The Ferris IS4500Z runs the 88 mm Yanmar three-cylinder, and we stock it in both fuel systems - mechanical injection and electronic common rail, new surplus and rebuilt. Which one you need comes down to what is on your data plate, not what is on the machine badge.
The Ferris IS4500Z is a commercial diesel zero-turn mower used by landscaping contractors and grounds crews across the United States. It is powered by the Yanmar 88 mm-bore 3-cylinder direct-injection diesel. Commercial mowers run at sustained full working rpm for long hours, so a correctly governed variable-speed mobile engine is essential.
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. Production years: 2005-2018. Rated output in this machine: approximately approx. 36 hp.
WHAT WE FIT TO YOUR MACHINE.
On a commercial mower the engine runs at full governed rpm for long hours driving the deck and hydrostatic drive. Pulleys, brackets, oil pan and cooling package are external and carry over from your old engine.
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.
WHAT WE NEED FROM YOU.
A photo of the engine data plate - model, suffix, serial - and confirmation that it is going into a Ferris IS4500Z. From that we work out the bore, the cylinder count and the fuel system, tell you what carries across from the old engine, and price you on the right core. Mechanical or common rail, new surplus or rebuilt, we have it.