A-3900919-AI Bolt; Connecting Rod
A-3900919-AI Bolt; Connecting Rod
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One New Aftermarket Replacement Connecting Rod Bolt for Cummins B-Series Diesel Engines
This connecting rod bolt (rod cap screw) is a critical engine fastener used to secure the connecting rod caps to the crankshaft journals in Cummins B-Series diesel engines. Replaces Cummins OEM part number 3900919. These are torque-to-yield fasteners designed for one-time use -- do not reuse removed rod bolts. A complete inline-six engine requires 12 bolts (2 per connecting rod); the 4-cylinder B-Series requires 8 bolts. Sold individually.
This bolt fits machined-rod configurations of the Cummins B-Series 3.9L and 5.9L engines. Always confirm the correct rod bolt by engine serial number (ESN) and existing hardware before ordering, as multiple rod and bolt combinations exist within the B-Series family.
Compatible Engines
Cummins B-Series: 4B 3.9L, 4BT 3.9L, 4BTA 3.9L, 6B 5.9L, 6BT 5.9L, 6BTA 5.9L, ISB 5.9L, QSB 5.9L
Dodge / Ram: 1989-2002 Ram 2500/3500 5.9L Cummins (12-valve and 24-valve)
Industrial / Agricultural / Off-Highway: Cummins B-Series powered equipment -- verify by engine serial number (ESN) before ordering.
Replaces Part Number(s):
3900919, A-3900919, A-3900919-AI
New aftermarket replacement part - not remanufactured, not used.
