Noisy Diff Following refurb
Discussion
Sardonicus said:
uriosity really Daz how did you diagnosis a faulty LSD was it lighting up only one tyre in a straight line? who told you it was knackered?
I was told if you get the car in the air ,get your mate to hold on wheel solid the other should have tension ,if it spins freely without any tension the lsd is shot .SILICONEKIDOBHP said:
I was told if you get the car in the air ,get your mate to hold on wheel solid the other should have tension ,if it spins freely without any tension the lsd is shot .
If i do that with mine Daz, i also have, surprisingly, very little resistance. However if i spin the wheels it always leaves two black lines on the road which tells me its working fine.SILICONEKIDOBHP said:
I was told if you get the car in the air ,get your mate to hold on wheel solid the other should have tension ,if it spins freely without any tension the lsd is shot .
Really who was stopping the prop-shaft turning then while you carried this test out? Carsy's bench test is more telling anyway I cant be here jibber jabbing I have a gearbox to remove Edited by Sardonicus on Thursday 24th July 12:41
Your right in what you say about the running wearing a pattern on the crown wheel and pinion.. if they have been run with ‘almost’ not clearance, this is where they are bedded in (shiny area on the gears)… now they have been pulled apart a bit, they are running maybe on the edges of the existing wear pattern... also new bearing will re-position them slightly...
I’ve blued up a few diffs to get them running right and the drive through the correct places on the gear wheels when under load…. I think however the advice they gave you is good.. run it for a bit and it should now wear into its new position.
The noise will be coming from the fact that the gear teeth are not exactly the right shape where they are contacting due to previous wear.. this will bed-in over a few hundred miles and should stop the noise….
Good luck.. hope it works
I’ve blued up a few diffs to get them running right and the drive through the correct places on the gear wheels when under load…. I think however the advice they gave you is good.. run it for a bit and it should now wear into its new position.
The noise will be coming from the fact that the gear teeth are not exactly the right shape where they are contacting due to previous wear.. this will bed-in over a few hundred miles and should stop the noise….
Good luck.. hope it works
TVR Beaver, thanks for the info, I would hope that it was inspected with engineers blue like you suggest, thats what I would have done had I had the bottle to pull it apart but hearing how hard the bearings can be to remove I left it to the experts.
I suppose how long it takes to bed back in will depend how long it's run with the wrong backlash.
I was on holiday at the time the diff was dont so my mate made the decission to reassemble the diff with the same gears after talking to John, I still dont know what my decision would have been, the diff was fairly quiet before so I think I'd have assumed it would be the same when it wnet back together.
At least the sun is out so I'm enjoying running it back in and worst case it's £8-900 to put it right as I look out the office window I forgive it all the money it costs me....
I suppose how long it takes to bed back in will depend how long it's run with the wrong backlash.
I was on holiday at the time the diff was dont so my mate made the decission to reassemble the diff with the same gears after talking to John, I still dont know what my decision would have been, the diff was fairly quiet before so I think I'd have assumed it would be the same when it wnet back together.
At least the sun is out so I'm enjoying running it back in and worst case it's £8-900 to put it right as I look out the office window I forgive it all the money it costs me....
nigelj77 said:
...I had the bottle to pull it apart but hearing how hard the bearings can be to remove I left it to the experts.....
FYI specifically for GKN diffs.. The outer bearings come out easily as long as you know how to release a circlip and screw them out evenly. The inner bearings the same, its only making up something to 'spread' the casing thats a bit off-putting I'd guess but its only a case of making up a couple of brackets and then a big nut+bolt to jack them apart?Probably more concerning IMHO are a lot of old PH threads advising cranking up the nut as tight as possible which I can only visualize would increase the float in addition to the normal wear ~ opposite of your situation where it's had no float though.
Sardonicus said:
SILICONEKIDOBHP said:
I was told if you get the car in the air ,get your mate to hold on wheel solid the other should have tension ,if it spins freely without any tension the lsd is shot .
Really who was stopping the prop-shaft turning then while you carried this test out? Carsy's bench test is more telling anyway I cant be here jibber jabbing I have a gearbox to remove Edited by Sardonicus on Thursday 24th July 12:41
Apologies to the o.p. for hijacking his thread. Cheers.
Update on my noisy diff following it being refurbished, I'm now 350 miles through the 1000 that many sources have suggested should settle it down.
So far the diff isn't quietening down, this weekend I've done about 130 miles in the car and after a long run the diff seems to sound even worse than normally, I'm wondering if the temperature is thinning the oil and therefore there's no cushioning effect between the gears.
Opinions would be appreciated on whether after 350 it should be settling down at all, as I say at the moment if anything I think it's sounding worse.
The gentleman who did the diff refurb is currently on holiday but back next week so I'm planning to also speak to him to see what he thinks is going on.
Cheers.
So far the diff isn't quietening down, this weekend I've done about 130 miles in the car and after a long run the diff seems to sound even worse than normally, I'm wondering if the temperature is thinning the oil and therefore there's no cushioning effect between the gears.
Opinions would be appreciated on whether after 350 it should be settling down at all, as I say at the moment if anything I think it's sounding worse.
The gentleman who did the diff refurb is currently on holiday but back next week so I'm planning to also speak to him to see what he thinks is going on.
Cheers.
Sardonicus said:
uriosity really Daz how did you diagnosis a faulty LSD was it lighting up only one tyre in a straight line? who told you it was knackered?
Well i was told by the "specialists" .They put the car in the air ,got his mate to hold one wheel solid while the other guy turned it ,there should be some tension ..Am i correct ?If its wrong i have a perfectly good GKN diff sitting on the garage floor .
Tell you the truth i hate the BTR 3.45 diff ,it`s to low geared .
SILICONEKID345HP said:
Sardonicus said:
uriosity really Daz how did you diagnosis a faulty LSD was it lighting up only one tyre in a straight line? who told you it was knackered?
If its wrong i have a perfectly good GKN diff sitting on the garage floor .Tell you the truth i hate the BTR 3.45 diff ,it`s to low geared .
Pupp said:
SILICONEKID345HP said:
Sardonicus said:
uriosity really Daz how did you diagnosis a faulty LSD was it lighting up only one tyre in a straight line? who told you it was knackered?
If its wrong i have a perfectly good GKN diff sitting on the garage floor .Tell you the truth i hate the BTR 3.45 diff ,it`s to low geared .
Pupp said:
You could always swap it for this one - no mention of that being faulty...
That`s a bargain .. that famous breaker up north wants that for the transducer pickup .Its in working order ..The clunk was down to the wrong gearbox mounts fitted ..sitting to low .
Edited by SILICONEKID345HP on Monday 25th August 21:28
SILICONEKID345HP said:
That`s a bargain .. that famous breaker up north wants that for the transducer pickup .
Its in working order ..The clunk was down to the wrong gearbox mounts fitted ..sitting to low .
Hang on, didnt you say you thought it was knackered so changed it to a btr? Its in working order ..The clunk was down to the wrong gearbox mounts fitted ..sitting to low .
Edited by SILICONEKID345HP on Monday 25th August 21:28
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