3176 DIESEL TRUCK ENGINE Caterpillar


Turbocharger (S3A)

Usage:

(1) End play for shaft (new) ... 0.100 ± 0.018 mm (.0039 ± .0007 in)

Maximum permissible end play (worn) ... 0.20 mm (.008 in)

(2) Thickness of thrust bearing (where thrust rings contact bearing) ... 5.372 ± 0.013 mm (.2115 ± .0005 in)

(3) Tighten both band clamps with procedure that follows:

a. Tighten to ... 10.2 ± 0.7 N·m (90 ± 6 lb in)

b. Tap (hit) clamp lightly all around.

c. Tighten again to ... 10.2 ± 0.7 N·m (90 ± 6 lb in)


NOTICE

Do not overtighten the clamps.


(4) Diameter of shaft (new) ... 11.570 to 11.577 mm (.4555 to .4558 in)

Bore in the bearing (new) ... 11.608 to 11.618 mm (.4570 to .4574 in)

Maximum permissible clearance between bearing and shaft (worn) ... 0.05 mm (.002 in)

(5) Maximum permissible gap of oil seal ring, measured in bore of housing ... 0.25 mm (.010 in)

(6) Install the compressor wheel (at room temperature) as follows:

a. Put compressor wheel on the shaft.


NOTICE

Do not bend or add stress to the shaft when nut is loosened or tightened.


b. Remove nut from shaft and apply 6V1541 Quick Cure Primer on the threads of the shaft and nut followed by application of 9S3265 Retaining Compound.

c. Tighten nut to ... 24.4 ± 1.4 N·m (144 ± 4 lb in)

(7) Thickness of each thrust ring ... 2.5463 ± 0.0064 mm (.10025 ± .00025 in)

(8) Bore in housing (new) ... 19.050 to 19.075 mm (.7500 to .7510 in)

Outside diameter of the bearing (new) ... 18.936 to 18.948 mm (.7455 to .7460 in)

Maximum permissible clearance between bearing and bore in housing (worn) ... 0.15 mm (.006 in)

Torque for four nuts (put 5P3931 Anti-Seize Compound on threads) and bolts that hold turbocharger to exhaust manifold ... 70 ± 15 N·m (50 ± 11 lb ft)

NOTE: Put clean engine oil in the oil inlet of the turbocharger after assembly or before installation to provide start up lubrication and/or storage protection.

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