TRUCK SERVICE MANUAL
FUEL SYSTEM
VT-50 Specifications
Part or Location
Min. Inch [mm]
Max. Inch [mm]
Wear Limit Inch [mm]
Bearing Housing Sealing Ring Bore
1.275
1.276
1.274 to 1.278
[32.391
[32.41)
[32.36 to 32.461
Bearing Housing Heat Shield Slots
0.460
0.500
1.500
[11.681
[12.701
[38.10]
Bearing Housing Bore/OIl Seal Bore
1.275
1.276
1.274 to 1.278
(Turbine End)
[32.39]
[32.41]
[32.36 to 32.461
Bearing Housing O.D. (Compressor End)
5.3975
5.4005
5.3965 to 5.4025
[137.10]
[137.17]
[137.071 to 137.224]
Bearing Housing O.D. (Turbine End)
5.050
5.052
5.049 to 5.055
[128.27]
[128.32]
[128.25 to 128.40]
Bearing Housing Length (Overall)
4.005
4.010
3.990 to 4.012
[101.731
[101.85]
[101.35 to 101.90]
Bearing Housing Length (Compressor stop
2.989
2.992
2.986 to 2.994
to turbine stop)
[75.921
[76.00]
[75.84 to 76.05)
Bearing Length
3.078
3.080
3.0765 to 3.081
[78.18]
[78.231
[78.14 to 78.26]
Bearing Flange Thickness
0 138
0.142
0.136 to 0.143
[3.51]
[3.61]
[3 45 to 3.631
Bearing Flange Width
1 920
1.950
1.850 to 1.960
[48.77]
[49.53]
[46.99 to 49.78]
Bearing I.D
0.75
0.7525
0.7515 to 0.7530
[19.10]
[19.11]
[19.09 to 19.13]
Bearing O.D
1 272
1.273
1.271 to 1 274
[32.30]
[32.33]
[32 28 to 32.36]
Rotor Shaft Journal O.D
0.750
0.7505
0.7495 to 0.7505
[19.05]
[19.06]
[19.04 to 19.06]
Compressor Housing I.D
5 402
5.404
5.400 to 5.406
[137 21]
[137.26]
[137.16 to 137.311
Turbine Casing I.D
5.055
5.057
5.053 to 5.058
[128.40]
[128.45]
[128.35 to 128.47]
Turbine Casing Depth
1.195
1.200
1.1935 to 1 202
[30.351
[30.481
[30.31 to 30.53]
Total End Clearance
0.006
0.017
0.005 to 0.018
[0.15]
[0.43]
[0.13 to 0 46]
Turbine Wheel Radial Clearance
0.011
0.043
0.011 to 0.043
[0.28]
[1.09]
[0.28 to 1.091
Compressor Wheel Radial Clearance
0.005
0.033
0.005 to 0.033
[0.131
[0.84]
[0.13 to 0.841
Oil Seal Bore In Oil Seal/Diffuser Plate
1.000
1.002
0.0999 to 1.004
[25.401
[25.451
[25.37 to 25.50]
Oil Seal Sleeve Ring Groove
0.125
0.127
0.131
[3.181
[3.23]
[3.33]
Oil Seal Ring
0.123
0.124
0.122
[3.12]
[3.15]
[3.101
Shaft Ring Groove
0.126
0.128
0 132
[3.201
[3 251
[3.351
Assembly Torque Specifications
V-Band Clamp Tension
32/36 inch-lb
[3.6 to 4.1 Nm]
Rotor Assembly Lock nut Tension
20/24 ft-lb
[27 to 33 Nm]
Lubricating Oil Drain Fitting
50 ft-lb
[68 Nm]
Oil Inlet Fitting
20 ft-lb
[27 Nm]
Diffuser Plate Capscrew Torque
5-7 ft-lb
[7 to 10 Nm]
Note: Many parts grow due to swedging action or shrink after operation, therefore. the wear limits are established to allow
for these stress relaxation changes.
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