SHIM-LINER 8S4661 - Caterpillar

1. Loosen adjustment screws (3) to have maximum valve clearance.2. Remove six bolts (2) and washers that hold the rocker shaft in position.3. Remove rocker shaft assembly (1).4. Remove push rods (4). 5. Remove O-ring seal (5) from rear support bracket. The O-ring seal (5) must be a replacement each time the head bolt is removed from the rear support bracket.Install Rocker Shaft And Push Rods
1. Install a new O-ring seal in the rear support bracket of rocker shaft. 2. Install push rods (1).3. Put rocker shaft (2) in position on the cylinder head. Make sure dowels (3) are in alignment at both ends of the rocker shaft.4. Put 5P3931 Anti-Seize Compound on the threads of the bolts that hold the rocker shaft in position. Install the six bolts and washers. 5. Tighten all bolts (4), (5), (6), (7), (8), (9) in number sequence to a torque of 115 lb.ft. (155 N m). Tighten bolts again in number sequence to a torque of 185 13 lb.ft. (250 17 N m). Last, tighten the bolts again (hand turn only) in number sequence to a torque of 185 13 lb.ft. (250 17 N m).6. Make adjustments until the intake valve clearance is .015 in. (0.38 mm) and the exhaust valve clearance is .025 in. (0.64 mm).7. Check the torque on all of the cylinder head bolts. See CYLINDER HEAD in SPECIFICATIONS, for the correct procedure to tighten the cylinder head bolts.end by:a) install valve cover