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Cat Man
Cat Man, Caterpillar Engine Expert
Category: Heavy Equipment
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Experience:  23 Years Caterpillar Engine experience.
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I am looking for main and rod bearing boly tork specs..bearings

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I am looking for main and rod bearing boly tork specs. Also looking for clearances for those bearings and end play. It is a cat c15 bxs37867

Hi. Thanks for using JA! I can help you with this.

 

The Rods are:

 


a. Tighten Bolt (A) and Bolt (C) to a torque of 70 ± 4 N·m (52 ± 3 lb ft).
b. Tighten Bolt (B) and Bolt (D) to a torque of 70 ± 4 N·m (52 ± 3 lb ft).
c. Turn Bolt (B) and Bolt (D) for an additional 60 ± 5 degrees (1/6 turn).
Note: If Tooling (C) is not used, place an index mark on each bolt.
d. Tighten Bolt (A) and Bolt (C) to a torque of 70 ± 4 N·m (52 ± 3 lb ft).
e. Turn Bolt (A) and Bolt (C) for an additional 60 ± 5 degrees (1/6 turn).

 

 

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The Mains are:

 

Tighten bolts (1) for the main bearing caps, as follows:
a. Tighten Bolt (A) to a torque of 258 ± 14 N·m (190 ± 10 lb ft).
Note: Bolt (A) is on the bearing tab side of the main bearing cap.
b. Tighten Bolt (B) to a torque of 258 ± 14 N·m (190 ± 10 lb ft).
Note: Bolt (B) is on the opposite side of the bearing tab of the main bearing cap.
c. Tighten Bolt (B) for an additional 120 ± 5 degrees (2 flats).
Note: If Tooling (C) is not used, place an index mark on the bolt and the main bearing cap.
d. Tighten Bolt (A) for an additional 120 ± 5 degrees (2 flats).
Note: If Tooling (C) is not used, place an index mark on the bolt and the main bearing cap.
e. Rotate the crankshaft in order to ensure that the crankshaft turns freely.

 

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I'm sorry. I forgot to add the end play and bearing clearances.

 

CRANKSHAFT ENDPLAY

End play of the crankshaft ... 0.11 to 0.57 mm (0.004 to 0.022 inch)


ROD CLEARANCE

Clearance between the new bearing and the journal ... 0.062 mm to 0.160 mm (0.0024 inch to 0.0063 inch)
Maximum permissible clearance between the bearing and the journal ... 0.20 mm (0.008 inch)
MAIN BEARING CLEARANCE

Main bearing cap with two bolts
Clearance between new bearing and new journal ... 0.076 to 0.186 mm (0.0030 to 0.0073 inch)
Main bearing cap with four bolts
Clearance between new bearing and new journal ... 0.071 to 0.178 mm (0.0028 to 0.0070 inch)

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Customer: replied 6 years ago.

do you have the max for end play and main bearings. I am just checking wear on the bearings so nee to know max. Thank you

The max for the endplay would be 0.022

 

The max for the Main bearing clearance would be 0.0073

 

Please let me know if you need anything else.

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