We give the Volvo MD2020 Diesel engine a service. In part 1 of a 3-part series, PBO’s engine experts Stu and Laura Davies visit Maximus, the PBO Project Boat and inspect an 18-year-old engine from the Maxi 84 that’s been laid up in a boatyard for 2 years. Stu does an initial assessment and concludes it’s in pretty good nick. He considers what spares should you carry onboard, looks at the fuel system and explains how the fuel gauge works and how fuel is polished. Stu inspects the tank for diesel bug and finds evidence of old bug. He demonstrates how to stop the engine in an emergency and how to engage the gears from the engine itself. He checks the antifreeze, discusses what to do with rust, and how to tighten valves.