mark wrote:
Hi,

You should understand how to test things 'cause you can replace nearly
everything and still miss the fault.

1. I guess the suspension on the 900 1989 is the same as that of the
1983 and 1979 models I had. As it has already been mentioned you have
to unload the suspension (mentioned previously) ... basically with the
car on the ground you must jam up the upper wishbone (follow the
procedure for removing drive shafts and similar or post to explain what
it is). At that point both upper and lower ball joints will be without
load.

2. Next test. If you can suspend the front of the car you can pull the
wheels in/out as if you are testing for toe in/out. On my last 900
there was enough movement to foul up the aligning tool at the tyre place
(and that was with the wheels on the ramp). Further checking showed a
marginal movement of the steering knuckle (ball joint at the end of the
steering rod). It was safe no problem but that one millimeter of
movement was enough to produce too much wear on the tyres.

3. the above test (or similar) should show you if the truck rods move
in/out of the steering rack ... which is what you asked for.

4. Worn wheel bearings can cause excessive play but you should be able
to hear them. Loose wheel bearings can cause excessive play.

5. The wishbones themselves (where they pivot) could have play.

And all the other things already mentioned.

Regards
Charles




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