Perkins M92B is a 4 cylinder, in-line vertical, 4 stroke, water cooled, naturally aspirated diesel engine. Fresh water heat exchanger cooled engine with gear driven self priming raw water and fresh water pumps or keel cooling adaption. Fresh water cooled exhaust manifold, intake manifold and heat exchanger. The Perkins Marine M92B engine is the successor to the very successful M92. It has been inspired by and led by the future requirements of our customers to meet the needs of the marine industry. Built to the most demanding standards, the M92B engine meets all the requirements of both EC Stage 2 and USA EPA Tier 2 off-highway emissions legislation from 2004 and brings significant improvements over the M92 highly successful predecessor. The M92B is a quiet 4.4 litre unit delivering improved performance and reduced operating costs in an efficient package ideal for a range of marine applications. Service intervals are now set at 500 hours as standard and the warranty period has been extended to 2 years with 3 years on majors. In addition, fuel economy has improved by as much as 6%.