C2.4 Tier 4 Final Engines for Caterpillar Built Machines Crankshaft Caterpillar


Crankshaft
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C2.4 Tier 4 Final Engines for Caterpillar Built Machines [M0067750]
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


Illustration 1g02848744
(1) Bolts

Note: Apply engine oil to the threads and seats of the bolts for the main bearings.

Table 1
Torque for main bearing bolts  46 N·m (34 lb ft) to 50 N·m (37 lb ft) 


Illustration 2g02848747
(2) Bolts

Table 2
Torque for three bolts
NOTE: Apply engine oil to the threads and seats of the bolts. 
69 N·m (51 lb ft) to 73 N·m (54 lb ft) 


Illustration 3g02848749
(3) Bolts

Note: Apply engine oil to the threads and seats of the bolts for the main bearing case cover.

Table 3
Torque for bolts for the main bearing case cover  24 N·m (18 lb ft) to 27 N·m (20 lb ft) 

Side Clearance of Crankshaft



    Illustration 4g02811358
    (4) Dial Indicator

  1. Set a dial indicator with the point on the end of the crankshaft.

  2. Move the crankshaft to the front and rear to measure the side clearance.

  3. If the measurement is more than the allowable limit, replace the thrust bearings.

    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 

Oversized Dimensions of Crankshaft Journals



Illustration 5g02811376

Table 5
Oversize  0.2 mm (0.008 inch)  0.4 mm (0.02 inch) 
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 

Crankshaft Bend



    Illustration 6g02811379
    (5) Dial Indicator
    (6) V Blocks

  1. Hold the two end journals of crankshaft with V blocks on the surface plate.

  2. Set a dial indicator with the point on the middle journal.

  3. Turn the crankshaft slowly and read the variation on the indicator.

    Table 6
    Allowable limit for crankshaft bend  0.02 mm (0.0008 inch) 

  4. If the measurement is more than the allowable limit, replace the crankshaft.

Oil Clearance Between the Crankshaft Pin and the Crankshaft Pin Bearing



Illustration 7g02840061

  1. Clean the crankshaft pin and crankshaft pin bearing.

  2. Put a strip of Plastigage on the center of the crankshaft pin.

  3. Install the connecting rod cap and tighten the connecting rod bolts to the specified torque, and remove the cap again.

  4. Measure the width that it becomes flat with the scale to get the oil clearance.

  5. If the oil clearance is more than the allowable limit, replace the crankshaft pin bearing.

    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) 

  6. 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.

  7. When you tighten the connecting rod bolts, do not move the crankshaft.


Illustration 8g02840279

Table 8
Undersize Dimensions of Crankpin 
Undersize  0.2 mm (0.008 inch)  0.4 mm (0.02 inch) 
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



Illustration 9g02847958
(7) External Micrometer

  1. Measure the outside diameter of the crankshaft journal with an external micrometer.

    Table 9
    Crankshaft journal outside diameter (New)  59.921 to 59.940 mm (2.3591 to 2.3598 inch) 


    Illustration 10g02847961
    (8) Internal Micrometer

  2. Measure the inside diameter of the crankshaft bearing with an internal micrometer.

    Table 10
    Crankshaft bearing 1 inside diameter (New)  59.980 to 60.039 mm (2.3615 to 2.3637) inch 

  3. Calculate the oil clearance.

  4. If the oil clearance is more than the allowable limit, replace the crankshaft bearing 1.

    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



Illustration 11g02847964

Table 12
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



    Illustration 12g02848477

  1. Put a strip of Plastigage on the center of the journal.

  2. 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.

  3. Measure the width that it becomes flat with the scale to get the oil clearance.

  4. If the oil clearance is more than the allowable limit, replace the crankshaft bearing 2.

    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) 

  5. If the same dimension bearing is not applicable because of the crankshaft journal wear, replace it with an undersize one.

Undersize Dimensions of Crankshaft Journal



Illustration 13g02848478

Table 14
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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