Product Description
CUMMINS 4089173 OEM LOWER ENGINE GASKET KIT – RAM 5.9L (2003–2007)
The Cummins 4089173 OEM lower engine gasket kit is the factory-engineered solution for resealing the bottom end of your 2003–2007 Dodge Ram 2500/3500 with the 5.9L ISB common-rail engine. This genuine Cummins conversion set consolidates the critical oil pan, gear housing, oil cooler and lower-end sealing points into one box so you can refresh your short block with confidence instead of chasing individual gaskets and O-rings.
WHY CHOOSE GENUINE CUMMINS 4089173?
- OEM fit & materials: Built by Cummins to match the original 5.9L ISB common-rail sealing surfaces for long-term durability in diesel service.
- Complete lower-end coverage: Includes key lower-engine gaskets, seals, and washers needed when the oil pan and gear housing are off for overhaul or repair (contents vary by ESN).
- Fewer leaks, less comebacks: Correct thickness, profiles, and crush characteristics help prevent seepage that can happen with generic aftermarket kits.
- Ready for work or tuning: Ideal for stock rebuilds, towing builds, and performance common-rail 5.9L Cummins applications when you want OEM reliability.
- Stage 3B / off-highway compatibility: Common on Stage 3B ISB/QSB 5.9 applications and other industrial engines—verify by ESN before ordering.
FITMENT – 2003–2007 RAM 5.9L ISB (COMMON-RAIL)
This Cummins 4089173 lower engine gasket kit is engineered for the following automotive applications:
- 2003–2007 Dodge Ram 2500 – 5.9L ISB 24V common-rail diesel
- 2003–2007 Dodge Ram 3500 – 5.9L ISB 24V common-rail diesel
Engine platform: 5.9L ISB (24V common-rail)
Fuel system: High Pressure Common Rail (HPCR)
Industrial/off-highway: Also used on select Stage 3B ISB/QSB 5.9 engines. Always verify by engine serial number (ESN) before ordering for non-Ram applications.
Quantity required: 1 kit per engine.
CROSS-REFERENCE & RELATED CUMMINS PARTS
OEM/cross reference identifiers (ID only, not all stocked here):
- Cummins: 4089173 (lower engine gasket kit)
- Mopar reference (ID only): 5093229AA
- Aftermarket equivalents (ID only): Interstate-McBee M-4089173, various industrial cross references
For a complete engine reseal on your 5.9L ISB common-rail, pair this lower kit with these genuine Cummins parts on cppdiesel.com:
- CUMMINS 4089819 OEM UPPER ENGINE GASKET KIT – ISB 5.9L (2003–2007) – matching upper/top-end kit for 5.9L common-rail.
- CUMMINS 3802820 OEM FRONT CRANKSHAFT SEAL KIT W/ WEAR SLEEVE – 5.9L/6.7L – recommended front seal solution when the crank nose is grooved.
- CUMMINS 3937111 OEM FRONT CRANKSHAFT SEAL SERVICE KIT – 5.9L CUMMINS (1989–2007) – OE front crank seal service kit with installer.
- CUMMINS 3906698 OEM WATER PUMP RECTANGULAR RING SEAL – 5.9L/6.7L (1989–2018) – replaces the water pump/block rectangular seal while the front of the engine is apart.
- CUMMINS 3802376 OEM LOWER ENGINE GASKET SET – RAM 5.9L (1989–1998) – earlier 12-valve lower kit (for customers with mixed-year fleets).
Specifications for cummins 4089173
| Attribute | Value |
|---|---|
| Brand | Cummins (Genuine OEM) |
| Part Number | 4089173 – Lower Engine Gasket Kit (Conversion Set) |
| UPC | Not specified by manufacturer |
| GTIN | Not specified by manufacturer |
| Engine Platform | 5.9L ISB 24V common-rail (HPCR) – B-Series Cummins |
| Primary Automotive Fitment | 2003–2007 Dodge Ram 2500/3500 5.9L Cummins (ISB common-rail) |
| Industrial/Off-Highway | Common on Stage 3B ISB/QSB 5.9 engines; verify by ESN before ordering |
| Kit Contents (Overview) | Lower engine gaskets and seals for oil pan, gear cover/housing interfaces, oil cooler & filter head, selected coolant/oil passages, O-rings and sealing washers (exact contents vary by ESN; front/rear crank seals typically sold separately). |
| Shipping Weight | Approx. 2.5 lb (boxed kit) |
| Typical Package Dimensions | Approx. 26" L x 16" W x 2" H (flat gasket set carton) |
| Cross Reference (ID only) | Cummins 4089173; Mopar 5093229AA; aftermarket equivalents such as Interstate-McBee M-4089173 and Reliance K4089173 (ID only; contents may differ). |
| E-Codes / Emissions Notes | Supports on-road HPCR 5.9L ISB applications (U.S. light-duty diesel) and Stage 3B industrial engines where specified. Always match to ESN and emissions family. |
| Prop 65 Warning | WARNING: This product can expose you to chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, visit www.P65Warnings.ca.gov. |
| Country of Origin | As supplied by Cummins (varies by batch; typically OEM global supply chain) |
INSTALL TIPS
- Clean all block, gear housing, and oil pan sealing surfaces thoroughly; remove old RTV and gasket material.
- Dry-fit components to confirm alignment before applying sealant or torquing fasteners.
- Use only Cummins-approved RTV where specified in the service manual; do not over-apply.
- Always torque fasteners in the sequence and to the values specified in the Cummins service information.
FAQ
WILL THIS KIT FIT MY 2003–2007 5.9L CUMMINS RAM?Yes. Cummins 4089173 is the correct OEM lower engine gasket kit for most 2003–2007 Dodge Ram 2500/3500 trucks equipped with the 5.9L ISB 24-valve common-rail engine. Because Cummins used multiple configurations, we still recommend verifying by VIN or engine serial number (ESN) before ordering.
DOES THIS LOWER ENGINE GASKET KIT INCLUDE FRONT AND REAR MAIN SEALS?
Typically, no. The 4089173 kit focuses on oil pan, gear housing, oil cooler, and related lower gaskets and seals. Front and rear crankshaft seals are usually not included and should be ordered separately, such as: front crank seal/wear sleeve kit CUMMINS 3802820 or service kit CUMMINS 3937111, and the appropriate OEM rear main seal.
WHAT UPPER ENGINE GASKET KIT SHOULD I PAIR WITH 4089173?
For a complete reseal on a 2003–2007 5.9L ISB common-rail Ram, the typical companion kit is the CUMMINS 4089819 OEM UPPER ENGINE GASKET KIT – ISB 5.9L (2003–2007). That kit handles the cylinder head, valve cover, intake/exhaust manifold, injector cup and related top-end seals.
CAN I USE THIS KIT ON INDUSTRIAL OR STATIONARY 5.9L ENGINES?
In many cases, yes—4089173 is common on Stage 3B ISB/QSB 5.9 applications and other B-series engines using HPCR fuel systems. However, industrial engines can vary significantly by CPL and ESN, so always verify your engine serial number and consult Cummins documentation before ordering.
IS THIS GASKET KIT SUITABLE FOR PERFORMANCE OR HIGH-POWER BUILDS?
This is a genuine Cummins OEM gasket kit designed for factory-level durability in heavy-duty diesel use. For most towing, work-truck, and moderately tuned 5.9L common-rail combinations, it’s an excellent choice. Extremely high horsepower or competition builds may require additional fastener upgrades and build-specific sealing strategies, but many builders still prefer OEM gaskets for baseline reliability.
