Initial Inspection and Diagnostic Overview
INSPECTION AND VERIFICATION - CLUTCH1. Verify the customer concern by operating the system.
2. Visually inspect for obvious signs of mechanical damage.
3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
4. If the concern is not visually evident, verify the symptom and refer to the Symptom Chart. [1][2]Symptom Chart-General Concerns
The clutch is a single plate, dry-friction disc with a diaphragm-style spring clutch pressure plate. The clutch disc has a hub, which is splined to the input shaft. The clutch disc has friction material where it contacts the flywheel and the pressure plate. The clutch pressure plate applies pressure to the clutch disc, holding it tightly against the surface of the flywheel.
In the engaged position, the diaphragm spring holds the clutch pressure plate against the clutch disc so that engine torque is transmitted to the input shaft. When the clutch pedal is depressed, the clutch release hub and bearing pushes the diaphragm spring center toward the flywheel. The diaphragm spring pivots at the fulcrum, relieving the load on the clutch pressure plate. Steel spring straps riveted to the clutch pressure plate cover pull the clutch pressure plate from the clutch disc, disengaging the engine torque from the transmission and enabling the gears to be changed.
INSPECTION AND VERIFICATION - MANUAL TRANSMISSION
The following checks should be carried out before repairing or installing a new transmission:
Transmission Noise
If transmission noises are reported, check the transmission fluid level. If damage has occurred due to a lack of fluid, install a new transmission.
Oil Leakage
^ Check that the leaking fluid is actually transmission fluid and not hydraulic fluid (from the hydraulically operated clutch) or engine oil.
^ Check the transmission fluid level and, as necessary, drain off any excess fluid.
^ Clean the transmission and the adjacent areas carefully before the road test.