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The service manual says to dress it down with a surface plate but there is nothing specific in the drawing. That would be covered in the endplay which as I mentioned, contradicts the service manual. I should measure the endplay, and gear & bore lengths on my pumps and see what they actually are.

One curiosity is that the assembly in the drawing I have does not have the vacuum pump attached. Instead, it has just a plate held on with cap screws.

The one drawing that I asked the Studebaker museum for but that I don't have is the one for body with the late design relief valve, 6492431. I have only the earlier body 440679.

When I have a sec I'll cross reference the assembly BOM on my drawing vs. the parts book. Because I have the important component part drawings, I did not ask them if they had 440679, the assembly drawing as given in the parts book. But while searching they stumbled upon the drawing I did order which is a much newer number and was drawn in mid 1956.

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You'll have to tell me as I don't have an earlier pump or drawing to compare. When I have a sec I'll grab the dwg again and post the dimension.

The two gears in this pump are the same in all "gear" respects including length.

Very interesting that the V8 gears were a mod of the earlier gears. I can surely understand that as they already had the tooling for forming the teeth and the earlier pumps were trouble free. Are the overall length of the gears the same? Also, very handy to have the specs for the shaft and housing bore. On the earlier pumps, the input shaft had a much longer bearing area. I'm pretty sure that an extra overhang loading from driving the vacuum pump was a chief factor in accelerated shaft wear. What I've never figured is how some cars escaped this til high mileage and some tanked at 20K.

Well it popped right off just like you all said it would with no damage to the Stainless Steel. I was able to rubber cement the new one right where the old one was after cleaning up the spot.

Thanks again to everyone with the sage advice!

400

Kevin sold his Packard.

Not sure if he still pops in to the site.

Ask the webmaster. Kevin. He used the painless harness.

for including your '53 Mafair Hardtop in PackardInfo's Packard Vehicle Registry.

NOTE I have deleted the duplicate entry to maintain the integrity of the Registry.

hph

See the 6 part Weber State presentation on universal joints.


https://www.bing.com/videos/riverview/relatedvideo?q=weber+state+university+universal+joint+repair&mid=867BFD15D883D1662255867BFD15D883D1662255&FORM=VIRE


Edit: Sorry that link didn't work . . . seems it goes to a Weber Grill site. A search for the text "weber state university universal joint repair" works.

dp

hph

Does service data indicate the end cover wear tolerance, or a lapping procedure to restore the cover finish?

dp

Having picked up some copies of the factory drawings, I'm able to give some data:

Shaft dia was .4930 to .4935
Bore dia was .4950 to .4960
Note that this applies only to the driving shaft. The driven gear was on a dowel pin, 440601, which was a press fit into another .495–.496 hole.

You will note that this is a 1.5 to 3 thou drive shaft tolerance from the factory; yet no allowance past 3 was given in the service checks.

The two gears were identical except for the obvious differences and bore dia.

The gears when mounted in the pump have an end clearance per the factory drawings of 2 to 6 thou, yet strangely the service manual gives no more than 3 thou as acceptable. I have a 1953 and 1956 oil pump body drawing and this was not changed between them. My gear drawing is from 1953. Though both the "1953" drawings were revised through 1955 with no change in this regard. In addition I have another oil pump assembly drawing from 1956 that specifically gives 2 to 6. I can only assume they may have been selectively assembled to keep the gap down, but that would still result in a typical gap of 4.

The gear bore is 1.500–1.501 and the gear OD is 1.4945–1.6945. Again, the service manual gives no allowance for wear, specifying no more than 5 thou.

Hope someone finds this interesting and that the Studebaker museum enjoys my "donation". Let me know if you have any questions that I could look up for you. I don't have EVERY drawing just the most important drawings.

Spray the inside of the hose with brakleen, it will slide on.