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Post by widge on Jun 17, 2018 15:37:28 GMT
H I wonder if anyone had any suggestions!
I have had a noise from the rear transmission for about a year now and it is slowly getting worse, Initially I thought it was the diff especially as when I drained the oil there were lots of iron filings and magnetic sludge stuck to the drain magnet, I managed to pick up a second hand diff and replaced it a couple of months ago, but basically this did not get rid of the noise, I don't think that it is a wheel bearing as it isn't just a whine there is defiantly a pulsing noise as you go along, which again is why I thought that it was the diff.
Yesterday I jacked the rear end up and had a good look I could not feel any movement in the wheels indicating a wheel bearing problem, I then disconnected the rear driveshafts from the diff one at a time and manually rotated each rear wheel using the driveshaft, making a point to crank the driveshaft so that I was forcing the CV joints to their limit to see if I could feel any roughness or slop, I could not tell any difference between them and I couldn't feel anything obvious. I didn't disconnect the prop-shaft but couldn't feel any slop in the universal joint connecting that to the diff.
So I am at a loss, I possibly fitted another dodgy diff but I wouldn't expect it to make exactly the same noise as the one I took out.
The noise defiantly sounds like it is coming from the rear, but I am not 100% which side, I am planning to take both rear seats out and take it for a drive with a friend in the back to see if he can locate the noise any better.
Wheel bearing are not a bad price and I could pick up a pair of second hand driveshafts for about £80 alternatively change the CV joints on the existing driveshafts (but I am not sure if you need any special tools), but I really don't want to do it trial and error.
Does anyone happen to know the ratio of the differential (prop-shaft rotations to driveshaft rotations) as I said before there is a definite pulsing in the noise, by timing this and knowing what speed I am doing, diameter of the wheel etc I should be able to work out if the noise ties up with the prop-shaft or driveshaft rotations.
I know that if I take it to the local Toyota dealer it will cost me a fortune, I do know a very good and reasonably priced mechanic who is more than happy for me to source any parts, but he is a pain to get to as he is about an hour away, and it will probably mean that the car will be off the road for a week or two (by the time I order parts etc) which I cannot afford to do at the moment.
Any other ideas or tips to track down what is causing the noise welcome.
Thanks in advance Dave
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Post by jasehutch on Jun 17, 2018 15:53:22 GMT
Hi Dave , is the noise there if you freewheel down a gradient ?
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Post by widge on Jun 17, 2018 16:46:49 GMT
Hi
Not sure if I can do that, you need to get to at least 20mph before you can really hear it, also it is an automatic I am not sure if you are supposed to do freewheel like that, if fact you have reminded me, I have been meaning to look in the manual to find out about towing, I know auto's don't like being towed they normally lift the front or back depending on where the drive wheels are, but as the RAV is a AWD I am not sure what you are supposed to do, I will go and look now.
But as far as the noise, the drive train will still be turning so I would imagine the noise would be similar, although admittedly after thinking about it, the drive will be from the wheels not from the driveshaft all the forces will be the opposite sides of any gears or joints (but not bearings!)
Dave
PS Just had a look at the manual, and you are not supposed to tow if you can avoid it, even then only at slow speed for a short distance, and freewheeling down a hill is basically the same as towing, so I think that I would prefer not to do that.
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Post by anchorman on Jun 17, 2018 17:00:03 GMT
Tyres can be responsible for some curious noises.
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Post by firemac on Jun 18, 2018 10:33:15 GMT
Tyres can be responsible for some curious noises. I agree with Don. I bought a 4.2 3-dr a few years back that had a set of Duellers which made an awful racket. New set of tyres solved the problem completely. Perhaps if you swap the tyres front to back and see if the frequency, tone or loudness of the noise changes, that will give you a clue. Good luck  . |
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Post by widge on Jun 21, 2018 12:06:52 GMT
Hi
Yesterday I stripped the rear seats and carpet out, and took it out for a drive, my wife in the drivers seat and me in the back with my ear to the floor, there is defiantly some clicking to be heard that ties in with the other noises that I am hearing, so I have decided that it is probably a CV joint and although the noise appears to be coming from the drivers side I am still not sure.
Anyway I found a pair of second hand driveshafts on eBay going for £70 including shipping which wasn't much more that other people were charging for one so I have gone for it.
From what I can see all I have to do is undo the 4 bolts holding the driveshaft onto the diff, then undo the single bolt in the center of the hub on the other end and knock the driveshaft back through the hub and shouldn't involve undoing anything else, in which case it shouldn't take more than about 15 mins each side (famous last words).
If anyone has any experience doing this any hints would be gratefully received.
Dave
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Post by anchorman on Jun 21, 2018 13:50:14 GMT
Hi
Yesterday I stripped the rear seats and carpet out, and took it out for a drive, my wife in the drivers seat and me in the back with my ear to the floor, there is defiantly some clicking to be heard that ties in with the other noises that I am hearing, so I have decided that it is probably a CV joint and although the noise appears to be coming from the drivers side I am still not sure.
Anyway I found a pair of second hand driveshafts on eBay going for £70 including shipping which wasn't much more that other people were charging for one so I have gone for it.
From what I can see all I have to do is undo the 4 bolts holding the driveshaft onto the diff, then undo the single bolt in the center of the hub on the other end and knock the driveshaft back through the hub and shouldn't involve undoing anything else, in which case it shouldn't take more than about 15 mins each side (famous last words).
If anyone has any experience doing this any hints would be gratefully received.
Dave
What does this noise sound like Dave? Is it a kind of rumble or thud on every rotation of the wheel? |
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Post by anchorman on Jun 21, 2018 13:50:45 GMT
That’s turned up as an edit!
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Post by widge on Jun 21, 2018 15:31:24 GMT
Hi
Yesterday I stripped the rear seats and carpet out, and took it out for a drive, my wife in the drivers seat and me in the back with my ear to the floor, there is defiantly some clicking to be heard that ties in with the other noises that I am hearing, so I have decided that it is probably a CV joint and although the noise appears to be coming from the drivers side I am still not sure.
Anyway I found a pair of second hand driveshafts on eBay going for £70 including shipping which wasn't much more that other people were charging for one so I have gone for it.
From what I can see all I have to do is undo the 4 bolts holding the driveshaft onto the diff, then undo the single bolt in the center of the hub on the other end and knock the driveshaft back through the hub and shouldn't involve undoing anything else, in which case it shouldn't take more than about 15 mins each side (famous last words).
If anyone has any experience doing this any hints would be gratefully received.
Dave
What does this noise sound like Dave? Is it a kind of rumble or thud on every rotation of the wheel? I would say thud rather than rumble, but not particularly loud more like the background noise from a disco in the distance. But during the last test I could also hear a clicking at the same time hence ordering the replacement drive shafts. The only other thing is possibly a wheel bearing but it doesn't sound quite right, also I cannot feel any slack or roughness when I turn the wheel by hand. Dave |
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Post by anchorman on Jun 21, 2018 16:35:27 GMT
If it’s once per rev it’s the bands and discs. It’s a common ailment on a 4.2. The pad picks up on a lump on the disc and it rattles it in the caliper. I’ve done several, not because they were worn out but because of the racket they make. Pads and discs will cure it.
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Post by anchorman on Jun 21, 2018 16:36:13 GMT
Bloody predictive text. Pads not bands.
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Post by widge on Jun 21, 2018 20:34:41 GMT
If it’s once per rev it’s the bands and discs. It’s a common ailment on a 4.2. The pad picks up on a lump on the disc and it rattles it in the caliper. I’ve done several, not because they were worn out but because of the racket they make. Pads and discs will cure it. Hi
Thanks for the suggestion, but unfortunately this problem has been getting progressively worse for about a year, and back in December I did a full brake service and changed all 4 disks, pads and pins because the previous owner had changed the pads and nothing else, they had left the badly scored disks and corroded pins which caused the new pads to wear very unevenly. and although this did sort out a bit of uneven breaking it had no effect on the noise I am getting.
When I took it for a test drive the other day I did consider the possibility of the handbrake shoe's binding in any way but gently applying the handbrake while moving along slowed the car but had no effect on the noise, and rotating the wheels while the rear end was jacked up showed no sign of them binding.
Thanks again.
Dave
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Post by anchorman on Jun 22, 2018 19:22:31 GMT
Fair enough.
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Post by bothwellbuyer on Jul 8, 2018 19:34:54 GMT
any solution? If I'd seen this earlier, I'd have suggested the central prop bearing
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Post by widge on Jul 11, 2018 5:31:35 GMT
any solution? If I'd seen this earlier, I'd have suggested the central prop bearing Thanks for the comments, on inspection I cannot see or feel anything. But I have now swapped out both driveshafts with no change. I am going to give up for the moment and wait for the noise to get worse, then hopefully it will be more obvious what is causing it. Dave |
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