23 · Diagnostics

Front suspension noise (knock)

Make: Fiat
Model: Panda Factory Service Manual
Year: 2003–2012
Section: Noisy'' / vibrations › Front suspension noise (knock)

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Fault diagnosisFront suspension noise (knock)

FRONT SUSPENSION NOISE (KNOCK)

ABS

Whilst driving, especially on unmade roads, knocking can be heard coming from the front suspension. This fault 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.

2	CHECK ON CONSTANT VELOCITY JOINT EFFICIENCY	All OK	Problems encountered	Operation
	Try and move the driveshaft and check that there is not excessive clearance for the constant velocity joints.	Move on to Step 3	Gearbox side constant velocity joint chamber broken Wheel side constant velocity joint chamber broken Wheel side joint worn	Replace the constant velocity joint Op. 2710A24 DIFFERENTIAL END CONSTANT VELOCITY JOINT (ONE) L/H OR R/H - R + R WITH DRIVE SHAFT REMOVED - INCLUDES BOOT REPLACEMENT Replace the constant velocity joint Op. 2710A20 WHEEL END CONSTANT VELOCITY JOINT (ONE), L/H OR R/H - R + R WITH DRIVE SHAFT REMOVED - INCLUDES BOOT REPLACEMENT Replace the constant velocity joint Op. 2710A20 WHEEL END CONSTANT VELOCITY JOINT (ONE), L/H OR R/H - R + R WITH DRIVE SHAFT REMOVED - INCLUDES BOOT REPLACEMENT
3	WHEEL SIDE BOOTS AND WHEEL BEARINGS CHECK	All OK	Problems encountered	Operation
	Check the condition of the wheel side boot. If it is not intact, check that there are no leaks or no grease in the actual boot. If everything is okay and the noise was more pronounced whilst steering, check the wheel bearings.	Move on to Step 4	Boot broken Grease leaks/No grease Wheel bearing faulty	Replace the boot Op. 2710A20 WHEEL END CONSTANT VELOCITY JOINT (ONE), L/H OR R/H - R + R WITH DRIVE SHAFT REMOVED - INCLUDES BOOT REPLACEMENT Renew the correct amount of grease of the appropriate type Op. 2710A20 WHEEL END CONSTANT VELOCITY JOINT (ONE), L/H OR R/H - R + R WITH DRIVE SHAFT REMOVED - INCLUDES BOOT REPLACEMENT Replace the wheel bearing on the side where the fault occurred Op. 4450C32 ONE FRONT WHEEL HUB BEARING, LH OR RH - REPLACE, orientandolo con la pista magnetica verso l'esterno vettura This bearing is used by the ABS active sensors to calculate the wheel speed. It should NEVER come into contact with metal shavings because they could alter the gap and prevent a correct reading from the sensor
4	DIFFERENTIAL SIDE BOOT CHECK	All OK	Problems encountered	Operation
	Check the condition of the differential side boot and move the driveshaft and check that there is not excessive clearance for the constant velocity joints. If it is not intact, check that there are no leaks or no grease in the actual boot.	Move on to Step 5	Boot broken Grease leaks/No grease	Replace the boot Op. 2710A24 DIFFERENTIAL END CONSTANT VELOCITY JOINT (ONE) L/H OR R/H - R + R WITH DRIVE SHAFT REMOVED - INCLUDES BOOT REPLACEMENT Renew the correct amount of grease of the appropriate type Op. 2710A24 DIFFERENTIAL END CONSTANT VELOCITY JOINT (ONE) L/H OR R/H - R + R WITH DRIVE SHAFT REMOVED - INCLUDES BOOT REPLACEMENT
5	WHEEL SIDE JOINT TIGHTENING CHECK	All OK	Problems encountered	Operation
	Remove the wheel Op. 4450B02 LEFT FRONT WHEEL R R Check that the constant velocity joint fastening nut is tightened and that the staking is in place.	Move on to Step 6	Nut loosening	Replace the nut, restore the torque tightening and stake
6	OIL LEAKS CHECK	All OK	Problems encountered	Operation
	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	Move on to Step 7	Leaks from other parts that are lubricated Leaks from the shock absorber stem	Search for the cause of the leak following the appropriate diagnostic procedure Replace the shock absorber Op. 4410A12 FRONT SUSPENSION DAMPER (ONE), LH OR RH - FOR MCPHERSON STRUT SYSTEM - INCLUDES DISMANTLING/RE-BUILDING OF ASSEMBLY AT BENCH R R

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Parts & tools for this job Staging For 2003 Fiat Panda

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