RE: Boat/Engine Maintenence Forms
We have a maintenance and repair logbook that we bought (probably from West Marine) and it works pretty good as a basic list of what you've done with dates and engine hours . I also made up a form based on the forms we use to keep track of aircraft hours to track engine hours, total time, time since engine oil, oil filter, and fuel filter changes, time since injection pump oil changes, etc. It has a fairly large space for notes and we've taken to using this for trip notes as well as the technical information.
We bought a purpose-designed cruise logbook at the same time we got the maintenance book but we found we never used it so we got rid of it.