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REPLACE WATER PUMP.DRAIN THE COOLING SYSTEM.DISCONNECT THE RADIATOR INLET HOSE FROM THE INLET PIPE. REMOVE TIMING BELT FROM THE WATER PUMP PULLEY.REMOVE THE WATER INLET HOUSING AND THERMOSTAT.REMOVE THE MOUNTING BOLTS AND STUDS. LIFT OUT THE WATER PUMP BY CAREFULLY PRYING BETWEEN THE PUMP AND THE CYLINDER HEAD.REMOVEOLD PACKING AND CLEAN THE MOUNTING SURFACES. INSTALL NEW SEAL PACKING TO THE WATER PUMP GROOVE AND NEW O - RING TO THE WATER BYPASS PIPE.INSTALL NEW WATER PUMP TORQUE BOLTS 14 FT LBS.
Lexus Is very particular on thier settings for the timing.It has to be on the mark, with no slack. They will run, But if the belt is not super tight it will throw timing faults. When I do timing jobs I use a pry bar and put as much pressure that I can on the belt tensioner.before I tighten it down. This assures me that the is no slack and actually stretches the belt. very little stretch, but it does. Since I started doing this I haven't had any problems with any timing jobs that I do.
My car is a 2001 Lexus ES300 and has 106K miles. I brought it to my mechanic to replace Thermostat, Thermostat Gasket, Timing Belt, Water Pump, Camseals Kit, Crankseal, Air Filter, Fuel Filter, Timing Component and Spark Plugs for a total of $981.24 ($510 of it is labor). He charges at least 1/2 of a dealer so expect to pay more elsewhere. The care drives like a brand new car and I will keep driving it for another 10 years!!!
60,000 miles is recommended by Toyota/Lexus. Replacing the water pump is recommended because its driven by the timing belt. If not replaced and it fails in the future, you would have to re-do everything again!!
the front bank is bank 2, the rear one is bank one. The cylinders go from the timing belt side to the right. So 3 is the middle on the back bank, and four is the middle cylinder on the front bank. They are both in the middle so just replace them.