So I had a busy couple of days over the weekend, I had been doing some work on the MR2 a week or so ago and when I moved the car I noticed a few drops of coolant on the ground under the car so I went looking to find where it was coming from and tracked it back to coolant leaking from the weep hole on the water pump, great....
So I ordered in a new pump but I ordered the updated water pump from the ST205 part number 16100 79236 which has a different impeller wheel than that of a regular 3SGTE pump that is supposed to reduce pump capitation at higher RPM even though mine does not see a lot of time spent at high RPM I figured if I am replacing it I may as well get the update pump anyway.
So what a fun job changing the water pump on a SW20 is.... almost one whole day to get the old pump out then another day to get everything back together, wow I will put that down as an experience but at least I now know what it takes to do it or also what is involved in doing a timing belt whilst in chassis.
here is a couple of images of the impeller differences between the ST205 pump vs the regular 3SGTE pump. The regular 3SGTE pump is on the left and has a pressed metal impeller, The ST205 3SGTE pump is on the right and has a cast impeller.
Inside the new pump you can just see the updated impeller.
And the fun I had