Date: Sat, 31 Mar 2007 00:04:20 +0100
From: "Charles C." <>
Subject: Re: '89 900 Randomly Pulls Slightly Left or Right at Highway Speed

mark wrote: > On Mar 29, 8:25 am, "john" <> wrote: >> "mark" <> wrote in message >> >> >> >>> The last time I had this happen was on my 87 9000 & it was due to a >>> worn ball joint. I jacked up the front end of the 900 & both wheels >>> felt tight so I'm wondering what else could cause the random pulling. >>> Could it be a worn steering rack? Any suggestions are greatly >>> appreciated. >>> Mark >> to test balljoints properly you need to unload the suspension. Wheels can >> 'feel tight' even if the balljoints about to pop out..... >> >> if the front end clunks badly on rough roads thats also an indication of >> worn balljoints.... > > Thanks for your input. I will replace the balljoints ASAP > 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 -- Please remove _removeme_ to reply.

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