maximill666
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| posted on 4/6/09 at 09:20 PM |
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Sierra diff free play?
How much free play when rotating forward & back should there be in the input side of a sierra lsd diff?
The reason I am asking is that my diff has developed some free play & started clunking, about 10-15 degrees if the input shaft/prop is rotated
back and forth.
Thanks in advance
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mgmiller
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| posted on 4/6/09 at 10:16 PM |
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My 3.92 LSD does the same thing. I just thought that was normal!
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Chippy
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| posted on 4/6/09 at 10:28 PM |
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10 to 15 deg's sounds a bit on the excesive side. The backlash when setting the diff up is about, (I think),0.5 or 0.6 thou, so any movement at
the input flange is going to be very small. Cheers Ray
Edit to add
Just read the rebuild manual and that states 0.01 mm backlash, which is ,(I think), approx 0.5 thou.
[Edited on 4-6-09 by Chippy]
To make a car go faster, just add lightness. Colin Chapman - OR - fit a bigger engine. Chippy
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blakep82
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| posted on 4/6/09 at 11:48 PM |
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there's been a few threads started over the past few weeks and everyone seems to question the movement. i think the last 3 or these threads said
they got 10-15 degrees. . i don't know the figures but it seems a common amount
________________________
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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nick205
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| posted on 5/6/09 at 08:01 AM |
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I get a similar amount on mine probably 10 or so degrees. Clinks a bit if you pull off very slowly, but then there's no compliance in the prop
or diff mounting like there was in the Sierra and in mine the engine/g/box mounts are almost solid too.
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flak monkey
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| posted on 5/6/09 at 08:33 AM |
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All the diffs I have had have had very little free play.
The backlash is set to 0.01mm which equates to about 0.25mm on the input flange or there abouts. Any more and its knackered or needs adjusting.
David
Sera
http://www.motosera.com
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bimbleuk
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| posted on 5/6/09 at 10:01 AM |
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I've had 4 diffs fitted to my car over the last 2-3 years. I've had a couple with some play 3-5 degs at most but they did clonk a bit at
low speeds and one felt a little rough when crusing with little load.
The two I bought recently both had almost zero play when dry but no play when filled with oil. I fitted one of them which was straight off a donor car
and its been the best diff I've had on my car, no clonk and very smooth when driving.
Running them a little loose may lower the temps of the diff but you risk a bit of roughness as I've found.
[Edited on 5-6-09 by bimbleuk]
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maximill666
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| posted on 5/6/09 at 11:42 AM |
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Does anyone have a guide how to adjust & set the backlash on a sierra diff?
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flak monkey
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| posted on 5/6/09 at 11:57 AM |
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quote:
Originally posted by maximill666
Does anyone have a guide how to adjust & set the backlash on a sierra diff?
You need to turn the castellated nuts either side, and will need a DTI to set it as well.
I will upload the rebuild manual later and pop a link up.
Cheers,
David
Sera
http://www.motosera.com
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maximill666
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| posted on 5/6/09 at 12:01 PM |
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quote:
Originally posted by flak monkey
quote:
Originally posted by maximill666
Does anyone have a guide how to adjust & set the backlash on a sierra diff?
You need to turn the castellated nuts either side, and will need a DTI to set it as well.
I will upload the rebuild manual later and pop a link up.
Cheers,
David
Thanks David 
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flak monkey
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| posted on 5/6/09 at 01:45 PM |
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Manual now uploaded. The complicated stuff starts if you want to take the pinion out for any reason.
Link is
http://gtslocost.locostsites.co.uk/diffoverhaul.pdf
Cheers,
David
Sera
http://www.motosera.com
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maximill666
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| posted on 5/6/09 at 02:26 PM |
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Cheers Flak, much appreciated.
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