TUBE AS 4986269 - Caterpillar

Do not turn the crankshaft while the valve springs are removed.
Note: Valve springs must be replaced in pairs for the inlet valve or the exhaust valve of each cylinder. If all valve springs require replacement the procedure can be carried out on two cylinders at the same time. The procedure can be carried out on the following pairs of cylinders. 1 with 4 and 2 with 3. Ensure that all of the valve springs are installed before changing from one pair of cylinders to another pair of cylinders.
Illustration 1 g01343550
Typical example
Apply sufficient pressure to Tooling (B) in order to allow removal of valve keepers (1). Remove valve keepers (1). Note: Do not compress the spring so that valve spring retainer (2) touches the valve stem seal.
Slowly release the pressure on Tooling (B).
Remove valve spring retainer (2) and remove valve spring (3).
If necessary, remove the valve stem seals.
Repeat Steps 2 through 5 in order to remove the remaining valve spring from the appropriate cylinder.
Remove Tooling (B). Installation Procedure
Table 2
Required Tools
Tool Part Number Part Description Qty
A(1) 9U-6198 Crankshaft Turning Tool 1
A(2) 9U-7336 Housing 1
5P-7305 Engine Turning Tool 1
B 9U-6195 Valve Spring Compressor 1
268-1969 Adapter 1
276-1221 Head 1
(1) The Crankshaft Turning Tool is used on the front pulley.
(2) This Tool is used in the aperture for the electric starting motor.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.
Do not turn the crankshaft while the valve springs are removed.
Inspect the valve springs for the correct length. Refer to Specifications, "Cylinder Head Valves " for more information.
If necessary, install a new valve stem seal onto the valve guide. Note: The outer face of the valve guide must be clean and dry before installing the valve stem seal.
Illustration 2 g01343550
Typical example
Install valve spring (3) onto the cylinder head. Position valve spring retainer (2) onto valve spring (3).
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 Tooling (B) in the appropriate position on the cylinder head in order to compress the valve spring.
Ensure that the valve spring is compressed squarely or damage to the valve stem may occur.
Apply sufficient pressure to Tooling (B) in order to install valve keepers (1). Install valve spring keepers (1). Note: Do not compress the spring so that valve spring retainer (2) touches the valve stem seal .
Carefully release the pressure on Tooling (B). Note: Ensure that the valve keepers are correctly seated.
Repeat Steps 2 to 6 for the remaining valves.
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.
Remove Tooling (B). End By:
Install the rocker shaft assembly.