Having carried out the road test, see the Table

S15 RUMOROSITA'' in condizioni di marcia

there was a knocking noise from the front.

Continue depending on the circumstances in which the noise occurs

Raise the vehicle on a two column lift and check that there are no oil leaks from the shock absorber stem

Slight dampness on the stem is considered normal because there is evaporation during the operation of the shock absorber.

If there is a persistent oil leak on the shock absorber stem, make sure that it is not coming from other parts of the vehicle that are lubricated

Replace the shock absorber

Op. 4410A12 FRONT SUSPENSION DAMPER (ONE), LH OR RH - FOR MCPHERSON STRUT SYSTEM - INCLUDES DISMANTLING/REASSEMBLY OF ASSEMBLY AT BENCH - R.R

Check that there are no signs of interference between the suspension elements or between the latter and the bodyshell.

Check that there are no signs of interference between the lower end of the shock absorber bar connecting rod and the front fastening for the crossmember.

Also check that there are no signs of interference between the lower track control arm and the lower fork.

In particular, check that there are no signs of wear on the suspension springs and that they do not show signs of abrasion.

If the spring shows signs of abrasion, its mechanical properties could be weakened as a result of oxidation

Replace the spring

Op. 4410A12 FRONT SUSPENSION DAMPER (ONE), LH OR RH - FOR MCPHERSON STRUT SYSTEM - INCLUDES DISMANTLING/REASSEMBLY OF ASSEMBLY AT BENCH - R.R

taking care to fit it correctly

Locate the area of the possible noise source: top or bottom.

Starting from the area where the knocking was identified, check See Test

See Test 4410OA CHECKING CORRECT TIGHTENING OF FRONT SUSPENSION

The tightening torques of the fixing bolts for:

• upper shock absorber fastening to aluminium fork;
• upper shock absorber fastening to aluminium fork;
• anti-roll bar to crossmember fastening;
• fastening of lower/upper end of connecting rods for shock absorber anti-roll bar;
• inner/outer fastening for front/rear bushes for lower track control arms to crossmember;
• fastening of upper aluminium fork to bodyshell;
• fastening for upper track control arm to aluminium fork and steering knuckle;
• fastening between power assisted steering box rod and steering knuckle;
• fastening for steering box to crossmember;
• front/centre/rear fastening between crossmember and bodyshell;
• brake caliper fastening to steering knuckle;
• disc shield fastening.

Also check that the anti-slip adhesive band is present where the crossmember is attached to the bodyshell in the middle and at the back

After having disconnected the upper track rod end for the shock absorber connecting rod, check that the anti-roll bar does not rotate freely around the U-bolts securing it to the crossmember.

After having disconnected the connecting rod, check that the clearance for the joints is not too large.

Check that there is no clearance between the track control arm track rod ends and make sure that the boot is intact.

The bolt connecting the track control arm to the steering knuckle must be loosened in order to carry out this operation.

Also check the condition of the bushes.

Check that there are no glycol leaks from or signs of damage to the arm rear bush.

Check that the track rod end clearance is not too large.

In order to do so the guard under the engine must be removed

Op. 7055B64 ENGINE COMPARTMENT DUST PROTECTION IN FRONT WHEEL ARCH LINER (ONE) LEFT OR RIGHT - R.R.

and disconnect the bolt connecting it to the front steering knuckle

Op. 4410B40 LOWER TRACK CONTROL ARM (WITH BALLJOINT) FOR LEFT OR RIGHT FRONT SUSPENSION (ONE) - R+R - CHECK WHEEL GEOMETRY SEPARATELY

Also check the condition of the front bushes.

If the spring shows signs of abrasion, its mechanical properties could be weakened as a result of oxidation

Check the presence and condition of the rubber support seals for the upper/lower spring.

The shock absorber must be removed in order to carry out this operation

Op. 4410A10 L/H OR R/H FRONT SUSPENSION SPRING/DAMPER UNIT (ONE) - R+R - CHECK WHEEL GEOMETRY SEPARATELY IF NECESSARY

checking that the stem projects evenly after the application of manual compression.

Replace the shock absorber

Op. 4410A10 L/H OR R/H FRONT SUSPENSION SPRING/DAMPER UNIT (ONE) - R+R - CHECK WHEEL GEOMETRY SEPARATELY IF NECESSARY