Description

The Cummins Exhaust Manifold Bolt C3944593 is a high-strength, OEM-spec fastener designed to securely mount the exhaust manifold to the cylinder head in Cummins diesel engines . Manufactured to precise factory specifications, this bolt delivers proper clamping force, heat resistance, and long-term reliability in extreme exhaust-temperature environments. Exhaust manifold hardware is exposed to intense heat cycling, vibration, and corrosive exhaust gases. The C3944593 bolt is produced from premium alloy steel and treated to withstand high temperatures without stretching, galling, or loosening. Correct manifold bolt integrity is critical to preventing exhaust leaks, maintaining turbo efficiency, and protecting the cylinder head and manifold sealing surfaces. For applications requiring a studded flange , Cummins part number C3944655 is recommended. Using the correct fastener type ensures proper alignment, even load distribution, and reliable sealing depending on the exhaust manifold and flange configuration. This exhaust manifold bolt is commonly replaced during exhaust manifold service, turbocharger removal, cylinder head repairs, and complete engine rebuilds . Replacing exhaust hardware during service helps prevent repeat failures caused by heat-fatigued or seized fasteners. Fitment & Options Standard Exhaust Manifold Bolt: C3944593 Studded Flange Application: Use C3944655