COMPRESSOR DISASSEMBLY
588/A page 14/24
12. To replace the crankshaft bearings, the crankcase
must be disassembled, and the crankshaft
removed. Refer to the "Bearing Replacement"
section of this manual.
Compressor
Model
Bushing I.D.
Inches (mm)
LB161B, LB162B
LB361B, LB362C
0.8753 to 0.8756
(22.233 to 22.240)
LB601B, LB602B
1.2511 to 1.2514
(31.778 to 31.786)
Table 10 - Wrist Pin Bushing Dimensions
COMPRESSOR ASSEMBLY
Compressor assembly is generally the opposite of
compressor disassembly. Before reassembling, clean
each part thoroughly. Check all machined surfaces for
burrs or roughness, and file lightly if necessary.
Replace any O-rings or gaskets that are removed or
disturbed during service.
1. CRANKCASE ASSEMBLY
After replacing the crankshaft, bearing carrier, and
bearing cover plate, the connecting rod and
crosshead can be assembled in the crankcase. See
the "Bearing Replacement" section.
a. To attach the connecting rod to the crosshead
assembly, first coat the wrist pin, the wrist pin
bore in the crosshead assembly, and the wrist
pin bushing in the connecting rod with grease.
b. Start the wrist pin in the bore of the crosshead
assembly and tap lightly until the pin begins to
project through to the inside of the crosshead
assembly.
c. Slide the connecting rod up inside of the
crosshead assembly and align the bushing with
the wrist pin.
d. Lightly tap the wrist pin through the connecting
rod until it is centered in the crosshead
assembly. The wrist pin should be snug in the
crosshead assembly. The connecting rod
should rotate freely on the wrist pin, but should
not be loose.
e. Dip the wrist pin plugs in grease and press
them against the ends of the wrist pin.
f. Place the bearing halves into each half of the
connecting rod, aligning the bearing tangs with
the slots in the connecting rod. Coat the
bearing with grease.
g. Set the top of the connecting rod over the
crankshaft journal. Replace the connecting rod
cap with the dots on the connecting rod and
cap on the same side.
h. Start the nuts on the connecting rod bolts and
torque per Table 7 - "Bolt Torque."
i. Follow this same procedure for the opposite
connecting rod.
2. CROSSHEAD GUIDE
a. Place the crosshead guide gasket on top of the
crankcase.
b. Lubricate the inside bore of the crosshead
guide with light oil.
c. Set the crosshead guide over the piston rods
and the crossheads, and slowly lower it against
the crankcase. Make certain that the
crosshead assemblies are started straight in
the bores of the crosshead guide to prevent
binding when lowering the crosshead guide into
position.
d. Install the crosshead guide capscrews. DO
NOT tighten.
3. Fill the crankcase with oil. Refer to the "Crankcase
Lubrication" section. Squirt oil into the crankshaft,
roller bearings, crankshaft journals, and crosshead
assemblies to ensure proper lubrication at start up.
4. Attach the inspection plate and the inspection plate
gasket to the crankcase.
5. PACKING BOX ASSEMBLIES
Before installing the packing boxes into the
crosshead guide, inspect the piston rods for scoring
or roughness. Remove any burrs or sharp edges.
Lubricate the piston rods and packing box O-rings
with light oil. Do not damage the packing when
starting it over the rod. Use of a Blackmer
packing installation tool is recommended.
Single-Seal Models
a. Insert the packing box O-ring into the
crosshead guide.
b. Start the packing box assembly, short end
down, over the piston rod and into the counter-
bored hole of the crosshead guide.
c. Install the packing box retainer ring, with new
nylon locking inserts, and tighten securely.
d. Repeat the above steps for the remaining
packing box.
Double-Seal Models
a. Insert the lower packing box O-ring into the
crosshead guide.
b. Start the packing box assembly, short end
down, over the piston rod and into the
crosshead guide.
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