gq underbody knocks
Submitted: Monday, Feb 16, 2004 at 11:02
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Dirt
Hi guys, just wondering if anyone has experienced underfloor thumping sounds coming from seemingly under the drivers and passengers feet in gq patrols. I have a 93 dx and the sound occurs during breaking on the tarmac and quite constantly while driving off road. A friend has a 97 dx and has the same thumping but to a lesser degree. Does anyone have any ideas and possible cures???
Reply By: chrisfrd - Monday, Feb 16, 2004 at 11:16
Monday, Feb 16, 2004 at 11:16
G'day.
Check the following
suspension components;
1. Swaybar bushes (top and bottom)
2. Swaybar lateral bushes.
3. Panhard rod journals and bushes (where the bar interfaces with the chassis under the drivers foot
well)
4. The shock-absorber mounts and bushes.
5. If you are energetic, remove the shock absorbers and
test their draw length and resistance.
There should be NO MOVEMENT by hand capable. A method I use is to jack the front of the car up using a trolley jack and "drop" (rapid decent) the car from 300mm or so. It normally shows any flaws in the bushes as you do this.
Another trick is to lift the chassis on either side to find any failures as above.
Many GQ's I've seen are now having the Panhard rod and sway bar bushes replaced, due to NVH problems. Banging is normally an excessive
suspension wear problem, so look here first.
Chris
AnswerID:
46867
Follow Up By: Dirt - Monday, Feb 16, 2004 at 11:46
Monday, Feb 16, 2004 at 11:46
thanks for the ideas chris, however i have recently upgraded
the springs and shocks and had the majority of the bushes replaced in the
suspension which greatly improved the ride and handling and reduced the squeaks and creaks but the knock still remain. I will give your 'drop'
test a go and see if it turns up something. I orginally thought it was the chassis knocking onto the body but i cant find any evidence of that at this stage
FollowupID:
308874
Follow Up By: LBJ - Monday, Feb 16, 2004 at 12:22
Monday, Feb 16, 2004 at 12:22
they also had some problems with body mounts too. just something to
check!
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308876
Follow Up By: chrisfrd - Monday, Feb 16, 2004 at 16:21
Monday, Feb 16, 2004 at 16:21
Yup. That was the next step.
Speaking of steps.. Do you have ARB sidesteps with the barwork extending to the bullbar?
I've had the bleep s with these bars as they knock the body work when the car flexes.
Also, body mounts can be loose but vibrate. It's usually fairly visable.
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308899
Reply By: Roachie - Monday, Feb 16, 2004 at 12:08
Monday, Feb 16, 2004 at 12:08
Dirt,
Have you checked the bushes on the leading arms? They are located right under the drivers/passengers footwell....ie where the arms come back from the axle tube and connect on to the chassis.
You may also be on the right track with the body/chassis connection. There is a body mounting point right near the same point I just mentioned and not much clearance, so if the rubbler body blocks have compressed a bit over the years, there maybe some intermittent contact occuring.
Cheers,
Roachie
AnswerID:
46873