Standard Compressors; Closed Room Compressors; Closed Room Compressor Head Bolt Torque Sequence - BENDIX BA-921 COMPRESSOR-STD-CLOSED ROOM Service Data Sheet

a. Position the gasket (27) on either the crankcase or
the special crankcase cover and install the special
crankcase cover on the crankcase using the four
cap screws. Note: Make sure that the cover is
orientated in its original position. "Snug" all four
cap screws then torque to 62-71 inch pounds (7-8
N•m) using a crossing pattern.
b. Assuming that the fi ttings at the outlet of the special
crankcase cover and compressor oil supply port had
not been removed (fi ttings still torqued in place),
position both ends of the metal tube over the two
fi ttings and run the fi ttings down to fi nger tight then
torque to 130 - 150 inch pounds (16 – 17.5 N•m). If
a torque wrench is not available, run fi ttings down to
fi nger tight. Then tighten the fi ttings ¼ to ½ turns.
REAR END COVER (If Present)
1. Install the o-ring (24) on the rear end cover.
2. Orient the rear end cover (25) to the crankcase
using the reference marks made during disassembly.
Carefully install the rear end cover in the crankcase
making certain not to damage the crankshaft bearing
surface.
3. Install the four end cover cap screws (26) or studs.
"Snug" the screws then tighten to 195 to 213 inch
pounds (22-24 N•m) using a crossing pattern.
CYLINDER HEAD ASSEMBLY
PART ONE: HEAD INSTALLATION
Section 1: Standard Compressors
1. Note the position of the protruding crankcase alignment
pins on the deck (top) of the crankcase (21). Install the
metal inlet reed valve/gasket (17) over the alignment
pins on the crankcase.
2. Position the valve plate assembly (16) on the crankcase
so that the alignment pins in the crankcase fi t into the
corresponding holes in the valve plate assembly.
3. Position one of the embossed metal head gaskets
(14) over the alignment bushings protruding from the
cooling plate. Position the second embossed metal
head gasket over the alignment bushings on the
opposite side of the cooling plate (15). When properly
positioned, the outline of the two embossed gaskets
match the outline of the cooling plate.
4. Install the cooling plate with the head gaskets onto valve
plate assembly by lining up the alignment bushings
on the cooling plate over oversized countersunk holes
of the valve plate assembly. Again, when properly
installed, the outline of the cooling plate matches the
outline of the valve plate assembly.
5. Position and install the cylinder head (13) over the
alignment bushings protruding from the cooling plate.
When properly installed, the outline of the cylinder head
16
assembly will match the outline of the cooling plate and
valve plate assembly.
Note: To assist with correct installation, the alignment
bushings only fi t into two of the four cylinder head bolt
holes.
6. Install the four hex head cylinder head bolts (1) and
snug them, then tighten evenly to a torque of 265 to 292
inch pounds (30-33 N•m) using a crossing pattern.
CYLINDER HEAD ASSEMBLY
PART ONE: HEAD INSTALLATION
Section 2: Closed Room Compressors
1. Note the position of the protruding alignment pins on
the deck (top) of the crankcase (21). Install the metal
inlet reed valve/gasket (17) over the alignment pins on
the crankcase.
2. Position the valve plate assembly (16) on the crankcase
so that the alignment pins in the crankcase fi t into the
corresponding holes in the valve plate assembly.
3. Position and install one of the embossed metal gaskets
(14) over the alignment bushings protruding from the
cooling plate. Position and install the second embossed
metal gasket (14) over the alignment bushings on
the opposite side of the cooling plate. When properly
installed, the outline of the two embossed gaskets
match the outline of the cooing plate.
2, 8
4, 10
Sequence Torque
(N•m)
1 . . . . . . . . . . . 20
2 . . . . . . . . . . . 20
3 . . . . . . . . . . . 20
4 . . . . . . . . . . . 20
5 . . . . . . . . . . . 20
6 . . . . . . . . . . . 20
FIGURE 18 - CLOSED ROOM COMPRESSOR HEAD BOLT
TORQUE SEQUENCE.
5, 11
3, 9
6, 12
1, 7
Sequence Torque
(N•m)
7 . . . . . . . . . . 31-34
8 . . . . . . . . . . 31-34
9 . . . . . . . . . . 31-34
10 . . . . . . . . . 31-34
11 . . . . . . . . . 31-34
12 . . . . . . . . . 31-34