Product Description
Interstate-McBee M-3802423 Piston Ring Set – .040" Over | 1989–2002 5.9L Cummins (Aftermarket Replacement)
Quality aftermarket piston ring set sized .040" over (approx. +1.0 mm) for the 5.9L Cummins B-Series. Built for reliable sealing, oil control, and long service life in stock or mild-performance rebuilds. Sold as one cylinder set (rings for a single piston).
- Correct oversize: .040" over for cylinders bored/honed to the matching service size.
- Consistent sealing: Compression and oil rings designed for OE-style performance and durability.
- Drop-in with proper machine work: Pair with a precise bore/hone and verify end gaps per the Cummins manual.
- Interstate-McBee value: Trusted parts for professional engine rebuilders and DIY diesel enthusiasts.
Specifications
| Brand | Interstate-McBee |
| Part Number | M-3802423 |
| OEM Reference | Cummins 3802423 |
| Oversize | .040" over (≈ +1.0 mm) |
| Engine | 5.9L Cummins B-Series (12-valve & 24-valve as specified by ESN) |
| Model Years | 1989–2002 (verify exact fit by ESN) |
| Sold As | 1 cylinder set (rings for one piston) |
| Full Engine Qty | Order 6 sets for a complete 6-cyl engine |
What’s Included
- (1) Piston ring set for a single piston (compression rings + oil control ring assembly)
Vehicle Fitment
Always confirm by engine serial number (ESN) and current machine work.
- Dodge Ram 2500/3500 with 5.9L Cummins
- 12-Valve: 1989–1998 (6BT)
- 24-Valve: 1998.5–2002 (ISB)
- Other B-Series applications using Cummins 3802423 ring specification
Install Notes
- Confirm bore size after machining and clean cylinders thoroughly before installation.
- Measure and set ring end gaps to spec; file-fit if required.
- Observe ring orientation and stagger ring gaps according to the service manual.
- Use proper ring compressor and adequate lubrication during assembly.
FAQ
What does “.040" over” mean?
It indicates the rings fit a cylinder that’s been bored approximately 0.040" (≈1.0 mm) larger than stock. Match the rings to your finished bore size.
How many sets do I need?
One set services one piston. For a complete 6-cylinder engine, order 6 sets.
Will this fit both 12-valve and 24-valve 5.9L Cummins?
Yes in many cases, but variations exist. Verify by engine serial number (ESN) and your piston/ring spec before ordering.
