Now that we have these two critical
measurements, disassemble the case; leave the hot flange on the
shaft, but remove the pulley.
First check for a fit between the bearings and the shaft. If the
bearings are too tight to slip over the shaft with a moderate amount
of force, use fine sandpaper to remove shaft material (except for
the tapers).
Next, check all of the shaft spacers for a
tight slip fit over the shaft. If the spacers will not fit over the
shaft, use a file, lathe or hone to remove material from the inner
bore of the spacers -- do not remove material from the shaft at
this point.
We are now ready to trim the shaft spacers to
length and complete the shaft assembly.
Note: At this time we do not need the bearing
spacers or preload spring -- set them aside for final assembly in
the case.
- Trim flange spacer to 0.068 inch
- Trim shaft spacer 1 to 1.25 inch
- Trim shaft spacers 2a, 2b to 1.375 inch
- Trim shaft spacers 3a, 3b to 1.146 inch
- Trim pump disk spacers to 0.125 inch
Assemble all of the components as shown in
Figure 1 -- except for the bearing preload spacers and springs, and
shaft spacer 4, shaft springs and spring washer.
Measure the distance between the bearing inner
surfaces. This distance must be 2.73 inches precisely. Trim
pump disk spacers or shim out to 2.73".
Next, with the pulley bolted to the shaft end,
measure the distance between the pulley and shaft spacer 2b.
Subtract 0.28075 from this value and trim shaft spacer to that
length.
Disassemble shaft components and chamfer all
edges. Clean all components thoroughly; make sure there are no metal
shavings in the bearings.
Oil bearings with turbine or DTE 24 and set
them aside in a clean bag.
Shaft spacers 2a and 2b are the seal races and
therefore must be highly polished prior to final assembly.
Polishing may be accomplished either on a
lathe (or drill) or on a bench polisher. When mounting on a lathe or
drill, clamp to the inner bore or outer edges. The area of the
spacer that contacts the seal lip must be free from all nicks and
defects and have a bright, smooth finish for maximum seal life.
Spinning the spacer at high speed, use crocus
cloth to pre-polish the metal surface. Finish with a cloth and
polishing compound. When using a bench polisher for finishing,
rotate the spacer evenly and with even pressure. Start with a coarse
polish stick and end with the finest.
Clean all polishing compound from the spacer
and continue to shaft final assembly.
