Carrier 69NT40-489-100 Series, Operation And Service Manual

Page: 88 / 178

64 T-305
1
2
3
1. Equalizer Tube and
Lock Screw Assembly
2. Lockwasher
3. Counterweight --
Motor End
Figure 33. Equalizing Tube and Lock Screw
Assembly
1
2
3
4
5
6
7
8
9
10
1. Capscrew
2. Cap
3. Crankshaft
4. Thrust Washer
5. Rotor Drive Key
6. Connecting Rod
7. Compression Ring
8. Piston
9. Pin
10. Retainer
Figure 34. Crankshaft Assembly
6.8.3 Compressor Reassembly
Clean all compressor parts, use a suitable solvent with
proper precautions. Coat all moving parts with the
proper compressor oil before assembly. Refer to
Table 18, page 83 for applicable compressor torque
values.
6.8.4 Preparation
a. Suction and Discharge Valves
If the valve seats look damaged or worn, replace valve
plate assembly. Always use new valves because it is
difficult to reinstall used valves so that they will seat as
before removal. Any valve wear will cause leakage.
1
2
3
1. Suction Valve
2. Suction Valve
Positioning Spring
3. Valve Plate Dowel
Pin
Figure 35. Suction Valve & Positioning Springs
Suction valves are positioned by dowel pins (see Figure
Figure 35). Do not omit the suction valve positioning
springs. Place the springs so that the ends bear against
the cylinder deck (middle bowed away from cylinder
deck). Use new gaskets when reinstalling valve plates
and cylinder heads.
b. Compression Rings
The compression ring is chamfered on the inside
circumference. This ring is installed with the chamfer
toward the top. Stagger the ring end gaps so they are
not aligned.
Figure 36. Piston Ring
The gap between the ends of the piston rings can be
checked with a feeler gauge by inserting the ring into the
piston bore approximately one inch below the top of the
bore. Square the ring in the bore by pushing it slightly
with a piston. The maximum and minimum allowable
ring gaps are 0.33 and 0.127 mm (0.013 and 0.005 inch)
respectively.