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CUMMINS ENGINE

Home / Products / DONGFENG POWERTRAIN / CUMMINS ENGINE / ISZ Engine Brake Assembly, OE#D4327504, for Dongfeng Cummins ISZ Series Engine，Dongfeng Truck Spare Parts

ISZ Engine Brake Assembly, OE#D4327504, for Dongfeng Cummins ISZ Series Engine，Dongfeng Truck Spare Parts

This ISZ Engine Brake Assembly with part number D4327504 is original equipment spare part specially developed for Dongfeng Cummins ISZ Series Engine. As the engine auxiliary retarder, it provides strong engine braking force when the vehicle travels on long downhill sections, easing the working load of wheel service brakes. This engine brake component is widely installed on heavy‑duty Dongfeng commercial trucks with Cummins ISZ power unit for routine overhaul and failure replacement. The cast‑iron main body adopts high‑strength forging technology to sustain high mechanical stress and high working temperature inside the engine. Each unit has passed strict factory performance and durability testing before leaving stock. Many long‑haul fleets have adopted this genuine part to improve downhill driving safety and extend service brake service life.

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PRODUCT DESCRIPTION

Genuine OE Engine Brake, High‑Strength Cast Iron Construction

This original ISZ Engine Brake Assembly D4327504 is engineered exclusively for Dongfeng Cummins ISZ Series Engine. The heavy‑duty cast iron structure can withstand huge impact force and high temperature generated during engine retarder operation. All mounting hole positions, rocker arm assemblies and pivot points strictly follow original factory specifications. Direct replacement without additional machining or modification after installation. It can quickly activate auxiliary engine braking function to assist speed control for heavy‑loaded trucks on mountainous downhill roads.

Reduce Service Brake Overheating & Risk Of Brake Failure On Downhill

For heavy‑loaded long‑haul trucks running on mountain routes, continuous downhill braking easily causes brake drum overheating, fading or even sudden brake failure. After you install this D4327504 ISZ engine brake assembly, effective auxiliary retardation takes over most of the deceleration workload. It relieves the burden on wheel braking system, prevents thermal fading of friction parts, lowers frequent replacement frequency for brake pads and brake drums. It greatly enhances driving safety for fleets operating on hilly and mountain freight routes.

Factory Performance Tested Genuine Parts With Original Identification

Every D4327504 ISZ engine brake assembly is supplied as an original genuine spare part for Dongfeng Cummins ISZ Series Engine. Each finished unit goes through factory bench testing for braking performance, movement smoothness and material quality before shipment. We have supplied these engine retarder spare parts for numerous truck repair workshops and large transportation fleets. Real maintenance cases prove stable long‑term working performance same as the components fitted on brand‑new heavy‑duty trucks.

Quick Stock Supply For Engine Overhaul & Fleet Maintenance Projects

If you are sourcing replacement engine retarder parts for Dongfeng heavy‑duty trucks powered by Cummins ISZ engine, this OE‑standard ISZ Engine Brake Assembly D4327504 is your preferred option. We maintain available stock to support fast order processing and delivery for your engine overhaul jobs and regular fleet maintenance. Please send your inquiry to confirm stock quantity, matching verification and favorable bulk pricing for your truck maintenance project immediately.

TECHNICAL SUPPORT

1. Accessories selection consultation

- Provide ** intelligent selection tools ** (such as parts matching query system), input the vehicle model VIN code or engine model to match the corresponding parts number, reducing the selection error rate.

The technical team is available online 7×12 hours to answer technical questions about accessories (such as material compatibility and installation processes).

2. Customized development support

We offer specialized R&D services for special market demands (such as heat dissipation accessories for high-temperature regions in the Middle East and dedicated suspension components for road conditions in Africa), and complete sample delivery within six weeks.

3. Training and Technical materials

Provide remote/on-site training for the customer's after-sales team (such as diagnosis of electrical control accessories and DPF regeneration operation), along with multilingual versions of the "Accessories Installation Manual" and "Troubleshooting Guide".

4. Quality Traceability and Improvement

Through the QR code traceability system (one product, one code), track the production batch of accessories and the source of raw materials, respond quickly to quality complaints and initiate improvement processes.

AFTER-SALES AND LOGISTICS SUPPORT

After-sales service

Quality Assurance Policy

-The warranty period for original factory parts is 12 months (counting from the date of signature for receipt), covering material defects, process issues, and man-made damage.

- Provide "Localized Express repair Service" : Cooperate with third-party repair networks in markets such as Southeast Asia and the Middle East, and deliver emergency parts to designated repair points within 4 hours.

Return and Exchange Process

-The customer is required to submit the test report (such as a third-party appraisal) within the warranty period. After confirmation by Dongfeng, a reissue or refund will be arranged within 5 working days.

Logistics support

Warehouse Layout

-Five major regional accessory centers have been established globally (Southeast Asia, the Middle East, Africa, South America, and Europe) to achieve "next-day delivery" for mainstream accessories (covering customers within the regions).

Emergency Logistics Plan

-Emergency parts can be directly delivered within 48 hours via the "Dongfeng Exclusive Aviation Special Line" (such as engine ECU, brake valves and other key components).

Packaging Optimization

-Use shockproof and moisture-proof packaging (such as honeycomb cartons + pearl cotton), and reinforce fragile parts (such as glass, sensors), keeping the damage rate within 0.5%.