GEAR-SUN 1912683 - Caterpillar

Illustration 1 g01255050
Typical example
(1) Crankshaft gear
(2) Crankshaft
(3) Crankshaft thrust washers Maximum permissible temperature of the gear for installation on the crankshaft ... 180 °C (356 °F)The end play of a new crankshaft ... 0.05 to 0.38 mm (0.002 to 0.015 inch)Maximum crankshaft end play ... 0.51 mm (0.020 inch)Standard thickness of thrust washer ... 2.26 to 2.31 mm (0.0890 to 0.0909 inch)Oversize thickness of thrust washer ... 2.45 to 2.50 mm (0.0965 to 0.0984 inch)
Illustration 2 g01335806
Typical example
Table 1
The Undersize Diameter of the Crankshaft Journals
NUMBER 0.25 mm (0.010 inch) 0.51 mm (0.020 inch) 0.76 mm (0.030 inch)
1 75.926 to 75.905 mm (2.9892 to 2.9884 inch) 75.672 to 75.651 mm (2.9792 to 2.9784 inch) 75.418 to 75.397 mm (2.9692 to 2.9684 inch)
2 63.236 to 63.216 mm (2.4896 to 2.4888 inch) 62.982 to 62.962 mm (2.4796 to 2.4788 inch) 62.728 to 62.708 mm (2.4696 to 2.4688 inch)
3 40.551 mm (1.5965 inch) maximum N/A N/A
4 39.47 mm (1.5539 inch) maximum N/A N/A
5 39.47 mm (1.5539 inch) maximum N/A N/A
6 44.68 mm (1.7591 inch) maximum N/A N/A
7 Do not machine this diameter. Do not machine this diameter. Do not machine this diameter. Item (6) in table 1 can be repaired with a crankshaft wear sleeve. Refer to Disassembly and Assembly, "Crankshaft Wear Sleeve (Rear) - Remove and Install" for more information.
Table 2
Minimum Width of machined Area of Crankshaft Web
Web 1, 2, 3, 6 and 7 4 and 5 8
18.31 mm
(0.7209 inch) 19.11 mm
(0.7524 inch) 26.61 mm
(1.0476 inch) If necessary, machine the thrust face in order to remove damage. Refer to table 2 for information.Refer to table 3 for the run out of the crankshaft journals.
Table 3
Journal Run out of the Journals
(1) Mounting
(2) 0.08 mm (0.0031 inch)
(3) 0.15 mm (0.0059 inch)
(4) 0.08 mm (0.0031 inch)
(5) Mounting The radii of all the crankshaft journals must be machined. This machining must return the crankshaft to the original standard. The radii must give a smooth transition from the journal to the side machined face.
Illustration 3 g01335807
Typical example
The edge of the oil holes (4) must be machined to the original standard after machining of the crankshaft.Oil hole The maximum radius of the edge of the oil hole ... 0.5 mm (0.0197 inch)Surface finish of all journals ... Ra 0.2 micronsSurface finish of all radii ... Ra 0.4 microns Inspect the crankshaft for structural cracking after machining.Refer to Specifications, "Connecting Rod Bearing Journal" for more information on the connecting rod bearing journals and connecting rod bearings.Refer to Specifications, "Main Bearing Journal" for information on the main bearing journals and for information on the main bearings.