Hi ted20
The Howard -Clifford Hako was only supplied with a single sheet of instructions as far as I know. I am not sure if they ever produced a workshop manual, I have a Hako that runs really well, and I might have a JLO book somewhere, Rather busy this weekend, but I will look when I have 5 minutes.
Best of luck with the engine, sounds like a diesel soak is called for !!
regards
Chris