Product Description
Interstate-McBee M-4932377 Rod Bearing – .030" Undersize – 1989–2002 5.9L Cummins
High-quality replacement connecting rod bearing set for the 5.9L Cummins B-Series (1989–2002). This size is .030" undersize (also called 0.75 mm under) for use with a crankshaft that has been ground 0.030" under on the rod journals. Built to OE form, fit, and function for long service life.
- Correct undersize: .030" under for reconditioned crank journals.
- Precision fit: Manufactured to OE-equivalent specs for proper oil clearance.
- Durable construction: Quality materials and coatings for reliable load handling.
- Application matched: For B-Series 5.9L engines where Cummins ref. 4932377 applies.
Specifications
| Brand | Interstate-McBee |
| Part Number | M-4932377 |
| Size | .030" undersize (0.75 mm under) – rod journal |
| Engine | 5.9L Cummins B-Series (12-valve & 24-valve) |
| Model Years | 1989–2002 (Dodge Ram 2500/3500 and other B-Series applications) |
| Location | Connecting rod journal bearing |
| Sold As | Set for one connecting rod (upper & lower shells) |
| Qty Required (I-6) | 6 rod bearing sets per engine |
What’s Included
- (1) Rod bearing set for a single connecting rod: upper & lower shells (.030" under)
Vehicle Fitment
Always verify by engine serial number (ESN) and journal size during teardown.
- 5.9L Cummins 12-Valve (1989–1998, 6BT)
- 5.9L Cummins 24-Valve (1998.5–2002, ISB)
- Other B-Series applications where Cummins ref. 4932377 is specified
Choosing the Correct Size
- Standard vs. undersize: Use .030" undersize bearings only if the crank rod journals have been machined 0.030" under nominal.
- Measure don’t guess: Confirm journal diameter and out-of-round after machining; check oil clearance during assembly.
- Match all six: All six rod journals should use the same size unless instructed otherwise by your machinist.
Install Notes
- Cleanliness is critical—keep journals, caps, and shells lint-free.
- Install bearing shells dry in their bores; oil only the running surface at assembly.
- Align bearing tangs; ensure shells are fully seated before torquing.
- Torque rod bolts to factory spec and verify oil clearance with plastigauge or mic/ID gauge.
- After assembly, verify crank endplay and free rotation.
Recommended/Related Parts
- Main bearing set (match standard/undersize to the machined main journals)
- Rod bolt/nut set (replace torque-to-yield hardware as required)
- Assembly lube and engine gasket set
- Standard and .010"/.020" undersize rod bearing options (if your crank is machined to those sizes)
Why Buy From CPP Diesel
- Diesel-specialist support to help you choose the correct bearing size
- Fast shipping and hassle-free returns
- Deep inventory of complementary Cummins rebuild parts
FAQ
What does “.030" undersize” mean?
It means the crankshaft rod journals were ground 0.030" smaller than standard. The bearing’s inner diameter is sized to restore proper oil clearance on a .030" under journal.
How many sets do I need?
The 5.9L inline-6 uses six connecting rods, so you need six rod bearing sets for a full engine.
Will this fit both 12-valve and 24-valve 5.9L?
Yes, this listing covers 1989–2002 B-Series 5.9L applications where part ref. 4932377 applies. Always confirm by ESN and journal size.
Can I mix sizes across cylinders?
Use the size required by each journal after machining. In practice, most shops machine all six rod journals the same size to keep parts consistent.
