Hi all, Ive a 106 XND thats giving me grief... the engine starts first time, idles fine and generally seems ok on the drive. but it has no power when driven. any ideas? it makes knocking sounds under load,and is a bit smokey. It was losing water, but that has been traced to a cracked expansion tank (underneath... bugger to spot). is it likely the head gasket has gone? is it a tricky job to do at home? Ive worked on minis mostly, so I have a vague idea, but no diesel specific knowledge. Can you see the big ends if you remove the sump? id like to check it isnt them knocking, the previous owner was a dizzy girl, who probably ran without enough oil at some point... TIA Dave