VALVE GP 3599601 - Caterpillar

Automatic Timing Advance is only used on engines equipped with a twin turbocharger arrangement.1. Turn the engine counterclockwise (as seen from the flywheel end of the engine) with tool (A) until the No. 1 piston is at top center (TDC) on the compression stroke. Install the timing bolt. Install 6V2112 Timing Pin through the hole in the injection pump housing. See the topic, Finding Top Dead Center Compression Position for No. 1 Piston in SENR4652 Testing and Adjusting. Tool (B), 6V2112 Timing Pin, replaces 6V6019 Timing Pin. 2. Remove two bolts (1).3. Remove eleven bolts (2) and cover (3). 4. Remove four bolts (5), retainer (6), and automatic timing advance (4).Install Automatic Timing Advance
1. Install automatic timing advance (4). Install retainer (6) and four bolts (5).2. Tighten the bolts (5) with fingers until there is a small amount of friction (a slight drag) between the retainer and the timing advance unit (4). This friction will hold the unit against the timing gears. The friction prevents play (backlash) when the gears are turned to the correct position.3. Remove the timing bolt. Turn the flywheel until the timing pin will go into the groove in the injection pump camshaft.4. With the timing pin installed, turn the flywheel clockwise (opposite the direction of engine rotation) a minimum of 30 degrees. The reason for this step is to be sure the play is removed from the timing gears when the engine is put on top center (TDC).5. Turn the flywheel in the direction of engine rotation until the No. 1 piston of the engine is on top center compression stroke. Then turn the timing bolt into the threaded hole in the flywheel.6. Tighten bolts (5) to 25 N m (20 lb ft). Then remove the timing pin from the injection pump housing.7. Tighten bolts (5) to 105 15 N m (77 11 lb ft). Then, remove the timing bolt from the flywheel.8. Turn the crankshaft two complete revolutions and check the timing again to see that the timing pin will go into the groove in the injection pump camshaft with the bolt in the flywheel.9. If the timing is not correct, repeat Steps 1 through 7. If timing is correct, Be Sure To Remove Timing Pin And Timing Bolt. 10. Install eleven bolts (2) and cover (3).11. Install two bolts (1).Disassemble Automatic Timing Advance
Start By:a. remove automatic timing advance 1. Remove flange assembly (1). 2. Remove two springs (2) and two weights (3) from the drive gear assembly (4). 3. Remove two slides (5) from pistons (6).4. Separate the drive gear (4) from the advance sleeve (7).Assemble Automatic Timing Advance
1. Put weights (3) in position in flange assembly (1), as shown.2. Install springs (2) in flange assembly (1). 3. Use 1P808 General Purpose Lubricant to hold slides (5) in position on gear assembly (4). Install slides (5) on pistons (6). 4. Install gear assembly (4) on flange assembly (1). Make sure slides (5) fit in grooves of the weights.