Product Description
The CUMMINS 4089671 OEM ENGINE PISTON KIT (.040 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 0.040-inch oversize piston after cylinder boring and machining.
Use this piston kit when rebuilding a worn or damaged 5.9L Cummins engine where cylinder bores have been machined .040-inch oversize. Always verify engine specifications, machining dimensions, and part numbers before ordering.
FEATURES
- Genuine Cummins OEM piston kit
- .040-inch oversize piston design
- Designed for 2004.5–2007 5.9L Cummins common-rail engines
- Ideal for engine rebuild and overhaul applications
- Helps restore compression and engine performance
- Manufactured to Cummins OE specifications
FITMENT
- 2004.5–2007 Dodge Ram 2500 5.9L Cummins
- 2004.5–2007 Dodge Ram 3500 5.9L Cummins
- Select Cummins ISB 5.9L industrial applications
Fitment Note: This is a .040-inch oversize piston kit and should only be used in engines machined to the proper bore specifications.
WHAT'S INCLUDED
- 1 Cummins 4089671 OEM Engine Piston Kit (.040 Over)
- Piston
- Piston pin
- Retaining clips and associated piston hardware as supplied by Cummins
CROSS-REFERENCE AND RELATED PRODUCTS
- Cummins 4089671
- OEM piston ring sets
- Cylinder liner and engine overhaul components
SPECIFICATIONS
- Manufacturer: Cummins
- Part Number: 4089671
- Part Type: Engine Piston Kit
- Piston Size: .040 Inch Oversize
- Engine Compatibility: 5.9L Cummins 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 fits 2004.5–2007 5.9L Cummins applications listed above. Always verify your engine build requirements and machining dimensions before ordering.
What does .040 over mean?
.040 over indicates the piston is designed for an engine block that has been bored 0.040 inches larger than the factory cylinder diameter during rebuilding.
What is included?
This listing includes one Cummins 4089671 piston kit with the components supplied by Cummins for piston installation.
Can this piston be used in a standard bore engine?
No. This piston is specifically designed for engines machined to .040-inch oversize cylinder dimensions.
Is this a genuine Cummins part?
Yes. Cummins 4089671 is a genuine OEM Cummins engine piston kit.
Do I need any related parts?
During an engine rebuild, inspect piston rings, connecting rods, bearings, cylinder bores, liners, gaskets, seals, and related engine components and replace as necessary.
