Removal of rear seat back (not the cushion)
 

I will shortly be changing the interior of the car (from blue to sandstone), so need to remove the rear seat back. Any advice would be appreciated, thanks.

If it doesn't have buttons, try feeling under the seat back, above the wheel arches for two straps, pull these to drop the back. Removal is easier if you remove the base first 😎

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It has buttons at the top and the seat can be hinged down. I actually want to remove it from the car.

Then it's easier to remove the base first. You can then lay the back flat and lift it from the hinges

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https://i.imgur.com/7nZruhgl.jpg
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I've just removed the rear seat back since I personally just couldn't get the lower seat cushion out without removing the back. I noted that there were fragments of white plastic in the bottom of the female hinge cut outs on my Rover. The photos you took Ron clearly show a white plastic insert in good condition within the hinge cut out. I suspect this is quite important in keeping the seat aligned with the retention clips for the seat back.
Rimmers diag part number 2 in this link which of course is not available.

https://rimmerbros.com/Item--i-GRID001876

I suspect the plastic inserts have degraded in the majority of our cars by now since it seems to be an ageing thing rather than over use. If that white plastic insert is not present, the seat back will drop lower into the hinge receptacle, possibly causing issues with the locking mechanism. One of the welded hinge supports in my vehicle has been bent out of shape by someone trying to remove the seat back in the past, their difficulty possibly also caused by the broken plastic inserts.
I wonder if those clips are available anywhere else?:shrug:

I still can't get the back out. How easy does it move> Which direction do I need to pull from the hinges, is it up, back, forward, or an angle?

I really struggled to get the back out of mine. I tried to remove the bottom seat section which popped up at the front easily enough, but there are hooks at the back which I couldn't disengage while the back was bearing down on the seat ( due to failed white plastic inserts). In the end, what worked for me was almost accidental. I folded the backrest right down forwards as far as it would go, hard down on the seat, to try to rotate the eccentric male part of the hinge as much as possible. One side popped out and then eventually the other side came out. It definitely doesn't lift out vertically or at just 45 degrees forwards. if your plastic inserts are broken it just makes it more of a challenge.

The pivot pin is eliptical in shape, like a cam lobe, it will only lift out if the lobe is lined up with theopening, which only happens if the backrest is flat, which is why seat base removal makes it easier:cool:
To remove the base, lift up the front until it pops off the spring bars, then push back with your knees to disengage the spring bars from the rear hooks, at the same time, lift from the back, if that makes sense?:D
Courtesy of T-Cut https://www.the75andztclub.co.uk/for...98&postcount=2

That's a better explanation than mine:bowdown: Explains why I had to crush the back against the seat so firmly and also why a previous person had bent one of the hinge receptacles.
If those white plastic inserts have crumbled, the camlobe males on the backrest drop lower down into the hinge female cutouts and make it harder to get the lower seat out to release the back.
Anyone know if there are any available?