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blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17885

2007 Defender 110 Puma 2.4 DCPU Stornoway Grey

rear ARB balljoint pins taper angle

Does anyone know the taper angle of the balljoint pins for the rear ARB mounting on a Defender?

I have fitted a genuine take-off ARB to reduce body roll on my DC, which has never previously had one fitted. It works well, but the holes in the brackets welded to the axle casing need opening out very slightly to allow the balljoints to fit perfectly. I suspect that 9 years' worth of rust and crud have reduced them slightly..

I believe that balljoint tapers are usually either 7 or 9 degrees and I just wondered if anyone knew for sure what was used on the Defender before I break out the tapered reamers.

Thanks.

17th May 2016 10:44pm

nickhodgson

Member Since: 08 Dec 2009
Location: Zambia
Posts: 174

Are you using genuine LR ball joints? Because would rust eating away at the taper not eat away at it evenly? 1995 300tdi Defender 90 P/UP
2011 Puma Defender 130 D/C
2000 300tdi Defender 110 P/UP
2015 Discovery 4 SDV6 HSE

18th May 2016 2:40pm

Thon

Member Since: 22 Nov 2015
Location: Salisbury Plain
Posts: 696

If you're stuck you could always measure the ball joint taper with a vernier and calculate using trigonometry.

Just a thought if you were feeling mathematically minded today

18th May 2016 3:28pm

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17885

nickhodgson wrote:
Are you using genuine LR ball joints? Because would rust eating away at the taper not eat away at it evenly?

Yes, genuine, but rust makes a smooth surface un-smooth, so the balljoint pin doesn't go as far into the hole as it should.

thon wrote:
If you're stuck you could always measure the ball joint taper with a vernier and calculate using trigonometry.

Indeed, but the taper is slight, probably around 1 to 1.5 in 12. Measuing this accurately over such a short length (or more specifically, accurately measuring the length between diameters onm a taper) is difficult, and a very slight inaccuracy in the measurement will make a significant error in the calculated angle.

If, as seems likely, no-one knows, I'll either drop a line to someone who makes weld-on brackets in the hope that they'll tell me, or just try some different tapers in a piece of gash plate with engineers' blue until I find the angle. failing that I clear the hole up carefully with a file - it's only an ARB after all, not a steering joint!

I was hoping for the lazy and quick approach - to ask someone!

Thanks all anyway.

18th May 2016 4:16pm

DSC-off

Member Since: 16 Oct 2014
Location: North East
Posts: 1488

2015 Defender 110 Puma 2.2 XS CSW Aintree Green

ARB bush taper spec is 11.42 Degrees inclusive angle, 1 in 10 taper (per side).
Diameter sizes at either side of the bush are 14.27 & 17.42mm

19th May 2016 12:31pm

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17885

^^^^^

Exactly what I needed, very many thanks!

19th May 2016 12:37pm

DSC-off

Member Since: 16 Oct 2014
Location: North East
Posts: 1488

You're welcome.
We don't make them any more, since January.

19th May 2016 8:53pm

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