Subaru 2009 IMPREZA, Service Manual

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4AT-90
Oil Pump Housing
AUTOMATIC TRANSMISSION
2) Apply ATF to a new O-ring and attach to the oil
seal retainer. Install the seal to the oil pump hous-
ing bore.
3) Install the oil seal being careful not to damage oil
seal lip, and secure it using three bolts.
Tightening torque:
7 N·m (0.7 kgf-m, 5.2 ft-lb)
E: INSPECTION
1) Check the seal ring and oil seal for breaks and
damage.
2) Check other parts for dents or faults.
3) Oil pump rotor assembly selection
(1) Tip clearance
Install the inner rotor and outer rotor to the oil
pump. With rotor gears facing each other, mea-
sure the crest-to-crest clearance.
Tip clearance:
0.02 — 0.15 mm (0.0008 — 0.0059 in)
(2) Side clearance
Set a depth gauge to oil pump housing, then
measure the oil pump housing-to-rotor clear-
ance.
Side clearance:
0.02 — 0.04 mm (0.0008 — 0.0016 in)
(A) O-ring
(A) Oil seal retainer
(B) Drive pinion shaft
AT-03361
(A)
(A)
(B)
AT-03598
(A) Thickness gauge
(B) Inner rotor
(C) Outer rotor
(A) Depth gauge
(B) Inner rotor
(C) Outer rotor
AT-01038
(B)
(C)
(A)
AT-01039
(A)
(B)
(C)