22 FD151 Gas Compressor
Bearing - Carrier Replacement
Figure 5.7A
To check the crankshaft end play, first remove the oil
pump (see Section 5.7). Press the end of shaft
towards the crankcase; if a clicking noise or motion
is detected, the crankshaft has too much end play. To
reduce end play, remove the bearing cover and
remove a thin shim. Recheck the end play after
replacing the bearing cover. When there is no
detectable end play, the shaft must still be able to
rotate freely. If the shaft sticks, binds or becomes
abnormally warm, the crankshaft bearings are too
tight. If the shaft is too tight, add more shims but
make sure not to over-shim. (Appendix E lists the
proper crankshaft end play.)
When the shaft can be rotated freely by hand and
no end play is present, the rest of the compressor
may be reassembled. If the crankshaft roller
bearings are too tight or too loose, premature
bearing failure will result.
Reinstall the flywheel on the crankshaft and check
the runout as shown in Appendix E.
5.7 OIL PUMP INSPECTION
Damage to the oil pump may result if the compressor
operates for a prolonged period with dirty or
contaminated crankcase oil. To check the oil pump,
unbolt the pump cover and remove the oil pump,
spring guide, spring and oil-pump shaft, as shown in
Figure 5.7A. Inspect the gears in the oil pump for
corrosion or pitting and replace if necessary. Check
the oil-pump-shaft bushing in the bearing carrier. If
the bushing is corroded, pitted or worn, the oil-pump-
shaft bushing should be replaced.
Before reassembling the oil-pump mechanism,
replace the O-rings in the oil-pump cover and in the
oil pump adapter shaft (see Figure 5.7A). Rotate the
drive pin in the crankshaft to a vertical position for
easiest reassembly. Insert the shaft adapter so it
engages the drive pin. Next, insert the spring guide
and oil-pump assembly. The tang on the oil pump
must align with the slot in the shaft adapter. Install
the pump cover so the pin on the case is in the
opening on the oil-pump assembly as shown in
Figure 5.7A. When you are sure the pin is properly
aligned, install the cover bolts
finger tight
. Rotate
the crankshaft by hand to ensure smooth operation.
Then rotate it in opposite directions, listening for a
click which indicates proper alignment of the oil
pump's pins and slots. Finally, tighten the bolts in an
alternating sequence. See Section 3.3 for directions
on oil pressure adjustment.
Locate oil-filter adapter as shown
Oil Suction
Pin
Align slot (pump-shaft
adapter) with pin (crankshaft)
Align tang (oil-pump
assembly) with slot
(pump-shaft adapter)
Oil filter
O-ring
Pin (pump cover) must
fall in grooved area
(oil-pump assembly)
Oil Filter Adapter
Oil-pump Assembly
Spring Guide
Spring
Pump-shaft Adapter
O-ring
Pump-shaft
Bushing
Guage
For compressors without oil-filter assemblies use optional
pump cover. Assembly instructions are the same as above.
Tang
