RADIATOR & HYD OIL COOLER GP 1355675 - Caterpillar

The timing position that was set at the factory is used to set the engine at the top center position for the No. 1 cylinder on the compression stroke before the fuel injection pump is removed.
Illustration 1 g00309804
Fuel injection pump with timing pin (typical example)
(1) Timing pin
(3) Hub nut
(4) Hole in the body of the fuel injection pump for the timing pin
(6) Hub slot
Illustration 2 g00309806
Timing gear and hub of the fuel injection pump (Lucas and Stanadyne)
(1) Timing pin
(2) Torx screws
(3) Hub nut
(4) Hole in the body of the fuel injection pump for the timing pin
(5) Slot in the timing gear for the timing pin
(6) Hub slot Note: Do not remove hub nut (3) from the shaft of the fuel injection pump. The hub of the fuel injection pump is installed on the shaft of the fuel injection pump at the factory in order to ensure that the fuel injection pump is in the correct position for timing. If the hub is removed, the hub will need to be accurately installed on the shaft of the fuel injection pump by the use of special equipment. Refer to your Caterpillar Dealer for repairs to the fuel injection pump.Note: Do not loosen torx screws (2). If the torx screws are loosened and the timing plate is moved, the timing position that is set at the factory will be lost. If the torx screws are loosened, the engine must be set to the top center position of the No. 1 cylinder on the compression stroke before the torx screws are tightened.
Remove the water pump. Refer to the Disassembly and Assembly Module, "Water Pump - Remove" topic.
Remove the valve mechanism cover. Refer to the Disassembly and Assembly Module, "Valve Mechanism Cover - Remove and Install" topic.
Rotate the crankshaft in a clockwise direction until the inlet valve for the No. 1 cylinder closes.
Slowly rotate the crankshaft until the slot in fuel injection pump gear (5) and hub slot (6) are aligned with the hole in the body of fuel injection pump (4). Note: The position of the slot in the fuel injection pump gear, the hub slot and the hole in the body of the fuel injection pump are on the bottom of the fuel injection pump. The slot in the fuel injection pump gear is for inserting the timing pin. The position of the slot is for the Lucas fuel injection pump and the Stanadyne fuel injection pump.
Insert timing pin (1) through the slot in the fuel injection pump gear and through the hub slot into the hole in the body of the fuel injection pump. When the timing pin is inserted all the way, the engine is at the top center position of the No. 1 cylinder on the compression stroke. No resistance should be felt when the timing pin is inserted into the hole in the body of the fuel injection pump (4). The timing pin should be inserted all the way into the hole in the body of the fuel injection