Yanmar has just introduced a new common-rail diesel engine in the popular 400-500-hp range for larger cruising boats. The new in-line, six-cylinder 6LY440/400 is the fourth generation of classic Yanmars dating back to 1989, all designed specifically for marine use. Since it has the same slim block as earlier engines in the series, it’s a good choice for both OEM and refit applications. The new 5.8 litre engine develops 440-hp at 3300 rpm, getting extra boost from a water-cooled turbocharger; other engines in the series are rated at 400 and 370 hp. Like all Yanmars over 45 hp, the 6LY440/400…