8
FIGURE 12 - DISCHARGE
VALVE, VALVE STOP AND
SEAT
FIGURE 13 - INLET VALVE
AND SEAT
FIGURE 14
SEAL RING
SEAL RING
O-RING RETAINER
OLD
NEW
the cylinder head, check for leakage around the discharge
valve stops exposed on the top of the cylinder head casting.
No leakage is permitted.
Inlet Valves and Seats
Inlet valves and springs should be replaced, if the inlet valve
seats show signs of slight nicks or scratches. They can be
redressed with a fine piece of emery cloth or by lapping
with a lapping stone, grinding compound and grinding tool.
If the seats are damaged to the extent that they cannot be
reclaimed, they must be replaced. The dimension from the
top of the cylinder block to the inlet valve seat should not
exceed .113 in. nor be less than .101 in.
ASSEMBLY
General Note: All torques specified in this manual are
assembly torques and can be expected to fall off after
assembly is accomplished. Do not retorque after initial
assembly torques fall.
To convert inch pounds of torque to foot pounds of torque,
divide inch pounds by 12.
inch pounds ÷ 12 = foot pounds
To convert foot pounds of torque to inch pounds of torque,
multiply foot pounds by 12.
foot pounds x 12 = inch pounds
Installing the Crankshaft
Cautionary Note:
All flange mounted compressors must be assembled without
a gasket between the crankcase and flange adapter and
some compressors do not require gaskets on the end cover.
Install the new crankcase gaskets only where they were
removed during disassembly. In service failure of the
compressor will occur if gaskets are used in disregard of
the preceding.
If the compressor uses a ball type main bearing, press the
ball bearing onto the correct end of the crankshaft. Position
the ball bearing and the crankshaft in the crankcase, making
sure the drive end of the crankshaft is positioned in the
crankcase as marked before disassembly. Carefully press
the crankshaft and ball bearing into the crankcase using
an arbor press.
In the case of compressors with a front ball bearing, place
two small seal rings in the counter-sunk holes at the front of
the crankcase, as well as an end cover gasket Install the
front end cover in the proper position as marked before
disassembly, taking care not to damage the new oil seal.
In the case of compressors with a rear ball bearing, place
two small seal rings in the counter-bore at the rear of the
crankcase. In one case a gasket is used and in another a
large O-Ring is placed in the counterbore at the rear of the
crankcase. These are in addition to the seal rings. Install
the rear end cover in the proper position as marked before
disassembly. Since June, 1978, the two small seal rings
have been increased slightly in cross section and a retaining
ring added, as shown in Figure 14.
In the case of compressors with a sleeve bearing either
front or rear, place the two small seal rings in the counter-sunk
holes in the crankcase. Caution: An end cover gasket must
not be used. Place the O-Ring seal in the groove around the
flange adapter or the end cover, and affix the thrust washer.
Install the flange adapter or end cover in the proper position
as marked before disassembly, taking care not to damage
the sleeve bearing.
Secure the flange adapter, front or rear end cover to the
crankcase by tightening the four cap screws. See note below
for torque.
(35 pages)
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