No compression, all cylinders, r53

[Frank Bartlett]

04 Mini Cooper S, R53 engine. While driving the engine was running normally, then started running rough for a short time, and then quit. Subsequent inspection and testing reveals no (zero) compression on all four cylinders. Leak down test has air leaking into the crankcase and adjacent cylinders.

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[Dave Tidman]

Not sure what the question is, but is seems likely the mechanical timing likely has slipped or failed and bent a lot of the valves (or caused something else in the valve train). Will probably take some teardown to know for sure, but I’d be thinking of a replacement engine.

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