Impreza WRX STI F4-2.5L DOHC Turbo (2007)
OIL LEAKING
1) Lift up the vehicle.
2) Even if the location of the leak can be easily found by observing the leaking condition, it is necessary to thoroughly remove the fluid from the
suspected portion and turn the steering wheel from lock to lock about thirty to forty times with engine running, then make comparison of the
suspected portion between immediately after and several hours after this operation.
3) Inspect leakage from "a".
The oil seal is damaged. Replace the valve assembly with a new one.
4) Inspect leakage from "b". The torsion bar O-ring is damaged. Replace the valve assembly with a new one.
5) Inspect leakage from "c". The oil seal is damaged. Replace the valve assembly or oil seal with a new one.
6) Inspect leakage from "d". The pipe is damaged. Replace the faulty pipe or O-ring.
7) Inspect leakage from "g".
The hose is damaged. Replace the hose with a new one.
8) If leak is other than a, b, c, d, or g, and if oil is leaking from the gearbox, move the right and left boots toward tie-rod end side, respectively, with
the gearbox mounted to the vehicle, and remove fluid from the surrounding portions. Then, turn the steering wheel from lock to lock thirty to forty
times with the engine running, then make comparison of the leaked portion immediately after and several hours after this operation.
(1) Leakage from "e"
The cylinder seal is damaged. Replace the rack bushing with a new one.
(2) Leakage from 'T'
There are two possible causes. Take the following step first. Remove the pipe assembly B from the valve housing, and close the circuit with ST.
ST 926420000 PLUG
Turn the steering wheel from lock to lock thirty to forty times with the engine running, then make comparison of the leaked portion between
immediately after and several hours after this operation.
^
If leakage from 'T' is noted again:
The oil seal of pinion and valve assembly is damaged. Replace the pinion and valve assembly with a new one. Or replace the oil seal and parts that are
damaged during disassembly with new ones.
