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Join Date: Jan 2009
Location: Eastern NC, USA
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Just completed the timing belt/water pump replacement on my '01 Sequoia. I think it's the first timing belt and the vehicle has 172k miles!!!...I couldn't sleep at night thinking of what might happen but finally got it done.
1) use a box with holes or pegboard to keep track of all the bolts. There are a lot of parts that need to come off and you also want to verify that everything was reinstalled properly.
2) Be careful removing wiring connectors. They will all come loose when properly unlocked. Also, work carefully to remove the camshaft position sensor from the left-hand timing cover (on your right looking into the engine bay). Remove the grommet, then release the wiring harness from the small mount and the small clip below it.
3) My Chilton manual says to remove the mass airflow (MAF) box, but leave it on. There is no reason to remove it and it didn't restrict access in any way. Do remove the intake pipe (from the air filter box to the MAF box and set it out of the way.
4) Remove the radiator - it gives you quite a bit more room to work. You're going to lose your coolant anyway when you disconnect the radiator hoses.
5) Be sure to get replacement o-rings for the heater bypass tube and the thermostat housing.
6) You'll need to remove the alternator. Loosen but don't remove the power steering pump. It is held on by two bolts and one stud. Remove the nut from the stud, back out the bolts until they are free (but no need to remove them), and slide the pump forwards (towards the radiator) so that you can slide the alternator off the top stud that retains it and set it out of the way.
7) My Chilton manual says to apply a 3mm bead of sealant around the waterpump, but my Toyota waterpump came with a gasket. You can use some gasket adhesive to hold it in place, but keep any adhesive away from the rubber portion of the gasket.
8) Use a torque wrench. Most of the thread holes are in aluminum...overtorquing can result in stripped threads and component failure!
9) Route the serpentine drivebelt before installing the fan. You'll need the fan (and fan pulley) in place to finish installing the drivebelt.
Good luck to all who attempt this job! It's time-consuming, but well worth the costs avoided. Work carefully and deliberately and refer to the manual as often as you can. Keep it handy. The schematics posted above are also very handy.