If you can't find a .pdf version of the manual, tell your local Perkins dealer you need manual # TPD1273. That is the 500 Series/Prima Workshop manual. I think list price is around $92 USD.
Dave - Download them from the sites that GordMay has posted. My file is about 14 mbs and will choke my email. This is where I originally got it from Gord anyway.
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It's kind of like tearing up $100 bills while standing in a cold shower.
My guess is that boatdiesel.com has a .pdf of it. Unfortunately you need to be a member to get it ($25/yr). I'm not a member, but maybe someone else is here and they could send to you.