Tiffin Allegro Bus Engine Coolant Leak Repair Guide (Cummins ISL 8.9L)
Key Takeaways The Cummins ISL 8.9L engine in the Tiffin Allegro Bus has six primary coolant leak points: the water pump weep hole, coolant filter housing, EGR cooler, charge air cooler, hose connections, and freeze plugs.A cooling system pressure test…