Jag rear axles/hubs

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KevinW
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Jag rear axles/hubs

Post by KevinW »

I have a set of knock-on rear adaptors to fit to replace the standard XJ6 items.
Having looked in the Haynes manual and many YouTube videos I was hoping my local classic car garage would just wave a magic wand over it, as I don't own a press and I don't have the right Jag parts to re-assemble the upright onto the lower wishbone. He politely declined the job as he didn't have the correct Jag service items. So I am back to square one and rather dreading taking this on.

Any top tips from anyone who has assembled a Jag hub or replaced for a knock-on hub would be appreciated.
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kdavies3
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Re: Jag rear axles/hubs

Post by kdavies3 »

Hi Kev, are they adapters or actual replacement peg drive flanges?
Kev Davies
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StuBaker
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Re: Jag rear axles/hubs

Post by StuBaker »

Hi Kevin,
If you're fitting new hubs you'll need a few things.
Basically on assembly you need to have the correct amount of endfloat. That is enough play to allow the bearing to warm up without seizing.
So, you'll need a set of shims. (SNG Barrat) and preferably new bearings and seals and seal ring. A dial gauge with magnetic base or clamp.
An hydraulic press will be a bonus but I bought a set of bearing race assembly dies to use with a hammer. It is essential to press/hammer the correct part of the bearing on assembly so not to damage the rollers.

You preassemble the hub with an over size set of shims to correct torque and measure endfloat with a dial gauge then calculate correct shim dimensions to give the desired endfloat. I.E. remove some shims.
It takes time but is very satisfying when you get the right numbers.
So, you need:
New bearings and seals (may as well start off with new!)
Shims
Bearing assembly kit. (I used SWE 063)
Hydraulic press OR dead blow hammer
The endfloat is something like - from E-Type jag manual - 0.025 to 0.076 mm (0.001 to 0.003 in.)
(Max endfloat is 0.127mm (0.005 in.) before remedial action is necessary on old assemblies)
I wish i had used an hydraulic press, would have been much easier and quicker.
I think Ward engineering would do it but not sure of the cost.
If i had struggled I'd have gone to our local E Type specialist...
A local machine shop should have all the gear required, and some knowledge of hub assembly.
Don't be tempted to just replace hubs using all the old bearings and shims, the hubs are bound to be slightly different in length. Unless you can measure them accurately of course.
Hope that helps a bit,
Cheers,
Stu
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Re: Jag rear axles/hubs

Post by StuBaker »

Hi Kevin,
I've added a copy of the hub assembly from the E-Type manual. Note the use of a mandrel instead of extra shims. (3.81mm or 0.150 in.)
Stu
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KevinW
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Re: Jag rear axles/hubs

Post by KevinW »

kdavies3 wrote: Thu Jun 04, 2020 7:25 pm Hi Kev, are they adapters or actual replacement peg drive flanges?
Hi Kev,
Its a pair of Simon peg drives - see pic.
Kev
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KevinW
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Re: Jag rear axles/hubs

Post by KevinW »

Thanks for your replies.

Unfortunately when I bought these I was told just use a puller to extract the old hub, fit a new bearing and hammr new hub back in. Don't think that'll work. It sounds like this is impossible to do in-situ, and requires removal of the hub carrier assembly - is this correct?

If so, how do you get round the issue of needing to re-assemble the hub carrier to the wishbone? The videos I have seen show a dummy piece of bar being hammered through to keep all the shims in place...again which i don't have.

TBH I could also just get the local machine shop to machine off the entire rear spline metalwork and treat them as bolt-on adaptors.
StuBaker
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Re: Jag rear axles/hubs

Post by StuBaker »

I've seen them hammered in on a TV program, made me cringe a bit. I wouldn't rush out to buy that car. (Maybe they edited it out?)
This is one of those jobs that needs doing properly. If your not sure take it to a professional.
The pivot needs similar setting up but for preload and it is a bit fiddly but a piece of rod helps with assembly.
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Re: Jag rear axles/hubs

Post by 289 Mk111 »

Kevin , Cheng at Thunder road cars assembled mine, he also set up the suspension - If you get stuck worth considering?

Steve
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