Thanks Max. I just went back to the BMW dealer and they are telling me that I need bigger, not smaller shims. The mechanic has made this diagnosis by listening to the raspy sound of the engine and by 'scanning' it - using the onboard diagnostics. I am getting them to open the valve cover tomorrow and check the clearances exactly with a feeler gauge.
Then my problem will be waiting for shims to arrive from Europe... Luckily I am planning to return to Lima in a couple of weeks after visiting the north coast. But I am hoping to find a quicker (more expensive no doubt) way to courier the parts from Europe. FedEx?? Any suggestions??
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