Engines: Beta 25 (BD902)This page has a variety of useful downloadable PDFs including the engine Product Brochure, Mechanical Diagram, and Operators Maintenance Manual. And this engine features Kubota's latest E-TVCS technology and Half Float Head Cover. See below for more information on these advanced technologies. Includes specifications, performance charts, engine photos, options, panel photos, and metric mechanical diagrams for engine models BZ602 and the BD902. Both US and Metric dimensions. Check which transmission and alternator configuration you are specifying. Other diagrams available on request. For engine models Beta 10, BZ482, BZ602 (Beta 16), BD722, and BD902 (Beta 25). You will need Adobe Acrobat Reader or equivalent to view the PDFs. Click here to download the if you don't already have it. Technology for a Cleaner EnvironmentKubota's proprietary TVCS (Three Vortex Combustion System) obtains an optimum air/fuel mixture by generating three intense swirling air flows (vortexes) within the spherical-combustion (swirl) chamber.TVCS has been a major feature of all Kubota Diesel Engines. Kubota then introduced an upgraded TVCS that added a special concave recess on the piston head to force compression air in the swirl chamber and to smooth combustion gas exhaust. Now, the E-TVCS, based on the latest TVCS, is aimed at a drastic emission reduction.Introducing E-TVCSE-TVCS produces far less soot, HC and CO thanks to a better match between the injection nozzle throat and the concave recess on the piston head. E-TVCS meets all applicable emissions regulations world wide.The injection pump and nozzle are better matched with the combustion chamber to reduce NOx emissions.Half Float Valve Cover - More Comfort from Less NoiseIn order to improve the already well-established lower noise levels of the existing engines, Kubota added a half float head cover, and a MoS2 coated piston to these engines.The rubber ring seals and isolates vibration and reduces the noise from the crankcase. As a result, the noise level is 1.0~1.5dBA lower than that of the conventional models in the same class.Other FeaturesMoS2 Coated Piston - Sulfureted molybdenum coating enables clearance reduction between the piston and the cylinder liner, thus optimizing the oval shape ratio and decreasing the piston slapping noise.Quick Start ups - Super glow system comes as standard equipment to shorten preheating time and quicken engine start up in cold temperatures.Highly Reliable Engine - Based on Kubota's original sturdy design, the engine promises great reliability and long service life. . Dealer Locator. When ordering an engine we always recommend that you talk to your local Beta Marine Dealer / Distributor about what you are looking for, so that you can agree a specification of the engine and accessories you require and they will then quote you.. Beta Marine Diesel Marine Propulsion Engines & Marine Generating Sets. Since 1987 Beta Marine has developed an enviable reputation for providing quiet and smooth running marine diesel engines and generating sets to suit a wide range of applications..