Figure 8−21 Checking Suction Valve; Figure 8−22 Oil Pump And Bearing Head Assembly - Carrier VECTOR 6500 Operation & Service Manual

f. Inspect the parts of the cylinder head and/or the valve
plate.
1. Inspect cylinder head gaskets for proper alignment
and center web blow-out.
2. Inspect the discharge valves for loose or damaged
valve stops, or any debris that may affect the proper
operation of the valves.
3. Inspect for broken, cracked, or chipped discharge
valves.
4. Inspect the side valve plate discharge check valves
to ensure the pistons move and contact the plates.
5. Inspect for broken, cracked, or chipped suction
valves.
6. Inspect the valve plate and the cylinder head for
cracks.
7. Inspect valve plate gaskets for damage and wear.
8. Remove any oil on top of the pistons. Inspect the top
of the piston for damage. Check for debris, burned
and carbonized oil sludge, or mechanical failure.
9. Inspect cylinder bores for excessive wear. Excessive
wear for cylinder bores is defined as heavy and un-
even scratches, gouges, or chipping of the internal
wall of the cylinder, with a depth greater than 0.025
inch, which are caused by foreign objects, other than
a normal reciprocating movement of the pistons and
piston rings. If cylinder(s) are damaged, compressor
replacement is required.
g. Discard valves and gaskets. Use only new valves and
gaskets when assembling cylinder head and valve
plate assemblies.
h. If required, install the discharge valves and discharge
valve stops with capscrews and lock washers onto
the valve plates. Torque the capscrews to 12 to 16 ft
lbs (16.3 to 21.7 Nm).
i. Turn the valve plate over.
j. Install the suction valve spring on the dowel pins with
the spring ends bearing away from the cylinder head.
(See Figure 8−20)
k. Place suction valve on dowel pins.
l. Place the valve plate and new valve plate gasket (with
flat side toward cylinder deck) on cylinder deck,
ensuring that the valve plate is properly positioned on
the four dowel pins.
m. Using a small screwdriver, operate the suction valves
to ensure that the valve tips are not being held by the
valve plate gasket. (See Figure 8−21)
Figure 8−21 Checking Suction Valve
n. Install capscrews, cylinder head and new cylinder
head gasket (with flat side toward valve plate), ensur-
ing that the gasket and cylinder head are properly
positioned on the valve plate. Torque the capscrews,
in a diagonal pattern, 42 to 55 ft-lbs (57 to 74 Nm)
o. Leak check and evacuate the compressor. Refer to
Section 8.6.3 and Section 8.6.4.
8.7.4 Oil Pump And Bearing Head
a. Pumpdown the compressor. (Refer to Section 8.6.2.)
b. Ensure the unit will not start automatically by dis-
abling any two way communication and placing the
Main Power switch in the OFF position. Disconnect
the high voltage source and lockout/tagout the re-
ceptacle. the high voltage source.
c. Loosen the eight capscrews, tap the pump to relieve
any remaining pressure and then remove the oil
pump bearing head assembly, gasket and thrust
washer. (See Figure 8−22.)
1
1. Oil Pump & Bearing Head
2. Thrust Washer
3. Oil Pickup Tube
4. Oil Inlet Port
Figure 8−22 Oil Pump and Bearing Head Assem-
8−23
2
4
3
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