SEAL-LIP TYPE 0649021 - Caterpillar

Installation Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A 227-4389 E10 Torx Socket 1
B 235-0032 Feeler Gauge 1
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Clean the valve bridges. Inspect the valve bridges for wear or damage. Replace any valve bridges that are worn or damaged.
Illustration 1 g01794035
Illustration 2 g01794053
The correct location of valve bridges on valve stems is shown. The electronic unit injector is not shown for clarity.
Failure to ensure that ALL valve bridges are correctly seated onto the valve stems will cause interference between the pistons and the valves, resulting in damage to the engine.
Lubricate valve bridges (4) with clean engine oil. Install the valve bridges to the cylinder head.
Install valve bridges (4) to the cylinder head. If the valve bridges are equipped with shrouds (5), ensure that the shrouds are located correctly. Note: Install used valve bridges in the original location and in the original orientation. Ensure that the valve bridges are correctly seated on the valves. New valve bridges may be installed in either orientation.
Clean pushrods (3). Inspect the pushrods for wear or damage. Replace any pushrods that are worn or damaged.
Apply clean engine lubricating oil to both ends of pushrods (3). Install the pushrods to the engine with the cup upward. Note: Ensure that the pushrods are installed in the original location and that the ball end of each pushrod is correctly seated in the valve lifters.
Illustration 3 g01476297
Ensure that the rocker shaft assembly is clean and free from wear or damage. Install torx screws (1) in the rocker shaft.
Illustration 4 g01794061
Position rocker shaft assembly (2) onto the cylinder head. Retaining clip (7) should face the front of the engine. Note: Ensure that adjustment screws (6) are properly seated in the ends of pushrods (3).
Use Tooling (A) to gradually tighten torx screws (1). Note: To avoid distortion of rocker shaft assembly (2), tighten the torx screws in the center first. Work toward the outside of the rocker shaft assembly.Tighten the torx screws to a torque of 35 N m (26 lb ft).
Illustration 5 g01259267
Typical example
Use Tooling (B) in order to check the valve lash. If necessary, adjust the valve lash. Refer to Systems Operation, Testing and Adjusting, "Engine Valve Lash - Inspect/Adjust" for the correct procedure. End By:
Install the valve mechanism cover. Refer to Disassembly and Assembly, "Valve Mechanism Cover - Remove and Install".