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Old 7th November 2012, 15:49   #1
Unclefista
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Default Boot lock fix (spinning key syndrome).

After having issues with my boot not opening on the key, I eventually found a lock with the part I needed that wasn't broken and fixed it.
Since then I've answered a few threads explaining what to do, (stupidly I didn't take any photos) but it's not easy without pics.

I obtained a spare boot lock today because it was free and I've disassembled it and taken some photos of the process.

Hopefully I'll be able to point to this thread next time someone asks.

The symptoms:
Key rotates in the boot lock and doesn't unlock, the key can be spun around and around, usually there's a stop.

The cause:
Inside the lock there is a small intricate casting which cracks and breaks up.

The solution:
Replace the casting with a good one, the key is not needed for the donor lock. Finding a good one isn't easy, the one in the photos is the only one I've seen that's not cracked and/or broken at all.
I suggest taking the lock apart to check the parts before paying for it in the scrapyard.

To remove the lock you need to peel back the boot lid lining, undo the bar on the lock (red plastic clip) undo the 2 screws that secure it to the boot lid, rotate the lock and pull out, then undo the electrical plug.

You'll then have this


Turn it upside down to reveal the end plate secured by a circlip.


Remove the circlip.


The end can then come off, don't lose the spring.


Revealing the problem (there is no problem in the pic, the lock is fine).


To get to the part, you need to remove the part holding it in place.
Where the slots are in the black plastic, you need to lever the cylinder up.


Then remove it.




Which allows the part we're after to be removed.



Slide the pieces apart.



This is the part that breaks up, replace with a good one and reassemble.



Disclaimer:
You are responsible for any work or modifications carried out on your car and you undertake any such work at your own risk.
The 75 and ZT Owners Club nor the original author of this How-To can be held liable for anything that may happen as a result
of you following this How-To.
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Last edited by Dragrad; 7th November 2012 at 22:45.. Reason: Disclaimer added
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Old 7th November 2012, 21:30   #2
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Excellent job Tony and so has earned its place in the How To
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Old 11th April 2015, 19:58   #3
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I have same problem with an added extra piece broken, the black plastic lugs on the triangle end piece.





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Old 12th April 2015, 04:35   #4
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I'll be doing mine tomorrow.

Edit: Brilliant how to. Not only do I have the convenience of the lock working with the key again it also stopped an annoying trunk open alarm.
Hoorah!
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Old 12th April 2015, 10:24   #5
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Hi Matthew, Where did you get the parts ?
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Born 4th July 2001 17:24:11 - Born 8th January 2002 09:02:26.
Comms no: 409 - Comms no: ---
53rd Solar Red ZT (code: CEU) to be made out of 1,888 Solar Red ZT's - 38th MG TF in BRG Pearlescent (code: HFF) to be made out of 3,353 BRG Pearlescent TF's.
193rd ZT190+ to be made out of 4,023 - 123rd MGTF 135 to be made out of 19,475.
200th ZT to be assembled out of 18,894 - 145th MG TF to be assembled out of 41,656.
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Old 13th April 2015, 05:02   #6
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Hi Westly I just asked here in the parts wanted section.
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Old 18th October 2015, 13:37   #7
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Decided to get my boot lock fixed today. I was lucky the plastic ears were not broken so didn't need the 'screw fix'. I didn't have a new metal part so resorted to using a small loop I got from an old key ring.
Unfortunately I couldn't get the oem return spring back in position but at least the boot lock is working again. Hopefully the pictures explain better then me! 

http://s1288.photobucket.com/user/ge...how/Rover%2075
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Old 10th June 2017, 19:16   #8
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Thanks to Uncle Fiesta for a very helpful post. It certainly belongs on the "How to" page, although I couldn't find it there.

The problem with taking parts from old locks is that they are used and may be nearing the end of their lives. I did this fix three years ago but now need to do it again, and working locks are becoming more difficult to find.

It's a long shot, I know, but is it possible to buy a new cast piece to replace the broken one? Alternatively, does anyone know whether there is a vehicle currently in production which uses the same piece in its locks, so that I could buy a new lock to extract the relevant part?
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Old 10th June 2017, 19:56   #9
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You could try THIS remedy.
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Born 4th July 2001 17:24:11 - Born 8th January 2002 09:02:26.
Comms no: 409 - Comms no: ---
53rd Solar Red ZT (code: CEU) to be made out of 1,888 Solar Red ZT's - 38th MG TF in BRG Pearlescent (code: HFF) to be made out of 3,353 BRG Pearlescent TF's.
193rd ZT190+ to be made out of 4,023 - 123rd MGTF 135 to be made out of 19,475.
200th ZT to be assembled out of 18,894 - 145th MG TF to be assembled out of 41,656.
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Old 10th June 2017, 20:53   #10
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I was going to try that, but the plastic lugs on my lock are not broken; it's only the casting which is defunct. Thanks for the suggestion, though.
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