BENDIX BA-921 Service Data
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BENDIX BA-921 Service Data

BENDIX BA-921 Service Data

Air power compressor
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BA-921BENDIX AIR POWER COMPRESSOR
CYLINDER HEAD
VALVE PLATE ASSY.
PISTON RINGS
PISTON
CRANKCASE AND
CYLINDER BLOCK
CRANKSHAFT
FIGURE 1 - BA-921 COMPRESSOR
DESCRIPTION
The function of the air compressor is to provide and main-
tain air under pressure to operate devices in the air brake
and/or auxiliary air systems. The BA-921 compressor is a
single cylinder reciprocating compressor with a rated dis-
placement of 15.8 cubic feet per minute at 1250 RPM.
The compressor consists of a water cooled cylinder head
and valve plate assembly and an air cooled integral
crankcase and cylinder block. The cylinder head is an
aluminum casting which contains the required air and water
ports as well as an unloader piston. The valve plate
assembly consists of laminated and brazed steel plates
which incorporate various valve openings and channels for
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BALANCE
PISTON
UNLOADER
PISTON
SPRING
CONNECTING
ROD
operation
UNLOADER
COVER
AIR INLET
PORT
CYLINDER
HEAD
VALVE PLATE
ASSEMBLY
CRANKCASE
(APPLICATION SPECIFIC)
conducting air and engine coolant into and out of the cylinder
head.
The discharge valves are part of the valve plate assembly.
The cylinder head, with the valve plate comprise a complete
cylinder head assembly.
The cast iron crankcase and cylinder block assembly, houses
the piston, connecting rod, crankshaft and related bearings.
The BA-921 crankcase cover is stamped with information
identifying the compressor model, customer piece number,
Bendix piece number and serial number. See figure 2.
trouble-
shooting
GOVERNOR
WATER
CONNECTION
PORT
DISCHARGE
PORT(2)
WATER
PORT
WATER
PORT
(MAY BE
DRILLED ON
SOME
MODELS)
CRANKCASE
COVER
OIL PORT

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Summary of Contents for BENDIX BA-921

  • Page 1 The BA-921 compressor is a The discharge valves are part of the valve plate assembly. single cylinder reciprocating compressor with a rated dis- The cylinder head, with the valve plate comprise a complete placement of 15.8 cubic feet per minute at 1250 RPM.

  • Page 2: Operation

    PORT OPEN DISCHARGE PORT RESERVOIR PORT COMPRESSOR FIGURE 3 - BA-921 COMPRESSOR UNLOADER SYSTEM VALVE PLATE AIR INTAKE (LOADED) During the piston down stroke, a vacuum is created in the cylinder bore above the piston. The vacuum causes the UNLOADER...

  • Page 3: Preventative Maintenance

    BACK / RETOUR AIR INLET AIR FROM DISCHARGE PORT GOVERNOR VALVE Discharge Air Inlet UNLOADER CLOSED DISCHARGE PORT Cavity Cavity PORT Unloader Piston Coolant Bore Transfer Slots VALVE PLATE Valve Plate Assembly Side of Cylinder Head UNLOADER INLET PISTON UP VALVE Air Inlet Slots &...

  • Page 4: Service Tests

    Since replace the governor as required. the BA-921 is connected to the engine air cleaner, proper periodic maintenance of the engine air filter eliminates the 3. Note that the compressor cycles to the loaded and un- need for separate filter maintenance.

  • Page 5: Leakage Tests

    All components shown in figure 9 with a key number are ine Bendix maintenance kit available from an authorized available in kits and/or as individual service parts. Bendix parts outlets.

  • Page 6: Preparation For Disassembly

    7. If the compressor is being replaced stop here and pro- precautions pertaining to use of those tools. ceed to "Installing The Compressor" at the end of the 9. Use only genuine Bendix replacement parts, com- assembly procedure. ponents, and kits. Replacement hardware, tubing, PREPARATION FOR DISASSEMBLY hose, fittings, etc.
  • Page 7 Unloader Cover Cap Screw O-Ring Head Gasket Unloader Cover O-Ring Intentionally Left Blank Unloader Cap Gasket Unloader Piston Inlet Reed Valve/Gasket Unloader Balance Piston O-Ring O-Ring Spring Safety Valve Bottom Cover Gasket FIGURE 9- BA-921 EXPLODED VIEW OF SERVICEABLE PARTS...

  • Page 8: Cleaning Of Parts

    BACK / RETOUR 4. Remove the balance piston (4) and its spring (5) from 5. Make certain the unloader vent passage under the un- the cylinder head. loader cover (2) in the head is open and free of debris. 5. Remove the four hex head bolts and washers from the INSPECTION OF PARTS cylinder head.

  • Page 9: Crankcase Cover

    BACK / RETOUR To convert foot pounds to inch pounds of torque, multiply 9. Position the unloader cover (2) on top of the balance foot pounds by 12. piston (4) making certain the stamped logo is visible. 1 Foot Pound x 12 = 12 Inch Pounds Example: 10.

  • Page 10: Torque Specifications

    M8x1.25-6g Rear End Cover ....... 195 - 213 the disassembly procedure. M6x1.00-6g Crankcase Cover ....... 62 - 71 M20x2.50-6g Crankshaft Nut ......1858 - 2567 BA-921 SPECIFICATIONS Inlet Port Fittings Typical weight ............28 lbs. 7/8"-12 UNF ............221 - 248 Number of cylinders ............
  • Page 11 BACK / RETOUR COMPRESSOR TROUBLESHOOTING CHART REMEDY SYMPTOMS CAUSE 1. Compressor passes A. Restricted air intake. A. Check engine air cleaner and replace if excessive oil as evidenced necessary. Check compressor air inlet for kinks, by presence of oil at excessive bends and be certain inlet lines have the exhaust ports of minimum specified inside diameter.
  • Page 12 H. Check the engine oil pressure with a test gauge pressure. and compare the reading to the engine specifica- tions. Bendix does not recommend restricting the compressor oil supply line because of the possibility of plugging the restriction with oil contaminants.
  • Page 13 BACK / RETOUR COMPRESSOR TROUBLESHOOTING CHART (Continued) REMEDY SYMPTOMS CAUSE 2. (Continued.) D. Worn or burned out D. Check for proper oil pressure in the compressor. bearings. Minimum required oil pressure; 15 psi engine idling, 15 psi maximum governed engine rpm. Check for excessive oil temperature—should not exceed 240 degrees Fahrenheit.
  • Page 14 BACK / RETOUR COMPRESSOR TROUBLESHOOTING CHART (Continued) REMEDY SYMPTOMS CAUSE 4. Compressor fails to A. Faulty governor or A. Test the governor for proper operation and unload. installation. inspect air lines to and from it for kinks or restrictions. Replace or repair the governor or connecting air lines B.
  • Page 15 BACK / RETOUR COMPRESSOR TROUBLESHOOTING CHART (Continued) REMEDY SYMPTOMS CAUSE 7. Compressor leaks A. Improperly installed plugs A. Check torque of fittings and plugs and tighten as coolant. and coolant line fittings. necessary. Over torqued fittings and plugs can crack the head or block casting. B.
  • Page 16 BACK / RETOUR 16 BW2158 © Honeywell Commercial Vehicle Systems Company 4/2001. Printed in USA.

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