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C635 TRANSAXLE
5
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
1. 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.
2.
CHECK
DIFFERENTIAL
HOUSING
EVERYTHING OK
PROBLEMS
ENCOUNTERED
RESOLUTION
Inspect the differential
gears for wear, damage
or excessive clearance.
Confirm that the ring
gear bolts are tight.
End diagnosis
Worn
or
damaged
differential components
Repair
or
replace
components
as
necessary.
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.
1.
PRILIMINARY
CHECKS
EVERYTHING OK
PROBLEMS
ENCOUNTERED
RESOLUTION
Visually check if the noi
se is accompanied by
an oil leak from the
gearbox / differential.
Depress the clutch
pedal and see if the
noise increases.
Check the oil level in the
gearbox /differential.
Continue to Step 2
Oil leak from the gearbox
Clutch depressed the
noise disappears or
diminishes:
internal
transmission noise.
Oil level too low.
Repair leak and fill
transmission to proper
fluid level.
Remove transmission
and replace damaged
components.
Correct the transmission
oil level and perform a
road test