C3.3 Industrial Engine Caterpillar

Installation Procedure

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Illustration 1	g01288986
typical example

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Illustration 2	g01250795
typical example

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Illustration 3	g01288996
typical example

1. Apply clean engine lubricating oil to both ends of the pushrods (4). Install the pushrods (4).

   Note: Ensure that the pushrods (4) are installed in the original location and that the pushrods are seated in the valve lifters correctly.

2. If the rocker shaft was disassembled, install the Tooling (A) around the rocker arms (2) in order to slightly compress spring (3). The rocker arms (1) must be held away from the machined face of the cylinder head (5) during reassembly.

3. Loosen the nut (6) and the adjustment screw (7) on each rocker arm. This will help prevent a bent valve or a bent pushrod during the installation of the rocker shaft.

4. Position the rocker shaft assembly on the cylinder head.

   Note: The rocker shaft (3) of the rocker shaft assembly is not symmetrical. The rocker shaft (3) has a machined flat at the front end of the shaft. Ensure that the machined flat is toward the top and toward the front end of the engine.

5. Install the Torx screws (9) in the rocker shaft (3).

   Note: The longest Torx screw must be installed at the front of the cylinder head in the hole (X).

6. Ensure that the adjustment screws (7) are properly seated in the ends of the pushrods (6).

7. Alternately tighten the Torx screws (9). Start from the center and work toward the outside. Tighten the Torx screws (9) to a torque of 35 ± 3.5 N·m (25.8 ± 2.6 lb ft).

8. Cut and remove the Tooling (A) from the rocker shaft assembly.

9. Adjust the inlet valve lash to 0.20 mm (0.008 inch) and adjust the exhaust valve lash to 0.45 mm (0.018 inch). Refer to Testing and Adjusting, "Engine Valve Lash - Inspect/Adjust" for more information on adjusting the valve lash.

End By:

1. Install the valve mechanism cover. Refer to Disassembly and Assembly, "Valve Mechanism Cover - Remove and Install".