Product Description
Interstate-McBee M-5259499 Rear Oil Seal – 1989–2018 5.9L/6.7L Cummins (Aftermarket)
Stop bellhousing oil leaks with this OEM-style rear crankshaft main oil seal from Interstate-McBee. The M-5259499 is a direct-fit aftermarket replacement for Cummins applications in 1989–2018 Dodge/Ram 2500/3500 trucks equipped with 5.9L or 6.7L Cummins engines.
- Direct-fit replacement: Matches OE dimensions for reliable sealing at the rear main.
- For good crank surfaces: Non-sleeved design intended for non-damaged crank flanges.
- Installer ring: Supplied with a cardboard inner ring for installation alignment.
- Aftermarket value: Interstate-McBee quality at an aggressive price point.
Specifications
| Interstate-McBee Part # | M-5259499 |
|---|---|
| OEM Reference | Cummins 5259499 (rear main / rear oil seal) |
| Design | Non-sleeved; with cardboard inner ring |
| Quantity | 1 per engine |
| Position | Rear main (crankshaft) oil seal |
Vehicle Fitment
Always verify by VIN/ESN and crank surface condition.
- Dodge/Ram 2500 & 3500 – 5.9L Cummins (1989–2007)
- Ram 2500 & 3500 – 6.7L Cummins (2007.5–2018)
What’s Included
- (1) Rear main (rear oil) seal – M-5259499
- Note: Cover gasket, installation tool, and repair sleeve are not included.
Recommended Add-Ons
- Rear main cover gasket (’89–’02): Cummins 4947667
- Rear main cover gasket (’03–’18): Cummins 5443388
- Installer tool: CTA 3880 (or equivalent)
Install Tips
- Inspect crank flange for grooves; if worn, use a repair-sleeve style seal instead.
- Set to the proper depth using an appropriate installer; do not drive flush unless specified by OE procedure.
- Degrease mating surfaces and verify no leaks from cam plug or rear cover gasket before reassembly.
Why Buy From CPP Diesel
- ESN-verified fitment support from real diesel techs
- Fast shipping & easy returns
- Curated Cummins parts with cross-links to the gaskets, tools, and hardware you’ll actually need
FAQ
Will M-5259499 fit both 5.9L and 6.7L Cummins?Yes. Coverage spans 1989–2018 Dodge/Ram 2500/3500 with 5.9L or 6.7L Cummins (verify by VIN/ESN).
Does this include a repair sleeve or tool?
No. This is the non-sleeved seal and does not include an installation tool. Use the CTA 3880 (or similar) and choose a sleeve-type seal if your crank surface is grooved.
What gasket should I pair with it?
Typically 4947667 for 1989–2002 and 5443388 for 2003–2018 applications. Always confirm by VIN/ESN.
Is the inner ring steel?
No. This design uses a cardboard inner ring to aid installation.
Product Videos
Custom Field
YEAR 1989-2018
MAKE DODGE
ENGINE 5.9L,6.7L
