[Supras] Stock oil pump

[berniek at technicaldevelop.com]

The stock pump in my JDM core was like new.  I had previously bought one 
used, and found the angular slop in the gears from wear to be 
excessive.  The stock pump worked fine.  Judging from the cylinder wall 
condition, the JDM probably had 40K to 60K easy miles (it was from an 
automatic)


I started with about 1/8" of shimming in both the pump relief and bypass 
relief valves, filled the crankcase with 10W oil with the engine 
assembled on the stand with the spark plugs out and just a few pan 
screws in.  Turned it over at the damper bolt with a heavy 1/2" drill 
and found the oil pressure to be 80-100 PSI, so removed most of the 
shimming.  In the '91T, it is fine, although the new sender reads 20 PSI 
low.  I suspect that many of them do this because I had exactly the same 
situation in the '90 which I sold at 156K miles.  I checked the pressure 
by punching a hole (no chips) in the bottom of a new oil filter, 
soldering in a piece of 1/4" copper tubing, and connecting to an 
accurate gauge.  When hot, there is very little pressure drop across the 
element at idle, and the real gauge reads about 18-20 PSI.  The dash 
gauge reads almost zero even with the new sender. 


Also, I moved the pickup back to the rear kickup in the pan, after all I 
had read about starvation on acceleration, running a quart high, etc.  
Have photos of how to do it if anyone is interested. 


BernieK