Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual - part 409
5MT-57
Main Shaft Assembly for Single-Range
MANUAL TRANSMISSION AND DIFFERENTIAL
• When the ring inner surface is abnormally or par-
tially worn down.
• When the contact surface of the synchronizer
ring insert section is cracked or abnormally worn.
• If the gap between the end faces of the ring and
the gear splined part is excessively small, check
the clearance (A) while pressing the ring against
the cone.
Clearance (A):
0.5 mm (0.020 in) or more
Single cone
Double cone
• Apply gear oil to the cone of the gear and while
press-fitting the baulk ring, check there is no rota-
tion in the circumferential direction.
5) Shifting insert key
Replace the insert key if deformed, excessively
worn or defective in any way.
6) Oil seal
Replace the oil seal if the lip is deformed, hard-
ened, worn or defective in any way.
7) Coupling sleeve and synchronizer hub
• Check the slipping condition of the coupling
sleeve.
• Check the splines on the coupling sleeve and
synchronizer hub for wear.
8) O-ring
Replace the O-ring if the sealing face is deformed,
hardened, damaged, worn or defective in any way.
9) Gearshift mechanism
Repair or replace the gearshift mechanism if ex-
cessively worn, bent or defective in any way.
F: ADJUSTMENT
Selection of main shaft rear plate:
Measure the protrusion amount (A) of double taper
roller bearing from transmission main case surface,
and select a suitable plate in the following table.
NOTE:
Before measuring, tap the end of main shaft with a
plastic hammer lightly in order to make the clear-
ance zero between the main case surface and
moving flange of bearing.
MT-01673
(A)
MT-01674
(A)
Dimension (A)
mm (in)
Part No.
Mark
4.00 — 4.13
(0.1575 — 0.1626)
32294AA041
1
3.87 — 4.00
(0.1524 — 0.1575)
32294AA051
2
MT-01807
(A)