Hi,

It finally occurred to me that it might be a good idea to look under the spare tire for rust:


There was also some under the battery:


Considering when I shine a light towards both these areas, I can look underneath the car and see a nice pattern of lights on the ground, I assume this rust is quite bad... Can people confirm this?

What should I do about it?

Cheers,
Harry

That's pretty bad dude... you can replace the battery box with a new one. The spare tyre well is going to be abit more work though

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Lillee - 1969 Morris Mini K

Same as mine.
Had to replace the whole boot floor & battery box.
Then found we had to cut the back off to get the new floor in.
Craig

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1967 Morris Mini Deluxe
1927 Austin 7

Battery box is no chance and has to be replaced. On the rest of it Id get a wire wheel and a grinder on it, but Looks like its gone.

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Stop Licking the Dog...I Don't Care Who Started It

Mine looked just like that. Was only rusted in the bottom.
I cut the bottom out but left 4mm all around, it was fine there, not rusty.
Then I cut a piece of 2mm steel plate to drop inside. Welded all around, lick of paint and it was fine.
That was 15 years ago, it's still fine.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.