Product Description
Interstate-McBee M-3818824 Exhaust Manifold Nut – 1989–2018 5.9L / 6.7L Cummins
Quality aftermarket replacement exhaust manifold nut for Cummins B-Series engines. Designed for OE-equivalent fit and clamping force to secure the exhaust manifold to the cylinder head. Sold individually.
- OE-style replacement: Matches factory dimensions for reliable fitment.
- Durable construction: Heat-resistant materials for high-temperature turbo-diesel environments.
- Service-friendly: Ideal for manifold swaps, leak repairs, or hardware refreshes.
Specifications
| Brand | Interstate-McBee |
| Part Number | M-3818824 |
| Component | Exhaust manifold nut (hardware) |
| Sold As | Each (1 nut) |
| Typical Quantity Required | 12 per engine (one per exhaust manifold stud) |
Vehicle / Engine Fitment
Always verify by engine serial number (ESN) when possible.
- Cummins 5.9L 12-Valve (1989–1998)
- Cummins 5.9L 24-Valve ISB (1998.5–2007)
- Cummins 6.7L ISB (2007.5–2018)
What’s Included
- (1) Exhaust manifold nut, P/N M-3818824
Recommended/Related Parts
- Exhaust manifold studs (replace as needed)
- Exhaust manifold gasket set
- Turbo outlet gasket / hardware (if removing turbocharger)
- Anti-seize compound rated for high temperature
Install Notes
- Clean the stud threads and nut seating surfaces thoroughly.
- Apply a small amount of high-temp anti-seize if appropriate for your application.
- Tighten in the factory sequence and torque to OEM specification; re-torque after initial heat cycles if required by your procedure.
- Inspect manifold for warpage and replace gaskets whenever hardware is renewed.
Why Buy From CPP Diesel
- ESN-verified fitment support from diesel specialists
- Fast shipping, easy returns, competitive pricing
- Deep inventory of complementary B-Series hardware and gaskets
FAQ
How many nuts do I need?
Most B-Series applications use 12 exhaust manifold nuts—sold individually. Inspect your engine to confirm the exact count.
Will this work on both 12-valve and 24-valve 5.9L engines?
Yes—this part number covers 1989–1998 12-valve and 1998.5–2007 24-valve 5.9L applications, plus 6.7L ISB through 2018. Verify by ESN for edge cases.
Should I replace studs and gaskets at the same time?
It’s recommended. Replacing the nuts alone can leave worn studs or crushed gaskets that may cause leaks.
