3056E Industrial Engine Caterpillar

Crankshaft

Usage:

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Illustration 1	g00979485
The crankshaft

(1) Crankshaft

The end play of the crankshaft ... 0.05 to 0.38 mm (0.002 to 0.015 inch)

Maximum crankshaft end play ... 0.51 mm (0.020 inch)

(2) Thrust washers

Standard thickness ... 2.26 to 2.31 mm (0.089 to 0.091 inch)

Oversize thickness ... 2.45 to 2.50 mm (0.096 to 0.098 inch)

(3) Crankshaft gear

Number of teeth on the crankshaft gear ... 28

Bore diameter of the crankshaft gear ... 47.625 to 47.650 mm (1.8750 to 1.8760 inch)

Maximum permissible temperature of the gear for installation on the crankshaft ... 180 °C (356 °F)

Note: Ensure that the timing mark on the crankshaft gear is visible when the gear is installed.

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Illustration 2	g00886525
Timing ring

(4) Locating dowel

(5) Timing ring

The temperature of the timing ring for installation ... 270 °C (518 °F)

The temperature of the timing ring for removal ... 207 to 250 °C (404 to 482 °F)

Note: All new crankshafts are nitrocarburised. The crankshaft can also be nitrided for 20 hours, if the nitrocarburised process is not available. After a crankshaft has been machined, the crankshaft must be rehardened. Inspect the crankshaft for cracks before machining and after machining.

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Table 1
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	75.905 mm (2.9884 inch) to 75.926 mm (2.9892 inch)	75.651 mm (2.9784 inch) to 75.672 mm (2.9792 inch)	75.397 mm (2.9684 inch) to 75.418 mm (2.9692 inch)
2	63.216 mm (2.4888 inch) to 63.236 mm (2.4896 inch)	62.962 mm (2.4788 inch) to 62.982 mm (2.4796 inch)	62.708 mm (2.4688 inch) to 62.728 mm (2.4696 inch)
3	39.47 mm (1.5539 inch)maximum	N/A	N/A
4	37.82 mm (1.4890 inch)maximum	N/A	N/A
5	44.68 mm (1.7591 inch)maximum	N/A	N/A
6	40.55 mm (1.5965 inch)maximum	N/A	N/A
7	133.17 mm (5.2429 inch)maximum	N/A	N/A
8	Do not machine this diameter.	N/A	N/A
9	3.68 mm (0.1449 inch) to 3.96 mm (0.1559 inch)	N/A	N/A