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Dinnu

Member Since: 24 Dec 2019
Location: Lija
Posts: 3431

2012 Defender 90 Puma 2.2 CSW Santorini Black

^^^ plus the fact that the original bolt is fine thread, so that further increase the clamping force.
I do not know if the M12 is torqued to yield, but a longer bolt will stretch more under the same strain (strain is delta length over original length).

It is also important to know that the bolt we are discussing keeps the internals of the gearbox together. Helical gears impart quite a bit of thrust.

So either the gearbox thrust or my trust is lacking

1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing
2012 90 CSW, 2.2TDCI, Santorini Black

14th Nov 2021 10:13pm

Julie

Member Since: 07 Oct 2017
Location: Nantes
Posts: 502

2012 Defender 110 Puma 2.2 SW Keswick Green

nitram17 wrote:
Julie wrote:
My Ashcroft kit did outlast the original version (i.e. Not lubricated).

This makes me think that lubrifation is a relevant issue

P.S. @nitram17 : One cannot simply drill holes and install grease nipples because thé thing hides inside a housing as you can see at thé beginning of this video

sorry j obviously it would have to be done with the t box and shaft on the bench.

Definitely. But there are two more things that might come up :

1) how to allign the access hole in the housing with the grease nipple
(just for lubrication, not for installation of course

2) the teeth pattern is rather fine. I believe, the pressure for ordinary grease might not lubricate the entier spline

Drilling holes is quite an easy job.

15th Nov 2021 7:17pm

Julie

Member Since: 07 Oct 2017
Location: Nantes
Posts: 502

nitram17 wrote:
Unlikely as the original lasted 86000 miles..... the afflicted ones tent to go around the 12-20 thousand mile mark ............ your right however we don't know who fitted the Ashcroft shaft but what we do know is that the Ashcroft has had several iterations and some have failed..as far as im aware nobody has reported a lof one piece failure or gearbox problems post modification.........I know its early days for the lof but i know which one i would choose at this point in time.

45 K (miles) on an original Ashcroft kit fitted by a JLR garage. Not any issue yet

15th Nov 2021 7:38pm

nitram17

Member Since: 08 Jun 2014
Location: newcastle
Posts: 2261

Julie wrote:
nitram17 wrote:
Julie wrote:
My Ashcroft kit did outlast the original version (i.e. Not lubricated).

This makes me think that lubrifation is a relevant issue

P.S. @nitram17 : One cannot simply drill holes and install grease nipples because thé thing hides inside a housing as you can see at thé beginning of this video

sorry j obviously it would have to be done with the t box and shaft on the bench.

Definitely. But there are two more things that might come up :

1) how to allign the access hole in the housing with the grease nipple
(just for lubrication, not for installation of course

2) the teeth pattern is rather fine. I believe, the pressure for ordinary grease might not lubricate the entier spline

Drilling holes is quite an easy job.

Click image to enlarge

Ian series .... managed it looks ok in the lubrication front to me ..he appears not to be on here anymore as it would be interesting to see how it got on over the five years since he fitted it.

Drilling holes is serious business in my book!

15th Nov 2021 7:44pm

Julie

Member Since: 07 Oct 2017
Location: Nantes
Posts: 502

Yeah, grease nipples would be great if functionality was proven on that spline in that housing

15th Nov 2021 8:03pm

ashtrans
Site Sponsor

Member Since: 08 Nov 2008
Location: Harpenden
Posts: 258

Hi,

I thought I would chime in,

We have never had one of our design wear out to my knowledge,

Some customers with the earlier designs have had to change to outer collars due to oil leak issues but this was on the earlier designs, the later red collars have very few issues, the few that we have had usually have a reason for failure ie installation related, cross threaded or collar coming loose,

FYI as of today we have sold 4669 kits,

Dave Dave

16th Nov 2021 9:00am

nitram17

Member Since: 08 Jun 2014
Location: newcastle
Posts: 2261

Perhaps you could provide us with some extra data nearly 5 thousand kits sold but how many have required the expense of getting access to inspect or repair for leaks? At the moment your main competitor is the lof one piece fix but I'm concerned about wear in the gearbox from this ......but I don't want the expense of whipping of the TC for a leak.its a dilemma that can only be helped with some more data

16th Nov 2021 1:03pm

ashtrans
Site Sponsor

Member Since: 08 Nov 2008
Location: Harpenden
Posts: 258

Good question,

we have issues with maybe 1 in 400 but as mentioned, this is due to installation / fitting issues,

So I would say the question is not, how many leak ? but how many customers install incorrectly,

I don't mean for this to sound arrogant but what I mean is there is always a reason for the leak stemming from an incorrect installation, Dave

16th Nov 2021 1:30pm

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17473

2007 Defender 110 Puma 2.4 DCPU Stornoway Grey

Dave, many thanks for contributing to this thread, it is much appreciated.

Is there an easy way to identify the different versions of your kit? I recently bought an unused and unopened kit from a friend and would be interested to know if it is the latest type, but I am really not sure how to tell.

The female part of the coupling in the kit lacks the two cut-outs for the JLR holding tool, which I think were present on your early kits, so I don't think it is first generation, but I don't know how the seals have evolved.

Any insight would be gratefully received.

16th Nov 2021 1:44pm

nitram17

Member Since: 08 Jun 2014
Location: newcastle
Posts: 2261

ashtrans wrote:
Good question,

we have issues with maybe 1 in 400 but as mentioned, this is due to installation / fitting issues,

So I would say the question is not, how many leak ? but how many customers install incorrectly,

I don't mean for this to sound arrogant but what I mean is there is always a reason for the leak stemming from an incorrect installation,

That's good going only 12 kits have leaked!

So none of the ones you've fitted have leaked?

Last edited by nitram17 on 16th Nov 2021 2:21pm. Edited 1 time in total

16th Nov 2021 2:12pm

nitram17

Member Since: 08 Jun 2014
Location: newcastle
Posts: 2261

Are they not colour coded silver then red for the different versions?

16th Nov 2021 2:15pm

ashtrans
Site Sponsor

Member Since: 08 Nov 2008
Location: Harpenden
Posts: 258

the designs were :

Silver
Blue
Red

on each the inner collar O rings changed to seal better on the inner shaft, on the earlier Silver and Blue designs we naively thought the input gear would be behind the shaft and didn't allow for enough mis alignment so the shaft rubbed against the collar for 180 degrees on the ground sealing diameter as the input gear was holding the shaft to one side.

The red design just gives more clearance and has much bigger O rings to compensate, Dave

16th Nov 2021 3:27pm

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17473

Thank you, I will check my kit to see which it is.

ashtrans wrote:
...we naively thought the input gear would be behind the shaft and didn't allow for enough mis alignment so the shaft rubbed against the collar for 180 degrees on the ground sealing diameter as the input gear was holding the shaft to one side.

I find this statement most interesting, since it tends to confirm my theory that a major contributing factor (probably the major contributing factor) to the failures of the standard parts is misalignment of the transfer box with respect to the gearbox.

16th Nov 2021 5:09pm

nitram17

Member Since: 08 Jun 2014
Location: newcastle
Posts: 2261

ashtrans wrote:
the designs were :

Silver
Blue
Red

on each the inner collar O rings changed to seal better on the inner shaft, on the earlier Silver and Blue designs we naively thought the input gear would be behind the shaft and didn't allow for enough mis alignment so the shaft rubbed against the collar for 180 degrees on the ground sealing diameter as the input gear was holding the shaft to one side.

The red design just gives more clearance and has much bigger O rings to compensate,

deliberately

Sorry fella and im not trying to be awkward, and im only only going by your statements

"we have issues with maybe 1 in 400 but as mentioned, this is due to installation / fitting issues,

So I would say the question is not, how many leak ? but how many customers install incorrectly"

but it sounds as if you admit there were design problems in the earlier versions and not simply as you say the fault of the quality of the fitting by the buyers .

Would you like to clarify?and have you recalled all the silver and blue versions?or st least informed the buyers where possible?

and as blackwolf has said wont your design simply slow down damage due to misalignment rather than cure it..

Is there not a way to design( im clearly not an engineer) a megga strong propshaft (instead of shaft)to cater for the misalignement and split the transfer box in two horizontally so the bottom half of the transfer box can be accessed in situ on the truck and the joint greased or replaced?

Or you could do that with the transfer box with your version as i know i would personally pay for an updated transfer box casing that meant you could have confidence and peace of mind in your truck for a long journey and you could access the output shaft on the truck for inspection and repair of leaks by undoing a few bolts in 20 minutes.

Last edited by nitram17 on 17th Nov 2021 12:11am. Edited 1 time in total

16th Nov 2021 11:02pm

PCM

Member Since: 25 Jan 2019
Location: North East
Posts: 889

2 Puma 2014 110s
Fist one 36k banging and clanging fitted Ashcroft kit, smooth as cream, worked flawlessly until sold 18 months / 15k later. Original Intermediate shaft severely warn.
New one 25k banging and clanging more that the first. LOF one going in on Thursday. No reason to not trust Ashcroft, just want to compare.

Feel both Ashcroft and lof are far far superior to original dry and rusty cap.

16th Nov 2021 11:36pm

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