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I supported Toymods
Location:
Perth, WA
Registered:
May 2003
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welded diff!
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Wed, 19 November 2003 11:05
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ok, i've got the centre out now what do i have to weld with what? i've taken some pics witha few angles for ya's
cheers
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I supported Toymods
Location:
Ademelaide, SA
Registered:
July 2003
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Re: welded diff!
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Wed, 19 November 2003 11:15
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ok...
see where the 2 red circles are?
there are holes there, where if you look inside, you can see little gears...
weld those little gears together.
there are actually 4 holes to weld inside.
be careful you dont get any spog or weld shit on the crown wheel, or pinion gear. if you do...your fuggered.
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I supported Toymods
Location:
Perth, WA
Registered:
May 2003
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Re: welded diff!
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Wed, 19 November 2003 11:34
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ok thanks mate
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I supported Toymods
Location:
Perth, WA
Registered:
May 2003
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Re: welded diff!
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Wed, 19 November 2003 11:35
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ok thanks mate
also wat sort of weld is best and should i put a plate of metal in?
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Location:
Melbourne
Registered:
September 2002
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Re: welded diff!
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Wed, 19 November 2003 11:57
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If I was you I'd dismantle the diff futher to get cage containing the spider gears (they're the one you want to weld) out of the centre housing and remove the crown wheel from it. If you get welding slag on the crown wheel or pinion you may as well throw it away.
You'll also get better access to the bits you want to weld and can also make sure you clean it thoroughly of any oil that will stuff up your welding.
I usually put some small square plates in the centre of the spider gears and also some triangular ones in between the teeth on the adjacent gears and weld it all together.
Use MIG if you've got it and pump up the volume.
P.S. It usually takes about a day before you can pick the thing up with your bare hands again
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I supported Toymods
Location:
Perth, WA
Registered:
May 2003
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Re: welded diff!
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Thu, 20 November 2003 06:05
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how do i go about taking it apart, i dont wanna break anything
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Location:
Adelaide
Registered:
May 2002
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I supported Toymods
Location:
Perth, WA
Registered:
May 2003
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Re: welded diff!
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Thu, 20 November 2003 06:59
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ok i've unbolted the big cog and the 4 little ones atatched to it from the housing. then i undid the small bolts and pulled off the side part with the bearing that contains the 4 little spider gears. do i need to unbolt the other side with the big bolts? they are awfully hard to take off so i dont really want to try.
cheers
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Location:
Brisbane
Registered:
October 2002
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Re: welded diff!
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Thu, 20 November 2003 07:01
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http://www.geocities.com/mrdohc2000/diff.html
u see the 4 smashed gears there, they are the ones to be welded together
one way to keep it cool is to mostly fill it with water, not so the water hits where u r welding  , and that will dissipate the heat better, but u have to clean it well or else u will end up with a nice diff oil emulsification 
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I supported Toymods
Location:
Perth, WA
Registered:
May 2003
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Re: welded diff!
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Thu, 20 November 2003 07:08
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ok i got up to that part, all i need is to get ti welded.
i got another question, after i degreased my diff last night i left it over night and now the bearings and cogs are covered in rust, does this matter? also the cog inside the housing has seized.
thanks
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Banned user
Location:
ADELAIDE - The Drift City
Registered:
July 2002
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Re: welded diff!
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Thu, 20 November 2003 09:08
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mild surface rust... bearing grease is your friend...
BTW... keep in mind that lockers will be noisy and wont last as long as an open diff...
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I supported Toymods
Location:
Perth, WA
Registered:
May 2003
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Re: welded diff!
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Thu, 20 November 2003 11:58
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cheers
got it welded up solid
gonna put it in now and go for a drive 
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Location:
Canberra
Registered:
May 2002
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Re: welded diff!
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Thu, 20 November 2003 12:06
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what sort of diff centre is that in the pictures?
Cheers
Phil
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Location:
camden
Registered:
September 2003
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Re: welded diff!
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Thu, 20 November 2003 12:06
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let us know how it goes eg(handles,does burnouts,donuts,etc)cause i am interested in doing the same for my sprinter...
cheers
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I supported Toymods
Location:
Ademelaide, SA
Registered:
July 2003
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Re: welded diff!
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Thu, 20 November 2003 15:17
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| TE72_Turbo wrote on Thu, 20 November 2003 22:36 |
what sort of diff centre is that in the pictures?
Cheers
Phil
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looks like a standard s-series sprinter diff. factory 4 pinion....
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Location:
Canberra
Registered:
May 2002
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Re: welded diff!
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Fri, 21 November 2003 02:10
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I never knew they were 4 pinion! You learn something every day....
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Banned user
Location:
ADELAIDE - The Drift City
Registered:
July 2002
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Re: welded diff!
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Fri, 21 November 2003 03:13
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yep, factory S series is stronger then a open T series i reckon.
BTW: New record, i took my diff out just then, made my lunch and had a piss all in 17 minutes
stupid noises... gotta find out what they hell they are!
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Location:
1st street on the right
Registered:
November 2002
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Re: welded diff!
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Fri, 21 November 2003 10:47
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I Spoke to the boiler makers at work re welding diffs and they said to try using hard facing rods. Not to join the gears, but to build up between the teeth and give more surface area. Then weld on very high current (for penetration) the two areas together.
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I supported Toymods
Location:
Perth, Western Australia
Registered:
December 2002
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Re: welded diff!
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Sat, 22 November 2003 10:03
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| Simon-MrRx7 wrote on Fri, 21 November 2003 11:13 |
yep, factory S series is stronger then a open T series i reckon.
BTW: New record, i took my diff out just then, made my lunch and had a piss all in 17 minutes
stupid noises... gotta find out what they hell they are!
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Did you piss on the left or right Wheel?
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I supported Toymods
Location:
Perth, WA
Registered:
May 2003
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Re: welded diff!
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Tue, 09 December 2003 11:30
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!!! my diff broke today from just normal driving, im yet to open it up and have a look.
the welded diff was great for burnout/donuts. not good for parking. i didnt have much trouble driving around normally on it.
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Location:
sydney
Registered:
March 2003
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Re: welded diff!
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Tue, 09 December 2003 11:43
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when i used to weld diffs up years ago
i would make tiny plates out of 5 mm steel
cut it in a small rectangle shape so it fits snuggly between the 4 gears
then weld all the gears to the steel plate
when u weld 2 hardened things together u can break the weld
when u weld a hardened gear to a steel plate its much better
i have never had a weld break doin it htis way
but then th e weakest thing in yr driveline will break next
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Location:
Canberra
Registered:
August 2002
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Location:
adelaide
Registered:
April 2003
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Re: welded diff!
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Wed, 10 December 2003 00:50
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welding diffs is not the 'science' its made out to be, at the end of the day you are butchering the diff and it wont last long anyway so in regards to heat treating etc it is a waste of time IMO
i have never seen a welded diff actually break the weld holding the spider gears together. if this happens perhaps you should check your welding skills!
they are good fun but they eventually break, the last one i had shook itself to bits (i imagine the skipping about of the back end caused this) and the bolts holding the crown wheel to the carrier vibrated themselves free (all bar 1). this is common apparently.
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Location:
Albany WA
Registered:
October 2003
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Re: welded diff!
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Fri, 19 December 2003 01:25
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can you weld the crown wheel to the carrier?
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Banned user
Location:
ADELAIDE - The Drift City
Registered:
July 2002
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Re: welded diff!
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Fri, 19 December 2003 03:13
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i hope thats a joke...
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I supported Toymods
Location:
Perth, WA
Registered:
May 2003
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Re: welded diff!
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Fri, 19 December 2003 06:17
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you try it and tell me how it goes 
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Location:
Brisbane
Registered:
October 2002
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Re: welded diff!
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Fri, 19 December 2003 06:45
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| Simon-MrRx7 wrote on Fri, 19 December 2003 13:13 |
i hope thats a joke...
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it' dhave to be a joke, if he knows what a crownwheel and a carrier is then he WILL know not to weld them
BTW i just finished welding mine today, hope to install it this weekend
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Banned user
Location:
ADELAIDE - The Drift City
Registered:
July 2002
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Re: welded diff!
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Fri, 19 December 2003 06:55
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oh i dont know.. he may hve been serious
theres some stupid people out there...
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Location:
camden
Registered:
September 2003
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Re: welded diff!
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Sat, 20 December 2003 09:20
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hey mate, how did you find handling with the welded diff? was it abit hairy or was it ok  cause apparently they arent as hairy in little/light cars as opposed to big and heavy cars...
cheers
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Banned user
Location:
ADELAIDE - The Drift City
Registered:
July 2002
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Re: welded diff!
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Sat, 20 December 2003 23:24
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my rx7 handles a LOT better with the addition of a locked diff
the ae86 wasnt as good, very understeery, the TRD lsd is sooooooooooooooooooooooooooo mucvh better
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