were GIVEN to the employees). The last blueprint in my possession shows 4 modifications during the production.




This is the soundboard. The horn is a combination of electrical and mechanical. The arm noted in the center rotates clockwise and makes contact with the soundboard in sequence. To play “See the USA in your Chevrolet” requires one revolution of the arm and then it stops automatically. In the letter from DuKane they stated that 4 soundboards were designed. If you look on the lower right of the board you will see “Chevrolet”. In addition to this board, Greyhound, Anchors Away, and Merry Oldsmobile were produced.




This is the circuit board for the horn. The first printed circuit board used by Chevrolet was in the 1956 Pushbutton Radio. The following year the first transistor appeared in the 1957 PB radio. With this experience and technology available the combination of the two in 1964 allowed big things to happen in a small box. The 4 adjusting screws at the bottom of the board produced the 4 musical notes necessary to sound “See the USA in your Chevrolet”.



In the center right is the DC motor that moved the control arm across the sounding board. On the circuit board were controls to adjust the volume and speed of the control arm. The unit drew its power from the vehicle 12-Volt battery.

Very nice! And interpreting the note labels on the copper strips of the sound board along with their relative durations, one can hum the tune in his head. The initial A followed by G# are partially obscured by the arm.

Given the availability of copper-clad circuit boards today and using an etching solution, it wouldn't be too hard to replace the sound board with something more interesting. (La Cucaracha?)

-R

Tool kit 1949-54 All. Came in the paper container.



The bags came assorted and three types pictured.

I have one in the paper container and one in a box.They must have changed packaging between 1949 and 1954....I remember the '55-'61 and '61-64 kits coming packed in the paper containers.We used to open them up and use the tools in the parts dept.I also have just the cloth pouch from a kit and its olive drab cloth-not sure of year but may have been '55 and up Have a '62-'64 kit in a plastic pouch-Blue back and clear front.

I also have a new old stock 1949-54 tool kit in the box, but when I opened it up to check out the tools I found that the spark plug socket was for the earlier 10mm spark plugs instead of for the 14mm spark plugs. At any rate, I found a new old stock 14mm spark plug socket and put it in the kit to make the kit correct.

I would send a letter to GM and complain

I did! Where do you think I got the new old stock 14mm spark plug socket from?

antique mechanic,

thanks for sharing the story & photos of the dukane musical horn...

my '30 roadster delivery has this switch mounted under the dashboard...when chevy borrowed this vehicle from the previous owner to put on a national tour in 1970, they installed one of these units (they must have had a 12v battery set up somewhere to drive the musical horn)...

unfortunately, all that's left is the switch & some wiring running back under the bed...

it's fun to see what that unit actually looked like & how it worked...

epi

1949-1954 Tool kit. Just an FYI. I have seen alot of original NOS tool kits from '49-'54 with a mixing of both Vlchek and McKaig-Hatch open end wrenches in the same kit. Three open end wrenches were put in each kit: 3/8" x 7/16", 1/2" x 9/16" and 5/8" x 3/4". I spoke with one VCCA owner, of a 1951 Chevy with an original NOS tool kit in it. Note: His 1951 tool kit was in the rectangular cardboard box. He wanted to get rid of one of the open end wrenches, because it was McKaig-Hatch. He wanted to acquire a Vlchek wrench so that it would match the other 2 Vlchek open end wrenches. I informed him that Chevrolet was in the business of selling cars, and it was not high on their priority list to make sure that the 3 open end wrenches were all manufactured by the same supplier. After that discussion, he was once again a happy and satisfied 1951 Chevrolet owner.

We haven’t had a SHOW AND TELL for sometime so here is one that will ignite you (pun intended).

Notice that the Ajax, Blazer, Rex and Texas have a Chevrolet Bowtie on them. The Hastings plug (shown in both pictures) says “for chev replacement”

Bet you don’t see a lot of these plugs around.


[img]http://home.comcast.net/~chev33radio/SparkPlug1[/img]

[img]http://home.comcast.net/~chev33radio/SparkPlug2[/img]

Do you suspect that the bow-ties were any way associated with Chevrolet or just used by a spark plug manufacturer as their logo? Since these are two piece plugs with three brand names having similar porcelin and the other only differing with a couple of rings it seems likely that the same manufactuer made at least three and maybe the fourth plug with the bow-tie. Like a lot of aftermarked products attempts were made for logos to appear to be like real things.

Hi Guys is that rex plug (last of the pictures)a tapered thread ?I didn't think that chevrolet used tapered thread plugs only T **** 's .

i have a dukane model 15a191 musical horn fully intact,..,..,im having a hard time finding out what it might be worth .,..,im interested in selling it asap.,.,.,can anybody help me with any info??
pleasssse??

By complete I assume you have the box, the horn, and the switch?