 | Home > Technical > Angles..... |
 
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| Caterham Member Since: 06 Nov 2008 Location: Birmingham Posts: 6295   
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So just a hypothetical question of course....
To my mind the rear A controls predominantly lateral movement of the rear axle but also controls rotation of axle and relies on the ball joint to operate as intended? Assuming this is the case and assuming my ball joint is shagged and sticking as per my track rod end I assume this would skupper the ANGLES that the rear prop uj were supposed to operate with? Could this is then potentially create a clattering sound and in extreme circumstances a braking effect or is this just not possible? The other day while driving miss daisy fashion I parked up half on pavement and half on road using drop kerbs and although this was a typical height kerb there was a good old clonk from underneath. 500 yrds later driving through an underpass and the clattering was as bad as it ever gets......just coincidence? |
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12th Sep 2015 9:23am |
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| mk1collector Member Since: 17 Sep 2009 Location: West Yorkshire Posts: 6769 
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And so it starts again Ray
My build thread http://www.defender2.net/forum/topic17615.html |
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12th Sep 2015 9:45am |
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| Caterham Member Since: 06 Nov 2008 Location: Birmingham Posts: 6295
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Could it?
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12th Sep 2015 10:04am |
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| davew Member Since: 02 Jan 2012 Location: North Yorkshire Posts: 888 
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The A frame handles movement in all directions, not just lateral. The geometry of the rear trailing arms and the A frame combined keeps the diff level as the axle moves up and down, ensuring that the diff flange and transfer box output flange are parallel to each other through most of the axle's travel. Under acceleration/deceleration the A frame prevents the axle twisting. That's why the A frame attaches at the top of the diff and the trailing arms attach at the bottom of the axle.
It's unlikely that even a badly worn A frame ball joint will allow the axle to move so much it will effect the prop. More likely you have a bad exhaust mount and parking it on a kerb just shifted it a bit. The ball joint, if worn, will make a sound similar to other suspension bushes, more of a single clonk as you set off forwards after reversing. http://www.yorkshireoffroadclub.net/ |
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12th Sep 2015 10:25am |
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| Caterham Member Since: 06 Nov 2008 Location: Birmingham Posts: 6295
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Davew thanks very informative.
I need to have a look again underneath but my query is more based on 'if the ball joint was stiff an not allowing things to move as they should - could this prevent the flanges from lining up as they should and hence cause problems? |
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12th Sep 2015 10:35am |
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| JWL Member Since: 26 Oct 2011 Location: Hereford Posts: 3443 
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If you think there is a problem then change it, they're not mega money and it will give you peace of mind.
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12th Sep 2015 11:16am |
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| Happyoldgit Member Since: 14 Sep 2007 Location: Norfolk Posts: 3471  
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Seriously, it was only a few days ago you were looking at steering wobbles and asking what the swivel pins did, now you're conjecturing about the A frame balljoint. You seriously need to get another hobby Wayne
 Steve.
Owned numerous Land Rover vehicles of all shapes and sizes over the decades. Current Defender: A non tarts hand-bagged Puma 110 XS USW. [Insert something impressive here such as extensive list of previous Land Rovers or examples of your prestigeous and expensive items, trinkets, houses, bikes, vehicles etc] http://forums.lr4x4.com I used to be Miserable ...but now I'm ecstatic. |
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12th Sep 2015 12:09pm |
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| Caterham Member Since: 06 Nov 2008 Location: Birmingham Posts: 6295
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I'm getting it replaced as a matter of course but I'm interested to know what side effect if any you'd get from the ball joint being stuck in one position / or if it were very stiff?
Steve - re the swivel pins I presume You saw the video....the knocking noise clearly wasnt my imagination..........this time (it wasn't the swivel pins either......??)  Last edited by Caterham on 12th Sep 2015 2:51pm. Edited 1 time in total |
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12th Sep 2015 12:52pm |
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| K9F Member Since: 12 Nov 2009 Location: Bournemouth Posts: 9610 
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You've got more money than sense. My late father used to say "A fool and his money are soon parted!" In this case your money pit seems to be bottomless and the part about finding another hobby is true!
I feel another marathon thread coming on! Just get it swapped out and report once it's done please!  If you go through life with your head in the sand....all people will see is an ar5e!!
Treat every day as if it is your last....one day you will be right!! |
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12th Sep 2015 1:08pm |
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| Caterham Member Since: 06 Nov 2008 Location: Birmingham Posts: 6295
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Ssshhhh. The wife might hear and starting quizzing me about this pit!
Gonna see if I can get one today and fit tomorrow but i'm a wee bit apprehensive about the fitting? |
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12th Sep 2015 1:46pm |
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| K9F Member Since: 12 Nov 2009 Location: Bournemouth Posts: 9610
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"What could possibly go wrong?"
No need to answer or post about each nut and bolt progress.  If you go through life with your head in the sand....all people will see is an ar5e!!
Treat every day as if it is your last....one day you will be right!! |
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12th Sep 2015 6:18pm |
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| Caterham Member Since: 06 Nov 2008 Location: Birmingham Posts: 6295
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I really don't know what you mean?
I successfully repair the a/c without any help or supervision  |
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12th Sep 2015 6:22pm |
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| davew Member Since: 02 Jan 2012 Location: North Yorkshire Posts: 888
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If the A frame ball joint was seized you'd know because you would have no articulation at all, I can't imagine a situation where that would happen. When they wear you get extra movement in the joint which causes a clonk when you take up the slack in the transmission.
Replacing it is arguably one of the hardest jobs to do at home on a Defender, I've never done one at home, I always take it to a mate's garage and I've rebuilt more Land Rovers from scratch on my drive than I care to remember. You need a decent professional quality press to get the old joint out and the new one in unless you buy the complete assembly. http://www.yorkshireoffroadclub.net/ |
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12th Sep 2015 10:18pm |
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| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 20278
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12th Sep 2015 11:58pm |
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