REGULATOR AS-WATER TEMPERATURE 4973989 - Caterpillar

Illustration 1 g03824258
(1) Gear for the high-pressure fuel pump
(2) Camshaft gear
(3) Idler gear
(4) Crankshaft gear
(5) Auxiliary Water Pump Gear
(6) Timing marks Correct fuel injection timing and correct valve mechanism operation is determined by properly timing crankshaft gear (4) and camshaft gear (2) to idler gear (3). Also, high-pressure fuel pump gear (1) must be timed to camshaft gear (2). During installation of the front gear, timing marks (6) on idler gear (3) must be in alignment with the timing marks on crankshaft gear (4) and the timing marks on camshaft gear (2). The "0" mark on camshaft gear (2) must align with the timing mark on idler gear (3). The "V" mark on camshaft gear (2) must align with the "V" mark on fuel pump gear (1).Check the teeth on the timing reference gear. The teeth should not be defaced. The teeth should have sharp clean edges and the teeth should be free of contaminants.Note: The electronic injection timing must be calibrated after reassembly of the front gear train. Refer to Troubleshooting, "Engine Speed/Timing Sensor - Calibrate".