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Component Locator > < Tapered Roller Bearing Outer Races, Remove and Install (F18)

Astra G

Diagnostic help if there are complaints of noise from manual transmissions (F13/F13+/F17/F17+/F18)

Noises from the drive train giving cause for complaints do not necessarily come from the manual transmission. The following table serves to reduce complaints concerning noises from F13/F13+/F17/F17+/F18 manual transmissions.

Vehicle is Stationary with Engine Idling

Complaint:

Noise only occurs when clutch pedal is depressed

Type of noise

Additional information

Remedy

Bearing noise

Vibrations in the clutch pedal

Check clutch disc

Knocking noise

Audible noises in the lower engine speed range

Further faultfinding on the engine

Complaint:

Noise occurs both when clutch is depressed and not depressed.

Type of noise

Additional information

Remedy

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Noise comes from engine area.

Locate source of noise more precisely in engine.

Vehicle is Stationary with Engine Idling

Complaint:

Noise becomes louder when clutch pedal is depressed

Type of noise

Additional information

Remedy

-

Noise comes from engine area.

Check release bearing of the central release

Rattling

When gear engaged

Check synchronisation of the gear

Driven Vehicle

Complaint:

Noise only occurs when clutch pedal is depressed

Type of noise

Additional information

Remedy

Whining, screaming

Noise becomes louder when 1st/2nd / 3rd/4th or reverse gear is engaged and higher engine speed

Replace 1st/2nd / 3rd/4th or reverse gear and gear cluster

Noise depends on load condition when all gears are engaged:

Noise becomes quieter especially when 4th gear is engaged and is audible when all other gears are engaged

Check differential gear pair and replace if necessary

Idle speed, full load/partial load, traction/overrun

 

 

Rattling

Audible at gear shift 2-1

Check synchronisation of the 5th gear

 

Audible under acceleration from low engine speed in the respectively engaged gear

Check gear pair causing complaint for backlash and replace if necessary

Complaint:

Noise only occurs when clutch pedal is depressed

Type of noise

Additional information

Remedy

Scraping / rasping

When stationary with clutch not depressed, synchronise gears

 

Noise becomes quieter for synchronised gear

 

Check synchronisation of each synchronised gear

Noise becomes louder with gears synchronised

Check gear shift forks of the synchronised gear and groove in the sliding gear or gear shift sleeve

Replace respective gear shift fork / gear shift sleeve or sliding gear

Noise unchanged

Check reference gap between clutch splines and synchroniser ring

Replace entire end shield

 

Check tooth backlash between gear cluster and gears

 

Complaint:

The source of the noise is not identifiable by the trouble shooting measures described above

Search for / locate noises in the axle bearings, wheel bearings and axle shaft.

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Component Locator > < Tapered Roller Bearing Outer Races, Remove and Install (F18)