INTERSTATE MCBEE
INTERSTATE-MCBEE M-3921640 VALVE STEM SEAL 89–98 5.9L CUMMINS (AFTERMARKET REPLACEMENT)
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- SKU:
- MCBM-3921640
- MPN:
- M-3921640
- Shipping:
- Calculated at Checkout
Description
Interstate-McBee M-3921640 Valve Stem Seal – 89–98 5.9L Cummins 12V
OE-style valve stem seal for 1989–1998 5.9L Cummins 12-valve (6BT) engines. Built to OEM dimensions to control oil past the valve guide, stabilize idle quality, and minimize oil consumption. Sold individually; 12 seals required per 12-valve engine.
- Direct OEM cross: Replaces Cummins 3921640 (Interstate-McBee M-3921640).
- Intake or exhaust: One part number services both valve locations for simple stocking.
- High-temp elastomer & precise lip geometry: Reliable sealing for daily, tow, or work use.
- Aftermarket value: OEM-equivalent function at a fraction of genuine OEM pricing.
Specifications
| Interstate-McBee Part | M-3921640 |
|---|---|
| OEM Reference | Cummins 3921640 |
| Interchange | 3901097, 3921639 |
| Position | Intake or Exhaust |
| Sold As | Each (12 required per 12-valve engine) |
| Engine Family | Cummins B-Series (focus: 5.9L 12V 6BT) |
Vehicle Fitment
Always verify by Engine Serial Number (ESN) for edge-case builds.
- Dodge/Ram 5.9L Cummins 12-Valve (6BT)
- 1989–1993: D/W 250 & 350
- 1994–1998: Ram 2500 & Ram 3500
- Notes: Common on 4BT/6BT B-Series industrial variants; ESN verification recommended.
Installation Notes
- Use a proper valve spring compressor; protect seal lips during installation.
- Lightly oil the valve stem; ensure clean guide surfaces.
- Follow the Cummins service manual for procedures and specs.
Warranty
Interstate-McBee new engine parts carry manufacturer warranty coverage. Contact us for coverage details on valve-train items.
Why Buy From CPP Diesel
- ESN-verified fitment support from diesel specialists.
- Fast shipping and hassle-free returns.
- Deep B-Series catalog for one-stop parts sourcing.
FAQ
How many seals do I need for a 12-valve 5.9L Cummins?12 total (one per valve). This part is sold individually.
Does M-3921640 work on intake and exhaust valves?
Yes—this seal services either intake or exhaust positions on 12-valve heads.
Will this fit 24-valve engines?
This listing targets 1989–1998 12-valve engines. Later 24-valve models often use different seals (e.g., 3955393 for many 2003–2018 applications). Always confirm by ESN.
Is this an OEM Cummins part?
No—this is an Interstate-McBee aftermarket replacement that cross-references OEM Cummins 3921640.
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