1985 XJ6 found both rear hubs with surface cracks in exact same position on front of hubs. Ordered two sets of replacements and found identical cracks in same place on all four. Research tells me it is from imperfections in foundry process. Nobody wants cracks but how unsafe are they. Difficult to find hubs without cracks. Would appreciate any input.

 

Hi N8860,

Welcome to the Jaguar Forums! It's great to have you with us.

I have moved your post from the forum for the X300 to the forum for the Series III, which is the common designation for XJ6's manufactured from 1979-1992. Here you will find knowledgeable owners of similar cars.

In the meantime, please visit the New Member Area - Intro a MUST and post a required introduction so we can learn something about you and your Jaguar and give you a proper welcome.

Cheers,

Don

 

Thanks Don for the information concerning new members required introduction.
I have been a member since July 2014 which hardly qualifies me as a
“new member”. My post stated: 1985 XJ6 which is all of the information that I care to and/or wish to give. I am not looking for a social media, I am looking for Jaguar information. No proper welcome needed.
Cheers

 

N8860,

Yes, you have been a member since 2014, but you have made only two posts, neither of which was an introduction. You will find that the forum members who volunteer their time and knowledge will provide friendly assistance in direct proportion to your own friendliness, courtesy and willingness to observe the simple forum guidelines.

Disclose as little or as much as you like, but please visit the the link in my previous post and submit an introduction to prove you are not a troll who should be banned.

Also, please read the forum guidelines at this link:

https://www.jaguarforums.com/forum/n...gned-up-22253/

Cheers,

Don

 

Yes two post because I only had two questions which were answered by friendly, courteous, and willing participants who didn’t require a formal introduction. By all means ban the trolls but not certified members who do not participate in idle chitchat.

 

The cracks may be common (although I've never noticed any on my older Jags) but outright failures seem to be rare in the grand scheme of things.

I surely wouldn't feel comfortable knowing I had cracked hubs.

How visible are the cracks and where are they, exactly? Maybe I haven't been looking closely enough?

Cheers
DD

 

"When in Rome....."

Being a just bit conversational surely can't hurt, though.

I understand what you're saying. But 'willing participants' is a key thing. If you view the group as nothing more than a repository of answers to *your* questions, well, it goes a bit against the grain of the local crowd. There's a strong sense of give-and-take around here.

No ill will meant here; all's well

Cheers
DD

 

Cracks are on front side at bottom on both hubs in exact same spot. Ordered four used replacements and found all four to have same cracks in same place. Was advised this could be a casting imperfection. Most Jag owners don’t see hubs thru solid wheels. Had removed wheel to replace u joint when “cracks” were found. Removed other wheel to find identical “crack”. Searching diligently for used hubs without “cracks”. Only one hub failure on record for Jaguar and this vehicle had been involved in violent prior rear end collision.

 

I'll be taking a closer look at mine. Unnerving.

OTOH....

However, all of these hubs are ages old by now. My non-expert thinking is that formation of cracks and hub failure would follow closely together, if they were to fail at all. IOW, if they were gonna fail, they would've failed. But I'm not metallurgist!

Let's hear what others have experienced

Cheers
DD

 

1. Ditto on the "give and take" comment. precisely the words I had in mind before I read Doug's post.


2. For sure cracks in an important part like a hub are reasons for concern. But rejection, possibly. for investigation, for sure. For repair, mebbe so.


3. Not sure if the Magna flux process would establish the depth of the fissure and as such it's severity. Or merely confirm its existence.


4. Options:


A. Don't worry about it . History and lots of it indicate few if any failures.


B. Stop any spread. Merely drill a small hole at each end of the crack.


C. See a competent alloy welder and let him/her use TIG to seal the cracks.


D. Super caution. Have that TIG welder add straps in alloy across the top of the hub,


I' dimly "recall" that issue eing discussed on J-L. Worth a look, I think.


Carl

 

I'm also kinda concerned by this. After having read the above posts, as I intend on putting about 650+ horsepower to mine. "Cracks can't be good". 650+ horsepower will definitely find the weak link in the chain. I was relieved when the "Nutballs", at "Road Kill" created the Draguar, and XJ sedan, with a blown 350 SBC, and proceeded to spin the tires off the back of it. Not once, but hundreds of times. (go to You Tube and type in Draguar) This gave me confidence in the fact, that the hubs are quite capable, of withstanding a whole lot of abuse. I'm 100% sure they didn't check for cracks??? Just some thoughts.

Jack

 

I wouldn't drive 1 mile with a cracked hub at any HP level.

Here is my hub, which cracked with a 350+ HP Chevy.

The solution is late XJS or XJ40, X300 hubs and 1/2 shafts. The later hubs are re-inforced and have and X brace cast in where the crack usualy occurs.




Further more...when you start applying HP levels over 375 the limitations and issues with the Jag IRS really start present themselves. Throttle steering, cage roll, broken mounts and wheel hop all have to be managed.
Say no to crack!

 

Thank You ICS very much for the pics, and description of the limits of the Jag Irs. As I have found several other good posts on the Irs, and how to reinforce/update the cage, and securing it to prevent the issues you describe. The cracks are something I had never heard about, till now. What year of XJS are you considering a late XJS? Mine are both 89's. Again Thanks

Jack