CYLINDER GP-LIFT 3492514 - Caterpillar

1. Remove the variable timing unit cover (1).2. Remove the variable timing unit drive gear, retainer, mounting bolts, and lock.3. Remove the variable timing unit retaining plate, bolts and locks. Remove the variable timing unit.Install Variable Timing Unit
1. Position the variable timing unit (1) in engine, and install retaining plate, bolts and locks.2. Install the drive gear, retainer, mounting bolts and lock. Do not tighten the bolts.3. Time the fuel injection pump camshaft to the engine. See FUEL INJECTION PUMP CAMSHAFT TIMING in TESTING AND ADJUSTING.4. Install the variable timing unit cover.concluding step:a) install governorDisassemble Variable Timing Unit
preparatory step:a) remove variable timing unit1. Drive weight retaining pins from shaft assembly and remove the weights (1). 2. Remove the plug (2). Using a screwdriver, apply pressure and turn retainer (3). Remove the retainer and spring (4).3. Pull the piston assembly out of shaft assembly.4. Remove the coupling retaining pin (5). Rotate coupling (6) clockwise and remove from the piston assembly.5. Remove the nut retaining pin (7). Remove the nut (8), spring (9) and valve (10) from the piston assembly (11).Assemble Variable Timing Unit
1. Install the valve, spring and nut on piston assembly. Adjust the nut until the distance (X) between bottom face of nut and piston is 1.760 .010 in. (44.70 0.25 mm) on (4S9498) Units and 1.914 .010 in. (48.62 0.25 mm) on (4N6680) Units. Drill a .095 .002 in. (2.41 0.05 mm) diameter hole through the nut and threaded portion of piston assembly. Install retaining pin. 2. Install the coupling tight against the nut. Measure .156 in. (3.96 mm) from the top face of nut and mark this location on coupling. Drill a .095 .002 in. (2.41 0.05 mm) diameter hole through the coupling and threaded portion of piston assembly at this location. Install retaining pin.3. Install the piston assembly in shaft assembly. Install the retainer and spring. Install plug.4. Position the weights on shaft assembly and install the retaining pins. Stake the retaining pins at one place on both ends of pin hole in shaft assembly. Each weight must pivot freely on its pin when installed.concluding step:a) install variable timing unit