CATCooling System

391-6407 Aftercooler — Cat C18

This is an aftercooler, a vital heat exchanger within the engine's air intake system that cools the compressed air from the turbocharger before it enters the cylinders. Manufactured to meet stringent OEM standards, it provides efficient heat dissipation and robust construction superior to worn or corroded units. Operators might notice a loss of engine power, increased exhaust smoke, or higher operating temperatures if this aftercooler is compromised.

Aftercooler – Part No 391-6407 – CAT Spare Part
Part Specifications
BrandCAT
CategoryCooling System
ConditionAftermarket — OEM Specification
DispatchSame-day from Mumbai (before 3 PM IST)
GST InvoiceAvailable — all orders
Export DocsCommercial invoice, packing list, COO

Compatible Models

Always verify with serial number before ordering.

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Installation & Application Notes

Flush cooling system with distilled water before refilling. Use pre-mixed coolant — never plain water, which causes corrosion. Pressure-test system after any cooling repair. Check thermostat by immersing in hot water — should open at rated temperature.

Always consult the OEM service manual for model-specific torque values and procedures. WhatsApp our technical team if you need fitment guidance.

Part TypeAftercooler (Charge Air Cooler)
MaterialAluminum/Steel
ApplicationEngine Air Intake System
Service LifeReplace every 8,000 hrs or as needed
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

The initial symptom of an aftercooler issue is often a noticeable reduction in engine power, especially under load. If the problem progresses, you may observe excessive black smoke from the exhaust due to incomplete combustion. Failure to address a leaking or inefficient aftercooler can lead to increased engine operating temperatures and potential internal component stress.

Installation Tip

Ensure all sealing surfaces on the intake manifold and charge air pipes are meticulously cleaned before installing the new aftercooler. Avoid overtightening the mounting bolts, which can warp the core and cause leaks.

Service Note

Inspect the turbocharger's condition and the integrity of all charge air hoses and clamps when replacing the aftercooler.