Interstate-McBee Kit - Inframe - IF4955581

The IF4955581 Inframe Rebuild Kit is a premium engine overhaul solution designed for Cummins B-Series engines, including 3.9L and 5.9L applications. This comprehensive kit enables in-chassis rebuilding, allowing for full engine restoration without removing the engine from the vehicle—ideal for fleet maintenance, vocational trucks, agriculture, and construction equipment.

Manufactured to OEM-level specifications and built in ISO 9001:2015-certified facilities, each component is engineered for durability, optimal fitment, and long-term reliability. The kit includes all the essential internal components needed to restore compression, reduce oil consumption, and extend the life of your Cummins B-Series engine.

Key Features:

• Designed for Cummins 4BT / 6BT / ISB / QSB B-Series engines (varies by CPL)

• Inframe design allows engine restoration without complete removal

• Manufactured to meet or exceed Cummins OEM specs

• Ideal for on-highway, off-road, and industrial applications

• Built in ISO-certified facilities for consistent quality

• Backed by a 2-year, unlimited-mileage warranty (Interstate-McBee or equivalent brand)

Kit Contents:

• (6) Pistons with Rings

• (6) Cylinder Liners

• Piston Pins & Retainers

• Main Bearing Set

• Rod Bearing Set

• Upper Gasket Set

• Oil Pan Gasket

• Thrust Washers