Product Description
Interstate-McBee M-3936876 Rectangular Ring Seal – Oil Fill | 1989–1998 5.9L Cummins 12-Valve
Direct-replacement rectangular ring seal for the oil fill opening on 1989–1998 Dodge Ram 2500/3500 with the 5.9L Cummins 12-valve (6BT). Restores a proper seal to help prevent oil seepage and grime buildup around the oil fill. Sold individually.
- OE-equivalent fit: Matches Cummins reference 3936876 for factory-style sealing.
- Durable elastomer: Resistant to heat, oil, and under-hood contaminants.
- Simple service: Installs in minutes during routine maintenance.
- Value: Interstate-McBee quality at an economical price.
Specifications
| Brand | Interstate-McBee |
| Part Number | M-3936876 |
| OEM Reference | Cummins 3936876 |
| Function | Oil fill rectangular ring seal / gasket |
| Material | Oil-resistant elastomer |
| Sold As | Each (1 seal) |
| Typical Qty Required | 1 per engine (verify by ESN) |
What’s Included
- (1) Rectangular ring seal, P/N M-3936876
Vehicle Fitment
Always verify by engine serial number (ESN) when possible.
- Dodge Ram 2500/3500 5.9L Cummins (12-valve 6BT)
- Model Years: 1989–1998
- Additional B-Series applications (4B/6B) where Cummins 3936876 is specified (confirm by ESN).
Recommended/Related Parts
- Oil Fill Cap / Tube (search your ESN)
- Valve Cover Gasket Set – 12V
- Front Gear Housing Gasket / Seal Kit
- Crankcase Breather / Grommet
Install Notes
- Clean the sealing groove and mating surfaces thoroughly; remove old seal material and debris.
- Lightly oil the new seal to ease installation; avoid RTV or sealants unless specified by the service manual.
- Seat the seal evenly without twisting. Verify the oil fill cap/neck engages and seals properly.
- Always follow procedures and torque specs in the Cummins service manual.
Why Buy From CPP Diesel
- ESN-verified fitment support from diesel specialists
- Fast shipping, easy returns, competitive pricing
- Deep inventory of complementary B-series engine parts
FAQ
Will this fit my 1989–1998 5.9L Cummins?
Yes—this ring seal is for the 12-valve 5.9L Cummins used in 1989–1998 Dodge Ram 2500/3500, when Cummins 3936876 is specified. For edge cases, verify by ESN.
How many do I need?
One per engine. Inspect the oil fill cap/neck and replace if worn for best results.
Do I need sealant?
No sealant is typically required. Install dry or with a light film of clean engine oil unless your service manual instructs otherwise.
