have removed right valve cover--- need to remove left valve cover---- to check tappets and chain stretch----left valve cover is blocked from removal by two pipes---which appear to be vacuum line from brake unit and hose from pressure regulator--is there any problem in disconnecting these and reconnection---thanks for all answers---- they are a great help----syd

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syd 81.300SD.196k
72.300SEL 4.5
mileage.Only god knows!