Jeep 4.0 Water Pump Replacement | 1989 Comanche (Renix)

Full water pump replacement on my 1989 Jeep Comanche with the Renix 4.0: finding the leak, choosing a pump, fighting a stuck pulley, FSM torque specs, and burping the closed cooling system. Most of this applies to any 4.0 Cherokee or Comanche, with a few Renix-specific notes along the way. CHAPTERS 00:00 Diagnosing the coolant leak 4:12 Choosing a water pump (Gates vs Mopar) 7:15 Draining the coolant 8:14 Breaking the pulley bolts loose 9:45 Removing the serpentine belt 11:47 Removing a stuck water pump pulley 12:50 Water pump bolt locations and removal 18:30 Old vs new pump comparison 20:02 Gasket sealant and scraping the old gasket 22:13 Replacing the water pump inlet pipe 26:27 Installing the new water pump 31:49 Torque specs and reassembly 36:02 Burping the cooling system (pressure bottle) 40:03 Leak check and test drive TORQUE SPEC Water pump bolts: 13 ft-lbs / 156 in-lbs (18 N·m), from the 1989 factory service manual. Some later manuals and websites list 20–22 ft-lbs, so check the FSM for your year. PARTS I USED Gates 42004 water pump: https://amzn.to/4z3jLKS Permatex 22071 gasket maker: https://amzn.to/4rNe3dN Dorman 56398 water pump inlet pipe: https://amzn.to/4xRKyJe Dorman 902-3010 thermostat housing with gasket: https://amzn.to/4hjuHOC As an Amazon Associate I earn from qualifying purchases. Used Renix and Comanche parts pulled from my own Jeeps: https://www.ebay.com/usr/rl-motors RELATED SHORTS Fastest way to drain coolant on a Jeep 4.0:    • Fastest way to drain coolant on a Jeep 4.0L   Renix Jeep 4.0 serpentine belt removal:    • Jeep Renix 4.0 belt removal (1987–1990 Che...   How to burp a Renix closed cooling system:    • How to Burp a Jeep Renix Closed Cooling Sy...