These are the same issues that effect the PD 150 ARL engine, cam follower/lifter tops wearing thin and then breaking up, google cam wear on a PD 150
http://www.google.co.uk/#hl=en&source=hp&q=cam+wear+pd+150&btnG=Google+Search&meta=&aq=f&oq=cam+wear+pd+150&fp=c6c9946001627c7b
BTW it isn't a rare problem, there are upgraded cam followers (harder) IIRC they are a different colour (black)
http://www.google.co.uk/#hl=en&source=hp&q=cam+wear+pd+150&btnG=Google+Search&meta=&aq=f&oq=cam+wear+pd+150&fp=c6c9946001627c7b
BTW it isn't a rare problem, there are upgraded cam followers (harder) IIRC they are a different colour (black)
