23 · Diagnostics

Forecarriage transverse vibrations

Make: Alfa Romeo
Model: 159 Factory Service Manual
Year: 2005–2011
Section: Noise / vibrations › Forecarriage transverse vibrations

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Fault diagnosisForecarriage transverse vibrations

FORECARRIAGE TRANSVERSE VIBRATIONS

Whilst driving, especially on unmade roads, there are transverse vibrations at the front section.

This diagnosis can only be made after

See table S015 NOISE WHILST DRIVING

Carry out the latter first.

0	PRELIMINARY CHECKS	All OK	Problems encountered	Operation
	Having carried out the road test, during the See table S015 NOISE WHILST DRIVING there is transverse vibration in the front section. Continue depending on when the vibration is present.	End of diagnosis	The vibration is noticeable during take off and release.	Move on to Step 5
			The vibration is accompanied by noise which increases with speed.	Move on to Step 2
			The vibration is accompanied by noise over unmade roads.	Move on to Step 1
1	WHEEL SIDE CONSTANT VELOCITY JOINT CHECK	All OK	Problems encountered	Operation
	Raise the vehicle on a two column lift and check: - that the driveshaft-wheel side joint matching is correct; - that the seal is present.	Move on to Step 2	Incorrect matching.	Replace the constant velocity joint and the driveshaft Op. 2710A10 DRIVESHAFT WITH JOINTS (ONE), L/H OR R/H - R + R
		Move on to Step 2	Sealing ring missing.	Replace the constant velocity joint and the driveshaft Op. 2710A10 DRIVESHAFT WITH JOINTS (ONE), L/H OR R/H - R + R
2	INTERMEDIATE SHAFT BEARING CHECK	All OK	Problems encountered	Operation
	Check the condition of the intermediate shaft bearing.	Move on to Step 3	Bearing damaged	Replace the bearing Op. 2710A35 INTERMEDIATE DRIVESHAFT BEARING SUPPORT - R.R
3	WHEEL SIDE JOINT CLEARANCE CHECK	All OK	Problems encountered	Operation
	Check that the clearance for the wheel side constant velocity joint is not too great.	Move on to Step 4	Excessive clearance compared with the opposite wheel side joint.	Replace the wheel side constant velocity joint Op. 2710A20 WHEEL SIDE CONSTANT VELOCITY JOINT (ONE), L/H OR R/H - R + R WITH DRIVESHAFT REMOVED - INCLUDES BOOT REPLACEMENT and carry out the correct greasing.
4	WHEEL SIDE JOINT SEIZING CHECK	All OK	Problems encountered	Operation
	Rotate the wheel by hand and check that there is no seizing of the wheel side constant velocity joint.	Move on to Step 5	There is seizing of the wheel side joint.	Replace the wheel side constant velocity joint Op. 2710A20 WHEEL SIDE CONSTANT VELOCITY JOINT (ONE), L/H OR R/H - R + R WITH DRIVESHAFT REMOVED - INCLUDES BOOT REPLACEMENT and carry out the correct greasing.
5	WHEEL SIDE JOINT TIGHTENING CHECK	All OK	Problems encountered	Operation
	Remove the left wheel Op. 4450B02 LEFT FRONT WHEEL - R.R and/or the right one Op. 4450B04 RIGHT 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 Op. 4450C28 FRONT WHEEL HUB,LEFT OR RIGHT - R.R WITH WHEEL REMOVED, CHECK WHEEL GEOMETRY SEPARATELY
6	CLUTCH PLATE CHECK	All OK	Problems encountered	Operation
	Check that there is no irregular wear on the surface of the clutch plate.	Move on to Step 7	Surface of the clutch plate worn unevenly.	Replace the clutch plate Op. 1810A20 CLUTCH - R + R
7	CHECK ON CORRECT OPERATION	All OK	Problems encountered	Operation
	Check that the fault is no longer present.	End of diagnosis	The fault persists	The fault is due to another system (engine, gearbox, differential, suspension). Search for the cause in one of these systems, following the appropriate diagnostic procedures.

‹ Prev Front suspension noise (knocking)Next › Gearbox noise - at take off

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