se7ensport
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| posted on 6/4/07 at 05:13 PM |
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Sierra diff, how much play???
with both wheels on the ground how much play should there be in the diff by moving the propshaft? my propshaft has about 3-4 degrees movement between
clockwise and anticlockwise before it feels as though its about to turn the drive shafts, is this normal?
I seem to get a bit of a clonk if I go from heavy engine braking to hard accelatation, the joints don't seem to have any play, so I'm
wondering if diff is struggling.
Thanks
Alex
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OX
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| posted on 6/4/07 at 05:33 PM |
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with both wheels on the ground i can move my prop about 5mm but it looks like my slack is in the drive shafts as well
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se7ensport
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| posted on 6/4/07 at 05:41 PM |
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Thanks for the info, mine seems to be the same, assuming you don't get a clunk between hard engine braking and accelaration?
everything seems secure so I'm at a lose as to where the clunk comes from.
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tks
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| posted on 6/4/07 at 06:07 PM |
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mhh couldn't one of the suspenions arms come loos??
i mean the clunk could come from the arms because while braking you are trying to twist them backwars while accelerating it want to go faster forward
as the chasis..
hope it makes sense...
tks
The above comments are always meant to be from the above persons perspective.
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se7ensport
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| posted on 6/4/07 at 06:56 PM |
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I've been through all of the suspension bushes as a starting point and they all seem very firm, next up to check will be the diff, gearbox &
engine mounts
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snapper
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| posted on 6/4/07 at 08:06 PM |
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Classic propshaft UJ giving up the ghost, if it has circlips holding the spiders in then rebuildable. Had the same problem on a Spitfire in my yoof it
clunked, then it whined then it grind then i rebuilt it.
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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froggy
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| posted on 6/4/07 at 09:16 PM |
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7" units run with hardly any backlash around ten thou when i had mine rebuilt
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se7ensport
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| posted on 6/4/07 at 10:05 PM |
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quote:
Originally posted by snapper
Classic propshaft UJ giving up the ghost, if it has circlips holding the spiders in then rebuildable. Had the same problem on a Spitfire in my yoof it
clunked, then it whined then it grind then i rebuilt it.
will i be able to feel the movement by hand or is it only under engine load that it shows up?
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Chippy
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| posted on 6/4/07 at 10:54 PM |
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If your propshaft UJ has gone it will be quite easy to see. If you hold the shaft each side of the UJ and twist both ways, you will see movement, and
there should be none at all. I would think that its more likely to be the diff, when mounted in the sierra's rubber mounting the clonk is not so
noticable, solid mounted in a se7en the noise is transmitted through the chassis. I have exactly the same problem, and I am trying to find somewhere
that will rebuild it, (with no luck so far). HTH Ray
To make a car go faster, just add lightness. Colin Chapman - OR - fit a bigger engine. Chippy
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britishtrident
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| posted on 7/4/07 at 05:56 PM |
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That ammount of play is fairly normal on a high mileage final drive -- remember it isn't all in the pinnion most of it is in the differrential
gears which run at much wider clearances.
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