Buy A4721403814 - Genuine Detroit Diesel EGR Cooler DD15 DD13 - wisentpartscenter.com

Description

Genuine Detroit Diesel A4721403814 EGR Cooler is a coolant-to-exhaust heat exchanger used on Gen 5 DD13 and DD15 engines. It removes heat from recirculated exhaust gas before that gas is sent back into the intake, allowing the EGR system to reduce combustion temperature and control NOx emissions without feeding full exhaust temperature back into the engine.

Key Functions
- Cools recirculated exhaust gas before it returns to the intake system.
- Uses engine coolant to remove heat from the EGR flow.
- Helps the EGR system lower combustion temperature and control NOx emissions.
- Handles repeated high-temperature exhaust and coolant cycles during normal engine operation.

Verify fitment with us before ordering to ensure the correct part for your application.

Purpose of the Part

The A4721403814 works as a heat exchanger between the exhaust and engine cooling systems. Hot exhaust entering the EGR circuit passes through the cooler, where heat is transferred into the coolant before the exhaust gas returns to the intake. Lowering that gas temperature helps the engine use EGR without introducing the full heat of the exhaust stream back into the combustion air.

Issue Symptoms / When to Replace

A leaking EGR cooler can cause unexplained coolant loss, white steam or smoke from the exhaust, or coolant entering the exhaust or intake path. A restricted cooler can contribute to EGR-flow problems and related fault codes. Because other cooling-system, EGR-valve, and engine problems can produce similar symptoms, the cooler should be pressure-tested or otherwise diagnosed before replacement.

Brand Information

Detroit Diesel develops heavy-duty engines and the emissions systems used on DD-series platforms. The supplied OE cooler is manufactured by MAHLE, a major commercial-vehicle thermal-management supplier that designs EGR coolers specifically to cool recirculated exhaust gas before it returns to the intake. MAHLE describes its commercial-vehicle EGR coolers as high-temperature heat exchangers designed for thermal strength, controlled EGR temperature, and resistance to soot loading.

How to Identify an OEM Part

MAHLE manufactures this EGR cooler for Detroit. The OEM unit has a MAHLE factory identification label showing Detroit part number A4721403814 directly on the cooler, along with manufacturer production and traceability information.

Why Buy A4721403814 from Wisent Parts

  • ⏱️
    Fast shipping
    Orders before 12PM EST ship same business day.
  • 🛡️
    180-day warranty
    All parts covered from delivery date.
  • ↩️
    Easy returns
    30-day returns.
  • ✅
    Verify fitment
    Send VIN/ESN and we’ll confirm.

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Warranty & Return Information
Warranty Information

Wisent Parts offers a 180-day warranty on all parts from the date of delivery. This warranty covers orders placed directly through our website. If a part fails during this period, we’re here to help - whether it’s a replacement, repair, or refund. For full details, refer to the Warranty page.

Return Information

Wisent Parts accepts returns within 30 days of delivery. All returns are subject to a restocking fee. To qualify, parts must be unused and in their original condition. For full return instructions and restocking fee details, please refer to the Returns page.