🔧 Product Description
Aftermarket replacement Aftercooler Tube Bundle/Core - Replaces Part Number: 4933306
New copper-nickel aftercooler bundle replacing Cummins 4933306, 3977272 and 4933309. It is the removable heat-transfer core used inside the 5.9L B-series marine aftercooler housing.
⚙️ Key Features
• Bundle/core-only replacement
• Cross-references Cummins 4933306, 3977272 and 4933309
• Copper-nickel seawater tube construction
• Designed for 6BTA 330/370 Diamond and QSB 5.9 aftercoolers
• Allows overhaul of a serviceable original housing
🧰 Kit / Assembly Contents
• 1 × Aftercooler tube bundle/core - replacement P/N 4933306 / 4933309
• Housing, end covers, O-rings, stabiliser strips and mounting hardware are not included unless stated
• Use Service Kit A P/N 4025341-13A for the required seals and core stabilisers where applicable
🔄 Supersession & Cross Reference
OEM Supersession Chain:
• 4933309 → Later service reference associated with 4933306
• 4933306 → Cross-references 3977272
• 3977267 / 4019971 (related B-series aftercooler-core references on specified housings)
OEM / Related Numbers:
• 3977272
• 4933309
• 3977267
• 4019971
• 4025341-13A
Aftermarket / Verified Equivalents:
• SMX/Seaboard Marine: AC-BCCORE-KIT
• Mr Cool: MRC4933309 aftercooler bundle
• Seakamp copper-nickel B-series aftercooler core
🚤 Compatibility
Commonly used on:
• Cummins 5.9L B-series marine aftercoolers
Typically suits:
• Engine / Equipment models:
• 6BTA 5.9 330 Diamond
• 6BTA 5.9 370 Diamond
• QSB 5.9 applications using the serviceable B-series aftercooler housing
• Output / Engine Rating: Approximately 330HP - 380HP
• Engine / System Type: Inline six-cylinder turbocharged and seawater-aftercooled marine diesel engine
• Year Range: 6BTA Diamond/QSB 5.9 production; housing- and serial-dependent
• Serial / Model Identification: Pressure-test the housing and replacement bundle separately; order the seal/stabiliser kit at the same time.
🔌 Function
The tube bundle is the heat-transfer core inside the aftercooler housing. Raw water passes through the bundle while compressed intake air passes around it, reducing charge-air temperature before combustion.
Common signs of failure:
• Loss of power or elevated exhaust-gas temperature
• Restricted seawater flow through the aftercooler
• Saltwater staining or corrosion inside the housing
• Charge-air temperature remaining excessive under load
• Bundle leakage or failed pressure test
📦 Condition
• New aftermarket replacement part
• Brand new
• Supplied in original or equivalent packaging
