The Toyota Y engine is a series of overhead valve straight-four petrol engines manufactured by Toyota from 1982 through 1996. The Y engine has mostly been used in commercial and off-road vehicles. The valve arrangement from the Toyota K engine is interchangeable with this engine. Translated from Japanese Wiki ja:トヨタ・Y型エンジン

1Y

There is also the 1Y-J, with the "J" suffix meaning that the engine is built to meet emission standards for light commercial vehicles. Applications:

2Y

The 2Y engine is an OHV, eight valve construction just like the 1Y. It shares that engine's 86 mm bore, but stroke is increased to 78 mm for a displacement of 1812 cc. There are also 2Y-J and 2Y-U engines with differing emissions control equipment. Applications:

2Y-P

Applications:

3Y

There is also the emissions cleaned 3Y-U engine. A version of the 3Y is built by the Shenyang Xinguang-Brilliance Automobile Engine Co. in China as the 4G20B; this engine meets the Euro IV emissions standards. Applications:

3Y-C

This is the low emissions carburetted motor with catalytic converter exhaust system Applications:

3Y-E

Applications:

3Y-EU

Applications:

3Y-P

Applications:

3Y-PU

Applications:

3Y-PE

Applications:

4Y

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 at 4400 rpm (SAE net) and 18.6 kgm at 3000 rpm.