Re: 740 GL: how much steering rod play?
"Geronimo" <firstname.lastname@example.org> wrote in message
> Re: 89 740 GL sedan:
> Once in a while the front end develops a strange shimmy/vibration. ON
> very smooth roads, going straight, even at 70 MPH, the car has no
> vibrations. But if you make a turn in the road, decelerating, and it
> is not so smooth, often this "shake" will start. It lasts only about
> 4-6 seconds or so. Bad enough to sure get your attention! Its not the
> road itself at all, it is something in the front suspension..but rough
> roads are more prone to trigger this shimmy/shake/vibration. My first
> impression was that I had a worn out tie-rod end. But I lifted the
> front end and checked. At both tie rod ends there is NO play. BUT
> both wheels can be moved back and forth about 1/4 inch, there is that
> much play in the steering for each wheel. Each steering rod goes into
> a boot, and it is the attachment at that inside end of the steering
> control rods on each side, that has the play. It seems like this is
> enough slop to cause an intmt. vibration, but I am not any expert. How
> much play is allowable before this steering assembly has to be
> replaced? Is 1/4 in. of play anything to worry about?
I think you've found the problem - there should be no detectable play
(assuming you have one wheel off the ground and the other is on the ground).
I had to replace one tie rod because of vibration on braking, and the play
was about what you describe. The boot over the rack was torn and I guess
dirt got in there and attacked the joint.
Each tie rod is close to $100 US, and that probably depends on the version.
(Mine was a Cam Gear.) There is a ZF rack and a Cam Gear rack. The ZF rack
is boldly emblazoned "ZF." IIRC the ZF tie rod is staked onto the rack with
a dog washer and is easier to remove than the Cam Gear type, which has a
flattened collar or dimpled shoulder - something like that - to stake it.
Obviously, alignment is mandatory after replacing either tie rod. By all
means, replace the boot while replacing the tie rod.
If you take it to a shop, I'd expect about $400 US for the whole shootin'