The Toyota 4Y is an OHV eight-valve engine that has a complete capacity of 2.2 L (2,237 cc), with bore and stroke dimensions of: 91 mm x 86 mm (3.58 in x 3.39 in). This engine was available either carburetted (4Y) or fuel injected (4Y-E, called the GW491Q/LJ491Q and also 4G22B for Chinese manufacture). As fitted to a 1989 Daihatsu Delta truck, the carburetted 4Y produces 70 kW (95 PS; 94 hp) at 4400 rpm (SAE net) and 18.6 kg⋅m (182 N⋅m; 135 lbf⋅ft) at 3000 rpm.

Any powerful engine has to have a robust total piston displacement, and it’s good to know that the Toyota 4Y has a 2237cc, with an OHV valve mechanism and a wedge shape combustion chamber type. There’s a 4-cycle-water-cooled cooling system in it that makes it easy for the engine to run at its maximum, optimal speed. As if that’s not impressive enough, we should also state here that there’s a 44kW (@2570rpm) maximum output (gasoline) for this engine, with a 165Nm (@2570rpm) maximum torque (gasoline). At dry weight, this engine weighs at about 126 kg, with its fuel set-up being gasoline/LPG.

Because of the fact that Aisan is legally under the autonomy of Toyota group, it would not be a surprise that its ignition parts and electrical system are created by the Aisan brand, with the support of Denso. In fact, most of the engine and surrounding components of 4Y come from Toyota and Toyota-owned suppliers.

History of Toyota 4Y

The revolutionary innovation of the Toyota 4Y could essentially be traced back to when inventor Sakichi Toyoda developed completely the automatic loom in 1926, which has been the foundation for Toyota Industries for many years now. Since the beginning of the commitment of Toyota Industries for continuous innovation and excellence in service, the roots of the Toyota 4y has been honed in the heart of Toyota’s internal combustion forklifts. This has led to giving Toyota the reputation of being the leader in creating some of the most dependable pieces of solid equipment available in the market. It may even be said that the 4Y Engine has helped Toyota forklifts reach an outstanding record of being able to deliver 35,000 life cycle operating hours with incredible smoothness and ease. There are even records stating that some engines have reached an impressive 80,000+ hours.

It should also be added that it was in 1934 that Toyota established its first market-ready automobile engine to be followed in 1956 when the company began manufacturing industrial engines. It was then in 1986 that the Toyota 4Y engine had formally been introduced.

In 2006, Toyota started to become known as the world’s most eco-friendly or cleanest I.C. forklift that features the 4Y. This remarkable record continued to go on until in 2016, Toyota again was acknowledged to be a producer of more than 150 million engines and 3 million of these cars have all been Toyota 4Ys.

It is all these components that have warranted Toyota with the excellent and reliable reputation that it enjoys today. It is these dimensions and varied applications to various areas in the car industry that Toyota has been the leader in automative industries, especially in the forklift departments. With lift trucks, gas heat pumps (GHP) and combined heat and power (CHP) as applications of this engine, there is little doubt that Toyota Industries will continue to be a leader in the gasoline and diesel engines enterprise.

This successful track record will definitely grow beyond the current 50 years of success that it currently enjoys. It is also an added credentials to the 4Y engines that Toyota has been in the record for only delivering cutting-edge technologies that go beyond standard vehicles. From diesel engines to gasoline engines, Toyota engines have been often backed with the most sophisticated researchers and analysts that currently generate unmatched sales success for Toyota, making it a consistent No. 1 brand.

Engine

• OHV eight-valve
• Capacity: 2.2 L (2,237 cc)
• Bore and stroke: 91 mm × 86 mm (3.58 in × 3.39 in)

This engine was available either carburetted (4Y) or fuel injected (4Y-E, called the 491Q-ME for Chinese manufacture). As fitted to a 1989 Daihatsu Delta truck, the carburetted 4Y produces 70 kW (95 PS; 94 hp) at 4400 rpm (SAE net) and 18.6 kg⋅m (182 N⋅m; 135 lbf⋅ft) at 3000 rpm.

Also used in:

• 1987.09 - 1995.12 Toyota Crown (YS132, overseas specifications)
• Toyota Van (Town Ace overseas specification, Tarago in Australia)
• Hiace third generation (overseas specification)
• 1979-1988 Toyota Stout (YK110)
• Daihatsu Delta
• 1993-1995 Daihatsu Rocky F95
• Toyota Industries forklifts
• Toyota 4Runner (Australia)
• Volkswagen Taro
• 1985-1993 Toyota Hilux (South Africa)

Basic Specifications

Torqe Specifications

Piston Specifications

Rings Specifications

Crankshaft Specifications

CamShaft Specifications

Valves Specifications