3233169 - S45 NOISE' FRONT / ROUND BENDS

With the vehicle driving, there is a constant noise from the front, especially when steering
When driving in a straight line this noise disappears.
Results of the tests
0PRELIMINARY CHECKSAll OKProblems metOperation
Visually inspect the power assisted steering fluid level in the reservoirCarry out a test by steering on full lock and then releasing the steering wheel Continue to Step 1 Level too lowRestore the correct level. if there are leaks, See table   X30 
The noise increases towards the end of travel position and with the engine speed (roaring) Continue to Step 2
The noise remains constantNo intervention of any sort is needed: the noise is due to the by-pass valve discharing excess pressure
The noise is a banging when the steering wheel is in the centre Continue to Step 4
1POWER ASSISTED STEERING FLUID RESERVOIR CHECKAll OKProblems metOperation

Check:

  • reservoir breather plug
  • reservoir filter
Continue to Step 2 Breather plug blockedClean or replace the plug
Filter dirty or blocked Replace the reservoir Op.   4130B10 
2POWER ASSISTED STEERING FLUID QUALITY CHECKAll OKProblems metOperation
Visually inspect the power assisted steering fluid in the reservoir.Make sure that there is no emulsified oil (oil which is lighter in colour and with bubbles) Continue to Step 3 Emulsified fluidEliminate any air penetration through the power assisted steering system pipes (see Assembly 4310B)
3POWER ASSISTED STEERING PIPES CHECKAll OKProblems metOperation
Check whether there are any restrictions in the system pipes, flexible and rigid Continue to Step 4 Pipes faultyReplace the damaged parts, replacing all the seals (see Assembly 4310B)
4POWER ASSISTED STEERING PUMP CHECKAll OKProblems metOperation
Carry out a test rotating the steering wheel slightly firstly with the engine running and then with it switched off: check that the knocking takes place both with the engine running and with it switched off Continue to Step 5 With the engine running there is a knocking noise, with the engine switched off it disappears Replace the power assisted steering pump Op.   4130B20 
5STEERING TIE-RODS AND ARMS CHECKAll OKProblems metOperation
Check the condition of the steering tie-rods and arms. Continue to Step 6 Tie-rods damaged or worn Replace the tie-rids or balljoints Op.   4110B14 
Arms damaged or worn Replace the steering box Op.   4130A10 
6STEERING COLUMN BEARINGS CHECKAll OKProblems metOperation
Check that there is not too much play in the steering column; check the condition and the efficiency of the steering column support bearings Continue to Step 7 Bearings worn or damaged Replace the bearings involved Op.   4110A30 
7CHECK CORRECT OPERATIONAll OKProblems metOperation
Check that the fault is no longer presentEnd of diagnosisFault persistsSearch for the fault starting from another symptom'