Bendix Commercial Vehicle Systems TU-FLO 550 COMPRESSOR 6/08 - Manual (Page 14)

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Connect to the compressor discharge port, a reservoir with
a volume of 1500 cubic inches, including the volume of the
connecting line. With the compressor operating at 2100
R.P.M., the time required to raise the reservoir(s) pressure
from 85 psi to 100 psi should not exceed 7 seconds. During
this test, the compressor should be checked for gasket
leakage and noisy operation, as well as unloader operation
and leakage.
If the compressor functions as indicated reinstall on the
vehicle connecting all lines as marked in the disassembly
procedure.
TU-FLO ® 550 AIR COMPRESSOR
SPECIFICATIONS
Average weight ........................................................... 53
Number of cylinders ...................................................... 2
Bore size ............................................................. 2.78 In.
Stroke ................................................................. 1.50 In.
Displacement at 1250 RPM ............................ 13.2 CFM
Maximum recommended RPM ...................... 3000 RPM
Minimum coolant fl ow (water cooled) at
Maximum RPM .............................................. 2.5 GPM
Minimum RPM ................................................. .5 GPM
Approximate horsepower required at
1250 RPM at 120 PSIG (naturally aspirated) ............ 2.5
Turbocharge limits
See Compressor Turbocharging Parameters
Maximum inlet air temperature .............................. 250°F
Maximum discharge air temperature ..................... 400°F
Minimum pressure required to unload
(naturally aspirated) ........................................... 60 PSIG
Minimum oil pressure required at
engine idling speed ............................................ 15 PSIG
Minimum oil pressure required at
maximum governed engine speed .................... 15 PSIG
Minimum discharge-line size ............................. 1/2" I.D.
Minimum coolant-line size ................................. 3/8" I.D.
Minimum oil-supply line size ............................ 3/16" I.D.
Minimum oil-return line size ............................... 1/2" I.D.
Minimum air-inlet line size .................................. 5/8” I.D.
Minimum unloader-line size ............................. 3/16" I.D.
TORQUE SPECIFICATIONS
Bolt, Nut or Screw ........................... Assembly Torque
(in. lbs.)
Cylinder Head .................................................. 440 - 500
Unloader Cover Plate ...................................... 175 - 225
Discharge Valve Seat ............. 840 - 1080 (70-90 ft. lbs.)
Inlet Valve Stop ....................... 840 - 1080 (70-90 ft. lbs.)
End Cover ........................................................ 175 - 225
Connecting Rod ............................................... 150 - 170
Bottom Cover ................................................... 175 - 225
Air Strainer ....................................................... 125 - 150
Inlet Fitting ....................................................... 175 - 225
Discharge Fitting .............................................. 175 - 225
Governor or Governor Adapter ........................ 175 - 225
Pipe Plugs
1/16 .................................................................. 35 - 50
1/8 .................................................................. 85 - 105
1/4 ................................................................ 130 - 170
3/8 ................................................................ 160 - 200
1/2 ................................................................ 200 - 270
Pipe Bushing
1/2 ................................................................ 175 - 225
Crankshaft Nut:
Marsden or Castle ........... 1200-1440 (100-120 ft. lbs.)
P/N 298125 (Metric Thread) ......2640-3048 (220-254 ft.
lbs.)
DIMENSIONAL DATA
Port Sizes
Water inlet ............................................... 1/2 - 14 NPT
Water outlet ............................................. 1/2 - 14 NPT
Air discharge ........................................... 1/2 - 14 NPT
Governor ................................................. 1/8 - 27 NPT
Oil inlet (end cover) ................................. 1/8 - 27 NPT
Oil return: Base mount ........................... 1/2 - 14 NPT
Piston
(standard) .................................................. 2.77825 in.
(.010 oversize) .......................................... 2.78825 in.
(.020 oversize) .......................................... 2.79825 in.
(.030 oversize) .......................................... 2.80825 in.
Cylinder bore
(standard) .................................................... 2.7810 in.
(.010 oversize) ............................................ 2.7910 in.
(.020 oversize) ............................................ 2.8010 in.
(.030 oversize) ............................................. 2.8110 in.
MAINTENANCE KITS AND AVAILABLE SERVICE
PARTS
Cylinder Maintenance Kit
Piston Ring Kit (standard and oversizes)
Piston and Rod Kit (standard and oversizes)
Crankshaft Bearing Kit
Gasket & Seal Kit