Replacement Engine Overhaul Kit for Cummins ® C/ISC/QSC/ISL/QSL Applications ISL – CM850

What’s Included

Cummins ISL / CM850 Rebuild Kit with HPCR Fuel System (High Pressure Common Rail)

Piston # 4089646

Piston Top # 4941392

Cummins CPL# 8221, 8389, 8458, 8662, 8717, 8718, 8780

Rebuild Kit Includes:

(6) Cylinder Kits

Piston

Pin & Retainer

Piston Rings

Cylinder Liner

Liner Seals

(6) Rod Bearings

(1) Main Bearing Set

(2) Thrust Washers

(1) Upper Gasket Set

(1) Oil Pan Gasket

(1) Lower Gasket Set with Crank Seals

Application & Fitment

• Engine Make: Cummins
• Engine Model / Application: C/ISC/QSC/ISL/QSL

Confirm the original part number and engine identification before ordering. Where applicable, also verify serial-number range, production year, piston style, bearing size or other configuration notes shown in the product information.

Part Numbers & Cross References

• Interstate-McBee Reference: OH4089646

Need Help Confirming Fitment?

Use the engine model, serial number and original part number when checking compatibility. For kits and sets, review the complete component breakdown above before ordering because contents can vary by engine configuration.