Oil Cooler Core Fits Cummins NH855 NT855 NT495 NTA855 3412285 3045483 3018692

Oil Cooler Core for Cummins NH855 NT855 NT495 NTA855

This oil cooler core is a direct replacement heat exchanger for Cummins NH855, NT855, NT495, and NTA855 engines, cross-referencing OEM part numbers 3412285, 3045483, and 3018692 to keep engine oil temperatures in check.

Overview

This oil cooler core is a drop-in heat exchanger designed to regulate engine oil temperature on Cummins NH855, NT855, NT495, and NTA855 power plants. It transfers heat between the oil and coolant circuits to protect bearings and extend oil life under sustained load. A solid choice for rebuilders, fleet mechanics, and owners replacing a leaking or clogged cooler core.

Built For Performance

• Cross-references OEM part numbers 3412285, 3045483, and 3018692 for straightforward matching
• Fits Cummins NH855, NT855, NT495, and NTA855 engine families
• Engineered as a direct-fit heat exchanger for the original cooler housing
• Construction suited to continuous coolant and oil flow under working temperatures
• Replacement core restores oil temperature control after leaks or internal clogging

Fits These Machines

• for Cummins NH855
• for Cummins NT855
• for Cummins NT495
• for Cummins NTA855

On-The-Job Use

• Engine rebuilds and top-end overhauls on Cummins big bore diesels
• Fleet maintenance when oil temperature runs high or coolant mixes with oil
• Generator, marine, and industrial applications running the 855 series platform
• Replacement of a cracked or internally plugged cooler core

Specs At A Glance

Good To Know

Q: Should the cooler core be flushed before installation? A: Yes, flush the coolant passages and inspect the housing for debris so the new core is not immediately contaminated. Replace any worn seals or gaskets at the same time.

Q: How do I confirm this core fits my engine? A: Match your engine serial number and existing cooler part number against the cross-references listed above before ordering. Fit can vary by build year and application.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.