TURBOCHARGER GP 3881993 - Caterpillar

Remove & Install Rocker Shaft Assemblies & Push Rods
Start By:a. remove valve coversb. remove fuel return manifold (Serial Numbers 90N1-90N6120 only) 1. Remove bolts (2) and rocker shaft assembly (3). Remove push rods (1). The following steps are for installation of the push rods and rocket shaft assemblies.2. Install push rods (1). Put rocker shaft assembly (3) in position on the engine.3. Put the fuel return manifold (if equipped) in position and install the clamps, the locks and bolts (2). Tighten the bolts to a torque of 24 7 N m (18 5 lb ft).4. Adjust the valve clearances until the inlet valve clearance is 0.38 mm (.015 in)and the exhaust valve clearance is 0.64 mm (.026 in). Tighten nuts (4) to a torque of 30 7 N m (24 5 lb ft). For more detailed information regarding the rocker shaft assemblies, see the topic "Valve Rocker Arms And Lifters" in the Specifications Manual.End By:a. install fuel return manifolds (Serial Numbers 90N1-90N6120 only)b. install valve coversDisassemble & Assemble Rocker Shaft Assemblies
Start By:a. remove rocker shaft assemblies and push rods 1. Remove bolts (1), locks (2) and the washers from each end of the rocker shaft. 2. Remove shaft (3) from bracket (4). 3. Remove rocker arm assemblies (7) and the washers from shaft (3).4. Remove screw (5) and nut (6) from rocker arm assemblies (7). The following steps are for assembly of the rocker shaft assemblies.5. Make sure the oil holes in rocker arm assemblies (7), rocker shaft (3), and bracket (4) are clean and free of all dirt and foreign material.6. Measure the bore of the bushing in each of the rocker arms. The bore must be 21.852 0.020 mm (.8603 .0008 in). The maximum permissible bore is 21.920 mm (.8630 in). Make a replacement of the arm and bushing as a unit if the bore is not correct. The arms and bushings cannot be ordered separately.7. Measure the diameter of the shaft at each of the rocker arm locations. The diameter must be 21.793 to 21.814 mm (.8580 to .8588 in). The minimum permissible diameter is 21.768 mm (.8570 in).8. Install screws (5) and nuts (6) into rocker arm assemblies (7). Turn the screws until they are 11.2 mm (.44 in)below the bottom of the rocker arm assemblies.9. Install rocker arm assemblies (7) and the washers on shaft (3).10. Put shaft (3) and rocker arm assemblies (7) in position on bracket (4) with the adjustment screws on the same side as the oil hole on the bottom of the bracket.11. Make sure the flat surfaces on shaft (3) are turned up. Install locks (2), the washers, and bolts (1). Tighten the bolts to a torque of 24 7 N m (18 5 lb ft). For more detailed information regarding the rocker shaft assemblies, see the topic "Valve Rocker Arms And Lifters" in the Specifications Manual.End By:a. install rocker shaft assemblies and push rods