VALVE AS-BALL 4590577 - Caterpillar

Note: Either Tooling (A) can be used. Use the Tooling that is most suitable.
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
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The correct location of valve bridges on valve stems is shown.
Clean valve bridges (3). Inspect the valve bridges for wear and damage. Replace any valve bridges that are worn or damaged.
Lubricate valve bridges (3) with clean engine oil.
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.
Install valve bridges (3) to the valve stems. 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.
Illustration 2 g03706857
Clean pushrods (6). Inspect the pushrods for wear and damage. Replace any pushrods that are worn or damaged.
Apply clean engine oil to both ends of pushrods (6). 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.
Failure to ensure that the crankshaft is set in the safe position will result in interference between the pistons and the valves. Interference between the pistons and the valves will result in damage to the engine.
Use Tooling (A) in order to rotate the crankshaft in a clockwise direction and position the crankshaft at the safe position. Refer to System Operation, Testing and Adjusting, "Position the Valve Mechanism Before Maintenance Procedures" for the correct procedure.
Illustration 3 g03706858
Illustration 4 g02623177
Ensure that the rocker shaft assembly is clean and free from wear and damage.
Position the rocker shaft assembly with Spotfaces (Z) for Torx screws (4) in the up ward position.
Install Tooling (D) to rocker shaft assembly.
Install Torx screws (4) in the rocker shaft in Positions (Y). Note: Ensure that the correct Torx screw (4) is installed to Position (X).
Illustration 5 g03706859
Illustration 6 g03703569
Illustration 7 g03703575
Sequence for tightening the bolts for the rocker shaft assembly
Ensure that ALL threaded inserts are fully unscrewed.
Damage to the engine will occur if all threaded inserts are not fully unscrewed.
Position rocker shaft assembly (5) onto the cylinder head. The retaining clip (8) should face the front of the engine. Ensure that the rocker shaft assembly (5) does not come into contact with the electronic unit injector identification tag (7). Note: Ensure that the threaded inserts are correctly seated in ends of the pushrods.
Use Tooling (C) in order to tighten Torx screws (4).
Remove Tooling (D) from rocker shaft assembly. Install remaining Torx screws (4). Use Tooling (C) in order to tighten the remaining Torx screws (4).
Tighten Torx screws (4) to a torque of 35 N m (26 lb ft) in the numerical sequence. Refer to Illustration 7.
Ensure that valve bridges (4) are still located correctly on the valve stems.
Illustration 8 g03703568
Use Tooling (B) in order to tighten threaded inserts (2) on all the rocker arms. Tighten the threaded