3308640 - H01 VEHICLE DRIFT

Whilst driving in a straight line, the vehicle tends to drift towards the right and/or the left.If necessary, carry out a test on a straight, flat road with no cambers.Check the effective deviation from the trajectory by, very carefully, loosening your grip on the steering wheel
Results of the tests
0PRELIMINARY CHECKSAll OKProblems metOperation
Preliminarily check the type, condition and inflation pressure of the tyresCheck that the tyres are correctly fitted and that the wheels are correctly fixed Continue to Step 1 Tyre inflation pressure not correctRestore the tyre inflation pressure
Tyres unsuitable or wornReplace the tyres
Fitting tyresSwap the two front wheels
Wheel fixing not correct Tighten the wheels correctly Op.   4450B10 
1WHEEL CHECKAll OKProblems metOperation

Verify:

  • that the wheels are properly balanced
  • that the wheels rotate freely (correct fitting of brake calipers)
Continue to Step 2 Wheels not balancedBalance the wheels
Incorrect fitting of front brake calipers Restore the correct fitting or replace the brake calipers Op.   3310A30 
Incorrect fitting of rear brake calipers Restore the correct fitting or replace the brake calipers Op.   3310B36 
2FRONT WHEEL GEOMETRY CHECKAll OKProblems metOperation
Check the front wheel geometry and angles, Op.   4450A10  Continue to Step 3 Geometry not correct Replace the suspesion springs Op.   4410A10 
Angles not correctRestore, where possible, the correct angles
3CHECK REAR WHEEL GEOMETRYAll OKProblems metOperation
Check the rear wheel geometry and angles Op.   4450A40  Continue to Step 4 Geometry not correct Replace the suspesion springs Op.   4420A10 
Angles not correctRestore, where possible, the correct angles
4UNDERBODY CHECKAll OKProblems metOperation
Visually inspect the underbodyCheck that there are no accidental blows, dents or bent suspension arms Continue to Step 5 Damage, in particular to the front suspensionRestore or replace the damaged components
5WHEEL BEARING CHECKAll OKProblems metOperation
Check the condition and operation of the wheel hub bearings Continue to Step 6 Front wheel bearing worn or damaged Replace the wheel hub bearing Op.   4450C32 
Rear wheel bearing worn or damaged Replace the wheel hub bearing Op.   4450D14 
6FLEXIBLE MOUNTINGS AND BUSHES, FRONT AREA, CHECKAll OKProblems metOperation

Check the condition of the bushes and mountings. In order:

  • steering box rods
  • flexible supports for front selector forks and track control arms
  • anti-roll bar flexible mountings
Continue to Step 7 Steering box rods worn or damaged Replace the steering box Op.   4130A10 
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.   4410C12 
7ENGINE SUPPORT CHECKAll OKProblems metOperation
Check the condition of the engine supports and reaction rod Continue to Step 8 Engine supports faultyLoosen the fixings: loosen the bolts, centre them in their housings and tighten them to the recommended torque (see Assembly 1008A)
Reaction rod faultyBed in the fixings: loosen the bolts, centre them in their housings and tighten them to the recommended torque (see Assembly 1008C)
8DIFFERENTIAL CHECKAll OKProblems metOperation
Check the condition of the differential: in particular make sure that there are no clearances Continue to Step 9 Differential operation faultyOverhaul or replace the differential (see OVERHAULING GEARBOXES Assembly 2110D)
9HECK ON CORRECT OPERATIONAll OKProblems metOperation
Check that the fault is no longer presentEnd of diagnosisFault persistsSearch for the fault starting from another symptom'