Thread: Viscous Coupling replacement

Output shaft looks fine, chain inspection....maybe tomorrow

You cannot tell from the front as the splines in the centre of the diff just wear to nothing but you cannot see it unless you take off the rear housing, however for some reason this seems to happen on Classics , but the chain seems to wear on 38As instead. Give me the shaft failing any time.

Regards Philip A

Oops, sorry, meant to start a new thread!

A couple of pics...

Perth-20130930-00257.jpg
Jammed into the housing ready to be extracted

Perth-20130930-00260.jpg
An exploded Viscous Coupling....I think this is where the problem began. A new one is now on order.

Gary

Lucky it leaked... Ashcroft used to grind them open as part of the re-con process. - but after the odd one exploded with enough force to travel the workshop they gave it away!

They normally fail in the 100% locked mode, so yours is a rarity.

Certainly is, it's only the third I've heard of.
So the silicon did it's job then, but the weld just wasn't up to it. There must be an amazing amount of pressure in those things!

How did you end up getting the vc off?

Just imagine how capable it's going to be in 4wd....

Originally Posted by superquag

Lucky it leaked... Ashcroft used to grind them open as part of the re-con process. - but after the odd one exploded with enough force to travel the workshop they gave it away!

They normally fail in the 100% locked mode, so yours is a rarity.

I reckon if you has some high speed photography happening when it exploded you could pass it off as a UFO .

Gary

Originally Posted by benji

Certainly is, it's only the third I've heard of.
So the silicon did it's job then, but the weld just wasn't up to it. There must be an amazing amount of pressure in those things!

How did you end up getting the vc off?

Just imagine how capable it's going to be in 4wd....

Benji

The VC came off still jammed inside the housing. Kinda explains why I was having trouble removing the housing. After breaking the initial seal by rotating the housing the first 5mm or so was achieved with some hammer work along with a block of wood. After that it was about an hour of levering with 2 broad blade screw drivers. Once the VC and the housing were off I just used the puller to separate them. I think I spent the majority of yesterday laying on my back under a car . The new VC is on order and with a bit of luck may even arrive on Friday, then I can spend another day under the car reassembling . I'm also going to replace the nylock nuts on the prop shaft with some new ones.

Gary

Gosh, If I'd known how enthusiastic you were, I'd have brought mine up for you to practice on ! p

Philip's suggestion is a good one... Failure of the splines is instant, NO warning at all. I think the chain stretches and rattles around a bit before it takes chunks out of the casing.

Keep us posted.