Disco-Ron Posted April 12, 2009 Share Posted April 12, 2009 Just repolace d abroken rear diff in my disco, have fitted a four pin one i got on the bay, however when i lift off the gas, it whines a bit, there's nothing broken in it, and it seems to be in good condition, no chipped teeth etc, and not set too tight either, as there was very slight movement between the pinion and ring gear.... Any ideas....?? Quote Link to comment Share on other sites More sharing options...
Les Henson Posted April 12, 2009 Share Posted April 12, 2009 Remove the missus from the back seat and all will be fine. Les Quote Link to comment Share on other sites More sharing options...
BogMonster Posted April 12, 2009 Share Posted April 12, 2009 A couple of posts with a little more information than was needed have been removed - keep it clean chaps Quote Link to comment Share on other sites More sharing options...
Disco-Ron Posted April 12, 2009 Author Share Posted April 12, 2009 Forget it, if we're not allowed to have a joke, i'll live with the whine, it's easier..... Quote Link to comment Share on other sites More sharing options...
scube Posted April 12, 2009 Share Posted April 12, 2009 Whine in the diff is usually to do with the crown wheel and pinion not meshing properly due to ware or incorrect adjustment. One way to check is to get hold of some engineers blue and paint the crown wheel gear face when you tern the diff there should be an even contact mark on the teeth. There have been a few posts within this forum on how to set a diff up. Though to be honest I tried to do it myself once and ended up with a diff that wined more than my Ex and I couldn’t be bothered to mess around any more and fitted another one, job done. Quote Link to comment Share on other sites More sharing options...
Les Henson Posted April 12, 2009 Share Posted April 12, 2009 There have been a few posts within this forum on how to set a diff up. There will be at the end of next week I think (looking forward to it as well ) Les Quote Link to comment Share on other sites More sharing options...
Hybrid_From_Hell Posted April 12, 2009 Share Posted April 12, 2009 Quite often a diff will have worn bearings for both the carrier and pinion, and as such loads of miles done on them. Then they get so bad the bearing are replaced, then the mesh between the CW&P is very different to what its used to so even IF (and note the big IF) its set up right it will still howl and whine like a teenager being deprived of his hoodie Nige Quote Link to comment Share on other sites More sharing options...
Timmy511 Posted April 12, 2009 Share Posted April 12, 2009 is the wine a bad thing? i know obviously its not good but will incorrect mesh/wear cause the diff to fail in a catastropic way? Quote Link to comment Share on other sites More sharing options...
Hybrid_From_Hell Posted April 12, 2009 Share Posted April 12, 2009 Not really Sometimes if you can put up with it the mesh will re establish and go away On the other hand it can get worse On one on my old racers a salisbury rear made such a howl I could be heard 2 mins away from the pits maybe thats why I am also now finding meself part deaf as it was unbearable in the race truck with a 5.7 chevy driveing the howl Unlikley to damage badly, but if it eats through the hardening you may be in trouble, equally dependant on how good the mesh the pinion CW may move on loads of "Giving it large" and strip teeth - however that can happen on ok diffs too. Maybe Mr Ashcroft will impart some real knowledge vs my ramblings ?? nige Quote Link to comment Share on other sites More sharing options...
Les Henson Posted April 12, 2009 Share Posted April 12, 2009 As Nige says - a really bad mesh prior to a rebuild will give you problems. You should check the contact patch on the crownwheel teeth (a shinier than the rest area). If it's off to one end, then the teeth may well be too far out of original profile, and the crownwheel and pinion should be replaced as a matched pair. It must be annoying to have rebuilt the diff and then find you might need to take it apart again. Les. Quote Link to comment Share on other sites More sharing options...
BogMonster Posted April 12, 2009 Share Posted April 12, 2009 is the wine a bad thing? EP90 is better Quote Link to comment Share on other sites More sharing options...
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