Let's solve my 20V conversion problems

[jondee86]

It sounds as if you have two separate and unrelated problems.

If the front crankshaft oil seal is leaking, there are a number of
possibilities. The housing could be scored/damaged, the shaft sealing
surface could be scratched/scored/grooved, or the seal might have been
damaged during installation. Seal replacement is covered in the FSM, and
you should be able to do the job with the engine in the car. Buy a new
seal from Toyota, or from any reputable industrial bearing and seal shop.

Inspect all the surfaces carefully before installing the new seal, and
position it slightly forward or back from any wear groove in the shaft.
Make sure the seal is pressed a mm or two past the chamfer, and don´t
forget to put a smear of grease on the seal face (rubbing surface).

Waterpump sealing surfaces can get a bit crudded up with corrosion and
pieces of old gasket sticking to them. You need to get them as clean and
flat as possible, and use some ¨ready-gasket¨ type sealer any place
that looks a bit suspect. You could ditch the bling radiator cap for a new
standard Toyota item, and check the thermostat is installed with the
jiggle valve at the top.

20V engines are known to burn a lot of oil when run on thin synthetic
oils. Don´t run anything thinner than the factory recommendation, and
a semi-synthetic from any name supplier should be fine. Likewise, 20V´s
are also known to run rich if they are unhappy about something. A new
O2 sensor often helps, and the ¨leaking capacitors¨ in the factory ECU
has been implicated in a host of poor running issues.

Cheers... jondee86