Broken Birf?

Chris_CHCH · Post by **Chris_CHCH** » Mon Mar 12, 2012 8:40 pm

Recently picked up an '88 BJ70. Runs great, but after noticing a slight knock coming from the front right, I jacked it up to find a slightly loose wheel bearing. No worries. Pulled the free wheel etc, found the lock nut, and main nut where finger tight at best. Pulled it all, re packed with grease, and good to go! But here's my problem... The axle spins independantly of the diff/drive shaft! So 3 wheels on the ground, I would expect the drive shaft to turn when I turn the axle. So whats busted? I would have expected a whole bunch of nasty noises in there if something had blown. I was thinking that maybe the PO had pulled out the old BIRF, and just shafted me, but when I turn the drive shaft by hand, the axle turns, but it's more of a viscous coupling ie: I can stop the axle, but the drive shaft will keep turning.

Any thoughts?! I really I haven't overlooked something really obvious.

Thanks in advance

Chris

coxsy · Post by **coxsy** » Mon Mar 12, 2012 8:45 pm

Birf whats that, axle should turn if hubs not locked

Chris_CHCH · Post by **Chris_CHCH** » Mon Mar 12, 2012 8:47 pm

This is with the hubs locked. Sorry Birfield joint. The c.v in the knuckle.

I thought the locking hub might be poked, but a threaded a 12mm bolt into the actual drive shaft, and still nothing.

coxsy · Post by **coxsy** » Mon Mar 12, 2012 8:53 pm

ok up with the play now. duh, with locked hub, no you got problems,saw one once, axle part of the cv into the hub broke :roll:

Smurf · Post by **Smurf** » Mon Mar 12, 2012 8:57 pm

http://www.offroadexpress.co.nz/Forums/ ... 2&start=30

Chris_CHCH · Post by **Chris_CHCH** » Mon Mar 12, 2012 9:00 pm

Oh well... Was going to replace some bearings and seals, so nows a good time I guess.

Cheers

oldblue · Post by **oldblue** » Tue Mar 13, 2012 11:11 am

Have you fitted the freewheel endcap correctly, little metal tabs on the slideing clutch lined up with the larger master groved splines in the main body? If not ,the clutch won't enguage.

Chris_CHCH · Post by **Chris_CHCH** » Tue Mar 13, 2012 11:49 am

Yeah, I thought it might have been the free wheel hub, but I physically turned the end of the drive shaft. Got a heap of degreaser and am going to pull it apart tonight. Biggest concern is that there is no obvious sign as to why I have no drive to the axle. There's no odd noises etc. Am worried the PO has had a breakage at some point and has just pulled the old one out, and stuck it all back together without the CV. Hope it ain't a major!

Chris

Sadam_Husain · Post by **Sadam_Husain** » Tue Mar 13, 2012 12:02 pm

once you've got both free wheeling hubs off you can soon see by turning the axles and driveshaft if theres a problem with the diff or cv's. If a CV's broken generally you'll know it without pulling everything down coz it gets pretty crunchy with all the broken bits and it usually affects the steering lock as well

Chris_CHCH · Post by **Chris_CHCH** » Tue Mar 13, 2012 12:22 pm

This is what has me concerned... There's no nasty noises at all. Changed the diff oil a week back, and no major chunks of steel etc so I'm really at a loss. Will report back tonight!

Chris_CHCH · Post by **Chris_CHCH** » Tue Mar 13, 2012 12:38 pm

oldblue wrote:Have you fitted the freewheel endcap correctly, little metal tabs on the slideing clutch lined up with the larger master groved splines in the main body? If not ,the clutch won't enguage.

I know that the right freewheel is correct, but maybe the other side is installed incorrectly! Will check this first. Hadn'e really thought about it, as haven't touched the other side. F@rk I hope thats what it is!

Cheers guys

Chris

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