Crankshaft
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C2.4 Tier 4 Final Engines for Caterpillar Built Machines
[M0067750]
C2.4 Tier 4 Final Engines for Caterpillar Built Machines
Camshaft
C2.4 Tier 4 Final Engines for Caterpillar Built Machines
Piston and Rings
BASIC ENGINE
CRANKSHAFT GP
C2.4 Tier 4 Final Engines for Caterpillar Built Machines
Crankshaft
1.1. Side Clearance of Crankshaft
2.1. Oversized Dimensions of Crankshaft Journals
3.1. Crankshaft Bend
4.1. Oil Clearance Between the Crankshaft Pin and the Crankshaft Pin Bearing
5.1. Oil Clearance Between Crankshaft Journal and Crankshaft Bearing One
6.2. Undersize Dimensions of Crankshaft Journal
7.1. Oil Clearance between Crankshaft Journal and Crankshaft Bearing 2
8.2. Undersize Dimensions of Crankshaft Journal
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Illustration 1 | g02848744 |
(1) Bolts |
Note: Apply engine oil to the threads and seats of the bolts for the main bearings.
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Torque for main bearing bolts | |
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Illustration 2 | g02848747 |
(2) Bolts |
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Torque for three bolts
NOTE: Apply engine oil to the threads and seats of the bolts. |
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Illustration 3 | g02848749 |
(3) Bolts |
Note: Apply engine oil to the threads and seats of the bolts for the main bearing case cover.
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Torque for bolts for the main bearing case cover | |
- Set a dial indicator with the point on the end of the crankshaft.
- Move the crankshaft to the front and rear to measure the side clearance.
- If the measurement is more than the allowable limit, replace the thrust bearings.
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Table 4 Side clearance of crankshaft (New) 0.15 to 0.31 mm to 0.0059 to 0.012 inch Allowable limit 0.5 mm
0.02 inch
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Illustration 4 | g02811358 |
(4) Dial Indicator |
Oversized Dimensions of Crankshaft Journals
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Illustration 5 | g02811376 |
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Oversize | |
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Dimension A | 54.50 to 54.70 mm
2.146 to 2.153 inch |
54.60 to 54.80 mm
2.150 to 2.157 inch |
Dimension B | 26.20 to 26.25 mm
1.032 to 1.033 inch |
26.40 to 26.45 mm
1.040 to 1.041 inch |
Dimension C | 2.8 to 3.2 mm radius
0.11 to 0.12 inch radius |
2.8 to 3.2 mm radius
0.11 to 0.12 inch radius |
The crankshaft journal must be fine-finished to higher than Rmax = 0.4S |
- Hold the two end journals of crankshaft with V blocks on the surface plate.
- Set a dial indicator with the point on the middle journal.
- Turn the crankshaft slowly and read the variation on the indicator.
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Table 6 Allowable limit for crankshaft bend 0.02 mm (0.0008 inch) - If the measurement is more than the allowable limit, replace the crankshaft.
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Illustration 6 | g02811379 |
(5) Dial Indicator
(6) V Blocks |
Oil Clearance Between the Crankshaft Pin and the Crankshaft Pin Bearing
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Illustration 7 | g02840061 |
- Clean the crankshaft pin and crankshaft pin bearing.
- Put a strip of Plastigage on the center of the crankshaft pin.
- Install the connecting rod cap and tighten the connecting rod bolts to the specified torque, and remove the cap again.
- Measure the width that it becomes flat with the scale to get the oil clearance.
- If the oil clearance is more than the allowable limit, replace the crankshaft pin bearing.
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Table 7 Oil clearance between crankpin and crankpin bearing (New) 0.025 mm (0.0009 inch) to 0.087 mm (0.0034 inch) Allowable Limit 0.20 mm (0.0079 inch) Crankpin outside diameter (New) 46.959 mm (1.8488 inch) to 46.975 mm (1.8494 inch) Crankpin bearing inside diameter (New) 47.000 mm (1.8504 inch) to 47.046 mm (1.8522 inch) - If the same dimension bearing is not applicable because of the crankpin wear, replace it with an undersize one.
Note: Do not put the Plastigage into the crankpin oil hole.
- When you tighten the connecting rod bolts, do not move the crankshaft.
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Illustration 8 | g02840279 |
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Undersize Dimensions of Crankpin | ||
Undersize | |
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Dimension A | 3.3 mm (0.13 inch) radius to 3.7 mm (0.14 inch) radius | 3.3 mm (0.13 inch) radius to 3.7 mm (0.14 inch) radius |
Dimension B | 1.0 mm (0.040 inch) relief to 1.5 mm (0.059 inch) relief | 1.0 mm (0.040 inch) relief to 1.5 mm (0.059 inch) relief |
Dimension C | 46.759 mm (1.8409 inch) diameter to 46.775 mm (1.8415 inch) diameter | 46.559 mm (1.8331 inch) diameter to 46.575 mm (1.8336 inch) diameter |
The crankpin must be fine-finished to higher than Rmax = 0.4S |
Oil Clearance Between Crankshaft Journal and Crankshaft Bearing One
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Illustration 9 | g02847958 |
(7) External Micrometer |
- Measure the outside diameter of the crankshaft journal with an external micrometer.
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Table 9 Crankshaft journal outside diameter (New) 59.921 to 59.940 mm (2.3591 to 2.3598 inch) Show/hide tableIllustration 10 g02847961 (8) Internal Micrometer - Measure the inside diameter of the crankshaft bearing with an internal micrometer.
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Table 10 Crankshaft bearing 1 inside diameter (New) 59.980 to 60.039 mm (2.3615 to 2.3637) inch - Calculate the oil clearance.
- If the oil clearance is more than the allowable limit, replace the crankshaft bearing 1.
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Table 11 Oil clearance between crankshaft journal and crankshaft bearing 1 (New) 0.0400 to 0.118 mm (0.00158 to 0.00464 inch) Allowable Limit 0.20 mm (0.0079 inch)
Undersize Dimensions of Crankshaft Journal
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Illustration 11 | g02847964 |
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Undersize | 0.2 mm (0.008 inch) | 0.4 mm (0.02 inch) |
Dimension A | 2.8 to 3.2 mm radius 0.11 to 0.12 in. radius | 2.8 to 3.2 mm radius 0.11 to 0.12 in. radius |
Dimension B | 1.0 to 1.5 mm relief 0.040 to 0.059 in. relief | 1.0 to 1.5 mm relief 0.040 to 0.059 in. relief |
Dimension C | 59.721 to 59.740 mm dia. 2.3513 to 2.3519 in. dia. | 59.521 to 59.540 mm dia. 2.3434 to 2.3440 in. dia. |
The crankshaft journal must be fine-finished to higher than Rmax = 0.4S
Holes to be de-burred and edges rounded with 1.0 to 1.5 mm (0.040 to 0.059 in.) relief. |
Oil Clearance between Crankshaft Journal and Crankshaft Bearing 2
- Put a strip of Plastigage on the center of the journal.
- Install the bearing case and tighten the baring case screws 1 to the specified torque, and remove the bearing case again.
Note: When you tighten the bearing case screws, do not move the crankshaft.
- Measure the width that it becomes flat with the scale to get the oil clearance.
- If the oil clearance is more than the allowable limit, replace the crankshaft bearing 2.
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Table 13 Oil clearance between crankshaft and crankshaft bearing 2 (New) 0.0400 to 0.104 mm (0.00158 to 0.00409 inch) Allowable Limit 0.20 mm (0.0079 inch) Crankshaft journal outside diameter (New) 59.921 to 59.940 mm (2.3591 to 2.3598 inch) Crankshaft bearing 2 inside diameter (New) 59.980 to 60.025 mm (2.3615 to 2.3631 inch) - If the same dimension bearing is not applicable because of the crankshaft journal wear, replace it with an undersize one.
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Illustration 12 | g02848477 |
Undersize Dimensions of Crankshaft Journal
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Illustration 13 | g02848478 |
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Undersize | 0.2 mm (0.008 inch) | 0.4 mm (0.02 inch) |
Dimension A | 2.8 to 3.2 mm radius 0.11 to 0.12 in. radius | 2.8 to 3.2 mm radius 0.11 to 0.12 in. radius |
Dimension B | 1.0 to 1.5 mm relief 0.040 to 0.059 in. relief | 1.0 to 1.5 mm relief 0.040 to 0.059 in. relief |
Dimension C, D | 59.721 to 59.740 mm dia. 2.3513 to 2.3519 in. dia. | 59.521 to 59.540 mm dia. 2.3434 to 2.3440 in. dia. |
The crankshaft journal must be fine-finished to higher than Rmax = 0.4S
*Holes to be de-burred and edges rounded with 1.0 to 1.5 mm (0.040 to 0.059 in.) relief. |
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