Problem with McNamara diff

[trampdani]

Hello Guys

It is now already a bit to long ago. I bought for our big trip a McNamara Difflock. That is almost 3 years ago. We are still travelling but we never could use the difflock (or better never had to). What I did was changing the rubber thing in the activator (diaf.....things). I'm glad to read in your forum that JackMac is what of the best and customer service wasn' t to bad until a year ago. Jack even promised a new activator style_emoticons/<#EMO_DIR#>/biggrin.gif . Promised as I said. Since then not a lot style_emoticons/<#EMO_DIR#>/sad.gif .
Now it seams I have to help myself. Has anybody of you the vaccum activated typ (Salisbury axel rear)? Did anybody had trouble? And what did you do against it?

Thanks for your help

Daniel

[D110V8D]

I think you'll find that persistance is the only way to get anything out of Jac Mac.

Send email, call and then call again and email again.

If you pester him enough he will respond.

[trampdani]

Well, that would be the way I will do as soon as I'm home again. At the moment it is a bit hard to get something without an adress. On the other hand is Jack willing to send me some more rubberthings, but I'm not willing to change them all 1000 km to be sure my difflock is working.
But I will keep trying. In the meantime I just like to find out if there are more people with brocken rubberthing and why it happend and what they did against it.

Thanks anyway

best wishes from Salta, Argentina

Daniel

[p38arover]

If you can get Jack to send what you need to Buenos Aires, I have a mate who lives there. He's a long time Land Rover owner having owned a couple of Series IIAs from the late 60's until earlier this year when he moved from Queensland to Argentina.

Charlie and I have been friends since we first met on 20th Jan 1965 (I remember the date as it was my birthday) when we both started work as trainee technicians with OTC.

Ron

[DEFENDERZOOK]

<span style="color:blue">thats also my mums birthday.....</span>

[p38arover]

Can I take her out to dinner?

Ron

[Grizzly_Adams]

Oh dear, it's my birthday also (though not the year!)

[p38arover]

I'm not taking you out for dinner! style_emoticons/<#EMO_DIR#>/smile.gif

I just remembered, it's my sister's birthday, too (and I'm not taking her out for dinner either).

Ron

[trampdani]

Ok, Guys, my birthday is far from it, so back to buisness.
I won't start e-mailing jack or jeff again for parts. They will send me only this rubberthing (plenty of them). I would rather like to know what is wrong. I imagine it pretty unpleasent to stick in kneedeep mud and to find out my difflock needs a change of this rubberthing.
But it seems there are only happy JackMac difflock driver around in australia. :?

Best wishes from Argentina

[p38arover]

What is this rubber thing?

Ron

[trampdani]

It is that thing, that divides the two halfs of the activator. And putes back the piston which locks the diff. And this "thing" causes all the problem. After around 1000-2000 km it breacks at the outer diameter and lets aire passe. After that, it is good for nothing.

Best wishes

Daniel

[trampdani]

Just to pull it up

Is there nobody out here who has a JackMac diff. Or all the one's who have one never ever had problems?
It can't be I'm the only one

I will a difflock that is working :x

Greetings

Daniel

[HSVRangie]

Brother had one in his 4x4 no issues with it.

sounds like its over stroking and tearing the rubber.?????

M

[rangieman]

i have a jmac diff and axles but mine are open no locker no probs 3 years service and 2 cars latter style_emoticons/<#EMO_DIR#>/laugh.gif

[trampdani]

Originally posted by HSVRangie
Brother had one in his 4x4 no issues with it.

sounds like its over stroking and tearing the rubber.?????

M

Is there a possibilety, that my vacum pump not keeps the vacum constant and so keeps the piston in constant movement?
Can I do something against it?

Greetings still from Salta
Daniel