Product Description
Interstate-McBee M-4932377 Connecting Rod Bearing – .030 Undersize (-0.75 mm) for 89–02 5.9L Cummins
Heavy-duty .030 undersize (-0.75 mm) connecting rod bearing engineered by Interstate-McBee for 1989–2002 5.9L Cummins B-Series (12V & 24V ISB). Built to OEM-equivalent dimensions for reliable oil film, proper crush, and long-term durability in performance rebuilds or factory-spec overhauls.
- OEM-equivalent fit: Matches Cummins reference 4932377 for B/ISB applications.
- Precise undersize: Corrects journals ground .030" under (-0.75 mm) to restore clearance.
- Aftermarket value: Interstate-McBee quality at a lower cost than OEM boxed parts.
- Built for 5.9L: Proven on 1989–2002 12-valve & early 24-valve ISB platforms when ESN verifies usage.
Specifications
| Manufacturer | Interstate-McBee |
|---|---|
| Part Number | M-4932377 |
| OEM Reference | Cummins 4932377 |
| Size | .030" undersize (-0.75 mm) |
| Engine Family | Cummins B / ISB (5.9L) |
| Material | Tri-metal bearing alloy (OEM-style) |
| Position | Connecting rod journal |
What’s Included
- (1) Connecting rod bearing, .030" undersize (-0.75 mm).
Quantity notes: A complete 6-cyl engine service typically uses 6 pairs of rod bearings (12 shells). Packaging varies by supplier; confirm quantity per “set” before checkout.
Vehicle Fitment
Always verify by engine serial number (ESN) and journal size after machining.
- Dodge Ram 2500/3500 — 5.9L Cummins:
- 1989–1993 12-Valve 6BT
- 1994–1998 12-Valve 6BT
- 1998.5–2002 24-Valve ISB
Install Notes
- Measure crank pin journals after machining; target oil clearance per Cummins service manual.
- Cleanliness is critical—debris will rapidly damage new bearings.
- Observe bearing tang orientation and cap torque/angle specs from Cummins procedures.
Why Buy From CPP Diesel
- ESN-verified fitment help from real diesel techs
- Fast shipping & easy returns
- Deep 5.9L B-Series inventory for one-stop rebuilds
FAQ
What does “.030 undersize (-0.75 mm)” mean?It matches a crankshaft rod journal that’s been ground .030" smaller than standard. These bearings add back the lost thickness to restore proper oil clearance.
Will this fit both 12-valve and 24-valve 5.9L?
Yes, when ESN confirms B/ISB usage and the crank was machined to .030" under. This covers most 1989–2002 B-Series 5.9L applications.
Is this sold as a half, pair, or full set?
This listing is for one bearing at .030" under. A full engine typically requires 12 shells (6 pairs). Some suppliers sell individual shells while others sell sets; verify packaging before purchase.
Do I need to machine the crank to use this bearing?
Yes—use .030" undersize bearings only if the rod journals have been ground .030" under standard diameter. Always plastigage/measure to confirm clearance.
Upper vs. lower shells—does M-4932377 designate one side?
Many catalogs refer to .030" / 0.75 mm as an individual shell (often lower). If you need a matched pair or a complete set for all six cylinders, confirm the kit contents or complementary part numbers before ordering.
