3304B & 3306B GENERATOR SET ENGINES Caterpillar


Valve Rocker Arms And Lifters

Usage:

(1) 4B4910 Spring (new):

Length under test force ... 69.85 mm (2.750 in.)

Test force ... 62.3 to 71.2 N (14 to 16 lb.)

Free length after test ... 101.6 mm (4.00 in.)

Outside diameter ... 24.6 mm (.97 in.)

(2) 9H1112 Spring.

(3) 9M4886 Washer.

Use as required to obtain a 1.50 ± 0.25 mm (.059 ± .010 in.) assembled length of the 9H1112 Spring (2)

(4) Clearance for valves:

Intake valves ... 0.38 mm (.015 in.)

Exhaust valves ... 0.64 mm (.025 in.)

(5) Torque for locknut on valve adjustment screw ... 29 ± 7 N·m (22 ± 5 lb ft)

(6) Bore in bearing for shaft (new) ... 18.448 ± 0.013 mm (.7263 ± .0005 in.)

Diameter of shaft (new) ... 18.402 ± 0.013 mm (.7245 ± .0005 in.)

Maximum permissible clearance between bearing and shaft (worn) ... 0.20 mm (.008 in.)

(7) Diameter of valve lifter (new) ... 33.287 ± 0.013 mm (1.3105 ± .0005 in.)

Bore in block for valve lifter (new) ... 33.388 ± 0.050 mm (1.3145 ± .0020 in.)

Maximum permissible clearance between lifter and bore for valve lifter (worn) ... 0.30 mm (.012 in.)

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