Specifications

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CRANKSHAFT
Check the crankshaft threads, keyways, tapered ends and
all machined and ground surfaces for wear, scores, or
damage. Standard crankshaft journals are 1.1250 in.- 1.1242
in. in diameter. If the crankshaft journals are excessively
scored or worn or out of round and cannot be reground, the
crankshaft must be replaced. Connecting rod bearing inserts
are available in .010 in., .020 in. and .030 in. undersizes for
compressors with reground crankshafts. Main bearing
journals must be maintained so the ball bearings are a snug
fit or so that no more than .0065 in. clearance exists between
the precision sleeve main bearing and the main bearing
journals on the crankshaft. In crankshafts fitted with oil seal
rings, the oil seal ring groove or grooves must not be worn.
The ring groove walls must have a good finish and they must
be square. Check to be sure the oil passages are open
through the crankshaft.
CONNECTING ROD BEARINGS
Used bearing inserts must be replaced. Connecting rod caps
are not interchangeable. The locking slots of the connecting
rod and cap should be positioned adjacent to each other.
Clearance between the connecting journal and the
connecting rod bearing must not be less than .0003 in. or
more than .0021 in. after rebuilding.
REPAIRS
DISCHARGE VALVES, VALVE STOPS AND
SEATS
If the discharge valve seats merely show signs of slight wear,
they can be dressed by using a lapping stone, grinding
compound and grinding tool. Install the new discharge valve
springs and valves. Screw in the discharge valve seats.
Discharge valve travel should be between .030 in. to .046 in.
To test for leakage by the discharge valves, apply 100 pounds
of air pressure through the cylinder head discharge port and
apply a soap solution to the discharge valves and seats. A
slight leakage in the form of soap bubbles is permissible. If
excessive leakage is found, leave the air pressure applied
and with the use of a fiber or hardwood dowel and a hammer,
tap the discharge valves off their seats several times. This
will help the valves to seat and should reduce the leakage.
With the air pressure still applied at the discharge port of
the cylinder head, check for leakage around the discharge
valve cap nut 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
FIGURE 10 FIGURE 11
DISCHARGE VALVE,
VALVE STOP
AND SEAT
INLET VALVE
AND SEAT
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
Press new sleeve bearings in the end cover and crankcase.
Ensure that the slot in the bearings line up with the oil
passages in the end cover or crankcase. If you have a model
with no oil passage present in the crankcase, press the
sleeve bearing into the crankcase with the slot located 90
degrees from vertical.
Install the front thrust washer with the tang inserted in the
slot toward the flange. Insert the crankshaft and the rear
thrust washer with the tang toward the rear of the compressor.
Place the oil seal ring on the boss of the rear end cover and
install the end cover making sure not to pinch the seal ring.
Ensure the tang of the thrust washer is inserted in the slot
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