3233165 - S40 NOISE' FRONT / DRIVING IN A STRAIGHT LINE ON AN EVEN ROAD

With the vehicle moving along a straight, even road, there is a noise from the front, often accompanied by vibrations.As the speed of the vehicle increases, so too does the noise
Results of the tests
0PRELIMINARY CHECKSAll OKProblems metOperation
Preliminarily, check the type, condition and inflation pressure of the tyres Continue to Step 1 Pressure not correctRestore the tyre inflation pressures
Tyres not suitable or wornReplace the tyres
1WHEEL BEARINGS CHECKAll OKProblems metOperation
Carry out a test, gradually steering to the right or the left; check whether the intensity of the noise increasesThe noise remains constant: Continue to Step 2 The noise increases greatly with the steering angle: bearing worn or damaged Replace the wheel hub bearing Op.   4450C32 
2INTERMEDIATE SHAFT CHECKAll OKProblems metOperation
Especially if the fault is accompanied by vibrations

Check:

  • the operation of the intermediate shaft bearing
  • the condition of the intermediate shaft
Continue to Step 3 Intermediate shaft worn or distorted Replace the intermediate shaft Op.   2710A31 
Intermediate shaft bearing worn Replace the intermediate shaft bearing Op. 3710A32
3WHEEL CHECKAll OKProblems metOperation

Check:

  • that the wheels are properly balanced
  • the condition of the wheel rims
Continue to Step 4 Wheels not balancedBalance the wheels
Wheel rims dented or distortedReplace the wheel rims
4CHECK CORRECT OPERATIONAll OKProblems metOperation
Check that the fault is no longer presentEnd of diagnosisFault persistsSearch for the fault starting from another symptom'