streetxtreme
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i found myself in the same situation
i just bought my car with a broken rack
i replaced the rack
then i realized that the car's power steering pump is dying because i would have to rev up to get power to the steering
so i replaced the pump with a used one which then blew the power steering high pressure line
i got my line repaired by a hydralics place
they reused the fittings and the restrictor thats in the line
after i installed the line, i would never be able to bleed the system
i would bleed it til there were no bubbles, but as soon as the engine was started, foam would start to build up in the reservoir
i thought it was the pump again so i replaced it with a rebuilt one
same foaming problem
so i thought it was the reservoir being clogged up, so i gutted the reservoir.
same thing
before the line went, there was never a foaming problem
we inspected the line and realised that it was a little to short and thinner than the original
i will be bringing it back to have them redo the line
i believe that the line has too much restriction causing the atf to be over heated in the pump causing the foam
hope i am right
Sc400 Power Steering Problem
in 92 - 00 Lexus SC300 / SC400
Posted
ok, so i thought i should follow up.
i SOLVED THE PROBLEM
after replacing all the rubber lines and clamps,
2 power steering pumps
and a steering rack
the problem with the foam was the inlet tube seal
the metal inlet that is attached to the pump with 2 12mm bolts on the side
there is a rubber seal in there that hardened up and was sucking in small air bubbles with the fluid from the reservoir. therefore causing the foam
how did i confirm that?
i had a air blower and blew air near the inlet of the power steering pump and guess what i saw.
it was lots of air rushing out the reservoir
this was with the car off of course
so there you go.
if anyone has a foaming problem with thier pumps, check that inlet seal first
its a 10cent part
i've spent about 500 so far
but oh well, you pay to learn