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Thanks everyone for the hints, tips, and explanations. It looks like I will at least be going down the route of creating an engine based on a MA12 block and head with, depending on what I find from scrap merchants, various options on the carb front! You've certainly helped explain what I will...

Hi, I have a 1991 K10 micra with the 1.0L MA10 engine and 4-speed gearbox. The MA10 engine needs a full re-build (new piston heads, bores scored, etc.) and currently I'm exploring the option of putting in a replacement MA12 engine while I take my time with the re-build of the original MA10. I...

Thanks for the comments. Nothing loose in the sump. The new sump was very slightly different from the old with an internal baffle just making contact with the engine block, it must have set up a resonance. A few minutes with a file making sure that no swarf entered the sump and it was...

The sump on a K10 had corroded. Apart from that the engine was fine and ran sweetly. I fitted a new sump and now have a clattering sound. The only thing I had done when the sump was off was to remove the oil strainer to clean it. I have checked valve clearances. Any ideas?