Big Rattle
#1
Big Rattle
Over the past couple of months now the rattle in the rear of my car has gotten realll bad. Im assuming from what ive seen/heard/and had my mechanic friend look at is that the rear suspension is shot. He said its a shock and strut assembly, but i remember people on here saying the front is struts and the rears are shocks. So in order to fix the rear suspension. what would i need to do? Just put in new springs? Thanks guys.
#3
#4
#5
in my experience, worn suspenion makes clunks and rumbles, not rattles, and it usually means you need bushings and/or your shocks are shot. old springs may sag but I've never heard them rattle. now, maybe if something is cracked, I dunno.
here's a diagram of the rear suspension of a 740/940 non-IRS...
and another showing the spring and shock (ommited in that first)
(all numbers below refer to the parts in that first diagram)
perhaps something is cracked in/around that double diagonal brace piece (#18, 19) that supports the torque arms (#34, #31)? Or maybe you just have some really shot bushings so the torque arms, or the panhard rod (#12) is rattling. important bushings include the panhard bushings 13+14, the torque arm large bushings 33,36, and small ones 32,35. I've heard the axle 'bearings' (not actually bearings in the conventional sense) #7's can wear out and cause the axle to rattle in the control arms. The torque arm braces are mounted in bushings 24 and 21, if these were loose, it could rattle in the frame. Oh, and I guess if any of the bolts are loose/broken, that certainly could cause rattles.
I think I'd get your car up on a jack stands or a lift, and go under there with a rubber mallet and start tapping stuff, see if you can find something that rattles similar to what you're hearing.
here's a diagram of the rear suspension of a 740/940 non-IRS...
and another showing the spring and shock (ommited in that first)
(all numbers below refer to the parts in that first diagram)
perhaps something is cracked in/around that double diagonal brace piece (#18, 19) that supports the torque arms (#34, #31)? Or maybe you just have some really shot bushings so the torque arms, or the panhard rod (#12) is rattling. important bushings include the panhard bushings 13+14, the torque arm large bushings 33,36, and small ones 32,35. I've heard the axle 'bearings' (not actually bearings in the conventional sense) #7's can wear out and cause the axle to rattle in the control arms. The torque arm braces are mounted in bushings 24 and 21, if these were loose, it could rattle in the frame. Oh, and I guess if any of the bolts are loose/broken, that certainly could cause rattles.
I think I'd get your car up on a jack stands or a lift, and go under there with a rubber mallet and start tapping stuff, see if you can find something that rattles similar to what you're hearing.
#8
oh, and that spring drawing,
if the hardware that holds the shock or secures the top of the spring is loose or broken, maybe that would rattle on bumps. never happened to me, but I could see that.
To remove the spring, you unbolt the lower shock mount and jack the car off the axle, that unloads the spring completely so you can get up inside and and unbolt the top (nut 20 holding stack 19...15 and the spring comes right out.
i'm about to replace those rear springs on my 740 wagon... putting fcp groton's overload springs ('made in sweden', they say on them), and bilstein tc touring shocks, and replacing some bushings for good luck. front gets some bushings, tc struts, but stays with the stock springs.
if the hardware that holds the shock or secures the top of the spring is loose or broken, maybe that would rattle on bumps. never happened to me, but I could see that.
To remove the spring, you unbolt the lower shock mount and jack the car off the axle, that unloads the spring completely so you can get up inside and and unbolt the top (nut 20 holding stack 19...15 and the spring comes right out.
i'm about to replace those rear springs on my 740 wagon... putting fcp groton's overload springs ('made in sweden', they say on them), and bilstein tc touring shocks, and replacing some bushings for good luck. front gets some bushings, tc struts, but stays with the stock springs.
#9
#11
I've got the same problem on my daughter's 940 sedan?
Hi- I'm brand new to this forum and have a very similar problem.
My daughter's '95 940 sedan only has 115m miles on it. I replaced the shocks w/Bilsteins several years ago. All the bolts are secure (triple checked). The exhaust system is tight and all the hangers are solid. I've been under the car and banged on everything I can find, but cant replicate the rattle. It's coming from the the rear of the car. Something sounds loose and is banging against something else. Everything in the trunk is secure. It's driving me crazy! Any suggestions will be greatly appreciated.
thanks
Phil Connell
My daughter's '95 940 sedan only has 115m miles on it. I replaced the shocks w/Bilsteins several years ago. All the bolts are secure (triple checked). The exhaust system is tight and all the hangers are solid. I've been under the car and banged on everything I can find, but cant replicate the rattle. It's coming from the the rear of the car. Something sounds loose and is banging against something else. Everything in the trunk is secure. It's driving me crazy! Any suggestions will be greatly appreciated.
thanks
Phil Connell
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