Product Description
Interstate-McBee M-3944593 Exhaust Manifold Bolt — 1989–2018 5.9L & 6.7L Cummins (Aftermarket Replacement)
High-quality replacement exhaust manifold bolt for B-Series Cummins applications. Built to OE form, fit, and function to secure the manifold and maintain proper sealing under heat cycling. Sold individually.
- OE-style construction: Matches factory dimensions and thread pitch for reliable clamping.
- Heat-resistant finish: Designed for high-temperature turbo/manifold environments.
- Direct replacement: Installs like stock—no modifications required.
Specifications
| Brand | Interstate-McBee |
| Part Number | M-3944593 |
| OEM Cross-Reference | Cummins 3944593 |
| Location | Exhaust manifold to cylinder head |
| Sold As | Each (1 bolt) |
| Typical Qty Required | Varies by engine/manifold (commonly 12) |
| Material/Finish | Alloy steel, high-temp coated |
Vehicle Fitment
Always verify by engine serial number (ESN) when possible.
- Cummins 5.9L (B-Series) — 1989–2007
- Cummins 6.7L (B-Series) — 2007.5–2018
- Other B-Series applications where Cummins 3944593 is specified
What’s Included
- (1) Exhaust manifold bolt, P/N M-3944593
Recommended/Related Parts
- Exhaust manifold nuts/washers (as specified for your manifold)
- Exhaust manifold gaskets for your year/engine
- Replacement studs (if your setup uses mixed stud/bolt hardware)
- Penetrating oil/anti-seize as required by service procedure
Install Notes
- Follow the Cummins service manual for bolt sequence and torque specification.
- Inspect mating surfaces and gaskets; replace any damaged hardware.
- Tighten in stages on a cool engine to help maintain gasket crush and alignment.
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
Is this bolt sold individually?
Yes. Order the quantity needed for your engine/manifold (commonly 12), plus spares if desired.
Does this fit both 5.9L and 6.7L Cummins?
Yes—where Cummins 3944593 is specified. For edge cases, verify by ESN.
What torque should I use?
Refer to the Cummins service manual for your exact year/engine and manifold. Torque can vary by application and hardware finish.
