Tilton 6000-Series Hydraulic Release Bearing (98-1110) - Manual (Page 2)

Tilton Engineering, Inc. 25 Easy Street • PO Box 1787 • Buellton, CA 93427 • www.tiltonracing.com
MASTER CYLINDER SELECTION
Most 10.5” or 11.0” clutches will require a 7/8” bore master cylinder when used with this
hydraulic release bearing and a clutch pedal ration between 5:1 and 7:1.
HYDRAULIC LINES
This bearing is supplied with two identical lines installed for the supply and bleed ports.
Both lines are sized AN-4 and should only be used with AN type fittings. It is important
that whichever line is on the bottom is used as the supply line (connected to the master
cylinder) and whichever line is on top is used as the bleeder.
1. Attach the supply line to the master cylinder using your choice of rigid or flexible line.
If using a Tilton master cylinder (which have AN-3 outlets) you will need a AN-3 male to
AN-4 male adapter (such as Earl’s part number 963243).
2. Attach the supplied bleed adapter and bleed fitting to the bleed line.
HYDRAULIC RELEASE BEARING BLEEDING
1. Fill the master cylinder reservoir with DOT3 or DOT 4 brake fluid. Do not use DOT 5,
silicone based or high temperature resistant brake fluids designed for more than 550ºF
as some will cause the seals to swell.
2. Apply light force on the clutch pedal. You want enough force to hold the bearing out
against the clutch diaphragm spring, but not enough to compress the clutch dia-
phragm spring.
3. Open the bleedscrew that is attached to the bleed line on the hydraulic release bear-
ing.
4. Completely stroke the pedal and hold the pedal down.
5. Close the bleedscrew that is attached to the bleed line on the hydraulic release bearing.
6. Let the pedal return to its relaxed position and wait a few seconds.
Repeat Steps 2 through 6 until all air is removed from the system.
Note: Do not stroke the pedal again before the pedal stop is set.
SETTING THE CLUTCH PEDAL STOP
You MUST use a pedal stop to limit the amount of bearing travel. Failure to do this WILL
result in clutch, bearing and/or transmission damage!
1. Lift the drive wheels off the ground and support the car on jackstands.
2. With the engine off, put the transmission into 1st gear and have someone attempt to
rotate the drive wheels.
3. Depress the clutch pedal slowly until the clutch disengages and the drive wheel can be
rotated. Do not push it any further.
4. Note the clutch pedal position at this point. Adjust the pedal stop bolt to allow an ad-
ditional 1/4” of pedal travel.
MAINTENANCE
Spin the bearing race and check how it feels. If it has a higher than normal resistance or has
a slightly notchy feel, replace the bearing. The replacement bearing is Tilton part number
62-618.
The piston can be removed and replaced without having to break the hydraulic seal or per-
forming the bleeding procedure. Remove the piston assembly and check for any scoring in
the bore or on the piston surface. Wipe the piston and orange wiper seal before installing.
You may find that the piston is not dry. This could be the rubber grease used when install-
ing the new seal at the factory. Do not mistake this for brake fluid.
If the seal needs to be replaced, the seal replacement kit is Tilton part number 62-905.
Remove the piston assembly to access the hydraulic seal. Inspect the piston and hydraulic
assembly bore for scratches. To remove the hydraulic seal from the release bearing assem-
bly, block one hydraulic port and apply 5 PSI of air pressure to the other port. Wear safety
glasses and point the seal exit path away from you! Never try to pry the seal out of the
assembly. Refer to Diagram 4 when installing the new seals and ensure that the flat side of
the main hydraulic seal rides against the piston. Always use rubber grease, such as Tilton
P/N RG-17, when installing the seal. Take care not to damage the seals during installation.