Noisy Operation
Transmission noise is most often a result of :
- Worn or damaged internal components.
- Chipped, broken gear or synchronizer teeth, and brinnelled, spalled bearings.
- Insufficient lubricant.
- Aftermarket additives can damage synchronizers.
NOISE WHEN LAUNCHING
- While operating the vehicle, a noise that varies in intensity with engine speed is heard when releasing the clutch after a shift.
CHECK DIFFERENTIAL EVERYTHING OK PROBLEMS ENCOUNTERED RESOLUTION Inspect the differential gears for wear, damage or excessive clearance. Confirm that the ring gear bolts are tight. Continue to Step 2 Worn or damaged differential components Repair or replace components as necessary. CHECK DIFFERENTIAL HOUSING EVERYTHING OK PROBLEMS ENCOUNTERED RESOLUTION Check for wear of the planet pinion gear shaft or the bore of the differential housing. Refer to DIFFERENTIAL, TRANSAXLE, DISASSEMBLY AND ASSEMBLY . End diagnosis Worn differential housing Replace the differential housing. Refer to DIFFERENTIAL, TRANSAXLE, DISASSEMBLY AND ASSEMBLY .
NOISE IN NEUTRAL
- With the vehicle stationary, transmission in neutral, engine running, there is a noise at high frequency and low intensity in the transmission area.
PRELIMINARY CHECKS EVERYTHING OK PROBLEMS ENCOUNTERED RESOLUTION 1. Visually check if the noise is accompanied by an oil leak from the gearbox / differential.
2. Depress the clutch pedal and see if the noise increases.
3. Check the oil level in the gearbox / differential.Continue to Step 2 1. Oil leak from the gearbox
2. Clutch depressed the noise disappears or diminishes: internal transmission noise.
3. Oil level too low.1. Repair leak and fill transmission to proper fluid level.
2. Remove transmission and replace damaged components.
3. Correct the transmission oil level and perform a road test. Refer to FLUID, STANDARD PROCEDURE .
If the fault persists, go to Step 2.CHECK CLUTCH DISC SPLINES EVERYTHING OK PROBLEMS ENCOUNTERED RESOLUTION Check for the presence of excess lubricant in the splines of the clutch disc and transmission input shaft. Continue to Step 3 1. Worn or damaged input shaft splines.
2. Worn or damaged splines in the clutch disc.1. Replace the transmission input shaft.
2. Properly lubricate the bushings clutch disc splines. If necessary, replace the clutch disc. Refer to DISC, CLUTCH, REMOVAL AND INSTALLATION .CHECK CLUTCH DISC EVERYTHING OK PROBLEMS ENCOUNTERED RESOLUTION Inspect:
wear of the clutch disc;
contamination (oil or grease) of the clutch disc;
deformation of the clutch disc;
damage to the diaphragm spring pressure plate.End diagnosis 1. Worn or damaged clutch disc or pressure plate.
2. Presence of oil or grease.1. Replace the clutch disc. Refer to DISC, CLUTCH, REMOVAL AND INSTALLATION .
2. Also, replace the transmission input shaft seal.
NOISE IN A SPECIFIC GEAR
- While driving, a noise is heard in a specific gear from the transmission area. The noise abates when shifted to a different gear.
CHECK THE SYNCHRONIZERS EVERYTHING OK PROBLEMS ENCOUNTERED RESOLUTION Remove and Disassemble transmission to inspect the appropriate synchronizer(s). Continue to Step 2 Worn or damaged synchronizer components Replace worn components as necessary. CHECK THE GEARS EVERYTHING OK PROBLEMS ENCOUNTERED RESOLUTION Remove and Disassemble transmission to inspect the appropriate gear(s) Continue to Step 3 1. Worn or damaged gears 1. Replace the gears as necessary. CHECK THE DIFFERENTIAL EVERYTHING OK PROBLEMS ENCOUNTERED RESOLUTION Inspect the differential gears.
In particular:
should not be worn or damaged.
must not have an excessive clearance.End diagnosis Worn or damaged differential components. Repair or replace as necessary.
NOISE WHILE TURNING
- While cornering, a noise is heard from the transmission area.
PRELIMINARY CHECKS EVERYTHING OK PROBLEMS ENCOUNTERED RESOLUTION 1. Steer to the right or to the left and see if the noise increases.
2. Steer to the bottom and then release the steering wheel: make sure that the noise intensity increases or not with the steering angle.Continue to Step 2 1. Noise level varies only by steering to the right or left.
2. Noise ceases while steering is centered and vehicle is moving in a straight line.
3. Noise level varies greatly with the steering angle.
4. Noise remains constant with the steering angle.1. Continue to Step 2, CHECK DIFFERENTIAL.
2. Continue to Step 2, CHECK DIFFERENTIAL
3. Continue to Step 3, CHECK CV JOINTS
4. Continue to Step 2, CHECK DIFFERENTIAL.CHECK DIFFERENTIAL EVERYTHING OK PROBLEMS ENCOUNTERED RESOLUTION Check the differential, in particular the differential bearings. Continue to Step 3 1. Bearings damaged
2. Gears worn or damaged.1. Replace bearings
2. Repair or replace the differential case as necessary. Refer to DIFFERENTIAL, TRANSAXLE, DISASSEMBLY AND ASSEMBLY .CHECK CV JOINTS EVERYTHING OK PROBLEMS ENCOUNTERED RESOLUTION Check the CV joints. End diagnosis Damaged joint Replace the joint.