In reviewing the oil pump installation instructions in the '48-'52 Mechanical Procedure Manual versus those in the '53-'54 MPM Supplement, there is either a glaring error or Hudson changed their specs between '52 and '53.
These manuals contain a number of errors and dis-informative passages but this one has been bugging me for a while (years, actually).
Re: Pump installation using the K-M J-2794 alignment tool.
The '48-'52 MPM, 3-8, "Installation" step 2, says to "Set flywheel timing with #1 piston on TDC". Now, unless otherwise specified, one would assume that they mean TDC of the compression stroke, right? This is re-enforced by step #6, "Set distributor in #1 firing position and install."
Fine.
Now consider the '53-'54 MPM Supplement, "Installation" 3-7 (actually begins on 3-5), Step 17, "Set flywheel timing with #1 piston on TDC and piston #6 piston in firing position".
These two sets of instructions place the distributor shaft 180 degrees opposite from one another.
I don't have any difficulty arranging plug wires to accommodate either position or I can remove/rotate the mechanical advance mechanism 180 degrees to make it look like the illustration in the MPM ('48-'52......there is no illustration in the Supplement)so this is just a question about what Hudson had in mind. Should they really be different or did the author just screw up?
I have considered the possibility that the dist. #s IAT-4009A and 4009B may hold the answer IF the A and B refer to the position of the mech. adv. mechanism but I haven't yet found enough info to pin that clue down.
F
I think, in some cases Hudson, when components didn't change from year to year, simply repeated the info. I found several references to 480-490 material in a 1951 shop manual I'm currently scanning.
Another possibility for errors is that the manuals were made up from engineering department specs - at the time. Meaning the manuals were made up as the cars proceeded down the line so if something was changed it might not have made the shop manual or parts manual for that matter.
Another good example of this is early 1930's parts books listing parts for a 1930 and 1931 Dover. Of course the Dover name was dropped after 1929 and the trucks became Essex.
Hudsonly,
Alex Burr
Memphis, TN
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