Johneturbo
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| posted on 6/10/11 at 02:08 PM |
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3.14 open diff to lsd
Just been thinking of my next winter upgrades as the car is now sorn'd 
I'm currently running a 7" 3.62lsd and i have a 7" 3.14 open diff in the garage so i'd like to turn that into a 3.14 lsd
the ZX14 really need a taller diff
i've done some searches on here and from what i've read, the easier option is to remove the lsd from the 3.62 and fit it to the 3.14?
does anyone have a step by step guide? is it do-able with little knowledge of diffs, do i need any "special tools" i've seen one on
ebay for undoing the bearing casulated nut thingys
any advice before i ruin two good working diffs
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fesycresy
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| posted on 6/10/11 at 02:30 PM |
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Send it to Road and Race Transmissions, Phil did mine.
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The sooner you fall behind, the more time you'll have to catch up.
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Johneturbo
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| posted on 6/10/11 at 02:40 PM |
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Ok thanks that's an option i guess 
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mcerd1
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| posted on 6/10/11 at 02:54 PM |
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here's the sierra diff manual....
http://i5.photobucket.com/albums/y170/mcerd1/page01.jpg
http://i5.photobucket.com/albums/y170/mcerd1/page02.jpg
http://i5.photobucket.com/albums/y170/mcerd1/page03.jpg
http://i5.photobucket.com/albums/y170/mcerd1/page04.jpg
http://i5.photobucket.com/albums/y170/mcerd1/page05.jpg
http://i5.photobucket.com/albums/y170/mcerd1/page06.jpg
http://i5.photobucket.com/albums/y170/mcerd1/page07.jpg
http://i5.photobucket.com/albums/y170/mcerd1/page08.jpg
http://i5.photobucket.com/albums/y170/mcerd1/page09.jpg
http://i5.photobucket.com/albums/y170/mcerd1/page10.jpg
http://i5.photobucket.com/albums/y170/mcerd1/page11.jpg
http://i5.photobucket.com/albums/y170/mcerd1/page12.jpg
http://i5.photobucket.com/albums/y170/mcerd1/page13.jpg
http://i5.photobucket.com/albums/y170/mcerd1/page14.jpg
http://i5.photobucket.com/albums/y170/mcerd1/page15.jpg
http://i5.photobucket.com/albums/y170/mcerd1/page16.jpg
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Johneturbo
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| posted on 6/10/11 at 03:09 PM |
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thanks for the links, nice to see what it looks like once taken apart
does seem there are rather a lot "special tools" though :/
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mark chandler
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| posted on 6/10/11 at 05:29 PM |
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Easy to do yourself, the only hard bit is undoing the ends but someone was selling a tool on Ebay to mesh for £20, I just laid a rod across the top
after soaking overnight in penetrating oil, had to warm the outside where the threads are as well with a blow torch to get moving.
The pinion bolt is deep, I purchased a cheap shallow impact socket from Halfords, cut in half and welded a short piece of scaffold tube to space,
voila super deep socket.
Being locost I just purchased the seals, reused the bearings and adjusted by hand.
Install the pinion and tighten up until all endfloat has gone, install the crownwheel and twiddle in the sides until the crown starts to bind then
backed off a couple of notches, then wind the crown wheel into mesh turning both sides evenly with the pinion until you can feel it starting to bind
then back off a tad.
Regards Mark
[Edited on 6/10/11 by mark chandler]
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Johneturbo
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| posted on 6/10/11 at 07:20 PM |
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Hey Mark
As i'm just putting the lsd into the 3.14 will i also be adjusting/removing the pinion
i thought it was a case of removing the outer casulated bearing housing then removing the crownwheel/housiing then fitting the lsd to the crownwheel
then re-assemble
i've seen the tool you're talking about on ebay
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blakep82
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| posted on 6/10/11 at 07:25 PM |
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pretty sure you need to change the pinion too! not just adjust.
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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Johneturbo
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| posted on 7/10/11 at 01:42 PM |
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Like i've said i'm no expert on diffs...but am i not just unbolting the lsd from the crownwheel of the 3.62 and bolting onto the 3.14
crownwheel? like this section here
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Liam
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| posted on 7/10/11 at 03:47 PM |
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quote:
Originally posted by Johneturbo
Like i've said i'm no expert on diffs...but am i not just unbolting the lsd from the crownwheel of the 3.62 and bolting onto the 3.14
crownwheel? like this section here
That's what I have always heard - no need to mess about with the pinion. You're sticking the LSD mechanism into the existing 3.14 diff
basically. Just need to get the sidewaysness set up right by twiddling the castly things.
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blakep82
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| posted on 7/10/11 at 03:56 PM |
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quote:
Originally posted by Liam
quote:
Originally posted by Johneturbo
Like i've said i'm no expert on diffs...but am i not just unbolting the lsd from the crownwheel of the 3.62 and bolting onto the 3.14
crownwheel? like this section here
That's what I have always heard - no need to mess about with the pinion. You're sticking the LSD mechanism into the existing 3.14 diff
basically. Just need to get the sidewaysness set up right by twiddling the castly things.
but his existing diff is a 3.62 LSD he wants a 3.14 LSD made from the LSD and his open 3.14.
IF the 3.14 is in a fully built ready to go case, then take the LSD out of one and put it in the 3.14
IF he's just got the open 3.14 on its own, his existing 3.62 diff and casing will need the gears taken out and the pinion and crownwheel
transplanted
whatever the situation, the end result will need to have a 3.14 pinion and crownwheel. i've possibly just confused things by misunderstanding
exactly what parts you have but i wouldn't want you trying to get a 3.14 crown wheel working with a 3.62 pinion!
[Edited on 7/10/11 by blakep82]
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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Johneturbo
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| posted on 7/10/11 at 10:35 PM |
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Ok sorry maybe i confussed things by saying open 3.14 what i meant was open as in none lsd, not parts on the bench! its a fully working 3.14 as
i've run it in the car before.
So hopefully it will be just as Liam says fit the lsd portion to my 3.14
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snapper
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| posted on 8/10/11 at 06:21 AM |
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Pinion and crown are matched, even if the pinion has the same teeth they won't mesh properly.
Most will have a different pinion tooth count as well as different crown tooth count.
If you swap, swap the matched pair.
I eat to survive
I drink to forget
I breath to pi55 my ex wife off (and now my ex partner)
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Liam
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| posted on 8/10/11 at 10:55 AM |
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Aarrgghh!! Look - it's really simple, folks!! (isn't it?)
The LSD mechanism from his 3.62 LSD goes into his 3.14 open diff. The end.
So the final result is the 3.14 case with the 3.14 pinion still in it (still setup - completely untouched), then the 3.14 crownwheel is still in there
only now it has the LSD mechanism bolted to it rather than the open mechanism. Finally the drive flanges from the 3.62 are also inserted and clipped
in.
Simples. No need to disturb the pinion shimming at all. All that is needed is to set the crownwheel mesh by adjusting the castley things.
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DixieTheKid
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| posted on 8/10/11 at 11:16 AM |
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While we are on this subject........
Do the output flanges have to be the same for each diff i.e. lobro / push in?
Do the diffs have to be the same size i.e. both 7.5"?
[Edited on 8/10/11 by DixieTheKid]
COS IT'S Worth IT
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blakep82
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| posted on 8/10/11 at 12:20 PM |
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quote:
Originally posted by Liam
Aarrgghh!! Look - it's really simple, folks!! (isn't it?)
The LSD mechanism from his 3.62 LSD goes into his 3.14 open diff. The end.
So the final result is the 3.14 case with the 3.14 pinion still in it (still setup - completely untouched), then the 3.14 crownwheel is still in there
only now it has the LSD mechanism bolted to it rather than the open mechanism. Finally the drive flanges from the 3.62 are also inserted and clipped
in.
Simples. No need to disturb the pinion shimming at all. All that is needed is to set the crownwheel mesh by adjusting the castley things.
yeah, you're right, my mistake! (as i thought you had a 3.14 without case)
so yes, work away! sorry! just wanted to make sure you didn't get yourself in any trouble with wring gears and stuff
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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Johneturbo
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| posted on 20/10/11 at 02:15 PM |
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I thought i'd do a quick update i've now got my 3.14 built up with the LSD fitted the hardest job was undoing the castlelasted bearing
housing side the 3.62lsd was a real bugger to get loose
I made up this tool not my idea i stole it from a website works a treat, its just a 3" oil filter socket with a 8mm studding i did weld on a
19mm nut, as i found the small 3/8 socket attachement wasn't meaty enough as it rounded up
i've got the backlash where it feels right but i've ordered a dial indicator (only £15) just to check.
it wasn't a bad a job as i thought it might be
here's a photo of my tool
 
Differential Tool
 
Differential Tool
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