3064 and 3066 Engines for Caterpillar Built Machines Crankshaft Caterpillar


Crankshaft
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3064 and 3066 Engines for Caterpillar Built Machines [SENR5545]
BASIC ENGINE
CRANKSHAFT GP
3064 and 3066 Engines for Caterpillar Built Machines Main Bearing Journal
3064 and 3066 Engines for Caterpillar Built Machines Crankshaft


Illustration 1g01412588
(1) Crankshaft main bearing journal

Table 1
Main Bearing Journal 
Original size journal(1)  89.95 to 89.97 mm (3.541 to 3.542 inch) 
Undersize journal
0.25 mm (0.010 inch) 
89.70 to 89.72 mm (3.531 to 3.532 inch) 
Undersize journal
0.50 mm (0.020 inch) 
89.45 to 89.47 mm (3.521 to 3.522 inch) 
Undersize journal
0.75 mm (0.030 inch) 
89.20 to 89.22 mm (3.512 to 3.513 inch) 
(1) If the bearing journal has been ground beyond 89.85 mm (3.537 inch), then regrind the bearing journals to the next undersize journal.


Illustration 2g02157240
Measurement of connecting rod bearing journal

Table 2
Connecting Rod Journal 
Original Size  59.945 to 59.965 mm (2.36003 to 2.3608 inch) 
Undersize journal
0.25 mm (0.010 inch) 
59.695 to 59.715 mm (2.35019 to 2.35098 inch) 
Undersize journal
0.50 mm (0.020 inch) 
59.445 to 59.465 mm (2.34035 to 2.3411 inch) 
Undersize journal
0.75 mm (0.030 inch) 
59.195 to 59.215 mm (2.3305 to 2.3313 inch) 


Illustration 3g01412590

(2) Support the crankshaft in a set of vee blocks. Measure the runout dimension at the center journal. Maximum runout ... 0.10 mm (0.004 inch)

Note: The allowable tolerance for main bearing journals that are out of round is 0.010 mm (0.0004 inch). The maximum repair limit is 0.030 mm (0.0012 inch). If the repair limit is exceeded, regrind the bearing journals to the specified dimension.

Note: The maximum service limit for the crankshaft journal is 0.90 mm (0.035 inch). Replace the crankshaft if the crankshaft journal is worn beyond this specification.

Note: Replace the crankshaft if the runout exceeds the repair limit of 0.13 mm (0.005 inch).



Illustration 4g01412592

(A) Width of crankshaft main bearing journal ... 33.000 to 33.039 mm (1.2992 to 1.3007 inch)



Illustration 5g01412596

(3) Crankshaft end play ... 0.100 to 0.264 mm (0.0039 to 0.0104 inch)

Note: The maximum repair limit is 0.300 mm (0.0118 inch).

Replace the standard thrust plates if the end play exceeds the standard clearance. Three oversize thrust plates are available as replacements if the end play still exceeds the maximum limit. Generally, the rear journal is likely to be worn more rapidly than the front journal. If necessary, replace the rear thrust plate. Refer to Table 3 for oversize thrust plates.

Table 3
Dimensions for Grinding of Crankshaft
Oversize Thrust Plates 
Oversize Thrust Plate  Oversize (front or rear)  Oversize (front or rear)  Tolerance 
+0.15 mm (+0.006 inch)  33.15 mm (1.305 inch)  33.30 mm (1.311 inch)  +0.039 mm (+0.0015 inch) 
+0.30 mm (+0.012 inch)  33.30 mm (1.311 inch)  33.45 mm (1.317 inch)  +0.039 mm (+0.0015 inch) 
+0.45 mm (+0.018 inch)  33.45 mm (1.317 inch)  33.60 mm (1.323 inch)  +0.039 mm (+0.0015 inch) 

Refer to Specifications, "Crankshaft Pulley" for the applicable torque of the crankshaft pulley nut.

The maximum temperature for installing the crankshaft gear is the following value. ... 100 °C (212 °F)

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