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TO4 Turbocharger's Technical Data


Technical data for Model TO4 by Garrett

Tolerances
PartInches Millimeters
Min.Max.Min. Max.
Compressor wheel
Bore diameter 0,2498 0,2501 6,3450 6,3530
Back plate
Piston ring bore diameter 0,4995 0,5005 12,6870 12,7130
Bearing housing
Piston ring bore diameter ( step ) 0,7090 0,7110 18,0100 18,0600
Piston ring bore diameter ( smooth ) 0,6990 0,7010 17,7500 17,8100
Bearing bore diameter 0,6220 0,6223 15,7990 15,8060
Oil seal ring gap 0,0080 0,0150 0,2000 0,3800
Shaft and wheel
Piston ring groove width 0,0645 0,0685 1,6380 1,7400
Journal diameter 0,3997 0,4000 10,1520 10,1600
Seal hub diameter 0,6790 0,6840 17,2500 17,3700
Eccentricity of small diameter 0,0000 0,0005 0,0000 0,0130
Thrusth collar
Thrust bearing groove width 0,1740 0,1748 4,4200 4,4400
Piston ring groove width 0,6380 0,6530 1,6210 1,6590
Diameter (I.D.) 0,2501 0,2505 6,3530 6,3630
Thrust bearing groove diameter 0,3700 0,3800 9,4000 9,6500
Piston ring groove diameter 0,4050 0,4100 10,2900 10,4100
Thickness 0,7220 0,7240 18,3400 18,3900
Parallelism between faces 0,0001 0,0030
Clearances
PartInches Millimeters
Min.Max.Min. Max.
Rotor
Axial end play 0,0050 0,0040 0,0250 0,1020
Radial bearing clearance 0,0030 0,0065 0,0760 0,1650
Torques
PartPounds per Inch Newtons per meter
Min.Max.Min. Max.
Bolts
turbine housing 100,0 130,0 11,3 14,7
backplate 75,0 90,0 8,5 10,2
Shaft nut
1st - Tighten to 18,0 20,0 2,0 2,3
V clamp
compressor housing 40,0 80,0 4,5 9,0

 


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