3308729 - S46 NOISE' FRONT / AT TAKE-OFF

With the engine running, in the case of brisk acceleration / variations in torque, there is a noise (banging) in the area of the gearbox / transmission
Results of the tests
0PRELIMINARY CHECKSAll OKProblems metOperation
Preliminarily check that the wheels are correctly fixed Continue to Step 1 Fastening not correct Tighten the wheels correctly Op.   4450B10 
1SPRING/SHOCK ABSORBER ASSEMBLY CHECKAll OKProblems metOperation
Check the spring/shock absorber assembly.

In particular, ascertain:

  • the spring/shock absorber assembly fixings are correct
  • there is no contact between the first spring coil and the end of the spring
Continue to Step 2 Fastenings not correct Restore the fixings for the spring/shock absorber assembly Op.   4410A10 
Spring/shock absorber assembly damaged Replace the spring/shock absorber assembly Op.   4410A10 
2FRONT SUSPENSION BUSHES AND FLEXIBLE MOUNTINGS CHECKAll OKProblems metOperation
Check the condition of the bushes and mountings.

In order:

  • flexible supports for front selector forks and track control arms
  • anti-roll bar flexible mountings
Continue to Step 3 Arm supports worn or damagedReplace the supports (see Assembly 4410B)
Selector fork supports worn or damagedReplace the supports (see Assembly 4410A)
Anti-roll bar mountings worn or damaged Replace the mountings Op.   4410C10 
3STEERING TIE-RODS AND ARMS CHECKAll OKProblems metOperation
Check the condition of the steering tie-rods and arms. Continue to Step 4 Rods or arms damaged or worn Replace the steering box Op.   4130A10 
4CONSTANT VELOCITY JOINTS CHECKAll OKProblems metOperation
Check the transmission constant velocity joints Continue to Step 5 Joint damaged Replace the joint Op.   2710A20 
5SUSPENSION FIXINGS CHECKAll OKProblems metOperation
Check that the suspension is correctly fixed to the bodyshell, through the front crossmember Continue to Step 6 Fastenings not correctRestore the frame fixings
6HECK ON CORRECT OPERATIONAll OKProblems metOperation
Check that the fault is no longer presentEnd of diagnosisFault persistsSearch for the fault starting from another symptom'