Product Description
The CUMMINS 4089670 OEM ENGINE PISTON KIT (.020 OVER) is designed for 2004.5–2007 5.9L Cummins common-rail diesel engines. This genuine Cummins oversized piston kit is engineered for engine rebuilds requiring a .020-inch overbore and helps restore proper compression, performance, and durability.
Use this piston kit when rebuilding a worn engine block, repairing cylinder wall damage, or performing a complete engine overhaul. Always verify fitment by engine serial number and confirm cylinder bore measurements before ordering.
FEATURES
- Genuine Cummins OEM piston kit
- .020-inch oversized piston design
- Designed for 2004.5–2007 5.9L Cummins common-rail engines
- Helps restore compression and engine performance
- Ideal for engine rebuild and overhaul applications
- Manufactured to Cummins OE specifications
FITMENT
- 2004.5–2007 Dodge Ram 2500 5.9L Cummins
- 2004.5–2007 Dodge Ram 3500 5.9L Cummins
- 5.9L ISB Common-Rail Cummins Engines
WHAT'S INCLUDED
- 1 Cummins 4089670 OEM Engine Piston Kit (.020 Over)
- Piston
- Piston Pin
- Piston Rings
- Retaining Clips (where applicable)
CROSS-REFERENCE AND RELATED PRODUCTS
- Cummins 4089670
- Standard bore Cummins piston kits
- Cummins piston ring service components
SPECIFICATIONS
- Manufacturer: Cummins
- Part Number: 4089670
- Part Type: Engine Piston Kit
- Piston Size: .020 Over
- Engine Compatibility: 5.9L Cummins ISB Common Rail
- Fitment Years: 2004.5–2007
- Vehicle Application: Dodge Ram 2500 / 3500
- Condition: New
- Quantity: Sold Individually
FAQ
Will this part fit my truck?
This piston kit is designed for 2004.5–2007 5.9L Cummins common-rail applications. Always verify your engine serial number and bore size before ordering.
What does .020 over mean?
A .020 over piston is designed for an engine block that has been machined 0.020 inches larger than the factory bore size during rebuilding.
What is included in the piston kit?
This kit typically includes the piston, wrist pin, piston rings, and retaining hardware required for installation.
Can I use this piston in a standard bore cylinder?
No. This piston is intended only for engines machined to a .020-inch oversized bore specification.
Do I need any related parts?
Inspect connecting rods, rod bearings, cylinder liners, piston cooling nozzles, and related engine components during rebuild work and replace worn parts as necessary.
