Do I need to change the water pump ? Even is I never had issue with heat in cold winter ? No Coolant(Prestone) odor or leaking... ! Seal ? (Camshaft , Crankshaft)
Could just slap on a new timing belt and call it a day leave everything else alone. No leaking from the cam seal? They tend to weep oil after a while. I've been using Dayco timing belts recently (just the belt not the kits) I really like them they use a softer rubber compound versus brands like Gates and as a result are quieter.
If you get a timing belt kit with water pump get the Aisin TKT-018.
That belt needs to go ASAP especially in a humid environment.
If you're doing the belt, it's a convenient time to do the tensioner+spring, timing belt, and cam+crank (front) seals as well as the thermostat since you're draining the coolant. Bare minimum, I'd change the belt + tensioner spring (check its dimensions).
Good luck. I did mine last year (15K miles ago). My cam seal had popped out and I was leaking a lot of oil and the timing belt was all cracked like yours.
The old cam seal looked like it was damaged when it was originally installed, so I took the semicircular cap off to make sure it was positioned correctly.
Make sure you use RTV sealant in the corners of the semicircular areas between the head cover and head, and along the half moon by the end of the intake camshaft. If you look in a repair manual it should show the locations I'm talking about.
Currently I have a 4A-FE, but my first car was an '88 4A-F. So far from diagnostics I'd almost rather go back to a carb.. early fuel injection can be annoying to deal with. They each have their ups and downs.
All the timing is good! Engine Running smooth ! No vibration..!.. But !!! Coolant/Prestone is leaking from one small spot on the new water pump !! fu$%{@ Gasket/RTV !! Need to do the job again...
I found out the problem on my Water Pump.....The Housing is crack... yes the brand new one .. 12mm bolt ... maybe too tight... but I check the old toyota oem and the bolt housing is not the same .... the Dayco one got a little angle and the OEM is straight flush.... anyway .. let you know !... shit happends..:laugh:
As far as I've seen the Dayco water pumps should match up well enough to have a flush seal.. Make sure to torque down the bolts in a criss-cross pattern. Assuming it's an aluminum housing it can either warp or crack very easily!
If it looks like it hasn't been replaced, it's worth doing when you already have the timing components off and the mount off. Spin it by hand and see how the bearing sounds. If it's not smooth and quiet, definitely replace it. Also check to see if there's any sign of seepage from either the pulley or the housing.