6.7 Cummins Coolant Reroute Kit for 2013-2018

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Yes. The 6.7L Cummins turbocharger uses both oil and coolant to manage heat in the bearing housing. Coolant lines run from the engine's cooling circuit to the turbo bearing housing and back. This water cooling prevents heat soak in the bearings after the engine is shut down hot — a common cause of premature turbo bearing failure on oil-only cooled turbos. Maintaining these coolant lines in good condition is important for turbo longevity, particularly on high-mileage trucks and on builds where the turbo has been upgraded to a higher-output unit.

The Diesel Power Source® 6.7 Cummins coolant reroute kit eliminates the failure-prone plastic coolant riser pipe on 2013–2018 trucks and reroutes the coolant circuit through steel braided hose, silicone hose, machined fittings, and a new aluminum coolant tank. It also relocates the coolant tank to clear space for compound turbo kits and 3rd gen swap installations. This kit is designed for trucks that have had the EGR system deleted and is not compatible with the stock EGR configuration.

On 2007.5–2012 trucks the compound kit installation typically does not require coolant system changes beyond ensuring the turbo coolant lines are in good condition. On 2013–2018 trucks where the compound kit requires moving or removing components in the area where the plastic coolant riser is located, the coolant reroute kit is effectively required as part of the compound installation — it clears the space needed for the compound turbo system while simultaneously eliminating the failure-prone stock components. Diesel Power Source® recommends addressing the coolant riser proactively on any 2013–2018 truck being modified.

Cummins recommends a coolant flush interval of approximately 150,000 miles or 5 years for the OAT coolant used in the 6.7L, whichever comes first. On trucks used for heavy towing where the cooling system operates near capacity regularly, erring toward the shorter end of that interval is reasonable. Using the correct OAT-specification coolant at the correct concentration — typically 50/50 with distilled water — is important for corrosion protection in the aluminum components of the cooling system. Do not mix coolant types or use tap water for top-offs.

EGR cooler failure on the 6.7L Cummins typically presents as white smoke from the exhaust during warmup or under load, unexplained coolant loss without visible external leaks, a sweet smell from the exhaust, or in more advanced cases, coolant contamination of the oil. A combustion gas test of the coolant — which detects exhaust gases dissolved in the coolant — is the most reliable early-stage diagnostic. Addressing EGR cooler failure promptly prevents the more serious damage that comes from extended coolant contamination of the engine's oil system.

For a direct-fit VGT replacement or a Turbonator® VGT upgrade on a 6.7L, the factory coolant lines can typically be reused if they are in good condition. When upgrading to a 3rd gen swap kit or compound system on a 2013–2018 truck, the coolant reroute kit is required to clear the space needed for the new turbo positioning and to replace the factory plastic components that are incompatible with the new layout. On any turbo upgrade, inspecting the existing turbo coolant lines and replacing them if they show signs of age or degradation is a worthwhile step that protects the new turbo investment.