50
realigned during assembly. The connecting rod parts
are not interchangeable and must be reassembled with
the same mating parts. Work on only one connecting
rod at a time to avoid confusion.
12. Remove both snap rings from the guide piston.
13. Heat crosshead piston evenly with a torch until
there is clearance between the crosshead piston and
wrist pin. Wrist pin should slide easily out of piston.
Heat evenly to avoid overheating and warpage. Do
not attempt to press out the wrist-pin.
14. Repeat this procedure for the second assembly.
‘A’ - ‘E’ and ‘V’ Blocks:
If necessary, the piston rod can be removed
from the crosshead piston by heating the piston rod
just above the crosshead piston, while the piston rod
is clamped with tool P/N SA003. When the piston
rod reaches a temperature of just under 400°F, the
lower piston rod bolt can be safely removed. Wear
leather gloves or similar heat resistant protection. See
previous step 6 for further information.
15. Bronze wrist pin bushings can be pressed out of
the connecting rod and new ones pressed in and honed
before use. Roller bearings can be removed by heating
the connecting rod end until the bearings slide out.
16. If the crankshaft bearings, crankshaft or oil pump
must be replaced, refer to the next section titled
“Oil Pump Replacement”, or the following “Bearing
Replacement”.
OIL PUMP REPLACEMENT
1. Follow steps 1-12 of the “Compressor Disassembly”
section.
2. Remove oil pressure gauge and hydraulic
unloader.
‘B’ - ‘E’ and ‘V’ Blocks:
a. Remove the hex head cap screws fastening the
oil pump cover to the bearing carrier. Remove
the oil pump cover.
b. Check the rotor to cover clearance. There should
be 0.001 - 0.003 inches of clearance. Replace
rotor/shaft/gear assembly or oil pump cover if
necessary.
c. Remove the hex head cap screws fastening the
bearing carrier to the crankcase. Remove the
bearing carrier from the crankcase.
d. Remove the O-ring from the oil pump shaft
and slide the shaft/gear assembly through the
bearing carrier bushing. Install new shaft/gear
assembly in bearing carrier and replace O-ring.
Replace outer rotor in oil pump cover. Place a
few drops of oil or grease in the oil pump cover
to lubricate at start-up.
e. With the oil pump drive shaft assembly in the
bearing carrier, set the oil pump shaft so that the
slot in the shaft aligns with the drive pin in the
crankshaft when the bearing carrier is mounted
to the crankshaft. Replace the bearing carrier
gasket, and mount the carrier to the crankcase
and install bolts by hand. Rotate the oil pump
drive shaft by hand until it is aligned with the drive
pin on the crankshaft and the bearing carrier
draws
fl
ush to the crankcase. Torque bolts to
proper speci
fi
cation.
f. Set the new oil pump cover O-ring into the recess
of the carrier, and set the oil pump cover into
the recess. Be sure the cover is rotated so
the rotational direction arrow is pointing in the
same direction as the
fl
ywheel rotation. See
the “Oil Pump Direction of Rotation” section in
the Operation portion of this manual for more
information. Hand-tighten the six oil pump cover
bolts. If the oil pump cover can not be drawn
fl
ush with the bearing carrier, the rotor/gear or
housing/bearing carrier are misaligned. DO NOT
tighten with a wrench. Remove and inspect.
g. Torque all bolts to proper speci
fi
cation.
F Block:
a. Remove the hex head cap screws fastening the
oil pump to the carrier. Carefully remove the oil
pump.
b. Remove the two Allen head cap screws holding
the thrust plate to the oil pump housing. Because
of the spring force behind the plate, hold the
thrust plate against the oil pump housing, either
with a C-clamp device, or another set of hands.
The oil pressure valve and gerotor assembly
should now be accessible.
c. To increase the oil pressure, add more valve
discs P/N FD015. To decrease oil pressure,
remove valve discs. There must be at least
one valve disc. Each additional valve disc (P/N
FD015) increases oil pressure approximately 2.5
psig.
d. Check rotor to housing clearance. There
should be .001 - .003 inches of clearance.
Replace rotor/shaft/gear assembly or housing