Coolant Bypass Kits are designed to re-route some coolant flow which helps lower coolant temperatures at the rear of the engine for consistent temperatures across all cylinders. A common issue in some diesel engines, the rear cylinders on a straight-six configuration experience the highest coolant temperatures due to a lack of coolant flow at the rear of the head. In a performance application, this can cause excessive pressure to build in the cooling system, causing the external freeze plugs or the small diameter plugs under the valve cover to fail. Shop now and find Fleece Performance, Full Send Diesel, and many others to keep your cooling system operating properly.
