IRD pinion oil seal not 'o' ring need help pls

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D3savage

Active Member
Posts
292
Hi really need some advice ..... recon vcu failed and put some strain on pinion..... pinion got a bit hot and rear oil seal failed (VCU now fixed) - this is not the 'o' ring but appears to be the seal that is located behind the flange of the propshaft mounting. IRD seems fine just the seal is poor and it aint going to get any better!
Question:- when the prop is disconnected - you see a big single nut holding the prop flange mount on - located at it's centre. Is it safe to attempt to unscrew this???? I think it may be possible to unscrew the nut and slide the prop flange off.....exposing the rear oil seal .... which hopefully can be 'poped out' ......... Has anybody done this, what worries me is the big nut holding the flange on could be set at a preload with a collapsable spacer .... as in most diffs.......... My diff is leaking quite badly ... hope there is a straightforward solution.:(
 
The big nut needs tightened up correctly. Easier to undo the 5 bolts around the pinion to remove the pinion to replace the seal.

These pic's will help you:

n77Ahrr.jpg

irdpinion1 n77Ahrr

l4A2pSp.jpg

irdpinion l4A2pSp
 
Last edited:
Are you after the seal on the pinion in the last pic, or the plastic seal thing to the right? I think it's the seal on the pinion that does the work.

Rear diff is a bit of a pig. It has a crush washer in it. Search for "crush washer" on ere and you'll see what other have done.
 
if nut has torque setting it wont be crushable spacer but shimmed so torque setting isnt important as long as is tight, if it had crushable spacer as with any you tighten up till freeplay gone and tighten a little at a time till a smooth but noticeable preload has been added ,easier said than done as nut will be hard to turn all along thread
 
D3savage said:
Hi really need some advice ..... recon vcu failed and put some strain on pinion..... pinion got a bit hot and rear oil seal failed (VCU now fixed) - this is not the 'o' ring but appears to be the seal that is located behind the flange of the propshaft mounting. IRD seems fine just the seal is poor and it aint going to get any better!
Question:- when the prop is disconnected - you see a big single nut holding the prop flange mount on - located at it's centre. Is it safe to attempt to unscrew this???? I think it may be possible to unscrew the nut and slide the prop flange off.....exposing the rear oil seal .... which hopefully can be 'poped out' ......... Has anybody done this, what worries me is the big nut holding the flange on could be set at a preload with a collapsable spacer .... as in most diffs.......... My diff is leaking quite badly ... hope there is a straightforward solution.:(
Click to expand...
if you paint mark the nut and pinion you can then tighten back to same position,done this many times with no problems as long as the bearings are ok.
 
sorry to butt in but i need to replace a seall on mine as it is weeping oil but not sure if it is the oring seal or the one that looks like cardboard or the inturnal seal if its the first 2 seals do i need to undo and retorque the big centre nut or do i just undo the 5 bolts and pull it out many thanks dawn
 
if its flange seal not visible you just undo nut and replace seal ,if housing to ird joint then leave flange alone and undo 5 bolts silcone sealant put between mating surfaces would seal joint perfectly well without replacing o ring etc
 
hi there many thanks i am not sure which one it is one more common to fail than the other many thanks dawn
 
ok will clean it up and have a look thanks for that dose the front prop shaft have to come off to do this job
 
cremator said:
ok will clean it up and have a look thanks for that dose the front prop shaft have to come off to do this job
Click to expand...
Undo the front bolts holding the front prop to the ird pinion, and tie up the prop out of the way. That will allow access to remove the pinion if needed.
 
Hi thanks all for replying ....... the seal on mine is the one directly behing the prop flange which is a std type oil seal .... not the o ring or the paper seal. If I get flange off ... will I be able to prise out oil seal in situ???? Also will prop flange easily remove??? My leak is getting worse .... doh
 
should do but some need a tap with soft hammer ,ie nylon ,copper ,or wood ,,prise out seal carefully and fill underside of new with vaseline or similar to hold garter spring in place while yuo tap in with suitable socket etc
 
Sorry james what is a garter spring.... is this inside the seal??? are you saying that you should grease new seal .... before putting in? Have you done this before???
 
if you look at reverse side of seal around lip holding lip tight to flange collar a band type spring ,vaseline etc filling and covering this spring stops it bouncing off while fitting seal the taps from fitting with suitable socket and hammer often dislodge it meaning seal will leak
 
Thanks James ...... have you done this particular job before????
I think I will mark the pinion in relation to nut....gingerly remove. Slide prop flange off...
fit seal as you suggest ........ and then put back and retighten to mark - using torque seal.
 
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