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AU Falcon IRS pac nuts 

 

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 Post subject: AU Falcon IRS pac nuts
Posted: Wed May 22, 2013 7:13 pm 
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Joined: 11th Dec 2004

Ride: AUIII XR8

Location: Melbourne
VIC, Australia

Just replaced the rear bearings and hubs on the AU3 XR8 independant rear suspension.
The Ford workshop manual advises to discard and replace the Pac Nuts.

The original nuts have been used twice so thought I would take the manuals advice and replace them.

Rang Bayford spares and they advised that the pac nuts are now obsolete and they do not carry them.
Rang around Repco and such and no joy.

On eBay they list Front pac nuts but they advise that fronts are different to rears.

Would prefer not to use the nuts a third time....

Anyone had any solution or suppliers of these nuts ??
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 Post subject: Re: AU Falcon IRS pac nuts
Posted: Wed May 22, 2013 10:03 pm 
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Ride: 1993 EB XR8

Location: BrisVegas
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BA/F Packnuts are the same.

 

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 Post subject: Re: AU Falcon IRS pac nuts
Posted: Wed May 22, 2013 11:29 pm 
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Ride: AUIII XR8

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Thanks, I'll check that out tomorrow.
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 Post subject: Re: AU Falcon IRS pac nuts
Posted: Thu May 23, 2013 7:26 pm 
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OK, I think I have my answers:-

1. The PacNuts front and back are the same physical size, however, their innards are different.
The innards of the front PacNut has 4 plates where each is the same thickness.
The innards of the rear PacNut has 4 plates as well but 2 are thick and account for 2/3 of the space in the cage and the other two are thin and occupy about 1/3 of the space inside.

2. The threads on front and rear axles are 24mm x 2.0mm.

3. They are definitely a single use item.
In subsequent uses their holding capacity is severely reduced (this according to the developer of the nuts).
Not a dangerous issue on the rears ... it would result in stuffed bearings and hubs and a lot of noise if they became loose.
On the front, however, one could loose the front left wheel.

4. The Ford workshop manual tools section nominates a 35mm socket.
I measured my nuts (yes, I know how that sounds!) before I had a copy of the manual and I measured 35.5mm so I bought a 36mm socket. A 35mm socket would be a tight fit but my 36mm works just as well as it is a single hex. If one was to use a double hex socket then I would suggest that a 35mm one would be best.
Given the torque spec (325nm rear and 305nm front) I would suggest an impact socket would be preferred and they are all single hex.
It could be that a tight fitting socket (i.e. the 35mm) may be a requirement for correct operation of the nut ... I am uncertain of that at this time.
If you were going out to buy a socket then the 35mm would be the one to get.

5. The rear nuts are still available as part number ER 1138 F ($38.76 each incl GST)... the guy at Bayford was wrong.
Bought some today from another Ford dealer.

6. On eBay one can buy front PacNuts for around $10 to $15... there are lots of sellers of these hence the competitive pricing.
One of the sellers I contacted advised that they would be listing the rear nuts soon and at $65 each !
If some of the other guys decide to sell these then competition will drive the price down.
In the meantime, get them from Ford.
The fronts from eBay were absolutely identical to the rears from Ford (other than the innards).

7. There appears to be only one supplier of PacNuts. OEM Fastening Systems.
I have requested more info from them, just for my own edification.
The two thicker plates in the rear nuts would allow for higher tightening torque, but, one would want a stronger resistance to loosening on the front.
The manual states that the rear torque spec is 325nm +/- 25nm (300 to 350 range)
I would like to understand why the different nuts were specified between front and rear as the torques front and rear are so close (i.e. why not be able to use front nuts on the rears)?.
Only thought, at the moment, is hardness of the axles where the fronts may be a harder steel than the rears hence a wider plate in the nut is required for the rears and that the narrower plates in the front nuts could damage the thread on the rear stubs ??.

8. PacNuts must not be tightened with a rattle gun.

I have requested info from OEM Fasteners on the versions of the 22x2.0 and am hoping that will shed some light on the AUs use of different versions.
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