Kenworth T680 Engine Parts & Cooling

Frequently Asked Questions About Kenworth T680 Engine Parts & Cooling

What year models of Kenworth T680 are these engine parts compatible with?

Most engine parts and cooling components in this category fit Kenworth T680 models from 2013 to present. However, there are important variations between pre-2017 and post-2017 models due to EPA regulation changes. Always verify compatibility by checking your OEM number or engine serial number. PACCAR MX-13 engines (2013-2016) may require different parts than the updated MX-13 EPA2017 engines. For Cummins ISX15 equipped trucks, parts compatibility typically spans 2013-2020 model years.

How difficult is it to replace cooling system components like radiators or charge air coolers?

Replacing major cooling components typically requires 4-8 hours of labor depending on the part. Radiator replacement involves draining coolant, removing the fan shroud, disconnecting upper and lower hoses, and unbolting the radiator support brackets. Most DIY mechanics with basic tools can complete this job. Charge air cooler replacement is more complex, requiring removal of the front bumper and grille assembly. We recommend having a second person assist with lifting and positioning these heavy components. Always replace coolant and check for leaks after installation.

What are the differences between OEM and aftermarket engine parts for the T680?

OEM parts from PACCAR or Cummins carry original equipment warranties and exact fit guarantees but cost 30-50% more than quality aftermarket options. Aftermarket brands like Dorman, Gates, and Dayco offer comparable quality for wear items like belts, hoses, and thermostats. For critical components like water pumps and oil coolers, OEM parts provide better longevity. Aftermarket radiators and charge air coolers often feature upgraded aluminum cores that improve cooling efficiency over stock units.

Which coolant type should I use for my T680 engine?

PACCAR MX engines require OAT (Organic Acid Technology) extended life coolant meeting PACCAR specification P-1705016. This is typically a red or pink coolant with a 750,000-mile service life. Cummins ISX engines use either OAT or nitrite-free ELC coolant meeting Cummins CES 14603 specifications. Never mix different coolant types as this can cause gel formation and cooling system damage. Most T680s hold between 11-14 gallons of coolant depending on engine configuration.

What are the most common engine cooling problems on the T680?

The most frequent issues include EGR cooler failures (particularly on 2013-2016 models), leaking coolant overflow bottles, and charge air cooler leaks causing coolant consumption. Water pump failures typically occur between 400,000-600,000 miles. Thermostats can stick closed around 300,000 miles, causing overheating. Regular coolant analysis every 150,000 miles helps identify problems early. Installing coolant filters and using supplemental coolant additives extends component life significantly.