BENDIX BA-921

10
RPM., the time required to raise the reservoir(s) pressure
from 85 psi to 100 psi should not exceed 5 seconds. Dur-
ing this test, the compressor should be checked for gasket
leakage and noisy operation, as well as unloader opera-
tion and leakage. If the compressor functions as indicated
reinstall on the vehicle connecting all lines as marked in
the disassembly procedure.
BA-921 SPECIFICATIONS
Typical weight ....................................................... 28 lbs.
Number of cylinders ...................................................... 1
Bore Diameter ....................................... 92mm (3.622 in.)
Stroke ...................................................54 mm (2.125 in.)
Calculated displacement at 1250 RPM............. 15.8 CFM
Flow Capacity @ 1800 RPM & 120 PSI ............ 11.8 CFM
Flow Capacity @ 3000 RPM & 120 PSI ............ 18.0 CFM
Maximum recommended RPM ........................ 3000 RPM
Minimum coolant flow maximum RPM ...... 1.3 Gals./Min.
Approximate horsepower required:
Loaded 1800 RPM at 120 PSIG ........................... 4.5 HP
Unloaded 1800 RPM ............................................ 1.3 HP
Maximum inlet air temperature .............................. 250 F°
Maximum discharge air temperature ..................... 400 F°
Minimum oil pressure required at
engine idling speed ............................................... 15 PSI
Minimum oil pressure required at
maximum governed engine speed ......................... 15 PSI
Minimum oil-supply line size ............................. 3/16" I.D.
Minimum unloader-line size ............................... 3/16" I.D.
Minimum Governor Cutout Pressure .......................90 PSI
TORQUE SPECIFICATIONS
Assembly Torques in inch pounds (in. Ibs.)
M8x1.25-6g Cylinder Head .................................265 - 292
M5x0.75-6g Unloader Cap ..................................... 62 - 71
M8x1.25-6g Governor Adapter ............................133 - 142
M8x1.25-6g Rear End Cover ...............................195 - 213
M6x1.00-6g Crankcase Cover............................... 62 - 71
M20x2.50-6g Crankshaft Nut ......................... 1858 - 2567
Inlet Port Fittings
7/8"-12 UNF .......................................................221 - 248
3/4"-14 NPT .................................................... 2 - 3 TFFT
1
Discharge Port Fittings
7/8"-12 UNF .......................................................221 - 248
3/4"-14 NPT .................................................... 2 - 3 TFFT
1
Water Port Fittings
3/4"-16 UNF .......................................................221 - 248
3/8"-18 NPT .................................................... 2 - 3 TFFT
1
Unloader Port Fittings
1/8"-27 NPT .................................................... 2 - 3 TFFT
1
Safety Valve Port
3/4"-16 UNF .......................................................221 - 248
1/2"-14 NPT .................................................... 2 - 3 TFFT
1
Oil Port 7/16"-16 UNF ........................................177 - 204
1
Note: TFFT = Turns From Finger Tight
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