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 THE FLUID LEVEL


- Ignition OFF.
- Inspect the fluid level in the brake master cylinder reservoir.
- Is the fluid level within the MAX and MIN level marks?

Yes
GO to C2.

No
ADD brake fluid and CHECK for leaks in the clutch and brake systems.

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C2 CHECK CLUTCH PEDAL HEIGHT


- Measure the distance from the upper surface of the clutch pedal to the floor.
- Is the clutch pedal height 210-216 mm (8.27-8.50 in)?

Yes
GO to C3.

No
ADJUST the clutch pedal height. REFER to Clutch Pedal Freeplay Adjustment Adjustments.

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C3 CHECK THE CLUTCH PEDAL FREE PLAY


- Press the clutch pedal lightly by hand.
- Measure the distance the clutch pedal travels.
- Is the clutch pedal travel within 5-13 mm (0.20-0.51 in)?

Yes
GO to C4.

No
BLEED the clutch. REFER to Clutch System Bleeding Service and Repair.

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C4 CHECK THE CLUTCH PRESSURE PLATE AND THE DIAPHRAGM SPRING


- Remove the transaxle.
- Inspect the clutch pressure plate for wear and the diaphragm spring for even diaphragm height. Refer to Clutch Pressure Plate Check Procedures.
- Are there any signs of contamination or wear to the clutch pressure plate or diaphragm spring?

Yes
INSTALL a new clutch pressure plate.

No
INSPECT the clutch disc for damage or excessive runout. REFER to Clutch Disc Check Procedures.

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