HARNESS AS-ENGINE 4998506 - Caterpillar

Removal Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A 9U-7241 Valve Spring Compressor 1
B 441-0714 Tool As 1 Start By:
Remove the electronic unit injectors.
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Note: Place the piston at the top of the compression stroke (TC). Remove the valve springs for that cylinder. If the valves fall into the cylinder liner, then the cylinder head must be removed.
Position the No. 1 piston at the top center of the compression stroke. Refer to Testing and Adjusting, "Finding Top Center Position for No. 1 Piston".
Illustration 1 g01073852
Illustration 2 g01043625
Personal injury can result from being struck by parts propelled by a released spring force.Make sure to wear all necessary protective equipment.Follow the recommended procedure and use all recommended tooling to release the spring force.
Install Tooling (A) in the electronic unit injector sleeve. Secure Tooling (A) with unit injector clamp (1).
Tighten the full nut until valve spring keepers (3) are loose on valve (2).
Remove valve spring keepers (3) from the valve.
Carefully remove Tooling (A).
Remove valve rotator (4).
Remove outer valve spring (6) and inner valve spring (5) from the valve.
Remove washer (7) from the valve guide.
Use Tooling (B) to check the valve springs (spring force). Refer to Specifications, "Cylinder Head Valves" for additional information on the valve springs.Installation Procedure
Table 2
Required Tools
Tool Part Number Part Description Qty
A 9U-7241 Valve Spring Compressor 1
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Lubricate the valve stems with clean engine oil.
Illustration 3 g01043625
Improper assembly of parts that are spring loaded can cause bodily injury.To prevent possible injury, follow the established assembly procedure and wear protective equipment.
Ensure that washer (7) is installed on the valve guide.
Install inner valve spring (5) and outer valve spring (6) on valve (2).
Install valve rotator (4) on valve (2).
The valve spring keepers can be thrown from the valve when the valve spring compressor is released. Ensure that the valve spring keepers are properly installed on the valve stem. To help prevent personal injury, keep away from the front of the valve spring keepers and valve springs during the installation of the valves.
Use Tooling (A) to compress inner valve spring (5) and outer valve spring (6). Install valve spring keepers (3) on valve (2). Remove unit injector clamp (1) and Tooling (A).End By:
Install the electronic unit injectors.