SEAL 2W8320 - Caterpillar

1. Loosen two set screws (1) and cover (2).2. Put alignment marks on head assembly (3) and on cylinder (5) and also on the cylinder and on crankcase (7) so parts can be put in correct location when they are assembled.3. Disconnect air line (4) and remove two bolts (8) and governor assembly (6). 4. Remove four nuts (9) and remove head assembly (3). If needed, hit head assembly (3) with a soft hammer and then remove the head assembly.Install Head Assembly
1. Install new gasket (4) on cylinder (2).2. Install head assembly (1) on cylinder (2). 3. Put alignment marks on the cylinder and head assembly together and tighten four nuts (8). Torque for nuts is 14 3 lb.ft. (1.9 0.4 mkg).4. Install governor assembly (6) on end cover (5) and tighten bolts (10). Torque for bolts is 10 lb.ft. (1.38 mkg). Connect air line (3) to head assembly (1).5. Tighten cover (7). Torque for cover is 60 lb.ft. (8.3 mkg).6. Tighten two set screws (9). Torque for set screws is 50 to 96 lb.in. (57.6 to 110.7 cm.kg).Disassemble And Assemble
start by: a) remove head assembly 1. Remove cover (7), unloader valve (1) and spring (2) from top half (3) of head and clean the unloader valve.2. Remove two set screws from top half (3) and hit either top half (3) or bottom half (4) with a soft hammer to separate the head.3. Remove and clean exhaust valve (5) and spring (6).4. Remove and clean inlet valve (8) and spring.5. Clean all of the passages in both top half (3) and bottom half (4).6. Place a new gasket (10), spring (6) and exhaust valve (5) on bottom half (4) of the head.7. Place inlet valve (8) and spring (9) on top half (3) of the head.8. Carefully put half (3) on half (4). Inlet valve (8) can be moved to the correct location with a rod through the opening for the unloader valve.9. Install the two set screws to hold the top half (3) and the bottom half (4) of the head together.10. Install unloader valve (1), spring (2) and cover (7) in the head.end by: a) install head assembly