S16 FRONT SUSPENSION NOISE (CREAK/SQUEAK) - Lancia - MUSA - eLearn

184000581 - S16 FRONT SUSPENSION NOISE (CREAK/SQUEAK)

Whilst driving, especially on unmade roads, there is creaking coming from the front suspension. This diagnosis can only be made after See table S15 VEHICLE RUNNING NOISE . Carry out the latter first.

If the problem is only on one side, carry out the checks and any operations on the appropriate side only.

Results of the tests

PRELIMINARY CHECKS

All OK

Problems encountered

Operation

Having carried out the road test, see the Table S15 RUMOROSITA' in condizioni di marcia , there was a creaking noise from the front.Continue depending on the circumstances in which the noise occurs

End of diagnosis

The noise is noticeable during steering, even with the vehicle stationary

Move on to Step 1 1

The noise is noticeable during steering, even with the vehicle stationary

Move on to Step 2 1

MC PHERSON MOVING ELEMENTS CHECK

All OK

Problems encountered

Operation

Check that the noise is not caused by the movement of the shock absorber buffer plate (visible from the engine compartment side)

End of diagnosis

The buffer plate is loose

Tighten the upper nut to torque so that the buffer plate does not move any more

There is contact between the rubber part of the plate and the bodyshell

Place a shim no larger than 2 mm in between

DUST COVER CHECK

All OK

Problems encountered

Operation

Check that the dust cover is not rubbing against the shock absorber casing, by moving it and applying pressure and releasing it above the shock absorber casing

Move on to Step 3 1

There is rubbing

Replace the end of travel buffer

END OF TRAVEL BUFFER CHECK

All OK

Problems encountered

Operation

Check that the end of travel buffer is correctly inserted in its housing by carrying out the Test 4410AA

Move on to Step 4 1

End of travel buffer not correctly inserted

Refit the buffer correctly

CHECKS IN THE ENGINE COMPARTMENT

All OK

Problems encountered

Operation

Check that there are no pipes, cables or shields that could cause interference when the engine moves

Move on to Step 5 1

Components incorrectly positioned

Reposition the components correctly

CHECKS UNDER THE FLOOR

All OK

Problems encountered

Operation

Position the vehicle on a two column lift and raise it.Check that there are no pipes or heat shields under the floor that are producing noise

Move on to Step 6 1

Pipes or heat shields incorrectly fastened

Renew the correct fastening

THRUST BUSHES CHECK

All OK

Problems encountered

Operation

Check that there are no signs of rubbing between the bushes and their seats

Move on to Step 7 1

Signs of rubbing detected

Lubricate the elements with silicon grease

The use of unsuitable lubricants can adversely affect the operation of the component

ANTI-ROLL BAR CHECKS

All OK

Problems encountered

Operation

Check that there are no faults with the anti-roll bar See Test 4410CA Verifiche sulla barra stabilizzatrice

More specifically:

Anti-roll bar correctly positioned in relation to the centre-line of the vehicle
Paint not worn at the points where the bar and the track control arms come into contact
Flexible mounting in the contact area with the bar intact
Fastenings between bar and chassis
Fastenings between bar and track control arms

Move on to Step 8 1

Torque tightenings not correct

Restore the correct tightness

Bar not correctly positioned

Replace the anti-roll bar Op. 4410C10

Paint worn at the contact points (rubbing between bar and crossmember and bar and track control arm)

Replace the anti-roll bar Op. 4410C10

Signs of tearing or damage to the flexible mountings in the centre or at the ends

Replace the anti-roll bar Op. 4410C10

SPRING/SHOCK ABSORBER ASSEMBLY CHECK

All OK

Problems encountered

Operation

Check that the mountings fastening the suspension to the bodyshell (at the shock absorber turrets) do not show signs of wear on account of rubbing.The shock absorber must be removed for this check Op. 4410A12 Check the condition of the lower spring seal.Also check that the positioning and the fitting of the semi-corner assembly (spring-shock absorber assembly) is correct.Check that there are no signs of rubbing on the suspension spring at its supports.Also check that the spring shows no signs of wear

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

End of diagnosis

Positioning or fitting of semi-corner assembly not correct

Restore the correct fitting/positioning of the components

Signs of tearing on the rubberized plate

Replace the components making sure that they are correctly position (spring in contact with the lower plate projection)

Spring worn

Replace the shock absorber spring Op. 4410A12

Signs of rubbing between the spring and its supports (lower seal or upper seal). Check the condition of the paint on the top part of the plate.

Only replace the shock absorber if there is obvious abrasion

The spring-shock absorber assembly should be correctly fitted by positioning the mounting paralle to the brake disc and the tab should be positioned in the opposite direction to the direction of travel of the vehicle.