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 Post subject: Backlash
Posted: Sun Feb 07, 2010 4:49 pm 
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After getting my diff centre and axles fitted, there is a lot of noise coming from my rear end. To me, it seems there is too much backlash as it is pretty violent at low speeds and quite noisy when cruising at lowish revs with no load on the motor.

Is there any way of telling if backlash is set right? I've never really had any problems with it before and am concerned it may cause problems with my gears and the rest of the driveline if ignored.

Chad

 

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 Post subject: Re: Backlash
Posted: Sun Feb 07, 2010 9:01 pm 
Getting Side Ways
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The only wat your gonna know is to remove the back cover set up a dial indicator, and measure what it is.................or take it back to where you got it done, and complain.

 

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 Post subject: Re: Backlash
Posted: Mon Feb 08, 2010 9:25 am 
Getting Side Ways
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Yeah, my intention is to take it back if it turns out it is not right. I was hoping to be able to find out for sure before taking it back. I could go back and be told "we did this and that and the measurement is such and such which is the correct way to do it." Then I am left still unsure.

 

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 Post subject: Re: Backlash
Posted: Mon Feb 08, 2010 8:44 pm 
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Mate
get under the car and grab the diff flange if there is more than 5mm it is too much for a rebuild alternative if there is no movement there maybe to many shims in it which can make it moan


gassa

 

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 Post subject: Re: Backlash
Posted: Mon Feb 08, 2010 11:52 pm 
Getting Side Ways
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There is a lot of play in the tailshaft when in neutral. I'd say there's 5mm or more. Will double check when I get a chance tomorrow if I remember. Out of interest, where do the shims go? I'm guessing they go behind either the crown or pinion gear to bring whichever one closer to the other. Is it really that difficult to shim it up yourself? If it's not done right, then I want to be able to learn how to do it myself, so if I do it and it's not right, then at least I can rectify it myself. Then, if I really screw it up, then I can learn from my mistake, buy the parts and fix it (hopefully without making the same mistake twice).

 

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 Post subject: Re: Backlash
Posted: Tue Feb 09, 2010 12:48 pm 
Getting Side Ways
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Scaffy wrote:
There is a lot of play in the tailshaft when in neutral. I'd say there's 5mm or more. Will double check when I get a chance tomorrow if I remember. Out of interest, where do the shims go? I'm guessing they go behind either the crown or pinion gear to bring whichever one closer to the other. Is it really that difficult to shim it up yourself? If it's not done right, then I want to be able to learn how to do it myself, so if I do it and it's not right, then at least I can rectify it myself. Then, if I really screw it up, then I can learn from my mistake, buy the parts and fix it (hopefully without making the same mistake twice).


There is more to it than just moving the pinion in & out ( pinion height ), there is also moving the crown wheel ( centre ) across too, and getting the "drive" & "coast" patterns right.....as well as the right backlash on top of that, then, still having the right bearing preloads on both the pinion & the carrier.
There is a reason why it takes 4 years to be a Motormechanic.

 

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 Post subject: Re: Backlash
Posted: Tue Feb 09, 2010 2:01 pm 
Getting Side Ways
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i had a nine inch rebuilt many moons ago and f**k was it noisy and clunky - didn't like corners either at first, but it did settle in.

 

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 Post subject: Re: Backlash
Posted: Tue Feb 09, 2010 3:16 pm 
Getting Side Ways
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fairlane6970 wrote:
i had a nine inch rebuilt many moons ago and f**k was it noisy and clunky - didn't like corners either at first, but it did settle in.


That sounds like the LSD pack wasn't soaked for a period of time prior to installation.

 

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 Post subject: Re: Backlash
Posted: Wed Feb 10, 2010 12:23 am 
Getting Side Ways
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Age: 39

Posts: 1886

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Gallery: 7 images

Ride: EL XR8, '08 Mondeo XR5t

Power: 205 rwkw

Location: Perth
WA, Australia

cjh wrote:
Scaffy wrote:
There is a lot of play in the tailshaft when in neutral. I'd say there's 5mm or more. Will double check when I get a chance tomorrow if I remember. Out of interest, where do the shims go? I'm guessing they go behind either the crown or pinion gear to bring whichever one closer to the other. Is it really that difficult to shim it up yourself? If it's not done right, then I want to be able to learn how to do it myself, so if I do it and it's not right, then at least I can rectify it myself. Then, if I really screw it up, then I can learn from my mistake, buy the parts and fix it (hopefully without making the same mistake twice).


There is more to it than just moving the pinion in & out ( pinion height ), there is also moving the crown wheel ( centre ) across too, and getting the "drive" & "coast" patterns right.....as well as the right backlash on top of that, then, still having the right bearing preloads on both the pinion & the carrier.
There is a reason why it takes 4 years to be a Motormechanic.


Cheers for clearing that up for me cjh. I had a feeling there'd be more to it - hence not that many people doing it themselves. But hey, given the chance and the right guidance, I'd still probably try and give it a crack myself like I did with tuning my car.

I've always wondered, why does it take 4 years to become a mechanic? :P

 

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When injustice becomes law, resistance becomes duty

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