Tilton Subaru WRX-STI Package (98-1124) - Manual

Description
Tilton’s Subaru WRX/STI clutch packages are designed to offer increased torque and reduced
rotating mass. In addition, these clutch packages include a concentric hydraulic release
bearing assembly that eliminates the stock external slave cylinder and related linkage. The
clutch provides high torque capacity that enables you to “up the boost,” while it’s reduced
rotating mass results in increased horsepower to the wheels. The hydraulic release bearing
self-adjusts for clutch wear and provides great pedal feel.
Note: This instruction sheet is designed to supplement the general instruc-
tions sheets supplied with the individual components of the clutch package.
installation
Flywheel
1. Install flywheel onto engine. Torque OEM flywheel-to-crankshaft bolts to factory
specification.
clutch Discs
2. Install clutch discs into the clutch. For Carbon/Carbon clutches, orient the clutch hub as
shown in Diagram 1. For Cerametallic clutches, align hubs as shown in Diagram 2.
Be sure to align discs with an alignment tool or spare input shaft.
clutch
3. Mount clutch onto the flywheel with the supplied aircraft grade hardware. Torque
hardware to 18 lb-ft using oil or thread locking compound. The tips of the spring fingers
should taper slightly towards the transmission. The spring must not be inverted.
4. Test fit the transmission to the engine to confirm that there is no interference between
the clutch’s spring retaining hardware and the inside of the transmission case. There
should be .075” of clearance, but due to variations in transmission castings the clearance
may be decreased. If there is interference, you may have to grind the tips of the spring
retaining screws to be flush with the nuts and/or grind some material from the transmis-
sion case.
hyDraulic release Bearing assemBly
1. Remove the existing Original Equipment (OE) slave cylinder, fork arm and release bearing
from the transmission.
2. Tighten the two AN3 male-to-male hydraulic fittings into the two ports of the hydraulic
release bearing assembly. Do not use any thread sealing compound, as the fitting seal on
the taper and not the threads.
3. Thoroughly clean off the pilot tube (the tube around the input shaft on which the origi-
nal release bearing would slide)
removing all dirt and grease.
4. Test fit the hydraulic release bearing (HRB) assembly onto the transmission’s pilot tube
to ensure it is sitting flat and parallel. Due to variations in transmission castings, the HRB
may not sit flat. You can check if it is sitting flat by placing a bubble level across the top of
the release bearing.
Note: Flatness can be corrected by:
5-speed transmissions: Grinding/sanding the casting imperfections on the pilot tube.
6-speed transmissions: Grinding the heads of the four bolts flat.
5. Place a small bead of high temperature RTV silicone around the pilot tube ½” – 1” from
its base. This will help to hold the hydraulic release bearing assembly in place once it is
installed.
Subaru WRX/STI Clutch Package
INSTALLATION INSTRUCTIONS
98
-11
24
V = Solid, 8 rivet, outer (.375" thick)
V V
FL
Y
W
H
EEL
CL
U
TCH
C
O
V
ER
FL
Y
W
H
EEL
CL
U
TCH
C
O
V
ER
Offset
Diagram 1
Diagram 2