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Heading south to Florianopolis, Brazil in the 1979 Volkswagen, I heard a loud bang and felt a huge loss in compression. I pulled off to inspect the engine. Typical Vanlife.
A few months earlier I had a mechanic work on the hippie van in Bolivia. Sadly he cross threaded one of my spark plugs (and didn’t mention it). I discovered this a month later and had a mechanic in Sao Paulo help to re-thread the cylinder head. Sadly the repair failed after a few thousand km.