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| Illustration 1 | g01117874 |
Front Gear Group (1) Camshaft gear and timing reference ring (2) Timing marks (3) Idler gear (4) Crankshaft gear | |
The basis for correct fuel injection timing and valve mechanism operation is determined by the timing reference ring, alignment of the front gear group, the personality module and the sensors. The timing reference ring is located on the end of the camshaft. The timing reference ring is used to measure crankshaft rotation. During installation of the front gear, timing marks (2) on idler gear (3) must be in alignment with the timing marks on crankshaft gear (4) and the timing marks on camshaft gear (1) .
Refer to Disassembly and Assembly, " Gear Group (Front) - Remove" and Disassembly and Assembly, " Gear Group (Front) - Install".
Note: If timing reference ring (1) is installed backward the engine will not start.
Check for proper alignment of the camshaft gear and timing reference ring (1) on the camshaft assembly. Inspect the key between the timing reference ring and the camshaft gear. Check the teeth on the timing ring. 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".