Product Description
CUMMINS 3900267 OEM TAPPET COVER BOLT GROMMET SEAL – 5.9L (1989–1998)
The genuine CUMMINS 3900267 OEM tappet cover bolt grommet seal restores proper sealing around the tappet (valve) cover bolts on your 1989–1998 5.9L Cummins 12-valve engine. Over time, original rubber grommets harden, flatten, and crack—leading to persistent oil seepage and valve cover staining. This OE-correct Cummins grommet ensures the cover bolts clamp and seal properly, eliminating leaks and maintaining crankcase cleanliness.
Whether refreshing a high-mileage engine or resealing the tappet cover during pump, lifter, or camshaft service, Cummins 3900267 is the correct replacement part. For best results, pair this grommet with the matching CUMMINS 3900258 tappet cover gasket and other OE hardware to restore a leak-free seal on your 6B/6BT engine.
Key Features
- Genuine Cummins OEM grommet for tappet/valve cover bolt sealing.
- Prevents oil seepage caused by hard or deteriorated original rubber.
- Correct fitment for 1989–1998 5.9L Cummins 6B/6BT/12-valve engines.
- High-temperature rubber compound designed for long-term sealing performance.
- Ideal for full top-end reseal or routine maintenance.
Fitment Details
- Engine: 5.9L Cummins 6B / 6BT / 12-Valve
- Years: 1989–1998
- Applications: Dodge Ram 2500/3500 plus industrial/ag applications using the 6B/6BT platform
- Location: Seals the tappet/valve cover bolts to prevent crankcase oil leaks
Always verify fitment by VIN/ESN, especially for industrial or mixed-year engines.
Cross-Reference & Companion Cummins Parts
- CUMMINS 3900258 TAPPET COVER GASKET – 5.9L (1989–1998)
- CUMMINS 3900685 VALVE COVER GASKET – 5.9L CUMMINS
- VIEW ALL GENUINE CUMMINS PARTS
Common Cummins references: 3900267, 3900267-0, 3900267-A (verify before substituting).
Installation Notes
- Replace grommets whenever the tappet cover is removed.
- Inspect bolt sleeves and washers for corrosion or deformation.
- Torque bolts evenly to prevent gasket distortion.
- Combine with a new Cummins 3900258 gasket for a complete top-seal refresh.
Specifications for cummins 3900267
| Attribute | Value |
|---|---|
| Brand | Cummins (Genuine OEM) |
| Cummins Part Number | 3900267 |
| Function | Grommet seal for tappet/valve cover bolts |
| Engine Compatibility | 5.9L Cummins 6B / 6BT / 12-Valve (1989–1998) |
| UPC | 786102089831 |
| GTIN | 786102089831 |
| Shipping Weight | Approx. 0.02 lb |
| Shipping Method | Standard ground shipping |
| Cross Reference | 3900267-0, 3900267-A (verify via VIN/ESN) |
| E-Codes | Used on non-certified 6B/6BT engines (consult Cummins documentation) |
| Prop 65 Warning | WARNING: This product may expose you to chemicals including engine oil residues, known to cause cancer. Visit www.P65Warnings.ca.gov. |
| Country of Origin | As labeled by Cummins (varies by batch) |
Frequently Asked Questions
DOES THIS SEAL FIT ALL 1989–1998 5.9L 12-VALVE ENGINES?
Yes—3900267 is the correct Cummins grommet seal for tappet/valve cover bolts on all 1989–1998 5.9L 6B/6BT engines. Always verify by VIN/ESN for industrial models.
SHOULD I REPLACE THE GASKET AT THE SAME TIME?
Yes, Cummins recommends replacing the 3900258 tappet cover gasket whenever the cover is removed for service.
HOW MANY GROMMETS DO I NEED?
Most 6BT tappet/valve covers require multiple grommets—confirm your engine’s bolt count before ordering.
IS THIS AN OEM CUMMINS PART?
Yes—this is a genuine Cummins OEM grommet manufactured for proper sealing performance.
WHAT CAUSES THESE GROMMETS TO FAIL?
Age, heat cycles, and oil exposure harden the rubber over time, leading to flattening and leaks.
