I recently bought a President 37 with 2 Lehman 120s and a Westerbeke genny which currently sits on the hard in the Bahamas. I need to take tools and parts with me from Florida to prepare it for the trip to the states. I am purchasing a set of tools for the boat. Which size tools are required to work on these engines? SAE? Or metric?
SAE, but it depends upon how long the engines have been sitting. If the engines started during a pre-purchase survey you are in good shape. Change the fuel filters and go. Bring extra filters and extra impellers.
If the engines have not been run, then things become more complex. You have the engines, transmissions, and packing glands to check. Biggest issue is corrosion of oil coolers and heat exchanger and cracked hoses. Lehman's are simple and easy to work on. Change the filters, bleed lines, and they usually run. I would replace the impellers due to their critical function. Carry an extra fan belt. Download a repair manual just in case.
Transmissions should be OK. If oil is frothy and milky, then you have a bad cooler. Easy replacement, just need lots of fluid to clean out contaminated fluid.
Packing glands may be dried out. You will need 2 packing gland wrenches to replace or tighten.
You should be able to maintain engines with a set of wrenches, a set of screwdrivers, med pair of vice grips, med adjustable wrench, and an ohmmeter. An IR thermal gun is handy to check engine block temps.
Run the boat hard for a day before crossing and any problems will quickly become apparent.