Manual

ManualsBrandsTilton ManualsCar81XX Hydraulic Release Bearing (98-1138)

Description

Tilton’s 60-81XX Hydraulic Release Bearing (also known as a concentric slave cylinder) is designed to

be mounted to the gearbox or bellhousing with an adapter plate. This hydraulic bearing assembly

uses a at-faced bearing that is intended to work with most 8.5" – 11.0" bent-nger diaphragm

clutches.

The hydraulic release bearing assembly is self-adjusting in that the bearing stays close to the clutch

spring at all times. Although the spring changes position with clutch wear, there is no extra return

spring that pulls the piston back all the way to the bottomed position. In this respect, the piston in

the hydraulic bearing assembly works like the piston in a disc brake caliper, returning only as far as

forced. For this reason, with a Tilton hydraulic release bearing the feel of the clutch does not change

with clutch wear allowing the driver to make more consistent shifts.

prior to installation

1. Both ports of the hydraulic release bearing are threaded 3/8-24 UNF x .28" deep with a 37º

tapered seat and are suitable for use with standard AN-3 or JIC 37º ttings. Alternatively, the top

of the port is machined at for use with a crush washer (banjo tting installations). Two AN-3 to

AN-3 union ttings are supplied with the slave cylinder. If you choose to use banjo bolts instead,

be sure that the bolt does not stick out past the bottom crush washer by more than .28".

2. Hydraulic hose is not included with this hydraulic release bearing. It is up to you to source

high quality hose and a bleed tting assembly. We recommend the use of PTFE lined stainless

braided hose for the entire length of both the feed and bleed lines.

3. For most standard clutch pedal ratios, this hydraulic release bearing and a 8.5" – 11.0" bent-

nger diaphragm clutch will work best with a 7/8" bore master cylinder.

installation

Bearing clearance and mounting

1. Some applications may require you to cut the pilot tube o the gearbox input shaft bearing

retainer. You may need to remove the bearing retainer from the gearbox to do this.

2. As received in the box, the bearing piston may not be fully retracted. You will need to compress

it before taking any measurements. The small lip on the outside diameter of the piston is

intended to bottom against the orange wiper seal.

3. Position the bearing assembly on the surface you wish to mount it so one port points directly

up. This will be the port to which you attach the bleed line. Both ports are identical, so either

one can be placed in the upward position. The other port will be attached to the supply line. Its

orientation is not critical. Position the lines so they are clear of the clutch and ywheel.

4. Prepare the mounting surface to which the assembly will be attached. Two bolts (1/4" or 6 mm)

hold the assembly in place. Accurate positioning should be done using the inner diameter (ID)

of the base. This register should be on center with the input shaft within .010" (.25 mm).

5. Check the bearing clearance. A clutch assembly with worn friction discs will not provide

accurate results, so make sure new friction discs are used when taking measurements. The

bearing clearance must be in the range of .100"-.150" (see Diagram 1). If the clearance is less

than this range, there will not be enough room to allow for the full wear range of the clutch

since clearance reduces with clutch wear.

60-8100 Hydraulic Release Bearing

Diagram 1

Bearing Face

Spring Contact Point

.100" - .150"

Bearing Clearance

(New Clutch)

INSTALLATION INSTRUCTIONS

98-1138

Summary of content (4 pages)

PAGE 1
98-1138 INSTALLATION INSTRUCTIONS 60-8100 Hydraulic Release Bearing Description Tilton’s 60-81XX Hydraulic Release Bearing (also known as a concentric slave cylinder) is designed to be mounted to the gearbox or bellhousing with an adapter plate. This hydraulic bearing assembly uses a flat-faced bearing that is intended to work with most 8.5" – 11.0" bent-finger diaphragm clutches. The hydraulic release bearing assembly is self-adjusting in that the bearing stays close to the clutch spring at all times.
PAGE 2
Hydraulic lines and fittings Install the two supplied union fittings and tighten. These fittings are made to seal on the tapered section and not the threads. Do not use pipe tape or other sealants. Install the (customer-supplied) hydraulic lines and bleed fitting assembly, routing both of the lines clear of the exhaust system, oil lines and other heat sources. Master Cylinder Priming 1. Fill the master cylinder with brake fluid. Use a DOT 3, DOT 4 or other non-silicone based fluid.
PAGE 3
Maintenance A few basic procedures will help to ensure that your hydraulic release assembly will provide a long and dependable life. 1. Spin the bearing race and check how it feels. If it has a higher than normal resistance or feels rough, replace the bearing. 2. The piston can be removed and replaced without breaking the hydraulic seal or requiring bleeding. Periodically, remove the piston and check for any scores in the bore or on the piston surface.
PAGE 4
Tilton Engineering, Inc. 25 Easy Street • PO Box 1787 • Buellton, CA 93427 • www.tiltonracing.com A B C D 1.75 BASE I.D. O 1.500 1.498 .06 X 45v CHAMFER 2.46 1 4 SECTION A-A 2 3 1.79 RETRACTED HEIGHT 3 USE ONLY WITH DOT-3 OR DOT-4 BRAKE FLUID. NO INTERNAL TRAVEL LIMITER. MUST BE USED WITH CLUTCH PEDAL STOP. SEAL REBUILD KIT = 62-905. SEAL INSTALLATION TOOL = 96-002. HYDRAULIC AREA = 1.215 SQ IN. EITHER PORT MAY BE USED FOR FEED OR BLEED.