GEAR (64 Teeth) 3K7021 - Caterpillar

Remove Rocker Shaft Assembly And Push Rods
START BY:a. remove valve cover
3304 Engine Shown1. Remove bolts (1) and the washers that hold rocker shaft assembly (2) in position.2. Remove rocker shaft assembly (2). Remove the O-ring seal from the rear rocker arm support bracket.3. Put identification marks on push rods (3) as to their location in the engine. Remove the push rods.Install Rocker Shaft Assembly And Push Rods
3304 Engine Shown1. Install push rods (1). Make sure they are in their original location in the engine and in position in the valve lifters.
Loosen the adjusting screws on the rocker arms. This will prevent a bent valve or push rod during installation of the rocker shaft assembly.
2. Install a new O-ring seal in the rear rocker arm support bracket. Put 2P2506 Thread Lubricant on all of the bolts that hold the rocker shaft assembly in position except for the bolt that goes through the rear rocker arm support bracket.3. Put rocker shaft assembly (2) in position on the engine. Make sure the dowels in the support brackets are in alignment with the dowel holes in the cylinder head. Make sure the rocker arms are engaged with the push rods.4. Install the bolts and washers that hold the rocker shaft assembly in position, and tighten them until they are finger tight.
3304 Engine Sequence
3306 Engine Sequence5. Tighten the bolts that hold the rocker shaft as follows:a. Tighten the bolts in number sequence to a torque of 156 N m (115 lb.ft.).b. Tighten the bolts in number sequence to a torque of 250 17 N m (185 13 lb.ft.).c. Tighten the bolts again in number sequence to a torque of 250 17 N m (185 13 lb.ft.).6. See Valve Clearance Setting in Testing And Adjusting. Make an adjustment to the valves so the intake valves have 0.38 mm (.015 in.) clearance and the exhaust valves have 0.64 mm (.025 in.) clearance.END BY:a. install valve cover