COVER 7K1512 - Caterpillar

Many procedures (disassembly and assembly, testing and adjusting, etc.) require the timing of the engine or the engine components. The engines are considered in time when the following conditions are met:
The No. 1 cylinder is at the top center (TC) position on the compression stroke.
The crankshaft timing pin is engaged in the bracket which is attached to the crankshaft.
Both camshaft timing pins are engaged in the holes in the camshaft assemblies.Engine Rotation
When you view the engine from the flywheel end, The SAE standard engine crankshaft rotation is counterclockwise.Note: The front end of the engine is opposite the flywheel end of the engine.The left side and the right side are viewed from the flywheel end of the engine.Engine Prelubrication
Many service and inspection procedures require rotation of the engine crankshaft. The prelubrication of the engine is required when the crankshaft is rotated during normal maintenance operations. This includes adjusting the valves and starting the engine.The push button for the engine prelube is at the lower left-hand corner of the panel for the Engine Supervisory System. The push button provides a manual method to prelube the engine.DO NOT use the air or electric starting motors to rotate the engine. If the engine is rotated too fast, oil from the prelube pump will not be enough to protect the engine.Use the manual barring group to rotate the crankshaft for service work. Leave the prelube pump on during the time of crankshaft rotation. Damage can result if the crankshaft is rotated on dry bearing surfaces.
In order to avoid possible damage to the engine, the prelube pump should not be operated continuously for extended periods of time. During repairs, if the prelube pump has run for more than three hours continuously, any oil that may have collected in the cylinders and/or above the valves should be removed before attempting to start the engine.
Finding The Top Center Compression Position For No. 1 Cylinder
Illustration 1 g00311103
Location of the timing pin
(1) Manual barring group
(2) Storage position of the timing pin
Remove the crankshaft timing pin from the storage position (2). The storage position of the timing pin is located below the manual barring group (1). The manual barring group is on the right side of the rear housing.
Illustration 2 g00311105
Installation of the crankshaft timing pin
(3) Flywheel timing bracket
(4) Mounting bracket for the timing pin
(5) Timing pin
Use the manual barring group to turn the engine flywheel in the direction of normal engine rotation. Turn the engine until the crankshaft timing pin (5) can be installed through mounting bracket (4) for the timing pin . Ensure that the timing pin is engaged in flywheel timing bracket (3).Note: If the flywheel is turned beyond the point of installation in the flywheel timing bracket, the lash must be removed from the timing gears. Turn the flywheel in the opposite direction of normal rotation for approximately 20 degrees. Then turn the flywheel in the direction of normal engine rotation until the timing pin can be installed in the bracket assembly. This procedure ensures that the