691840 Coolant Tube for Detroit Series 50 / 60. Replaces 23505899

It is designed for Detroit Series 50 coolant tube and Detroit Series 60 coolant tube applications. Verify your engine family and configuration before ordering, as routing and connections can vary by model year. Matching the original tube shape and mounting points helps ensure proper coolant flow.

Yes, it replaces 23505899 as a direct replacement engine coolant pipe. Confirm the part number on the removed component and compare overall length, bends, and port locations before installation. Using the correct replacement helps prevent leaks and overheating issues.

Allow the engine to cool fully, drain coolant to a safe level, and clean the mating surfaces before fitting the engine coolant pipe. Replace any worn O-rings, gaskets, or clamps and torque fasteners evenly to avoid stressing the tube. After refilling, pressure-test and recheck for seepage once the engine reaches operating temperature; PAI 691840 should seat securely without forcing alignment.