Pinpoint Test E: Clutch-Related Vibrations

Manual Transaxle and Clutch







Pinpoint Tests

Pinpoint Test E: Clutch-Related Vibrations

Normal Operation

Clutch pedal movement is transmitted by fluid pressure to the slave cylinder, which in turn presses the release bearing against the clutch diaphragm spring. This force causes the spring to pull the pressure plate away from the clutch disc.

This pinpoint test is intended to diagnose the following:
- Engine component
- Accessory drive component
- Clutch slave cylinder
- Flywheel
- Pressure plate



PINPOINT TEST E: CLUTCH-RELATED VIBRATIONS

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E1 CHECK FOR ENGINE COMPONENT GROUNDING


- With the vehicle in NEUTRAL, position it on a hoist. Refer to Maintenance/Service and Repair.
- Check the engine mount interlocks for grounding.
- Check for the exhaust manifold or other engine components grounding on the body or frame.
- Is there evidence of grounding on the body or frame?

Yes
REPAIR any components as necessary.

No
GO to E2.

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E2 CHECK FOR ACCESSORY DRIVE VIBRATIONS


- Remove the accessory drive belt and check for vibration.
- Does the vibration stop when the accessory drive belts are removed from the engine?

Yes
REFER to Drive Belts, Mounts, Brackets and Accessories to diagnose the accessory drive belt components.

No
GO to E3.

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E3 CHECK FOR RELEASE BEARING NOISE


- Start the engine.
- Press and hold the clutch pedal.
- Is a whirring, grating or grinding noise present only when the pedal is pushed?

Yes
INSTALL a new clutch slave cylinder.

No
GO to E4.

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E4 INSPECT THE FLYWHEEL


- Remove the transaxle.
- Inspect for loose flywheel bolts.
- Check for an excessively burnt or severely cracked contact surface.
- Inspect the flywheel runout. Refer to Flywheel Runout Check Flywheel Runout Check.
- Is the flywheel OK?

Yes
GO to E5.

No
TIGHTEN or INSTALL a new flywheel.

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E5 CHECK FOR PRESSURE PLATE IMBALANCE


- NOTICE: Failure to support the engine correctly could result in damage to the vehicle.
- Support the engine securely.
- Operate the engine with the transaxle removed.
- Is the vibration still present?

Yes
REFER to Vehicle/Testing and Inspection to diagnose the engine vibration concern.

No
INSTALL a new clutch pressure plate.

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