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[Dodster]

Just got my zj back from having a new rear prop shaft oil seal fitted. Been for a run and have now got a whining sound from the rear when accelerating and a momentary grinding sound when takin the foot off the gas. Ive bin underneath and there seems to be a lot of play where the prop goes into the diff. I know F.A about cars and when i take it back i'd like to pretend i know what im on about. Any ideas please.

Phil

[Anonymous]

Soz mate, can't help with that one... one of the guys probably will though

[Mike Pavelin]

DON'T drive around like this or you'll knacker the diff!
Basically they've fucked up the preload on your pinion bearings. To fix this properly the diff now needs stripping, the crush spacer in the pinion assembly replaced and then the preload set up properly.
To replace a pinion oil seal without buggering it up, you should measure the rolling torque of the pinion with an inch/pound torque wrench, mark the position of the pinion nut on the pinion and yoke before removal. After replacing oil seal tighten the nut to it's original position. This should then give the same rolling torque on the pinion thereby indicating that the bearing preload has been restored.
Take it to someone who knows what they're doing and send the other lot the bill.

[Dodster]

Many thanks for that Mike, i would have probably carried on driving so i reckon youve saved me some cash, ( If youre at CF I will bring as much Guinness as you can drink), also goes to show the value of this Forum.

Thanks again

Phil

[Mik]

Its unlikely that theyve overtightened the pinion nut, it can take as much as 350 ft/lbs to crush the sleeve and thats not easy to do by accident/incompetance.
Final assembly torque on the pinion nut is 200 ft/lbs but your normal monkey will just wind it on with the windy so it could be anything.
If youre lucky torqueing it to 200 ft/lbs will sort it. If not then somebody has some big money to spend.
Hopefully, not you

HTH

Mik

[Mike Pavelin]

There isn't actually a given torque when tightening the pinion nut, only the 350 lb maximum which shouldn't be exceeded. The idea is to crush the spacer by just enough to preload the pinion bearings by the correct amount, hence the need to measure the rolling torqe at the pinion flange. If the pinion nut is later undone it can be marked and then retightened very carefully to it's original position, although this isn't best practice it works in the real world when the oil seal is replaced, avoilding the nedd to strip the diff and replace the crush spacer every time. Great care must be taken when tightening the pinion nut, as overtightening could cause the bearings to overheat and sieze.

[Mik]

There isn't actually a given torque when tightening the pinion nut,

Unless you look in a DC or Dana manual  

[Dodster]

Thanks again guys, im beginning to understand a bit more..
Its gone straight back to them as it initially went in under a warranty and so shouldnt cost me anything. It was nice to see their cheeks puffing when i started torquing about pre loads and crush spacers.

The next thing is though when i do get it back where can i find someone trustworthy and reliable for service and repairs(not dealers) within a 50 mile radius of lichfield, Staffs....

Any recommendations gratefully received...

Phil

[Bubba]

sfunney but there isnt a crush sleeve in all of em

[Mike Pavelin]

Mik. You're kind of right there. There is a 220 ft/lb torque quoted as a starting point when fitting the nut. After the nut is on it is gradually tightened further to get that correct turning torque on the pinion mentioned earlier.
Bubba. Some Dana axles I've seen do have preload shims instead of the crush spacer, but I've only ever seen these on the front axles on modern jeeps. Might be more common on the older stuff though.
Dodster. If you have a used car warranty on it you might as well have taken it to a local Jeep dealership. At least they'd have a better idea than most other garages what to do with it.

[Dodster]

Thanks again to everyone for the info, eveythings been sorted today and no charge which is even better .
 

Phil

[Manda]

I'm glad to hear it.  

[Bubba]

yup mr p yjs are shim style at the front

[Mike Pavelin]

Yup, I seem to recall the same on WJs too.

[Dodster]

Yup i dont know what youre talkin about....

Jeep talk in our house:  

Dana  =  Dark haired irish singer

Axle   =   A funny beverly hills cop

Shim   =  Baddy in Kill Bill

Tj       =   A fat american cop with the hot blonde pardner

Seal   =   A noisy sea creature with a ball on its nose

Shaft  =  Another american cop

Face lift  =  Refer to TJ

BFG  =  Big F##k off giant

Winch  =  The one who brings you food and ale

Cat  =  Lazy fluffy dopey thing by the fire or dirty minger off eastenders

Rim  =   Dont even think about that one

Pinion  =  Motorcycle passenger ?

An on it goes

Phil

[horobi]

[Anonymous]

 

[Anonymous]

Very funny

[Mick O]

:smt081