Wabco Air Compressors Caterpillar

Cylinder Head Removal

The Wabco 250 cc air compressor and the Wabco 318 cc air compressor have a service kit for the head assembly. The service kit includes the cylinder head assembly, new head bolts, coolant seals, and the gasket for mounting the air compressor, and the gasket for mounting the rear drive.

Illustration 1	g00803237
250 cc

Illustration 2	g00803239
318 cc

1. Remove the four head bolts (1). Discard the original head bolts (1). Do not remove the smaller bolts (2) .

2. Remove the original cylinder head assembly (3). Remove the head gasket (4). Remove any gasket material from the cylinder block of the air compressor.

3. Note the position of the ports (5) in reference to the crankcase. Remove the fittings for the air lines and the fittings for the coolant lines from the cylinder head. Save the fittings for the air lines and the fittings for the coolant lines. Use the fittings on the new cylinder head assembly.

4. Rotate the crankshaft (6) until the piston in the crankcase of the air compressor is at the top of the cylinder bore. Remove any accumulated carbon deposits and varnish by carefully scraping the top of the piston. Solvent may also be used to remove the deposits. Avoid allowing solvents and debris into the clearance between the cylinder bore and the piston. Avoid using abrasive cleaners to clean the deposits from the piston. Abrasive cleaners may leave abrasive grit that will shorten the life of the air compressor.