CONVERSION G 3V3377 - Caterpillar

Removing the Air Compressor Cylinder Head
Illustration 1 g01269091
(1) Screw (unloader cap) (2) Unloader cap (3) Gasket (unloader cap) (4) Bore for the unloader piston (5) Balance piston (6) Cylinder head bolt (7) Cylinder head (8) Spring for the balance piston (9) Head gaskets (10) O-ring (11) Cooling plate (12) Unloader piston (13) Valve plate (14) O-ring (15) Inlet reed valve/gasket (16) O-ring
Before you disconnect any line from the air compressor, purge the system of pressurized air.Failure to purge the pressurized air before you service the air compressor can result in personal injury.
To help prevent personal injury when the tooling is removed, relieve all pressure in the system slowly by using an air regulator and a valve assembly.
Note: It is not necessary to remove the cylinder head in order to replace the unloader piston. Refer to Service Manual, "Unloader Piston - Remove".The air compressor has a service kit for the unloader piston. The service kit includes the gasket for the unloader cap, the balance piston, the spring for the balance piston, the unloader piston and the rubber O-rings.The air compressor has a service kit for the cylinder head gasket. The service kit contains the inlet reed valve/gasket and two cylinder head gaskets.The O-ring for the end cover and the gasket for the crankcase cover are also available.
Personal injury can result from air pressure.Personal injury can result without following proper procedure. When using pressure air, wear a protective face shield and protective clothing.Maximum air pressure at the nozzle must be less than 205 kPa (30 psi) for cleaning purposes.
Clean the exterior of the air compressor prior to any disassembly or repair. Mark the cylinder head and the crankcase with a scribe mark. Ensure that the proper repair kits are available prior to disassembly. Remove the air lines and the coolant lines from the cylinder head. Save the fittings for the air lines and the fittings for the coolant lines. Use the fittings in order to reassemble the air compressor.
Hold the unloader cap (2) in place. Remove the screws (1) for the unloader cap. The unloader cap (2) will have spring pressure against the cap. Carefully remove the unloader cap (2) and the gasket (3) . Discard the gaskets (3) .
Remove the balance piston (5) and the spring (8) . Discard the balance piston (5) and the spring (8) . Remove the four cylinder head bolts (6) . Gently tap the cylinder head with a soft faced hammer. This will break the gasket seal. Lift the cylinder head (7) , cooling plate (11) , and valve plate (13) from the crankcase. Remove the inlet reed valve/gasket (15) from the crankcase.
Gently tap the cylinder head (7) , cooling plate (11) , and the valve plate (13) in order to separate the three parts. Remove the top head gasket (9) between the cylinder head (7) and the cooling plate (11) . Also remove the bottom head gasket (9) between the cooling plate (13) and valve plate (13) . Remove any gasket material from the