SWITCH GP-SIGNAL 1548696 - Caterpillar

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The following information will provide you with information on calibrating your gear train. Three gears have timing marks: crankshaft, idler and camshaft.
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Front of crankshaft gearThe crankshaft gear has 48 teeth. There are 7.5 degrees between the teeth. The crankshaft gear has a notch on the back side of the gear that aligns the gear on the crankshaft. The timing mark is located on the front of the crankshaft gear. The timing mark on the front of the gear is located from the center of the notch on the back side of the gear in a clockwise direction. The timing mark is located 19 teeth from the center of the notch. The angle (A) has a measurement of 144.67 degrees and starts in the middle of the notch. The angle represents the location of the timing mark. The notch is located on the back side of the crankshaft gear. The notch is not visible from the front of the crankshaft gear. The crankshaft gear on the engines with the serial number S/N:2KS is different. The crankshaft gears for these engines have a notch on the front and the back of the gear. Use the notch on the back of the crankshaft gear when you calibrate the timing marks. These engines were built for the 1999 model year.
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Idler gearThe idler gear has 71 teeth. There are 5.07 degrees between the teeth. There are 25.5 teeth between the two timing marks. Angle (B) represents the distance between the timing marks. Angle (B) has a measurement of 129.3 degrees.
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Camshaft gearThe camshaft gear has 96 teeth. There are 3.75 degrees between the teeth. The camshaft gear has a keyway that aligns the gear on the camshaft. The timing mark is located 25 teeth from the center of the keyway. The angle (C) has a measurement of 93.39 degrees and starts in the middle of the keyway. The angle represents the location of the timing mark.