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Nissota 9" into Rover

Tech Talk for Rover owners.

Moderator: Micka

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Post by napsta »

is there not a known weakness of using an ARB in a 9 inch? Not in the design of the ARB but fitting it in a 9 inch? I think alot of the crawler guys over there are having problems with them, especially when 'crash' locked or used with cutting brakes?
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Post by ashtrans »

Hi,

we make 4 mods to the 9" ARB RD99,

1) to fit to our new housing we have to machine the ARB on the non crown wheel side to pull the journal bearing in closer to the centre,

the other 3 mods are to improve the poor dog clutch engagement,

2) there are 12 small but strong disengagement springs, this is a huge force for the pneumatic piston to overcome on engagement, we remove 4.

3) the dog clutch only has 2.5mm engagement, we machine it to add 1mm more.

4) the internal air feed holes are 1mm, we open these up to 1.5mm.

not tested any of the above yet but hopefully it will improve the problems the 9" ARB suffers from.
Dave

www.ashcroft-transmissions.co.uk
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Post by ISUZUROVER »

ashtrans wrote:Hi,

we make 4 mods to the 9" ARB RD99,

1) to fit to our new housing we have to machine the ARB on the non crown wheel side to pull the journal bearing in closer to the centre,

the other 3 mods are to improve the poor dog clutch engagement,

2) there are 12 small but strong disengagement springs, this is a huge force for the pneumatic piston to overcome on engagement, we remove 4.

3) the dog clutch only has 2.5mm engagement, we machine it to add 1mm more.

4) the internal air feed holes are 1mm, we open these up to 1.5mm.

not tested any of the above yet but hopefully it will improve the problems the 9" ARB suffers from.
Great info Dave. I'm sure you have your own ARB contacts, but daniel bongard (dbongard) on here is an ARB engineer...
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Post by Slunnie »

ISUZUROVER wrote:
ashtrans wrote:Hi,

we make 4 mods to the 9" ARB RD99,

1) to fit to our new housing we have to machine the ARB on the non crown wheel side to pull the journal bearing in closer to the centre,

the other 3 mods are to improve the poor dog clutch engagement,

2) there are 12 small but strong disengagement springs, this is a huge force for the pneumatic piston to overcome on engagement, we remove 4.

3) the dog clutch only has 2.5mm engagement, we machine it to add 1mm more.

4) the internal air feed holes are 1mm, we open these up to 1.5mm.

not tested any of the above yet but hopefully it will improve the problems the 9" ARB suffers from.
Great info Dave. I'm sure you have your own ARB contacts, but daniel bongard (dbongard) on here is an ARB engineer...
Product development supervisor for the Airlockers and compressors at that!
Cheers
Slunnie

Discovery TD5, Landy IIa V8 ute.
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Post by ashtrans »

few update photos for you guys,

Image
Image
Image
Image
Image

it's slow process but it's definatly getting there,

these newer knuckle inners are solid steel, the outers are solid flange and twin caliper flanges with fabricated sides,

seal and needle roller bearings on CV
Dave

www.ashcroft-transmissions.co.uk
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Post by Micka »

So are the inner knuckles a bolt on or weld on?

Looks very heavy duty. Top work, guys.
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Post by ashtrans »

they bolt on,
Dave

www.ashcroft-transmissions.co.uk
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Post by Slunnie »

Is this a full bolt up conversion with the Rover axle that requires no fabrication etc?
Cheers
Slunnie

Discovery TD5, Landy IIa V8 ute.
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Post by ISUZUROVER »

double post...
Last edited by ISUZUROVER on Mon Jun 08, 2009 1:30 am, edited 1 time in total.
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Post by ISUZUROVER »

Slunnie wrote:Is this a full bolt up conversion with the Rover axle that requires no fabrication etc?
Well at the very least you need to cut off the pan and weld a new one on...

Thanks for posting the pics Dave, looks great!!!

Am I seeing it right, that you need to bolt the centre casing to the housing, then install the pinion???
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Post by Micka »

ISUZUROVER wrote:
Slunnie wrote:Is this a full bolt up conversion with the Rover axle that requires no fabrication etc?

Am I seeing it right, that you need to bolt the centre casing to the housing, then install the pinion???
Think so, Ben.

Would make it REALLY hard to get to the other 2 or 3 nuts and bolts for the centre casing.
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Post by LOCKEE »

Better than having to put in the oval section required by traditional 9 inch housing.
:rofl: :popcorn: :snipersmile:
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Post by ashtrans »

ISUZUROVER wrote:
Slunnie wrote:Is this a full bolt up conversion with the Rover axle that requires no fabrication etc?
Well at the very least you need to cut off the pan and weld a new one on...

Thanks for posting the pics Dave, looks great!!!

Am I seeing it right, that you need to bolt the centre casing to the housing, then install the pinion???
Yes it will need a new pan/sewercap fitting,

the diff can be fitted complete with the pinion, we just didn't have one made up when we took the photos,
Dave

www.ashcroft-transmissions.co.uk
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Post by ashtrans »

ashtrans wrote:
ISUZUROVER wrote:
Slunnie wrote:Is this a full bolt up conversion with the Rover axle that requires no fabrication etc?
Well at the very least you need to cut off the pan and weld a new one on...

Thanks for posting the pics Dave, looks great!!!

Am I seeing it right, that you need to bolt the centre casing to the housing, then install the pinion???
Yes it will need a new pan/sewercap fitting,

the diff can be fitted complete with the pinion, we just didn't have one made up when we took the photos,
sorry, got that wrong, on this later design yes the diff casing will need fitting to the axle then the pinion fitting to the casing
Dave

www.ashcroft-transmissions.co.uk
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Post by nottie »

I think i just got a hard on when i seen those pics. :lol:
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Post by ashtrans »

video of the first test run here :

video

we were very pleased, the ticking is the CV boot clip fouling, now fixed, the diff was silent and the oil feed to the pinion bearings worked well,

should be on a car for real testing very soon,
Dave

www.ashcroft-transmissions.co.uk
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Post by Slunnie »

Dave that is looking excellent!!!! Nice testing bench by the way!!!!


http://www.youtube.com/watch?v=nwaU_fqhk3I
Cheers
Slunnie

Discovery TD5, Landy IIa V8 ute.
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