Topic: ok guys here's a tuff one (Read 10965 times)

Mik · « **Reply #25 on:** October 31, 2006, 10:02:20 PM »

Despite correct nut torque and bearing preload, worn yoke splines are allowing axial movement and backing the nut off.

Hiythankyew :smt023

MK1 · « **Reply #26 on:** October 31, 2006, 10:16:48 PM »

Quote from: "Mik"

Hiythankyew

Shut up smart arse!

greggmo · « **Reply #27 on:** October 31, 2006, 11:08:19 PM »

hey ya mik dood. the nut is tight as fook and didnt move when i tried to tighten it. do you still think the same mate??

Mik · « **Reply #28 on:** October 31, 2006, 11:56:14 PM »

greggmo · « **Reply #29 on:** November 01, 2006, 12:09:43 AM »

it realy is doin me head in now. it is just wierd. keep thinkin guys cos i need to sort it.

Bubba · « **Reply #30 on:** November 01, 2006, 06:37:28 AM »

its a spensive pain

eastryjeep · « **Reply #31 on:** November 01, 2006, 01:04:35 PM »

If you look at the ring gear does it have an even wear pattern across the flank of the gear teeth?
If so, that's good, if not, and there is local pitting or heavy localised wear it could indicate the pressure angles of the ring gear and the pinion are different and therefore not meshing correctly or that the diff housing itself is distorted.
So, if this problem first came to light after an R/P upgrade that is what I would suspect, or if it came to light after giving the axle assembly a good clout whilst off road I'd tend to lean that way instead.

MK1 · « **Reply #32 on:** November 01, 2006, 01:09:15 PM »

It's pretty much a certainty that it is/was set up right. Kev and 'the professional' (no, not Bodie or Doyle) will have done it right.

eastryjeep · « **Reply #33 on:** November 01, 2006, 01:30:48 PM »

My vote goes to a knackered diff housing then.
Unless they've got a digitizing machine to the check 3D alignment you'd never know, a few tenths of a thou' distortion would be easily enough.
Still, that said, just because a part is new doesn't mean it's not faulty!

MK1 · « **Reply #34 on:** November 01, 2006, 01:33:36 PM »

Quote from: "eastryjeep"

My vote goes to a knackered diff housing then.

Other than the drive line issues mention earlier, then I'd agree. :smt102

isle of man · « **Reply #35 on:** November 01, 2006, 03:11:35 PM »

so it would seem i was correct the pumpkin is u/s.

peter henry

MK1 · « **Reply #36 on:** November 01, 2006, 03:38:53 PM »

Quote from: "isle of man"

so it would seem i was correct the pumpkin is u/s.

Only time will tell, dear Sir.

Bubba · « **Reply #37 on:** November 01, 2006, 09:08:43 PM »

you would need some sexy toys to be able to measure proper

Mik · « **Reply #38 on:** November 01, 2006, 09:13:50 PM »

Quote from: "eastryjeep"

If you look at the ring gear does it have an even wear pattern across the flank of the gear teeth?
If so, that's good, if not, and there is local pitting or heavy localised wear it could indicate the pressure angles of the ring gear and the pinion are different and therefore not meshing correctly or that the diff housing itself is distorted.

Hmmm, technical intrigue....

Whilst what you say is true the ring gear pattern in this case is of zero value. The pinion preload has dissappeared on at least one previous occasion and bearings only have been replaced. The Ring and Pinion have been re-installed.

How would diff housing distortion lead to pinion bearing preload loss ?

isle of man · « **Reply #39 on:** November 01, 2006, 09:30:51 PM »

Quote from: "Mik"

How would diff housing distortion lead to pinion bearing preload loss ?

if the prop and half shaft are not binding the oil is at the correct level the pinion bearing have been fitted and set by a professional a quality part has been used then the logical answer is the pumpkin is causing stress on the bearing.

have i missed something?

peter henry

chrisjones · « **Reply #40 on:** November 01, 2006, 09:33:55 PM »

Is one of the bearing seats damaged so that the bearings aren't sitting properly in line? Or...I know it's a long shot, is the pinion shaft out of alignment. On second thoughts it can't be the shaft else you wouldn't get an even contact pattern.

Is it clear what's happening, are the bearings going, or is the R&P setting going off? If it's the bearings are they just being starved of oil somehow?

If the pinion nut is still tight, surely the only thing which can cause the preload to go is if the crush washer is taking a beating somehow or the bearings aren't seating properly?? :? :?

greggmo · « **Reply #41 on:** November 01, 2006, 09:35:16 PM »

i am still at a loss. it just dont make sence. the old stuff was as good as gold with over a hundred thou on it. i dont see how the deff housing can be fooked when up untill the regear all was cool. :smt088

Bubba · « **Reply #42 on:** November 01, 2006, 09:38:03 PM »

i do see what you saying kinda sorta but i reely think its not the root problem but heck i am proly talkin out me ass

Mike Pavelin · « **Reply #43 on:** November 01, 2006, 09:43:47 PM »

So are the bearings discoloured as well indicating overheating for some reason or is the preload just disappearing?

chrisjones · « **Reply #44 on:** November 01, 2006, 09:45:13 PM »

I'm probably completely wrong, but surely you wouldn't be able to get a correct contact pattern if the pumpkin was deformed would you?

Is the new pioion shaft slightly under size?.... maybe??

greggmo · « **Reply #45 on:** November 01, 2006, 10:03:46 PM »

it is all still in at the moment so i cant say on the discolouration. i cant remember what the last ones looked like. :thinking:

MK1 · « **Reply #46 on:** November 02, 2006, 10:14:42 AM »

The thinking is that there must be some misalignment somewhere in the system. This is after checking bearing seats etc.

If not driveline, UJs etc, then surely in the diff case/axle?

eastryjeep · « **Reply #47 on:** November 02, 2006, 10:27:09 AM »

Ok, so troubles have started since a re-gear, sorry, I was not aware of that!
I think we can more or less rule out the driveline now unless you dropped the T/Case or rotated the diff at the same time, but just in case some evil little pixie is waiting to bite me in the arse for that statement, get an inclinometer (fancy adjustable spirit level) and check the transmission output shaft vs the pinion shaft & ensure they are parallel. If they are great, if not, make them so! Misalignment here makes universal joints into very cross cardians, fleeces, woolies etc!
A rotated diff housing would obviously starve the bearings of oil and cook the wee buggers, and if they are getting hot then so is the pinion shaft which will increase slightly in diameter and get longer by a thou' or so and then all your pre-load has gone straight out the window! This would be true for oil starvation for any reason too.
Bugger this really is a frustrating one in't it?

isle of man · « **Reply #48 on:** November 03, 2006, 09:52:01 AM »

it has come to my attention that i may have missed something with the pumpkin........when the ring and pinion was replaced can you recall if the oil deflector and cup was retained?

peter henry

isle of man · « **Reply #49 on:** November 03, 2006, 07:06:07 PM »

ok,
to take this a little further i can now give the part numbers of the parts i believe that are missing - j093 4937 and 3893 962

Hiythankyew

peter henry

Author Topic: ok guys here's a tuff one (Read 10965 times)

Mik

MK1

Mik

eastryjeep

MK1

eastryjeep

MK1

MK1

Mik

Mike Pavelin

MK1

eastryjeep