Pinpoint Test C: Excessive Noise
Manual Transaxle and Clutch
Pinpoint Tests
Pinpoint Test C: Excessive Noise
Normal Operation
The manual transaxle is controlled by a floor-mounted gearshift lever located in the floor console. Connection between the floor-mounted gearshift lever and the manual transaxle shift control lever assembly is made through 2 gearshift cables.
When the operator moves the floor-mounted gearshift lever, that movement is transmitted through 2 gearshift cables routed through the body to the transaxle. The 2 gearshift cables are attached to the transaxle at the transaxle shift control lever assembly. The transaxle shift control lever assembly transfers the movement of the gearshift cables to the shift rods and shift forks located inside the transaxle.
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 hydraulic 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:
- Internal transaxle components
- Clutch pedal
- Clutch slave cylinder
- Clutch pressure plate
- Clutch disc
PINPOINT TEST C: EXCESSIVE NOISE
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C1 TRANSAXLE NEUTRAL GEAR ROLLOVER TEST
- Start the engine and let it idle.
- NOTE: With the clutch pedal fully pressed, the input shaft should stop rotating.
- Press the clutch pedal.
- Does the noise stop when the clutch pedal is pressed?
Yes
REFER to Manual Transaxle/Transmission for transaxle concerns.
No
GO to C2.
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C2 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 1-3 mm (0.039-0.118 in)?
Yes
GO to C3.
No
ADJUST clutch pedal freeplay. REFER to Clutch Pedal Freeplay Adjustment Adjustments.
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C3 CHECK THE CLUTCH SLAVE CYLINDER
- Inspect the clutch slave cylinder for wear or loss of lubrication.
- Are there signs of wear or loss of lubrication?
Yes
INSTALL a new clutch slave cylinder. REFER to Clutch Controls Service and Repair.
No
GO to C4.
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C4 CHECK THE CLUTCH PRESSURE PLATE
- Inspect the clutch pressure plate for damage or material between the pressure plate and flywheel.
- Are there signs of damage?
Yes
INSTALL a new clutch pressure plate. REFER to Clutch Controls Removal and Replacement.
No
GO to C5.
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C5 CHECK CLUTCH PEDAL SWITCHES
- Inspect clutch pedal switches for damage or incorrect installation.
- Are there any signs of damage or incorrect installation?
Yes
REPLACE or REINSTALL clutch pedal switches as necessary.
No
REFER to Manual Transaxle/Transmission Symptom Chart - Transaxle for transaxle concerns.
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