Pinpoint Test C: Clutch Drag

Manual Transaxle and Clutch






Pinpoint Tests

Pinpoint Test C: Clutch Drag

Normal Operation

The clutch is designed to transfer the power from the engine to the transmission, which may be either stationary (starting) or rotating at a different speed (upshifting or downshifting). The clutch is functioning correctly when both the engine and transmission are rotating at the same speed with the clutch engaged. Clutch pedal movement is transmitted by fluid pressure, which actuates the clutch release hub and bearing. The clutch release hub and bearing pushes on the spring center towards the flywheel. The diaphragm spring pivots at the fulcrum, relieving the load on the clutch pressure plate. Steel spring straps riveted in the clutch pressure plate cover pull the clutch pressure plate from the clutch disc, disengaging the engine torque from the transmission.

This pinpoint test is intended to diagnose the following:
- Fluid level
- Clutch pedal free play
- Clutch pressure plate
- Clutch pedal
- Clutch disc contamination



PINPOINT TEST C: CLUTCH DRAG

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C1 CHECK CLUTCH FLUID LEVEL


- Check clutch fluid level.
- Is the clutch fluid level between the MAX and MIN marks on the brake fluid reservoir?

Yes
GO to C2.

No
FILL reservoir to specification, CHECK the brake and clutch systems for leaks. TEST clutch system for normal operation.

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C2 TEST CLUTCH PEDAL FREE TRAVEL


- Operate clutch pedal manually to the point of resistance and release.
- Measure pedal travel.
- Is the measured dimension within 10 mm (0.40 in)?

Yes
GO to C3.

No
GO to Pinpoint Test B. Pinpoint Test B: Clutch Chatter, Rattle Or Shudder

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C3 CHECK THE BELLEVILLE SPRING WASHER OF THE CLUTCH PRESSURE PLATE


- Remove transaxle.
- Does the clutch pressure plate or the Belleville spring washer of the clutch pressure plate show signs of wear or damage?

Yes
INSTALL a new clutch pressure plate. TEST the system for normal operation.

No
VERIFY the customer concerns. GO to Symptom Chart - Clutch, GO to Symptom Chart - Transaxle or GO to Symptom Chart - NVH if necessary. Symptom Chart - Clutch Symptom Chart - Transaxle Symptom Chart - NVH

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