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Location:
Castle Hill, Sydney
Registered:
February 2004
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what is backlash!!?
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Sun, 24 April 2005 11:07
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can somebody please enlighten me on the meaning of the backlash of a diff and how to adjust it
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Location:
Perth
Registered:
July 2004
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Re: what is backlash!!?
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Sun, 24 April 2005 11:14
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backlash is how tight pinion and crown wheel in a diff is meshed
when it wears out, the play gets more, or, backlash
so you shim it up
generally adjusted by moving the diff centre sideways to mesh tighter.
also, pinion can be shimmed forward or back, if its in wrong place on crown teeth. but thats set at factory (or diff place) and generally dun need resetting.
diffs that pull out on carrier (come out from front of housing) have 2 rings with holes in them, either side of centre. adjust them.
diff that come out back of housing have shims either side of bearings that hold the centre in place. change them to adjust. 
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Location:
Castle Hill, Sydney
Registered:
February 2004
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Re: what is backlash!!?
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Sun, 24 April 2005 11:16
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alriggght sweet, well ive got a ta22 whiney diff centre that is gettin the dodgy weld done to it, should i set the backlash on that or it should be right as its never been dismantled
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: what is backlash!!?
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Sun, 24 April 2005 11:43
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i suggest to always measure the backlash (the free play between gears, both crown/pinion and spider gears contribute) befor einstalling a diff, that way you can rule it out later as a cause.
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Location:
Castle Hill, Sydney
Registered:
February 2004
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Re: what is backlash!!?
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Sun, 24 April 2005 11:50
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okay so im pretty sure i know how it works/how its adjusted now, how would you go about measuring the backlash?
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I supported Toymods
Location:
Perth, WA
Registered:
May 2003
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Re: what is backlash!!?
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Sun, 24 April 2005 11:53
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take to a diff shop
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Location:
1st street on the right
Registered:
November 2002
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Re: what is backlash!!?
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Sun, 24 April 2005 12:59
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You ideally need to set pinion height/preload first. This should be done with a new set of pinion bearings and a variety of shims to suit. Takes a vice, some way to hold the pinion to tighten/remove the nut. Some diffs use a collapsable spacer to set load and a tension wrench to tighten the pinion nut.
Then you need to fit the centre. Again should have new bearings, should stop part of the whine. There should be a large nut that will adjust the crownwheel bearings L/R. This will set backlash as the teeth mesh together closer.
Then you need to check the lap of the gears. This is the surface area of the gear teeth that is in contact. Use something like bearing blue or valve paste to check. If this is out then dissassemble entire assy and reset pinion height and repeat.
Of course as it's going to be welded forget everything I just said.
Doing it just takes lots of patience and beer. (afterwards of course)
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