I just finished this job today. Never a bad idea to do other maintenance items while you’re pulling them. I enjoyed doing the timing belt job so much, that i decided to make myself do it twice. I can’t emphasize enough- DEFINITELY use silicon or some other gasket sealer to set the waterpump gasket to the water pump.
My first time through, I didn’t use any sealant or anything. After all the work, everything was back on the car- had just mounted the radiator, belts, hoses, etc. When I started adding coolant, a good sized leak developed from the top of the water pump. Re-torqued the two bolts that were accessible w/o pulling the timing cover (bottom one is covered), but no dice on stopping the leak. Evidently I had pinched the gasket, and it wasn’t making a good seal.
To make things worse, in order to pull the water pump, you have to pull absolutely everything, including the timing belt tensioner/belt.
Please learn from my mistake
My part list was:
tstat + oring
oil + filter
waterpump + gasket
new coolant hoses
new belts
new plugs
new cap + rotor
new timing belt
new t-belt tensioner, spring, and pin