About got the 3.5 tore all apart. Trying to get the cam sprockets off but seems that a T55 torx is small and a 60 is too big. I've been told it could be a T55P. Any ideas on this? The next issue, all the fins are missing off the impeller. It's plastic but still could clog something up. Thinking of flushing it out but how to go about it. Well thanks for any ideas.