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Author Topic: twitchy backend  (Read 10200 times)

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Kevin Wood

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Re: twitchy backend
« Reply #15 on: 30 January 2017, 20:53:00 »
Quote from: Magwheels on 30 January 2017, 17:52:07
Seeing as the car is IRS then I fail to see how the diff mount would add to any rigidity in the back end. My first look (especially if the car was running low for any length of time would be the subframe mounts or the trailing arm bushes, both add (or not) locational strength to the rear end.

The diff bushes locate the subframe too.
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Doctor Gollum

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Re: twitchy backend
« Reply #16 on: 30 January 2017, 21:22:30 »
Quote from: Kevin Wood on 30 January 2017, 20:53:00
Quote from: Magwheels on 30 January 2017, 17:52:07
Seeing as the car is IRS then I fail to see how the diff mount would add to any rigidity in the back end. My first look (especially if the car was running low for any length of time would be the subframe mounts or the trailing arm bushes, both add (or not) locational strength to the rear end.

The diff bushes locate the subframe too.
Technically, the diff is mounted to the subframe, the rear of which is supported by the 'diff' mounts...
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Kevin Wood

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Re: twitchy backend
« Reply #17 on: 30 January 2017, 22:49:52 »
Quote from: Doctor Gollum on 30 January 2017, 21:22:30
Quote from: Kevin Wood on 30 January 2017, 20:53:00
Quote from: Magwheels on 30 January 2017, 17:52:07
Seeing as the car is IRS then I fail to see how the diff mount would add to any rigidity in the back end. My first look (especially if the car was running low for any length of time would be the subframe mounts or the trailing arm bushes, both add (or not) locational strength to the rear end.

The diff bushes locate the subframe too.
Technically, the diff is mounted to the subframe, the rear of which is supported by the 'diff' mounts...
Yes, basically what I was trying to say, so the consequence of failure is more than just a diff floating around a bit more than normal.
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Doctor Gollum

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Re: twitchy backend
« Reply #18 on: 30 January 2017, 22:54:23 »
The amount of play at the wheels that an inch of movement just off the centreline can generate is quite impressive...


... providing you're not actually in the car when it manifests itself :o
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terry paget

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Re: twitchy backend
« Reply #19 on: 30 January 2017, 23:20:35 »
I have mentioned before that of all the Omegas I have owned and driven  - I currently have six - just one has displayed a twitchy back end. I have jacked the back up, removed the wheels, heaved it this way and that, and could find nothing amiss. It is a 2000 2.5 petrol manual estate, 160000 miles, running well. What should I look for to explain its misbehaviour?
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Re: twitchy backend
« Reply #20 on: 31 January 2017, 00:13:07 »
With it overf the pit... remove each diff mount in turn, ie undo one unit, refit, repeat on other...

For the purposes of the exercise, the two bolts that hold the mount to the chassis are all that need undoing. If the bracket drops away, there be your problem :y
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omega2018

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Re: twitchy backend
« Reply #21 on: 31 January 2017, 01:02:05 »
i had the traction control kick in twice on sunday whilst driving in a straight line,  no braking, on a dual carriageway about 60mph.  it was through large amounts of fallen rain and i had to hold the steering wheel. i don't remember it before though, maybe it is my new tyres.

i once had a rover P6 also rear wheel drive.  back end used to kick out if you floored it on slippery roads, you had to turn into the skid to keep straight. 
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Kevin Wood

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Re: twitchy backend
« Reply #22 on: 31 January 2017, 09:27:12 »
Rear shock absorbers are also worth a check if the back end is a bit wayward. :y
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Nick W

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Re: twitchy backend
« Reply #23 on: 31 January 2017, 10:03:45 »
Quote from: Doctor Gollum on 31 January 2017, 00:13:07
With it overf the pit... remove each diff mount in turn, ie undo one unit, refit, repeat on other...

For the purposes of the exercise, the two bolts that hold the mount to the chassis are all that need undoing. If the bracket drops away, there be your problem :y


Which is exactly what happened to mine.
I've two more holes to drill and tap, and my repair jig is complete. That just leaves the rubber to remove from the bracket, and the polyurethane to arrive and I'll be able to make the repair.
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terry paget

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Re: twitchy backend
« Reply #24 on: 31 January 2017, 16:07:53 »
Quote from: Doctor Gollum on 31 January 2017, 00:13:07
With it overf the pit... remove each diff mount in turn, ie undo one unit, refit, repeat on other...

For the purposes of the exercise, the two bolts that hold the mount to the chassis are all that need undoing. If the bracket drops away, there be your problem :y
Thanks DG. I think these are the mounts you refer to, I removed them one at a time, but was dismayed to find them quite firm. I can see that had they been loose when unbolted that would cause my fault.Strictly speaking these are rear sub frame rear mountings, the front two are just ahead of the rear wheel arches. The diff is mounted entirely on the rear sub frame. I'm sure you all know this, but I did not. Pics follow.
https://www.dropbox.com/s/qgg4sxr6cf40mpt/REAR%20SUB%20FRAME%20SHOWING%20MOUNTS.jpg?dl=1
https://www.dropbox.com/s/b6fqvz585ekuqde/DIFF%20MOUNTING%20LOOSE25%25.jpg?dl=1
https://www.dropbox.com/s/qgg4sxr6cf40mpt/REAR%20SUB%20FRAME%20SHOWING%20MOUNTS.jpg?dl=1
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terry paget

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Re: twitchy backend
« Reply #25 on: 31 January 2017, 16:18:42 »
Apologies, no pics, will try again.




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terry paget

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Re: twitchy backend
« Reply #26 on: 31 January 2017, 16:45:56 »
Woops. Top pic shows rear sub frame right hand side, with front mount bottom centre and rear mounting top right
Second pic shows LH rear sub frame mount unbolted from body and bolt supporting diff just ahead of it
Third pic is same as first; should have shown diff rear mounting, again to rear sub frame. Here it is.

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terry paget

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Re: twitchy backend
« Reply #27 on: 31 January 2017, 17:52:38 »
Further correction. Last pic shows diff FRONT mounting, via a bracket, to a single bolt on the rear sub frame.
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TheBoy

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Re: twitchy backend
« Reply #28 on: 31 January 2017, 19:19:37 »
Quote from: migmog on 31 January 2017, 01:02:05
i don't remember it before though, maybe it is my new tyres.
Are they shit tyres?
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omega2018

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Re: twitchy backend
« Reply #29 on: 31 January 2017, 20:02:22 »
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