MB5D –

Genuine Cummins part number 3871580 is a Jake Brake engine-brake tune-up kit for compatible Cummins M11 and ISM diesel engines equipped with Jacobs 404D or 411-series engine brakes. The kit provides internal service components used when overhauling the engine-brake housings to address wear and restore proper operation.

The kit includes control-valve components, springs, retaining hardware, oil seal rings, check balls, pipe plugs, solenoid harnesses and service instructions. It is intended for engine-brake maintenance and overhaul, rather than a conventional engine ignition tune-up.

Product specifications:

Part number: 3871580
Product type: Jake Brake / engine-brake tune-up kit
Engine applications: Compatible Cummins M11 and ISM engines
Engine-brake applications: Jacobs 404D, 411, 411C, 411D and 411E
Jacobs kit reference: 19848
Quantity: 1 kit

Verify the engine-brake model and kit contents before ordering. Compatibility is determined by the brake model, not simply by whether the engine is an M11 or ISM.

Cummins identifies 3871580 for the listed brake models, and Jacobs publishes a component-by-component contents sheet for this kit.

3871580

Genuine Cummins 3871580 Jake Brake Tune-Up Kit – M11 ISM Jacobs 404D 411 Series