Nickp
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| posted on 23/5/17 at 05:13 PM |
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First day on the road!! Good, the bad and the noisy diff!!
Well, let's start with the good-
Got an email from DVLA this morning to say I was road legal and good to go, oh and I don't have to MOT again for 3yrs!!
So out I went and OMG this thing is quick!! It spins up everywhere in 2nd even on the dry sticky roads today and then it proceeds to pull your face
off in 3rd!! Just bonkers!!  Gearing is great now with the new 3.14 diff seeing just 3500rpm at 75mph.
Then came the bad-
After a few miles the diff started to scream like I' had a straight cut box!! 
My 3.62 diff was fine before when I went for the IVA. I've used the LSD diff from that c/w its bearings and bearing holders. I then bolted on
the 3.14 crownwheel. I used the 3.14 pinion and its casing and fitted a new seal, bearing feels and sounds OK on this tbh. I set up the backlash and
preloaded the side bearings as per the Ford manual.
I suspect the problem can only be the pinion bearings but I don't have the tools to strip this. Anyone have these? Or know a company (preferably
local to Barnsley) that does? I'm limited for time as there's a Blyton trackday looming!!
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CosKev3
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| posted on 23/5/17 at 05:27 PM |
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You did put oil in it????
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Nickp
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| posted on 23/5/17 at 05:32 PM |
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quote:
Originally posted by CosKev3
You did put oil in it????
Ha ha, yeah 1ltr of 75w90 semi sync.
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Nickp
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| posted on 23/5/17 at 06:59 PM |
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Think I might just throw the 3.62 back together for now, which is a shame as I've put a lot of time and effort to get the 3.14 in there
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r1_pete
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| posted on 23/5/17 at 07:50 PM |
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quote:
Originally posted by Nickp
quote:
Originally posted by CosKev3
You did put oil in it????
Ha ha, yeah 1ltr of 75w90 semi sync.
Was it oil specifically for limited slip diffs though??
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CosKev3
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| posted on 23/5/17 at 07:52 PM |
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I had mine converted to a 3.38,but got a ex Brooklyn Ford tech to do the job as I wasn't confident and he had done loads back in the day of the
Cosworths 
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CosKev3
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| posted on 23/5/17 at 07:53 PM |
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quote:
Originally posted by r1_pete
quote:
Originally posted by Nickp
quote:
Originally posted by CosKev3
You did put oil in it????
Ha ha, yeah 1ltr of 75w90 semi sync.
Was it oil specifically for limited slip diffs though??
You don't need it in Sierra LSD's 
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Nickp
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| posted on 23/5/17 at 08:02 PM |
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Just been comparing the pinions on the 2 diffs. The noisy 3.14 one feels like it has no preload and spins far too freely for my liking even though it
feels smooth enough. Wonder if this is the issue? I'd like to strip it to inspect the bearings 'reclaim' the crush spacer and see if
I can get some preload on it, but I can't do any of this without some suitable tools
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spiderman
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| posted on 23/5/17 at 10:50 PM |
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I know when reassembling a Triumph diff that the backlash is halved if using used bearings as opposed to new.
Spider
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Nickp
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| posted on 24/5/17 at 07:15 AM |
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Gonna try a couple of local transmission specialists to see if they have the tools to strip the pinion shaft to inspect and set it up. If not the 3.62
will be going back in tonight and get the 3.14 sorted later. Shame, but time and money are at a premium at the moment
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40inches
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| posted on 24/5/17 at 08:07 AM |
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Do you have a complete 3.6 diff? If not I have one you can have, it was being used behind the 3litre Jag engine until I fitted the 3.3.
It's an open diff, push in shafts.
[Edited on 24-5-17 by 40inches]
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Nickp
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| posted on 24/5/17 at 08:26 AM |
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quote:
Originally posted by 40inches
Do you have a complete 3.6 diff? If not I have one you can have, it was being used behind the 3litre Jag engine until I fitted the 3.3.
It's an open diff, push in shafts.
[Edited on 24-5-17 by 40inches]
Thanks, yes I've got the 3.62 lsd I took, just need to put it back together.
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Nickp
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| posted on 24/5/17 at 11:12 AM |
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Well, it's knackered!!
Just took it along to M&T TRANSMISSIONS in Sheffield and straight away they noticed water damage to both the crownwheel and pinion which has
caused pitting to the drive surfaces. They've declared it completely unusable and I'm gutted at all the time and effort I've put
into this swap.
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40inches
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| posted on 24/5/17 at 11:54 AM |
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quote:
Originally posted by Nickp
Well, it's knackered!!
Just took it along to M&T TRANSMISSIONS in Sheffield and straight away they noticed water damage to both the crownwheel and pinion which has
caused pitting to the drive surfaces. They've declared it completely unusable and I'm gutted at all the time and effort I've put
into this swap.
This is common, don't know why. As if they have been stood in water
I had to go through 4 diffs before I found one not water damaged! There is a definite line at the water level.
I think the water damage is above the oil level if the diff has been unused for a long time.
This one was working ok, just a bit of whine.
 
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Nickp
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| posted on 24/5/17 at 12:03 PM |
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quote:
Originally posted by 40inches
quote:
Originally posted by Nickp
Well, it's knackered!!
Just took it along to M&T TRANSMISSIONS in Sheffield and straight away they noticed water damage to both the crownwheel and pinion which has
caused pitting to the drive surfaces. They've declared it completely unusable and I'm gutted at all the time and effort I've put
into this swap.
This is common, don't know why. As if they have been stood in water
I had to go through 4 diffs before I found one not water damaged! There is a definite line at the water level.
I think the water damage is above the oil level if the diff has been unused for a long time.
This one was working ok, just a bit of whine.
Yeah probably condensation I guess but they were 100% sure this CWP was totally unusable
Hopefully a full refund won't be an issue as it was an LCB member that seemed spot on.
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