Interstate McBee - Cummins 4B B/ISB/QSB Upper Engine Gasket Set - M-3804896

The Interstate-McBee Upper Engine Gasket Set (M-3804896) is engineered for Cummins® B/ISB/QSB 4B engine applications. Designed for precision sealing and dependable performance, this set includes everything needed for a top-end rebuild, from cylinder head gaskets to injector seals. Built to meet or exceed OEM standards, it’s the perfect solution for preventive maintenance, repair, or overhaul.

Key Features:

• Compatible with Cummins® 4B B/ISB/QSB engine applications

• Comprehensive kit includes seals, gaskets, and washers for upper engine service

• Manufactured to OEM specifications for fit, durability, and performance

• Ideal for agriculture, construction, and light- to medium-duty diesel applications

• Backed by Interstate-McBee’s warranty and trusted performance standards

Engine Compatibility:
Cummins® 4B / B / ISB / QSB Series

Kit Includes (BOM Parts List):

• M-3903380 – Banjo Seal (4)

• M-3906659 – Injector Seal (4)

• M-3906694 – Rectangular Ring Seal (1)

• M-3906773 – Washer (1)

• M-3910824 – Rocker Cover Bolt Seal (4)

• M-3912220 – Metal Gasket (1)

• M-3938153 – Intake Manifold Gasket (1)

• M-3918188 – Washer (2)

• M-3919358 – Injector Sleeve (4)

• M-3921640 – Valve Stem Seal (8)

• M-3923261 – Injector Seal (4)

• M-3923331 – Thermostat Seal (1)

• M-3927154 – Exhaust Manifold Gasket (4)

• M-3937706 – Gasket - Turbo Oil Drain (1)

• M-3936876 – Rectangular Ring Seal (1)

• M-3283333 – Cylinder Head Gasket (1)

• M-3930906 – Valve Cover Gasket (4)

• M-3930543 – Noise Isolator (4)

• M-3900808 – Washer (4)

• M-3901356 – Gasket (1)

• M-3902425 – Sealing Washer (1)

• M-5264569 – Oil Drain Gasket (1)

⚠️ Opened packages are not eligible for return.