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Disassembly and Reassembly
50
10. Using a calibrated depth micrometer, measure
the oil pump cover clearance (see “Operating
Clearances” on page 22). Check this clearance
in multiple locations. If the depth is below
specification, recheck the pump cavity for
debris or part damage. If the depth is above
specification, replace the pump assembly or
pump housing.
NOTE: A depth micrometer must be used to
measure the pump cover clearance. The
micrometer calibration must be checked
before use. Place the micrometer on flat
machined surface and measure the depth (a
used compressor seal hard ring can be used).
The micrometer should read exactly zero
inches or it must be adjusted.
Figure 70: Measure Oil Pump Cover Clearance
11. Immerse new pump cover O-rings in oil and
install them in the pump cover.
12. Install the pump cover. Make sure the
alignment pin in the cover fits into the outer
wear plate alignment hole.
NOTE: The pump cover and outer wear plate
must be clean and free of debris.
13. Install the oil pump cover bolts and washers.
Torque the oil pump cover/housing bolts in
two steps using a criss-cross pattern (see
“Torque Values” on page 24).
14. Immerse new O-rings in oil and install them
on the oil pressure regulator and the oil pickup
plug.
15. Install the oil pressure relief valve and the oil
pickup plug (see “Torque Values” on page 24).
16. Install any additional oil fittings that may have
been removed.
1.
Outer Wear Plate
Figure 69: Install Outer Wear Plate
CAUTION: The oil pump cover clearance
is critical. Even when new parts are
machined correctly, a small piece of debris
may not allow the pump to seat in the
housing correctly. The resulting
interference and reduced lubrication on
initial start-up can cause premature pump
failure.
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ARC016
AGA560
1.
Bypass Hole
2.
Outer Wear Plate Alignment
Hole
3.
Alignment Pin
4.
Oil Pickup Hole
Figure 71: Install Oil Pump Cover
CAUTION: After a compressor is rebuilt
and/or stored for any amount of time, a
startup procedure must be done when the
compressor is installed or the oil pump
could fail (see “Startup” on page 65).
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2
3
4
AGA554