We carry the full range of Yanmar 3TNV88 engines for the Yanmar B50 - mechanical injection and electronic common rail, new surplus and rebuilt - and we build each core to the configuration your mini excavator needs. The Yanmar B50 is a 5-ton class compact excavator from Yanmar's B-series, powered by the 88 mm-bore 3-cylinder direct-injection diesel. A native Yanmar engine application. ENGINE SPECIFICATION. Three cylinder, four cycle, liquid cooled, vertical in-line. Direct injection, naturally aspirated. Bore and stroke 88 x 90 mm. Displacement 1.642 L (100.2 cu in). Around 36 hp at 3000 rpm at full speed, less in machines governed lower. Dry weight approximately 341 lb (154 kg). Rotation counterclockwise viewed from the flywheel end. Engine as fitted to this machine: 3TNV88 / 3TNE88. Production years: 1998-2008. Rated output in this machine: approximately approx. 36 hp. WHAT WE FIT TO YOUR MACHINE. On a mini excavator the core engine is only half the job. The bellhousing and flywheel have to mate to your hydraulic pump drive, the oil pan has to clear the undercarriage, and the throttle has to answer to the machine's engine control. Those are all external parts and they carry across from the engine you are pulling out - we build the core to suit. MECHANICAL OR COMMON RAIL - THIS IS THE ONE THING YOU MUST MATCH. The Yanmar 3TNV88 comes in two fuel systems and they are not interchangeable. MECHANICAL INJECTION uses a mechanical pump and governor, with no ECU or sensors - this is what most machines in the field run, and it is our standard stock. ELECTRONIC COMMON RAIL (HPCR) is ECU-controlled, fitted to machines built to the later emissions standards. We carry both, in new surplus and rebuilt. The suffix on your data plate - codes like -BKMS, -BPTB2, -QTB - does not mean a different engine. The core is the same across the family: same block, same crank, same 88 x 90 mm bore and stroke, same 1.642 L. The suffix tells you the fuel system and the accessory package. The accessories are external and swap; the fuel system is what has to match. Two other variants to know about: the 3TNV88F has an ELECTRONIC GOVERNOR with EGR and is a different engine again, and the 3TNV88-GGE is a fixed-speed GENERATOR engine, not a machine engine. There is also a 4-CYLINDER 4TNV88 that is not the same as this three-cylinder engine at all. Full breakdown of every variant, and how to read your data plate: see our Yanmar 3TNV88 engine buying guide. HOW TO ORDER THE RIGHT ONE. Send us a photo of your engine data plate - model number, suffix and serial - and tell us it is going into a Yanmar B50. We will confirm the bore, the cylinder count and the fuel system, tell you which accessories carry over from your old engine, and quote you on the correct core in mechanical or common rail, new surplus or rebuilt. If what you asked for is not right for the machine, we will say so before we take the order.