Clutch - Slippage

84ford21

Article No. 84-1-14


CLUTCH - SLIPS - (6.9L/7.5L)


LIGHT TRUCKS 1983 F250 HD/350

Clutch slippage may be caused by the hydraulic release system not permitting the pressure plate to fully engage against the clutch disc. If "bleed port" on the master cylinder is covered by the piston when the pedal is fully up, the slave cylinder is prevented from retracting. The following procedure provides inspection and, if necessary, service procedures for this condition.

Prior to disassembly of the hydraulic clutch actuating components, perform the following:

Figure 17:

1. Raise the vehicle up on a hoist and from underneath the vehicle, place palm of hand behind the (7515) clutch release lever, (extends from clutch housing) and slowly push forward (towards front of vehicle, with approximately 25 lbs. of force). If the release lever can be pushed forward, the system is functioning properly and no service is required to the hydraulic clutch system. (The forward movement of the lever indicates the bleed port of the master cylinder is uncovered.) Movement will be approximately 1/2 inch. If the release lever cannot be pushed forward, service as noted below (Refer to Figure 17, View V):

Figure 17:

Figure 18:

2. Lower the vehicle to the floor and from inside the cab, remove the spring clip attaching the master cylinder push rod to the clutch pedal lever (7A554) and remove the push rod from the master cylinder. (Figures 17 and 18).

3. Install a new adjustable master cylinder push rod assembly, part number E3TZ-7641-A, to the master cylinder. Attach the (7641) push rod assembly to the clutch (7A554) pedal lever. Secure with spring clip.
4. Adjust push rod per instructions on tag attached to push rod as follows:

INSTALLATION/ADJUSTMENT

a. Adjust push rod until freeplay between push rod and master cylinder piston is eliminated.
b. Back off one-half turn.
c. Tighten jam nut.
d. With slave cylinder mounted on clutch housing, push release lever (7515) forward to assure the slave cylinder push rod can be depressed.

e. If the slave cylinder push rod cannot be depressed, shorten master cylinder push rod.

5. If release lever can be pushed forward per the above evaluation and clutch slippage still exists, refer to the 1983 Light Truck Shop Manual, Sections 16-01/16-04 for further problem diagnosis.

PART NUMBER PART NAME CLASS

E3TZ-7641-A Clutch Push Rod-Adjustable C


OTHER APPLICABLE ARTICLES: None
WARRANTY STATUS: Reimbursable within the provisions of the Warranty and Policy Manual.
OPERATION:
TIME: "Actual Time" as defined in the Warranty and Policy Manual. DLR. CODING: Basic Part No. 7641 Code: 89