Axle bumper spacers FYI

BTW:  these wood shims are so uniformly made and fit so well that I would doubt a farmer/user would have done it.  Maybe an after-market supplier.  The history of my jeep, which shows only two or three owners suggests, as well, that none of them would  have gone to the trouble--although one of the first two DID have all four main spring ends bent upwards apparently to compensate for sagging springs. which may or may not have something to tell us about the reason for the "lifts" on the front.

Ok, here is the tech bulletin I was referring to:

Bulletin 48-19  dated 4/2/48

 

It has been found that Bumper Spacer, part No. 640207, two required per vehicle is available when installing a power take-off assembly to prevent the power take-off propeller shaft from striking the axle on full spring deflection.

 

A number of power take-off units, Part No. 640869 Rear Power Take-off Assembly: 647043, Rear Power Take-off Complete Kit: and 640726, Power Take-off Complete Kit, have been sold through our Parts Department in which was not included the necessary Bumper Spacer, Part No. 640207, and the attaching Bolts, Part No. GM100018, 5/16-24x2”.

 

These bumper spacers and attaching bolts are available through the Parts Department and should be installed on all Jeeps in which power take-off installations have been made locally. These spacers and attaching parts are now included in kits furnished by the Parts Department.

 

The necessary bumper spacer has been installed on all Jeeps equipped with Factory installed power take-offs: therefore Jeeps these Jeeps will not require any further attention.

Bill

Who knows what really went on in that factory! Here is a good shot of the rear spacers removed and a bad shot of the fronts installed.

What do you want to bet?

Remember, that's a casting number, not a part number.

    

There are a number of instances where the same casting was used to make different parts:
eg. connecting rods - the same casting was use for all rods, but there were 2 different part numbers for #1 & 3 cylinders, and #2 & 4 cylinders

Sometimes they used the casting number as the part number, sometimes they did not.

Sean




Edited by sean - 02 Nov. 2007 at 4:52pm

Ok, here is a tech bulletin on found on the front spacers.

Bulletin 48-60 10/28/48

 

When special equipment is installed, such as the Monroe Hydraulic Pump and special drives for winches and water pumps, it has been necessary to install Front Axle Bumper Spacers, Part No. 646671, in order to prevent interference with the front axle on full spring compression.

 

Beginning with Model CJ-2A, Serial No. 178936, on March 17,1948, Part No. 646671 Front Axle Bumper Spacers were installed in regular production. After this serial number, the insertion of additional spacers, when installing front power take-off driven equipment, is not necessary.

 

Now, due to a recent change in Model CJ-2A frame, further use of the Front Axle Bumper Spacers is not required. This new frame started with Model CJ-2A, Serial No. 215648, on September 20, 1948.

 

Bill

Sam,

While I don't know if the wooden spacers were factory, I will say that the hood blocks for the windshield to lay on were oak.