Clunking noise on takeoff/braking
- adam_rxturbo
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Clunking noise on takeoff/braking
Hey,
I recently pulled out my gearbox and put it back in with a new clutch and new oil... It was running fine for a few weeks, and now, all of a sudden there is a loud clunk/thud coming through the floor around the driver and passenger side footwell. A loud audible clunk which can be felt by your feet through the floor... The noise only really happens with accel/deccel. Clunk is used to only happen every time you go to take off/release clutch, and under heavy braking... But nowadays (2-3 weeks on) its happening a lot, and can even clunk up to 4 times consecutively upon takeoff and braking.
It was suggested to me that it is radius rod bushes. I've checked them out, they are a bit worn, and have a bit of movement in them, but they are still there. The noise sounds like they have completely perished and there is no bush there anymore! And it makes me wonder how it can clunk 4 times consecutively upon takeoff - without any forward/backward suspension movement/rocking... It just happens 4 times when taking off straight and smooth.
Any ideas? Or is it definately a radius rod problem? Or something i might have missed when putting the gearbox back in? I did have some leftover parts, but nothing that i thought would be able to make this much noise!!
Cheers
-Adam
P.s. all engine and gearbox mounts are a-ok
edit: the other thing i just remembered is that the rear diff seemed to have a bit of freeplay in it. sorta borderline backlash, but i didnt think this would make a clunk in the footwell...
I recently pulled out my gearbox and put it back in with a new clutch and new oil... It was running fine for a few weeks, and now, all of a sudden there is a loud clunk/thud coming through the floor around the driver and passenger side footwell. A loud audible clunk which can be felt by your feet through the floor... The noise only really happens with accel/deccel. Clunk is used to only happen every time you go to take off/release clutch, and under heavy braking... But nowadays (2-3 weeks on) its happening a lot, and can even clunk up to 4 times consecutively upon takeoff and braking.
It was suggested to me that it is radius rod bushes. I've checked them out, they are a bit worn, and have a bit of movement in them, but they are still there. The noise sounds like they have completely perished and there is no bush there anymore! And it makes me wonder how it can clunk 4 times consecutively upon takeoff - without any forward/backward suspension movement/rocking... It just happens 4 times when taking off straight and smooth.
Any ideas? Or is it definately a radius rod problem? Or something i might have missed when putting the gearbox back in? I did have some leftover parts, but nothing that i thought would be able to make this much noise!!
Cheers
-Adam
P.s. all engine and gearbox mounts are a-ok
edit: the other thing i just remembered is that the rear diff seemed to have a bit of freeplay in it. sorta borderline backlash, but i didnt think this would make a clunk in the footwell...
- Outback bloke
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- adam_rxturbo
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- Location: westlake - east brisbane
engine crossmember was never undone :P but i'll check it next time im under the car.
And brett, it can happen when lightly lifting off and putting down the accelerator while cruising, but it usually needs a bit of a harder suspension movement to make the noise, but it sounds like you're on the right track.
I'm getting some nolethane bushes from xtreme RX as soon as he gets the stock in and i'll see how that goes. But like i said, its baffled me now that it makes up to 4 noises one imediately after the other without shift in suspension (after the initial shift)
Cheers
-Adam
And brett, it can happen when lightly lifting off and putting down the accelerator while cruising, but it usually needs a bit of a harder suspension movement to make the noise, but it sounds like you're on the right track.
I'm getting some nolethane bushes from xtreme RX as soon as he gets the stock in and i'll see how that goes. But like i said, its baffled me now that it makes up to 4 noises one imediately after the other without shift in suspension (after the initial shift)
Cheers
-Adam
- tim_81coupe
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- adam_rxturbo
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had a look under the car again today,
Engine and gearbox crossmembers are both definately tight!
The sway bar bushes is an interesting suggestion, because i noticed mine today - on the ends where it joins to the links - which seem quite worn out, and hard - however still there. Might replace them aswell...
Cheers
-Adam
Engine and gearbox crossmembers are both definately tight!
The sway bar bushes is an interesting suggestion, because i noticed mine today - on the ends where it joins to the links - which seem quite worn out, and hard - however still there. Might replace them aswell...
Cheers
-Adam
- adam_rxturbo
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- adam_rxturbo
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- Location: westlake - east brisbane
another thing i thought of recently.. was drive shafts... I know the boots are worn and nearly split in my current ones. Is it possible that a worn CV shaft would be able to make a similar clunk noise? which would make far more sence in relation to the 4 consecutive clunks rather than suspension movement...
Cheers
-Adam
Cheers
-Adam
- adam_rxturbo
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ok, bit of an update. I got the car up on the hoist again yesterday arvo, and checked the tightness of everything i thought was related - except one thing mentioned in a moment. Crossmembers, radius rods, pitch rods, swaybars - the lot. Nothing was loose at all.
Swaybar link bushes do look to be quite worn out and are squished up to pankakes But i've ordered them up from xtremeRX so will replace them asap.
The other thing i only just thought of while replying to that liberty idea thread... Is that i had the driveshafts out in the front and back many times, and had also rolled the car on the ground without driveshafts in them - with the wheel bearing making some clunking noises while it was rolling (since it wasnt located by the driveshaft)... And that made me think. What if that little thrust washer between the knuckle/bearing and the driveshaft wasnt quite sitting right, and i had tightened the nut on the end of the driveshaft like that, and now it has moved around a little and is causing the clunking noises?!
Is there any proper proceedure for fitting up the driveshafts through the hub and tightening the nut on the end properly (in regards to torque, i just did it up with the rattle gun to about 100 ft/pound - wheel nut torque). By way of proceedure, i mean by locating the thrust washer properly, and spinning the wheel/driveshaft or something to make sure its sitting properly? Or is it just a whack together job - like i did?
Cheers!
-Adam
Swaybar link bushes do look to be quite worn out and are squished up to pankakes But i've ordered them up from xtremeRX so will replace them asap.
The other thing i only just thought of while replying to that liberty idea thread... Is that i had the driveshafts out in the front and back many times, and had also rolled the car on the ground without driveshafts in them - with the wheel bearing making some clunking noises while it was rolling (since it wasnt located by the driveshaft)... And that made me think. What if that little thrust washer between the knuckle/bearing and the driveshaft wasnt quite sitting right, and i had tightened the nut on the end of the driveshaft like that, and now it has moved around a little and is causing the clunking noises?!
Is there any proper proceedure for fitting up the driveshafts through the hub and tightening the nut on the end properly (in regards to torque, i just did it up with the rattle gun to about 100 ft/pound - wheel nut torque). By way of proceedure, i mean by locating the thrust washer properly, and spinning the wheel/driveshaft or something to make sure its sitting properly? Or is it just a whack together job - like i did?
Cheers!
-Adam
- BaronVonChickenPants
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- adam_rxturbo
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ok, checked out the drive shaft nuts today, and they are definately still tight, and the split pins are still in them and are in perfect condition - no squashing/bending/evidence of nut undoing. So the nuts are still tight... however is there any correct seating of the thrust washer? it SHOULD still have been located in the right direction...
I've just known that for some 4wd's, the thrust washer can sit slightly out of place, and will usually prevent a circlip being able to fit onto the drive shaft once all the hub has been installed...
I also checked for bearing play while i was at it, and there doesnt appear to be any movement in the wheel/bearing.
Should be getting those radius rod bushes from Xtreme RX soon!
Cheers
-Adam
I've just known that for some 4wd's, the thrust washer can sit slightly out of place, and will usually prevent a circlip being able to fit onto the drive shaft once all the hub has been installed...
I also checked for bearing play while i was at it, and there doesnt appear to be any movement in the wheel/bearing.
Should be getting those radius rod bushes from Xtreme RX soon!
Cheers
-Adam
- adam_rxturbo
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once again, for anyone interested - an update.
changed over the gearbox for an AWD one on the weekend - with different front driveshafts. And now, the clunking noise is completely GONE! Havent touched anything else! Original radius rod bushes are still in there!
So i guess it was either a clunk in the gearbox somewhere, or the worn out driveshafts. (the radius rod bushes did seem a bit far out to make the noises i were hearing )
Only problem now is that i've got gearbox noise - see to other threads if you're really interested hehe
ok enough out of me.
Cheers
-Adam
changed over the gearbox for an AWD one on the weekend - with different front driveshafts. And now, the clunking noise is completely GONE! Havent touched anything else! Original radius rod bushes are still in there!
So i guess it was either a clunk in the gearbox somewhere, or the worn out driveshafts. (the radius rod bushes did seem a bit far out to make the noises i were hearing )
Only problem now is that i've got gearbox noise - see to other threads if you're really interested hehe
ok enough out of me.
Cheers
-Adam
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