Carrier Transicold X4 7300, Operation & Service Manual

Page: 244 / 282

62-11637 8–30
Figure 8.24 Cylinder Head & Valve Plate
1. Capscrew
2. Cylinder Head
3. Cylinder Head Gasket
4. Capscrew
5. Lockwasher
6. Discharge Valve Backer 7. Discharge Valve
8. Valve Plate
9. Valve Plate Gasket
10. Suction Valve
11. Suction Valve Spring
12. Dowel Pin
- - - - -
5. If required, free the valve plates from the cylin-
der deck by using the discharge valve cap-
screws, without washers, as jackscrews through
the outermost tapped holes in the valve plate
after the valve stops and valves have been
removed. Remove the valve plate gasket.
6. Inspect the parts of the cylinder head and/or the
valve plate:
a. Inspect cylinder head gaskets for proper align-
ment and center web blow-out.
b. Inspect the discharge valves for loose or dam-
aged valve stops, or any debris that may affect
the proper operation of the valves.
c. Inspect for broken, cracked, or chipped dis-
charge valves.
d. Inspect the side valve plate discharge check
valves to ensure the pistons move and contact
the plates.
e. Inspect for broken, cracked, or chipped suction
valves.
f. Inspect the valve plate and the cylinder head
for cracks.
g. Inspect valve plate gaskets for damage and
wear.
h. 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.
i. Inspect cylinder bores for excessive wear.
Excessive wear for cylinder bores is defined as
heavy and uneven scratches, gouges, or chip-
ping 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 pis-
ton rings. If cylinder(s) are damaged, compres-
sor replacement is required.
7. Discard valves and gaskets. Use only new
valves and gaskets when assembling cylinder
head and valve plate assemblies.
8. If required, install the discharge valves and dis-
charge valve stops with capscrews and lock
washers onto the valve plates. Torque the cap-
screws to 12 to 16 ft/ lbs (16.3 to 21.7 Nm).
9. Turn the valve plate over.
10. Install the suction valve spring on the dowel pins
with the spring ends bearing away from the cyl-
inder head. (See
Figure 8.24 )
11. Place suction valve on dowel pins.
12. Place the valve plate and new valve plate gas-
ket (with flat side toward cylinder deck) on cylin-
der deck, ensuring that the valve plate is
properly positioned on the four dowel pins.
13. 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
8.25 )
Typical Arrangement - Center Head Shown
1
2 3
4
5
6
7
8
9
10
11 12
8
6
4
5
7
10
11
12