3901090 Main Bearing Cummins 6BT 12v 4BT 8v
3901090 Standard Size Main Bearing 390 109 0 St

New Main Bearing with oil cutout for Cummins 12v 6BT 5.9 and 8v 4BT 3.9. This is the upper crankshaft bearing.

Standard Size.

                       
            
       



Scroll down for more detailed compatibility information.

Part Number: 3901090 3978818

Weight: 0.1 lbs.

Price: $3.00
Short Product Description:

3901090 Standard Size Main Bearing

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Questions and Answers:

Q: What is the main bearing bore Inner Diameter (ID) for Cummins C-Series engines without bearings? 9/18/2024
A: The Cummins Repair Manual says that the ID should be 104.982 mm min and 105.018 mm max. It must not be out of roound by more than .05mm.

Q: What is the main bearing bore inner diameter (ID) for Cummins B-Series engines without bearings?
9/18/2024
A: The Cummins Repair Manual says that the ID should be 87.982 mm min and 88.018 mm max. It must not be out of roound by more than .05mm.

Q: What is the Crankshaft bearing journal Diameter for Cummins C-Series engines?
9/25/2024
A: The Cummins Repair Manual says that the minimum OD should be 97.962 mm for Standard. 97.712mm for .25mm ground. 97.462mm for .50mm ground. 97.212mm for .75mm ground. 96.962mm for 1.00mm ground.

Q: What is the Crankshaft bearing journal Diameter for Cummins B-Series engines?
9/25/2024
A: The Cummins Repair Manual says that the minimum OD should be 82.962 mm for Standard. 82.712mm for .25mm ground. 82.462mm for .50mm ground. 82.212mm for .75mm ground. 81.962mm for 1.00mm ground.



3901090 Main Bearing Quantity: 6 Remarks: NOTE: Replaces (3905619) Engine Year: 1988 BT5.9 160 CPL:804 Sample ESN: 44243058

3901090 Main Bearing Quantity: 6 Remarks: NOTE: Replaces (3905619) Engine Year: 1988 BT5.9 160 CPL:804 Sample ESN: 44243058

3901090 Main Bearing Quantity: 4 Remarks: M6 x 8.0 Engine Year: 1988 4BT3.9 (105) CPL:858 Sample ESN: 44258612

3901090 Main Bearing Quantity: 4 Remarks: M6 x 8.0 Engine Year: 1988 4B3.9 CPL:591 Sample ESN: 21021339

3901090 Main Bearing Quantity: 4 Remarks: M6 x 8.0 Engine Year: 1995 4BT3.9-C CPL:730 Sample ESN: 21021339

3901090 Main Bearing Quantity: 6 Remarks: NOTE: Replaces (3905619) Engine Year: 1996 B5.9-C177 CPL:599 Sample ESN: 46114812

3978818 Main Bearing Quantity: 6 Remarks: Same As 3929016. Engine Year: 1999 BT5.9-C160 CPL:1288 Sample ESN: 46114812

Description: 3901090 Standard Size Main Bearing
Price: $3.00

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