Hudson 1948 - 1952, Service Manual

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3. Drive out straight pin (10) which holds pump drive gear
(9) to shaft.
4. Press shaft (7) out of gear (9) by supporting oil pump
body (8) on cover face in a suitable arbor press allowing
inner rotor and shaft to clear when pressing shaft out of
gear.
5. Wash all parts in dry cleaning solvent and dry with
compressed air.
INSPECTION
1. Install rotors and shaft in pump body with inner rotor
rotated so that one lobe of inner rotor is contacting the
corresponding notch in the outer rotor. Measure clear-
ance between opposite lobe of inner rotor and outer
rotor. This clearance should be .010" or less. If more
than this, replace both rotors and shaft.
NOTE: The shaft, inner rotor, and outer rotor are sold
in matched sets only.
2. Measure thickness and diameter of outer rotor. This
thickness should be .873" or more and diameter 2.746
or more. If rotor measures less than these figures, re-
place with a new shaft assembly and new rotors.
3. Inner rotor thickness should be .873". If less than this
figure, replace with new rotors and shaft assembly.
4. With rotors and shaft assembled in pump body, place a
straight-edge across pump body between screw holes
and using a feeler, measure clearance between top of
rotors and straight edge. This clearance should be .004"
or less. If clearance is greater than this, replace oil pump
body.
5. With outer rotor (4) pressed to one side of pump body,
with feeler gauge, measure clearance between the outer
rotor and body at opposite side. This clearance should
measure .008". If clearance is more than this, replace
pump body.
NOTE: Inspection operations #4 and #5 should be made
after determining that the old rotor are satisfactory or
new rotors used.
6. Body cover (2) should be smooth. It should be replaced
if scratched, grooved, or worn. Lay a straight-edge across
the inner surface of cover and try to insert a .002" feeler
between cover and straight-edge. If feeler can be inserted,
replace cover.
ASSEMBLY:
1. Install outer rotor (4) in pump body, Figure 6.
2. Slide shaft (7) and rotor (5) assembly into pump body.
3. Support oil pump body and shaft, and rotors assembly on
a suitable clean surface and press oil pump drive gear (9)
on shaft (7). End play between hub of gear and pump
body should be .004" to .008".
4. Install gear pin, peening over both ends securely.
5. Make sure pump is thoroughly clean, then Install cover
gasket (3) in recess of pump body.
6. Install cover (2). Tighten screws evenly and securely.
Installation:
NOTE: lithe engine has been rotated after the pump has
been removed, the timing will be disturbed. It will then
be necessary to proceed as follows:
1. Remove distributor mounting screw and disconnect
octane selector tube. Remove distributor.
2. Set flywheel timing with #1 piston on T.D.C.
3. Insert aligning tool J-2794 in the distributor shaft hole
with aligning pin in line with the distributor mounting
screw hole, Figure 7.
3 - 8 ENGINE TUNE-UP