G342 ENGINE Caterpillar


Valve Rocker Arms And Lifters

Usage:


TYPICAL ILLUSTRATION

(1) Turn nut until contact is made with washer, then turn an additional ... 21/4 Turns

(2) Torque for nuts that hold bracket for rocker arm shaft ... 30 ± 5 lb. ft.(40 ± 7 N·m)

(3) Clearance for valves:

Exhaust valves ... .028 in.(0.71 mm)

Intake valves ... .016 in.(0.41 mm)

(4) Torque for locknut on valve adjustment screw ... 40 ± 5 lb. ft.(55 ± 7 N·m)

(5) Diameter of shaft ... 1.223 to 1.224 in.(31.06 to 31.09 mm)

Bore in bearing for shaft ... 1.2260 ± .0005 in.(31.140 ± 0.013 mm)

Maximum permissible clearance between bearing and shaft ... .010 in.(0.25 mm)

(6) Torque for bolts that hold guide for valve lifter (follower) ... 32 ± 5 lb. ft.(43 ± 7 N·m)

(7) Diameter of guide for valve lifter (follower) ... 1.6875 ± .001 in.(42.862 ± 0.03 mm)

Bore in block for guide for valve lifter (follower) ... 1.691 ± .002 in.(42.95 ± 0.05 mm)

(8) Diameter of valve lifter (follower) ... .9965 ± .0005 in.(25.311 ± 0.013 mm)

Bore in guide for valve lifter (follower) ... .9995 ± .0005 in.(25.387 ± 0.013 mm)

Maximum permissible clearance between lifter (follower) and bore in guide ... .008 in.(0.20 mm)

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