Installing The Components; Figure 7.15 Piston Ring - Carrier 69NT40-541-001 Operation And Service

Suction valves are positioned by dowel pins (see
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.
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.
7.8.5

Installing the Components

a. Push pistons from the inside of the crankcase through the cylinders, being careful not to break the rings.
Place rods so that the chamfered side will be against radius of crankpins. Install the crankshaft and thrust
washer through the pump end of the compressor. Ensure thrust washer is fitted on locating pin. Do not dam-
age main bearings. Bring rods in position against crank bearings.
b. Install the pump end thrust washer on the two dowel pins located on the bearing head. (See
Ensure that thrust washer does not fall off dowel pins while installing oil pump.
The set screw on the crankshaft must be removed for this type of oil pump.
c. Install the bearing head assembly with a new gasket on the compressor crankshaft. Carefully push oil pump
on by hand, ensuring that the thrust washer remains on the dowel pins. The tang on the end of the drive
engages the slot in the crankshaft, and the oil inlet port on the pump is aligned with the oil pickup tube in the
crankcase. The pump should mount flush with the crankcase and should be oriented with the oil pick-up
tube and oil inlet port aligned as shown in
d. Align the gasket and install the eight capscrews in the mounting flange. Refer to
torque values.
e. Install matching connecting rod caps Be sure rod is not bound and crankshaft will turn correctly as each set
of rod bolts is torqued.
f. Be sure key fits properly when installing rotor on shaft Screw on equalizer tube and lock screw assembly
with lock washer and bend over tabs of lock washer. Assemble suction strainer to motor and cover and bolt
cover to crankcase. Assemble valve plates and gaskets. Assemble cylinder heads and gaskets. Turn the
shaft by hand to see that it moves freely.
g. Install the oil suction screen, the oil suction screen hold down plate and the bottom plate.
Figure 7.14). Do not omit the suction valve positioning springs.

Figure 7.15 Piston Ring

CAUTION
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CAUTION
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Figure 7.9.
7–15
Figure 7.9)
Table 7–7 for applicable
T-316