Product Description
The CUMMINS 4947667 OEM REAR MAIN SEAL COVER GASKET is a genuine Cummins sealing gasket designed for 1989-2002 Dodge Ram 5.9L Cummins diesel engines. This gasket seals the rear main seal housing (rear cover) to the engine block to help prevent oil leaks and maintain proper crankcase sealing.
Rear main cover leaks are common on high-mileage 5.9L Cummins engines, especially during rear main seal service, clutch replacement, transmission removal, or engine rebuilds. Replacing the rear cover gasket with a genuine Cummins OEM component helps ensure proper fitment, sealing integrity, and long-term durability under heat and oil exposure.
Cummins 4947667 is commonly used on BS3 5.9L B-Series 6BT and ISB engines found in Dodge Ram trucks as well as industrial applications. Cummins cross-reference numbers include 3928493, 3914386, 3938159, J938159, J914386, and J928493.
FEATURES
- Genuine Cummins OEM rear main seal cover gasket
- Fits 1989-2002 5.9L Cummins engines
- Seals rear main seal housing to engine block
- Helps prevent rear engine oil leaks
- OEM-quality gasket material and sealing profile
- Ideal for rear main seal service and engine rebuilds
- Designed for long-term heat and oil resistance
- Direct-fit OEM replacement design
FITMENT
- 1989-1993 Dodge Ram D250/D350/W250/W350 5.9L Cummins 12V
- 1994-1998 Dodge Ram 2500/3500 5.9L Cummins 12V
- 1998.5-2002 Dodge Ram 2500/3500 5.9L Cummins 24V ISB
- Fits BS3 5.9L B-Series 6BT and ISB engines
Fitment Note: Does not fit 2003-2007 5.9L Common Rail or 2007.5+ 6.7L Cummins engines. Verify fitment by VIN or ESN for industrial applications.
WHAT'S INCLUDED
- 1 Genuine Cummins 4947667 rear main seal cover gasket
CROSS-REFERENCE & RELATED PRODUCTS
- CUMMINS 5259499 OEM REAR MAIN CRANKSHAFT SEAL
- CUMMINS 3938156 OEM TIMING GEAR HOUSING GASKET
- CUMMINS 3284623 OEM TAPPET / PUSH ROD COVER GASKET
- CTA TOOLS 3880 REAR CRANKSHAFT SEAL TOOL
- CUMMINS OEM GASKETS & SEALS
WHY REPLACE THE REAR MAIN COVER GASKET?
Over time, heat cycles, crankcase pressure, and oil exposure can cause the rear cover gasket to harden or leak. Replacing the gasket during rear main seal service helps prevent oil leaks that can contaminate the clutch, flexplate, bellhousing, and transmission area while improving long-term engine sealing reliability.
SPECIFICATIONS
| Specification | Details |
|---|---|
| Manufacturer | Cummins |
| Part Number | 4947667 |
| Product Type | Rear main seal cover gasket |
| Engine Compatibility | 5.9L Cummins 6BT / ISB |
| Fitment Years | 1989-2002 |
| Cross Reference | 3928493, 3914386, 3938159, J938159, J914386, J928493 |
| Engine Family | BS3 B-Series |
| Material | OEM composite gasket material |
| Quantity Per Engine | 1 |
| Prop 65 | Warning: Cancer and Reproductive Harm — www.P65Warnings.ca.gov. |
FAQ
What does Cummins 4947667 seal?
Cummins 4947667 seals the rear main seal housing (rear cover) to the engine block to help prevent rear engine oil leaks.
Will this fit all 5.9L Cummins engines?
This gasket fits 1989-2002 5.9L Cummins 6BT and ISB engines but does not fit 2003+ Common Rail or 6.7L applications.
Should the rear main seal also be replaced during service?
Yes. It is strongly recommended to replace the rear main crankshaft seal anytime the rear cover is removed for service.
Is RTV required with this gasket?
Most applications install this gasket dry, though Cummins service procedures may recommend small sealant dabs at housing seams. Always follow factory service manual procedures.
