UENR0623-02 85 Basic Engine i04175270 Gear Group - Inspect 4. Measure the backlash between the fuel injection pump gear (1) and the idler gear (2). Refer to Specifications, “Gear Group (Front)” for the backlash measurement. 5. Measure the end play on idler gear (2). Refer to Disassembly and Assembly, “Idler Gear - Install” for the correct procedure. Refer to Specifications, “Gear Group (Front)” for the end play measurement. i04338214 Crankshaft Pulley - Check The crankshaft pulley is installed on the front of the crankshaft. Replace the crankshaft pulley if any of the following conditions exist: There is movement of the crankshaft pulley.
There is a large amount of gear train wear that is not caused by lack of oil. Analysis of the engine oil has revealed that the front main bearing is badly worn. The engine has had a failure because of a broken crankshaft. Check the areas around the holes for the bolts in the crankshaft pulley for cracks or for wear and for damage. Illustration 76 g02859779 Typical example (3) Accessory drive gear (if equipped) (7) Oil pump gear Use the following steps in order to check the alignment and the runout of the crankshaft pulley: 1. Remove any debris from the front face of the crankshaft pulley. Remove any debris from the circumference of the crankshaft pulley. Note:
If one or more of the gears need to be removed for repair, refer to Disassembly and Assembly, “Gear Group (Front) - Remove” in order to remove the gears. Refer to the Disassembly and Assembly, “Gear Group (Front) - Install” in order to install the gears. 2. Mount the dial indicator on the front cover. Use the dial indicator to measure the outer face of the crankshaft pulley. Set the dial indicator to read 0.00 mm (0.00 inch). 1. Inspect the gears for wear or for damage. If the gears are worn or damaged, use new parts for replacement. 3. Rotate the crankshaft at intervals of 45 degrees and read the dial indicator. 2.
Measure the clearance between the crankshaft gear (5) and the camshaft gear (4). Refer to Specifications, “Gear Group (Front)” for the clearance measurement. 4. The difference between the lower measurements and the higher measurements that are read on the dial indicator at all four points must not be more than 0.18 mm (0.007 inch). 3. Measure the clearance between the idler gear (6) If the reading on the dial indicator is more than 0.18 mm (0.007 inch), inspect the pulley for damage. If the pulley is damaged, use new parts for replacement. for the oil pump and the crankshaft gear (5). Refer to Specifications, “Gear Group (Front)” for the clearance measurement.