Product Description
Genuine Cummins
Cummins 4955366 — Standard Piston Ring Set (Per Cylinder) for ISB 6.7L
MPN: 4955366 | Also Known As: piston ring set, ring kit, standard bore rings | Sold: Per cylinder (order 6 sets per engine)
Why This Part
- ✓ OE ring pack for factory sealing, oil control, and durability.
- ✓ Standard bore set for stock pistons (no oversize machining required).
- ✓ Per-cylinder kit—precisely matched rings for one piston (six kits complete an engine).
- ✓ Built to Cummins spec for consistent end-gap and material quality.
OE Fit Std Bore 6 Sets / Engine
Quick Specs
| Type | Piston ring set (standard bore) |
|---|---|
| OE Part # | 4955366 |
| Sold As | Per cylinder (order 6 for a full engine) |
| Application | ISB 6.7L (automotive), plus ISB/QSB 6.7 industrial variants (verify by ESN) |
| Cross-References | Interstate-McBee M-4955366; 505160 (for identification) |
Verified Fitment (Automotive)
| Year Range | Engine | Chassis |
|---|---|---|
| 2007.5–2015 | Ram 6.7L ISB (24V Common-Rail) | Ram 2500/3500 |
Industrial/Off-Highway: Common on EPA07 ISB/QSB 6.7 engines; always confirm by ESN and piston/ring spec.
Often Paired With
- Piston assemblies (standard bore)
- Upper engine gasket set / head gasket
- Rod & main bearings
- Hone/deglaze tools and a quality ring compressor
- Fresh oil & filter after initial run-in
What’s In The Box
- (1) Genuine Cummins Standard Piston Ring Set (4955366) — one cylinder
- Order quantity 6 for a complete engine set
Install Tips
- Measure cylinder bore; verify end-gap and side clearance to spec.
- Check ring orientation and stagger end gaps per Cummins procedure.
- Hone cylinders appropriately for ring material; clean bores until lint-free.
- Oil rings lightly; use proper compressor; verify piston direction.
FAQ
WILL THIS FIT MY 6.7L CUMMINS RAM?Yes—this standard-bore ring set is listed for 2007.5–2015 Ram 6.7L ISB applications (verify by VIN/ESN and piston spec).
HOW MANY SETS DO I NEED?It’s sold per cylinder. You’ll need 6 sets for one complete 6.7L engine.
IS THIS STANDARD OR OVERSIZE?Standard bore. If your block was overbored, choose the matching oversize rings instead.
IS THIS A GENUINE CUMMINS PART?Yes—OE Cummins 4955366 ring set.
DOES THIS FIT INDUSTRIAL ISB/QSB 6.7?Common on EPA07 ISB/QSB 6.7 industrial engines; confirm by ESN before ordering.
