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Discussion Starter #1
My 74 450SL didn't come with a trunk lock - Boooo!

I've obtained a replacement from a scrapped 74 450SLC - Huraaah!

It doesn't fit properly - Boooo!

The part of the rotating mechanism indicated by the red arrow needs to rotate behind the spring loaded latch lever as the key is turned counter clockwise; however mine is slightly too far forwards (towards the front of the car) so it hits the side of the spring loaded latch lever. I.e. the key cannot be turned fully counter clockwise. I hope that makes sense.

Any suggestions on what I can do? Thanks! Andy
 

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Has the tail panel been impacted to your knowledge? I experienced this problem after a rear end collision. There is a slight adjustment that can be made at the latch. I had to move mine as far forward as it would go; also had to push the outer tail panel rearward a few mils to make things line up.
 

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Discussion Starter #3
I've eyeballed it and the back of the car looks perfect. So does the panel on the inside of the trunk. I'm now wondering if this is why the PPO removed the lock.

Looking at the latch I am thinking that maybe I can build up the surface indicated to move the latch lever out of the way slightly. I've tested it with the trunk lid and it seems the lever has to move quite a way before it releases, so I think there is a bit to play with. Any ideas on how I could give it a temporary test?

Thanks, Andy
 

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This is a fiddly operation. When I had this problem, I ended up locking myself out of the trunk. If that happens, there is a solution (published on this forum) involving a drilled hole to actuate the latch. I hated doing it, but had no choice. Read this if it happens to you:

https://www.benzworld.org/forums/r-c107-sl-slc-class/1701910-trunk-lock-issues.html

I do not have a method for temporary test. I found that everything had to be securely fastened to see if an adjustment worked or not.
 

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Discussion Starter #5
Thanks Brad! What adjustment did you make on the spring loaded latch side? I can't see anything to adjust on mine.

Andy
 

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I used a wire brush to clean everything from the latch mechanism. I used Superlube (NAPA autoparts) to make sure everything was moving as it should. As far as adjustment goes, I thought there was a small amount of left/right, fore/aft allowance at the mounting points - going from memory as I am not able to look at my car at the moment.
 
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