PISTON-CLUTCH 3T3057 - Caterpillar

Remove Jacobs Engine Brake
Start By:a. remove valve covers Fluid Spillage ContainmentCare must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the machine. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to "Tools And Shop Products Guide", NENG2500 for tools and supplies suitable to collect and contain fluids in Caterpillar machines. Dispose fluids according to local regulations and mandates. 1. Disconnect solenoid lead wires (1) and (3) from the terminal in the Jacobs spacer.2. Remove eight Jacobs nuts (2) and four Jacobs bolts that hold the Jacobs spacers to the valve cover bases. Remove Jacobs spacers (4). Do Steps 3 through 10 for each end of the engine. The front half of the engine is shown.3. Remove four Jacobs studs (5) and Jacobs washers. Remove three bolts (6) and remove valve cover base (7). 4. Remove Jacobs nuts (8), Jacobs washers, Jacobs bolts (9), and the Jacobs washers that hold the Jacobs brake housing assembly in place.5. Remove Jacobs brake housing assembly (10). 6. Remove Jacobs head bolts (12), and remove Jacobs support brackets (11) from the cylinder head. 7. Remove inner fuel lines (13). 8. Remove Jacobs washers (14) and Jacobs shims (15) from the Jacobs stud assemblies. 9. Remove bolt (17) and two Jacobs stud assemblies (16) that hold the rocker shaft assembly to the head. Remove rocker shaft assembly (18). 10. Remove Jacobs exhaust valve bridges (20) from the exhaust valves only. The inlet valves have the Caterpillar inlet valve bridges. Remove the Caterpillar inlet valve bridges (19).Install Jacobs Engine Brake
Do each step for each end of the engine. The front half is shown.1. Put clean engine oil on the bridges and dowels.2. Install Jacobs exhaust valve bridges (20) and the Caterpillar inlet valve bridges (19) on the dowels.3. Keep hand pressure on the bridges, and turn the adjustment screw clockwise until contact is made with the valve stem. Turn the screw and extra 20 to 30 degrees. This will make the dowel straight in the guide and compensate for gap (slack) in the threads. Hold the adjustment screw in this position, and tighten the locknut to a torque of 28 4 N m (21 3 lb ft). 4. Put rocker shaft assembly (18) in position on the cylinder head. 5. Install Jacobs washers (21) on the Jacobs stud assemblies (16). Put clean oil on the threads, and install washer and bolt (17) and Jacobs stud assemblies (16). Tighten the center bolt and Jacobs stud assemblies in increments of 70 N m (50 lb ft)each until a final torque of 450 N m (330 lb ft)is obtained.6. Make an adjustment to he valves to have a clearance of 0.38 mm (.015 in)for the inlet valves and 0.76 mm (.030 in)for the exhaust valves. Tighten the locknuts to a torque of 28 4 N m (21 3 lb ft), and check