Advanced Troubleshooting Guide For Air Brake Compressors; Torque Specifications - BENDIX BA-922 COMPRESSOR Manual

TORQUE SPECIFICATIONS

Assembly Torques in inch pounds (in. Ibs.)
M8x1.25-6g Cylinder Head .......... 265-292 In. Lbs. (30-33 Nm)
M5x0.75-6g Unloader Cap ................... 62-71 In. Lbs. (7-8 Nm)
M8x1.25-6g Governor Adapter .... 195-213 In. Lbs. (22-24 Nm)
M8x1.25-6g Rear End Cover ....... 195-213 In. Lbs. (22-24 Nm)
M6x1.00-6g Crankcase Cover ........... 62-71 In. Lbs. (7-8 Nm)
M20x2.50-6g Crankshaft Nut 1858-2567 In. Lbs. (210-290 Nm)
Inlet Port Fittings
1 3/16"-12 UN-2B .......................... 575-637 In. Lbs. (65-72 Nm)
M27 x 2.0 ....................................... 575-637 In. Lbs. (65-72 Nm)
Discharge Port Fittings
7/8"-14 UNF-2B ............................. 460-504 In. Lbs. (52-57 Nm)
M22 x 1.5 ....................................... 195-213 In. Lbs. (22-24 Nm)

Advanced Troubleshooting Guide for Air Brake Compressors

Symptom
Air
Air brake charging system:
Slow build (9.0) .....................................19 - 20
Doesn't build air (10.0) .................................21
Air dryer:
Doesn't purge (14.0) ....................................22
Safety valve releases air (12.0) ...................22
Compressor:
Constantly cycles (15.0) ..............................22
Leaks air (16.0) ............................................23
Safety valve releases air (11.0) ...................21
Noisy (18.0) ................................................23
Reservoir:
Safety valve releases air (13.0) ...................22
Test Procedures
(1) Oil Leakage at Head Gasket ........ 24
(2) System Leakage .......................... 24
(3) Compressor Discharge and
Air Dryer Inlet Temperature ........... 24
(4) Governor Malfunction ................... 24
(5) Governor Control Line .................. 25
(6) Compressor Unloader .................. 25
BASIC Test Information ................ 26-28
Water Port Fittings
3/4"-16 UNF-2B ............................. 319-245 In. Lbs. (36-39 Nm)
M18 x 1.5-6g ................................. 230-257 In. Lbs. (26-29 Nm)
Unloader Port Fittings
1/8"-27 NPT .............................................................. 2 - 3 TFFT
M10 x 1.5-6g ................................. 120-145 In. Lbs. (14-16 Nm)
Safety Valve Port
M16 x 1.5 ....................................... 230-257 In. Lbs. (26-29 Nm)
3/4"-16 UNF-2B ............................. 319-345 In. Lbs. (36-39 Nm)
7/8"-14 UNF-2A ............................. 319-345 In. Lbs. (36-39 Nm)
1/2"-14 NPT .............................................................. 2 - 3 TFFT
Oil Port
7/16"-20 UNF ....................................97-115 In. Lbs. (11-13 Nm)
M12 x 1.5-6g ................................. 142-159 In. Lbs. (16-18 Nm)
Note: TFFT = Turns From Finger Tight
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INDEX
Page Number Symptom
Coolant
Compressor leaks coolant (17.0) ...................... 23
Engine
Oil consumption (6.0) ....................................... 19
Oil Test Card results (1.0) .................................. 14
Oil is present:
Oil
On the outside of the compressor (2.0) ....... 15
At the air dryer purge/exhaust
or surrounding area (3.0) ......................... 15
In the supply reservoir (4.0) .................. 16 - 18
At the valves (5.0) ........................................ 18
At air dryer cartridge (7.0) ............................ 19
In the ping tank or compressor
discharge aftercooler (8.0) ....................... 19
Maintenance & Usage Guidelines
Maintenance Schedule and
Usage Guidelines (Table A) ....... 13
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Page Number
11