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(Post Link) post #1 of 3 Old 07-04-13 Thread Starter
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Suffering from knocking from the front so got the front end on axle stands but couldn't see any movement at the obvious places...its really annoying but only happens when in a straight line, when I'm turning it doesn't happen....any thoughts?
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Front suspension 101

1. Creaking when going over uneven road surfaces, braking and acceleration = Upper wishbone bushes need removing and greasing with red rubber grease.

2. Metallic rattle and knock from suspension on uneven road surfaces = Upper arm ball joint warn. Can be checked by simply pulling and pushing the top of the tyre while having a hand on the ball joint and play will be very apparent.

3. Groaning and squeak from suspension on turning more than one full turn on the steering wheel= Top rubber turret mounts and top suspension bearings worn... Replace them.

4. Knock and thud followed by wandering handling and a lot of torque steer under heavy acceleration on a straight section of road like a normal drive in a Vauxhall! an Alfa doesn't do it! = Bottom wishbone arm bushes worn... Replace arms as a pair and then get the front wheel alignment checked/ adjusted.

5. Metallic knock and thud from a defined side and the same wayward handling as described above and also under braking... = Lower wishbone ball joint worn.
Can be checked by lifting the car on jack and axle stands placing a pry bar under the bottom of the tyre and trying to move the tyre out towards you, play and a click will be apparent, also check front tyres for signs of uneven wear. Replace wishbones as per number 4.

6. metallic rattle constantly on any road surface and worsens to a loud knock on potholes etc. = Anti roll bar drop links and/or anti roll bar inner bushes.
Remove wheels, use pry bar between drive shaft and anti roll bar ends while levering and feeling for play in the drop links... Replace them. while they are removed at both sides, firmly grab the anti roll bar and pull/ push towards and away from you...
If this offers only moderate lateral resistance, the anti roll bar inner bushes have worn and the bar itself has thinned where the bushes/ clamps have rubbed away at the paint and bar itself...
Replace the bar complete with bushes which involves dropping the front sub frame to gain access.
There you go, take your pick
If in the slightest doubt, get the entire suspension checked by a main dealer or independent specialist in one go...
Chances are they would have been changed in full sets last time so a similar time frame for failure due to wear and tear will be close is a pretty safe bet... Why waste further money in labour replacing one item at a time only to go back a few weeks later? Especially when bottom arms need to be removed at the ball joints to drop sub frames and suspension components removed to gain access to the upper wishbone bolt... Which many owners tend to do as they think they are saving money I might add....
Ergo... Full check, looking through service history and previous bills = Economic logic

Last edited by Grahameo; 07-04-13 at 20:21.
(Post Link) post #3 of 3 Old 07-04-13 Thread Starter
Status: -
AO Member
Join Date: Dec 2012
Location: United Kingdom
County: Rutland
Posts: 157

Member car:

GT 1.9 JTD

Thanks for that comprehensive reply....I'll do it next weekend...cheers
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