Clutch: Description and Operation

CLUTCH COMPONENTS

A hydraulically operated clutch mechanism is used on 60, 70 and 80 Series models with manual transmission.






The basic clutch components consist of: the disc; clutch cover; hydraulic throwout bearing; and pilot bushing (Fig. 1).

The clutch disc is a single, dry-disc unit with cushion springs in the disc hub. The clutch disc friction material is riveted to the hub.

The clutch cover is a diaphragm type unit with a one-piece diaphragm spring and multiple release fingers.

Clutch disc diameter is 266 mm (10.5 inch) on six-cylinder models and 232 mm (9.28 inch) on four-cylinder models.

CLUTCH HYDRAULIC SYSTEM






The clutch hydraulic system consists of the clutch cylinder; hydraulic throwout bearing; and the fluid lines (Fig. 2).

The clutch cylinder is mounted on the drivers side of the dash panel adjacent to the brake master cylinder. The cylinder is operated by a suspended type clutch pedal (Fig. 2).

The hydraulic throwout bearing is a unique design; It incorporates the throwout bearing and slave cylinder in a single assembly. The bearing is permanently attached to the cylinder piston. The hydraulic lines are permanently attached to the cylinder and bearing assembly and are not removable.

The slave cylinder completely encircles the transmission input shaft. In operation, piston movement causes the throwout bearing to move in a linear (straight line) direction. The cylinder is attached to the transmission front case and is mounted inside the clutch housing.

CLUTCH FLUID






Clutch system fluid level is checked at the clutch cylinder (Fig. 3). Fluid level is indicated by the MAX and MIN indicators on the cylinder reservoir Check and top off fluid level to the MAX mark. Do not allow level to fall below the MJN mark.

The only fluid recommended for use in the clutch hydraulic system is Mopar Brake Fluid, or equivalent marked SAE J-1703 or DOT 3. Do not use any any other type of fluid. Never use reclaimed brake fluid or fluid from an unsealed container. In addition, do not use fluid from a container that has been opened and allowed to stand for any length of time. Moisture in the air can be absorbed by the fluid causing dilution and loss of effectiveness.

GENERAL SERVICE INFORMATION

The hydraulic throwout bearing/slave cylinder is serviced as an assembly. It cannot be disassembled for repair. The hydraulic lines are permanently attached to the assembly. They will leak if loosened or if removal is attempted.

Nylon retaining straps are installed on the throwout bearing during manufacture. These straps must not be removed. Their purpose is to hold the cylinder piston in place during shipment and installation. It is not necessary to cut the straps. They are designed to break away the first time piston movement occurs.

The clutch cylinder can be disassembled for repair. A service kit containing a replacement plunger and seal assembly is available for overhaul purposes.

The clutch disc, cover, pilot bushing and hydraulic fluid lines are all serviced as assemblies.