4989468 / 3974399 Aftermarket Cummins 8.3L C-Series Aftercooler Housing | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket Cummins 8.3L C-Series Aftercooler Housing - Replacement Part Number: 4989468 / 3974399

Aftercooler housing designed to support, align and seal the Cummins 8.3L charge-air cooler core.

⚙️ Key Features

• Coated marine aftercooler housing

• Designed as a direct replacement for the listed reference numbers

• Helps maintain stable operating temperature under sustained marine load

• Marine connection sizes and mounting points must match the original assembly

• Suitable for professional marine cooling-system service and replacement

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 4989468 → Supersedes 3974399

OEM / Related Numbers:

• 4989468

• 3974399

• 4025341 service-kit family

Aftermarket / Verified Equivalents:

• Mr Cool: MRC4989468 / MRC3974399

Included Components:

• Aftercooler housing - Part Number: 4989468 / 3974399

• Check valve - supplied with replacement housing

• Core-cleaning brush - supplied with replacement housing

• Assembly lubricant - supplied with replacement housing

• Two O-ring sets - supplied with replacement housing

🚤 Compatibility

Commonly used on:

• Coated marine aftercooler housing systems

Typically suits:

• Engine models:

• Cummins 6CTA 8.3 marine engines

• Cummins ISC/ISL 8.3L Tier 2 applications using housing 4989468

• Engine Displacement: 8.3L

• Construction: coated aluminium

• Package Type: housing without charge-air core unless stated

🔌 Function

The housing supports and seals the charge-air cooler core so air, coolant and seawater remain separated.

Common signs of failure:

• Boost-air temperature rises or power falls under load

• Air, coolant or seawater leakage develops

• Salt, soot or oil mist collects around the joints

• Core movement or fretting damages the housing

• O-rings become flattened, hard or cut

📦 Condition

• Brand new aftermarket replacement part

• New and unused

• Supplied in manufacturer or equivalent protective packaging