CONTROL GP-PILOT OPERATED HYD 1521832 - Caterpillar

Illustration 1 g03341307
Follow Step 1.a through Step 1.d in order to position the appropriate piston at top center.
Install Tooling (A) in position on the cylinder head in order to compress a valve spring for the appropriate piston.
Use Tooling (A) in order to compress valve spring (3) and open the valve slightly. Note: Do not compress the spring so that the valve spring retainer (2) touches the valve stem seal.
Carefully rotate the crankshaft until the piston touches the valve. Note: Do not use excessive force to turn the crankshaft. The use of force can result in bent valve stems.
Continue to rotate the crankshaft and gradually release the pressure on Tooling (A) until the piston is at the top center position. The valve is now held in a position that allows the valve spring to be safely removed.
Ensure that the valve spring is compressed squarely or damage to the valve stem may occur.
Note: 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.
Apply sufficient pressure to Tooling (A) in order to allow removal of the valve keepers (1). Note: Do not compress the spring so that the valve spring retainer (2) touches the valve stem seal.
Remove valve keepers (1).
Slowly release the pressure on Tooling (A).
Remove valve spring retainer (2) and remove valve spring (3).
Remove Tooling (A). Installation Procedure
Table 2
Required Tools
Tool Part Number Part Description Qty
A 9U-6195 Valve Spring Compressor 1
416-0288 Head 1
416-0292 Adapter 1
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.
Plug the apertures for the push rods in the cylinder head in order to prevent the entry of loose parts into the engine.
Install suitable plugs to the inlet ports of the cylinder head in order to prevent the entry of loose parts into the engine.
Inspect the valve springs for the correct length. Refer to Specifications, "Cylinder Head Valves " for the correct procedure.
Illustration 2 g03341307
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.
Ensure that the valve spring is compressed squarely or damage to the valve stem may occur.
Install Tooling (A) in the appropriate position on the cylinder head in order to compress the valve spring.
Apply sufficient pressure to Tooling (A) in order to install valve keepers (1). Note: Do not compress the spring so that valve spring retainer (2) touches the valve stem seal.Install the valve spring keepers.
Carefully release the pressure on Tooling (A). Note: Ensure that the valve keepers are correctly seated.
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