SEAL 4431128 - Caterpillar

Removal Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A 176-5487 Valve Spring Compressor 1 Start By:
Remove the unit injector. Refer to Disassembly and Assembly, "Unit Injector - Remove".
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Note: The following procedure is for the removal of the inlet valve springs and the exhaust valve springs without removing the cylinder head. This procedure can be performed on only one cylinder at a time. This will prevent the inlet valves and the exhaust valves from falling into the cylinder.
Rotate the crankshaft in order to bring the piston to the top center position in the cylinder.
Illustration 1 g01167733
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.
Use Tooling (A) in order to compress the inlet valve springs and the exhaust valve springs.
Remove retainer locks (2).
Remove Tooling (A).
Remove spring retainer (3).
Remove inner valve spring (4) and outer valve spring (5) from each valve (1). Remove the valve spring seats from the cylinder head.
Install the inlet valve springs and the exhaust valve springs before you rotate the crankshaft. Installation Procedure
Table 2
Required Tools
Tool Part Number Part Description Qty
A 176-5487 Valve Spring Compressor 1
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Install the valve spring seats for the inlet valve springs and the exhaust valve springs.
Illustration 2 g01167733
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.
Install inner valve spring (4) and outer valve spring (5) on each valve (1).
Install spring retainer (3).
Use Tooling (A) in order to compress the inlet valve springs and the exhaust valve springs.
Install retainer locks (2). End By:
Install the unit injector. Refer to Disassembly and Assembly, "Unit Injector - Install".