Product Description
Genuine Cummins
Cummins 3804990 — Piston Ring Set (Standard Bore) for ISB 5.9L 24V
MPN: 3804990 | Also Known As: piston rings, ring kit | Cross-Refs: 3804947, PAI 505105, Mahle 28609N-STD, S41941
Why This Part
- ✓ OE-quality ring pack to restore compression, oil control, and blow-by performance.
- ✓ Standard bore (STD) ring set—ideal for stock rebuilds with in-spec cylinders.
- ✓ Single-cylinder kit—order 6 sets per engine for a complete rebuild.
- ✓ Compatible with ISB 5.9L 24V (VP44) pistons; see fitment & notes below.
OE Match STD Bore 1 Cylinder Set
Quick Specs
| Type | Single-cylinder piston ring set (STD) |
|---|---|
| OE Part # | 3804990 (alt: 3804947; ID x-refs: PAI 505105, Mahle 28609N-STD, S41941) |
| Qty Required | 6 sets for a full 6-cyl engine |
| Notes | Verify piston style and bore; oversizes sold separately. |
Verified Fitment (Automotive)
| Year Range | Engine | Chassis |
|---|---|---|
| 1998.5–2002 | Ram 5.9L ISB 24V (VP44) | Ram 2500/3500 |
Industrial/Off-Highway: Seen on select ISB/QSB 5.9 applications (e.g., Stage 3B/QSB variants)—verify by ESN and piston PN before ordering.
Often Paired With
- Piston Kits (per-cylinder): match piston style to ring pack and bore
- Head Gasket Set: replace during top-end service
- Flex-Hone/finish tools: de-glaze cylinders; verify cross-hatch & surface finish
- Engine oil & filter: change after first heat cycle
What’s In The Box
- (1) Standard-bore piston ring set for one cylinder (Cummins 3804990)
- Order 6 for a complete engine set. Pistons, bearings, and gaskets sold separately.
Install Tips
- Measure bore & taper; confirm STD works or choose correct oversize.
- File-fit top/second ring end gaps to spec; check in multiple positions.
- Observe ring orientation marks; stagger gaps per service manual.
- De-glaze cylinder for proper seating; lubricate with clean engine oil.
FAQ
IS THIS A SINGLE-CYLINDER RING SET OR A FULL ENGINE SET?This is a single-cylinder STD-bore ring set. Order 6 sets for a complete engine.
WHAT YEARS/TRUCKS DOES 3804990 FIT?Primarily 1998.5–2002 Ram 2500/3500 with 5.9L ISB 24V (VP44). Always verify by VIN/ESN and piston part number.
HOW DO I KNOW IF I NEED OVERSIZE RINGS?If cylinder wear exceeds spec or after a rebore, use the matching oversize. Measure bore and follow Cummins specs.
IS THIS A GENUINE CUMMINS PART?Yes—Cummins 3804990 with OE ring materials and profiles for proper sealing.
CAN I USE THIS ON INDUSTRIAL ISB/QSB ENGINES?Often yes, but industrial engines vary. Confirm by engine serial number (ESN) and piston PN before ordering.
