CUMMINS 3903857 GENUINE VIBRATION DAMPER / FLYWHEEL MOUNTING BOLT – OEM FOR 1989–2002 5.9L CUMMINS

The Cummins 3903857 Genuine Vibration Damper / Flywheel Mounting Bolt is an OEM-grade fastener designed to securely attach either the harmonic balancer (vibration damper) or flywheel to the crankshaft of your 5.9L Cummins engine.

Using genuine Cummins bolts ensures the correct torque and clamping force, preventing loosening and reducing the risk of crankshaft or component damage.

Features & Benefits

• OEM Quality: Manufactured to Cummins specifications for strength and durability.
• Critical Clamping Force: Maintains secure mounting under extreme diesel torque loads.
• Dual Application: Fits both vibration damper and flywheel mounting points.

Fitment

• 1989–1993 Dodge Ram 2500/3500 5.9L Cummins (VE rotary pump)
• 1994–1998 Dodge Ram 2500/3500 5.9L Cummins (P7100 injection pump)
• 1998.5–2002 Dodge Ram 2500/3500 5.9L Cummins (VP44 injection pump)
• Also fits certain Cummins 6BT industrial engines – verify part number

Cross Reference Part Numbers

• Cummins 3903857
• Replaces: 3903910
• Interstate McBee M-3903857

Frequently Asked Questions

Can I reuse this bolt?

No. This is a torque-to-yield (TTY) bolt and should always be replaced when removed.

Is threadlocker required?

Yes. Cummins recommends using the specified threadlocker for secure installation.

Does this fit aftermarket dampers and flywheels?

Yes, provided they are designed for OEM-style mounting hardware.

Tags

cummins 3903857, vibration damper bolt cummins, flywheel mounting bolt 5.9 cummins, dodge ram crank damper bolt, OEM cummins flywheel bolt, diesel harmonic balancer bolt, 12-valve cummins flywheel bolt, VP44 cummins crank bolt, 5.9 cummins damper mounting hardware