Autoflock Motorsport
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| posted on 23/8/14 at 02:03 PM |
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quaife atb chain driven diff shat itself
well at Anglesey yesterday the bloomin diff gave up the ghost after only 45 mins of driving. not happy at all but I suppose these things happen. Has
anyone experienced any problems with these? are there any other options out there that maybe more reliable?
any help would be great
Kind regards
Raj
http://www.locostbuilders.co.uk/forum/23/viewthread.php?tid=183445
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minitici
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| posted on 23/8/14 at 04:48 PM |
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Never known a genuine Quaife QDF7ZR sealed chain drive unit fail.
Are you sure it is a Quaife unit?
Perhaps you have a failed CV joint?
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cloudy
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| posted on 23/8/14 at 08:37 PM |
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Is it the one with the reversing mechanism? or the plain QDF7ZR?
www.warnercars.com
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Autoflock Motorsport
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| posted on 2/9/14 at 09:54 AM |
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the diff is the qdf725r unit, im removing it in the next week or so and phil peacock is going to sort it, must admit im not too impressed with it as
its not had hardly any work or stress
Kind regards
Raj
http://www.locostbuilders.co.uk/forum/23/viewthread.php?tid=183445
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cloudy
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| posted on 2/9/14 at 10:04 AM |
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What has failed with it? QDF7ZR is pretty bombproof... has the torque biasing failed? lost drive? or is the problem with the carrier/chain/tensioners?
(which won't be Quaife)
James
www.warnercars.com
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scootz
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| posted on 2/9/14 at 10:25 AM |
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Would be handy to know what exactly has failed!
It's Evolution Baby!
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Autoflock Motorsport
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| posted on 2/9/14 at 10:38 AM |
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thats exactly what I thought which is why im suprised its failed, ive not removed it yet but basically you can put it into gear and the whole diff
unit just rotates with the chain but the input drive shafts stay perfectly stationary. really strange, I was a bit reluctant to speak to quaife
direct so spoke to a few friends in the trade and got in contact with phil, he has been dealing with quaife for 30 odd years and is well know amongth
the motorsport trade for his excellence in transmissions.
I will try and get a vid of whats going on this weekend, once removed I will also upload a ruck of photo's. Hopefully it might just be
something simple, but what ever it is it put a stop to my track action 40mins in at anglesey lol I was not a happy bunny. But did spend the rest of
the afternoon entertained by a mates 400+bhp evo hooning around the coastal
[Edited on 2/9/14 by Autoflock Motorsport]
Kind regards
Raj
http://www.locostbuilders.co.uk/forum/23/viewthread.php?tid=183445
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cloudy
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| posted on 2/9/14 at 12:23 PM |
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Given the construction of the ATB diff it would have to be pretty catastrophic to produce no drive! You'd have to completely strip both output
shaft splines or completely destroy all the helical gears - even then you'd think the debris would jam up the diff
Could it be the sprocket bolts that have sheared? Most impressive if it is the diff, pics would be interesting!
www.warnercars.com
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JimSpencer
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| posted on 2/9/14 at 12:58 PM |
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quote:
Originally posted by Autoflock Motorsport
thats exactly what I thought which is why im suprised its failed, ive not removed it yet but basically you can put it into gear and the whole diff
unit just rotates with the chain but the input drive shafts stay perfectly stationary.
[Edited on 2/9/14 by Autoflock Motorsport]
Hi
Had exactly the failure you describe.
Wasn't the diff itself
There are two very short shafts that go into the output of the diff and feed the drive into your drive flanges, if one of those shears you get exactly
the symptoms you describe
Goggle - Mini LSD Output shaft Pot Joint Type
To see an example of something similar to what you'll possibly be using.
HTH
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Autoflock Motorsport
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| posted on 2/9/14 at 04:15 PM |
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Cloudy - Jim, thank you very much for your comments, I shall defo try and whip the diff off over the weekend and report back with pics!!!
Fingers crossed it will be an easy fix.
jim have you any pics of how you fixed yours?
Kind regards
Raj
http://www.locostbuilders.co.uk/forum/23/viewthread.php?tid=183445
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JimSpencer
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| posted on 2/9/14 at 04:46 PM |
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Hi
No pics as such - but I'll have a go as describing what you should find:-
Your diff, will be held between a pair of mounting blocks.
Each block will have a large bearing in it, which the output's from the diff fit into.
You'll then have a pair of driveshafts on which there will be a joint of some discription at each end.
If you remove the driveshaft(s) (or just undo the diff end if there's enough room to swing it out of the way) you'll be faced with the
diff to driveshaft joint.
The small shaft (it's about 4 - 5 inch long) will be slide fit into the diff outputs and the joint (might be a retainer on the joint side,
isn't normally one on the diff side)
So now remove the joint and pull the shaft out
If it comes out looking like the picture you Googled earlier then it's the other side that's busted 
If it's in Two bits - you've found your problem.
But I would check the other side anyway!
Almost certainly the part in question will be off a Mini (Classic sort) as that's what these diffs evolved from.
Post a pic of the knackered bit and we'll certainly be able to identify it between the folk on here
HTH
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Autoflock Motorsport
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| posted on 2/9/14 at 05:00 PM |
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thank you very much jim, very useful information there. I shall report back shortly :-)
Kind regards
Raj
http://www.locostbuilders.co.uk/forum/23/viewthread.php?tid=183445
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cloudy
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| posted on 2/9/14 at 05:30 PM |
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Driveshafts can just go directly into this diff - the QDF7ZR will take a fiesta driveshaft directly (it's based on a fiesta/escort fitment
diff) (unless you have lobro flanges)
James
www.warnercars.com
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JimSpencer
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| posted on 2/9/14 at 07:45 PM |
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quote:
Originally posted by cloudy
Driveshafts can just go directly into this diff - the QDF7ZR will take a fiesta driveshaft directly (it's based on a fiesta/escort fitment
diff) (unless you have lobro flanges)
James
Hi James
While Autoflock checks what he's got - just out of curiosity how does that work (above) then?
If you just plugged a drive shaft straight into the diff outputs you'd surely just end up with a solid axle if that was the case??
I've always seen the chain drive quaife unit with some form of couplings at the diff mounting end - unless it's been fitted in one of
those cart like buggies I suppose??
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cloudy
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| posted on 2/9/14 at 10:30 PM |
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This is the inboard side on a fiesta shaft - no need for adapters, CV + splines are one unit - much lighter that way 
www.warnercars.com
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Autoflock Motorsport
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| posted on 3/9/14 at 09:40 AM |
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quote:
Originally posted by cloudy
This is the inboard side on a fiesta shaft - no need for adapters, CV + splines are one unit - much lighter that way
interesting, would these not have a different length though to my current setup? I like the sound of "lighter"
Kind regards
Raj
http://www.locostbuilders.co.uk/forum/23/viewthread.php?tid=183445
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cloudy
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| posted on 3/9/14 at 10:20 AM |
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You would almost certainly need new lengths making up ...
www.warnercars.com
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Nick Skidmore
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| posted on 3/9/14 at 10:25 AM |
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If your diff is relatively new they have a lifetime warranty from Quaife - call them if you have your receipt.
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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Autoflock Motorsport
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| posted on 3/9/14 at 11:47 AM |
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quote:
Originally posted by Nick Skidmore
If your diff is relatively new they have a lifetime warranty from Quaife - call them if you have your receipt.
Hello Nick,
this was purchased a good while ago and through a third party so no receipt from quiafe themselves to my knowledge, but hopefully the fault is with
the small couplings.
On another note, ive just google your car.
WTF?
Have you got any pics or build thread? those machines look amazing
Kind regards
Raj
http://www.locostbuilders.co.uk/forum/23/viewthread.php?tid=183445
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Nick Skidmore
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| posted on 3/9/14 at 01:14 PM |
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Which car?
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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JimSpencer
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| posted on 3/9/14 at 01:46 PM |
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quote:
This is the inboard side on a fiesta shaft - no need for adapters, CV + splines are one unit - much lighter that way
Hi
Ah, Ok with you, on Raj's instal the only difference is that it comes to bits - that fiesta Shaft will still have the small coupling shaft
internal to it somewhere - it's doing the same job.
If you Google a Mini 'Pot Joint' you'll see something that looks remarkably similar to the Fiesta joint, takes the driveshaft input
on one side and the coupling shaft on the other - painted the lot black it'd look the same more or less
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Autoflock Motorsport
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| posted on 4/9/14 at 10:27 AM |
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quote:
Originally posted by Nick Skidmore
Which car?
tautaus fr2000
Kind regards
Raj
http://www.locostbuilders.co.uk/forum/23/viewthread.php?tid=183445
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Autoflock Motorsport
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| posted on 1/10/14 at 12:11 PM |
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Quick one jim
if only one of these small couplings has failed would it still mean thr whole diff unit will simply spin and give no drive to either wheel?
I have not had time to take it apart yet but I am hoping to go on track this weekend, I have one spare coupling so if it is only one at least I can
have a blast at the weekend.
Kind regards
Raj
http://www.locostbuilders.co.uk/forum/23/viewthread.php?tid=183445
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JimSpencer
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| posted on 1/10/14 at 12:18 PM |
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quote:
Originally posted by Autoflock Motorsport
Quick one jim
if only one of these small couplings has failed would it still mean thr whole diff unit will simply spin and give no drive to either wheel?
I have not had time to take it apart yet but I am hoping to go on track this weekend, I have one spare coupling so if it is only one at least I can
have a blast at the weekend.
Hi
Yes that's exactly the symptoms you get, the diff unit will simply rotate, no drive - mine went on the line at Loton back in August, now carry a
couple of spares
HTH
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Autoflock Motorsport
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| posted on 3/10/14 at 10:00 AM |
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well small update, massive thanks to Jim for his diagnosis, it was bang on the money. The small input shaft coupling has sheared streaght off, but
suprised really as it is very hard steel and has also been case hardened.
Here is a few pics of the broken part and the replacement, im just taking measurements to get some more made up and also making a puller to get the
couplings out of the diff
Fingers crossed it should all be sorted by tonight
[Edited on 3/10/14 by Autoflock Motorsport]
Kind regards
Raj
http://www.locostbuilders.co.uk/forum/23/viewthread.php?tid=183445
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