The Toyota B engine family was a series of inline-four diesel engines.

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Toyota also had a 3.4 L (3389 cc) inline-six gasoline engine from 1937 to 1947 that was also called the B engine. The earlier engine was used in early Toyota cars and trucks and in the first version of the Land Cruiser when it was known as the BJ Jeep. The later engine was used in later versions of the Land Cruiser. The two engines are unrelated and were not made at the same time.

Toyota made 5 generations of the B family engines, each one identified with a number before the B letter. Also, Toyota uses a series of letters to identify technical improvements to their engines:

- The number 1 (one) before the number of the engine model means that the engine uses direct injection, otherwise, indirect injection

- The F letter after the B letter means that the engine is multivalvular. Since the B family are inline-fours, that means that the engine uses 16 valves.

- The T letter, means that the engine is turbocharged

- The E letter, means that the engine is electronically controlled engine control unit (ECU)

For example, the 15B-FTE Engine is the fifth generation of the B engines, comes with 16 valves, is turbocharged, direct-injected and uses an ECU.

In August 1988, Toyota released re-designed B series engines (specifically the B, 3B and 11B) with a number of improvements. A mono-block design (with no cylinder liners) was adopted. An onboard, timing gear driven vacuum pump replaced a previously alternator-driven vacuum pump (Later a gear-driven power steering pump would be added to the 3B, 14B and 15B platforms). Camshafts gained larger bearing journals and roller lifters replaced earlier solid lifters. Pushrod inspection galleries disappeared to make a more solid engine block. The flywheel changed from 6 to 8 bolts and a PCV hose replaced the road draft tube. Toyota does not make a distinction in the naming of these engines, but in user communities the August 1988-on 3B is referred to as the '3B-II'.

The B is a 3.0 L inline-four eight-valve OHV diesel engine. Compression ratio is 21:1. Output is 80 PS (59 kW) at 3,600 rpm, with 19.5 kg⋅m (191 N⋅m; 141 lb⋅ft) of torque at 2,200 rpm. Later versions claim 85 PS (63 kW) and 20 kg⋅m (196 N⋅m; 145 lb⋅ft). Versions of the B made from August 1988 onwards are informally referred to as a 'B-II' and share the same engine block casting as the 11B.

Applications

• Land Cruiser 40
• Dyna 3rd, 4th, 5th generation
• Toyoace 5th generation
• Daihatsu Delta V9/V12-series
• 1978-19?? Hino Ranger 2 (V10)^[1]

The 2B is a 3.2 L inline 4 eight valve OHV diesel engine. Compression ratio is 21:1. Output is 93 PS (68 kW) at 2,200 rpm, with 21.9 kg⋅m (215 N⋅m; 158 lb⋅ft) of torque at 2,200 rpm.^{[citation needed]}

Applications

• Land Cruiser (BJ41/44 JDM)
• Coaster (BB10/11/15)

The 3B is a 3.4 L inline 4 eight valve OHV diesel engine. Compression ratio is 20:1. Output is 90 hp (67 kW) at 3,500 rpm with 160 ft·lbf (217 N·m) of torque at 2,000 rpm. The 3B was offered with both in-line and rotary diesel injection pumps. Versions of the 3B made from August 1988 onwards are informally referred to as a '3Bii' and share the same engine block casting as the 14B. All post August 1988 3Bs have rotary diesel injection pumps.

Applications

• Dyna 4th, 5th, 6th generation
• Toyoace 4th, 5th generation
• Landcruiser 40/60/70
• Coaster 2nd, 3rd generation

The 4B is a 3.7-litre inline-four eight-valve OHV diesel engine of the swirl chamber type. The 4B was only sold on the Japanese domestic market. The 4B was released in 1999 at the time that production of the 3B ceased. Unusually, the indirect injection 4B was released considerably later than the equivalent direct injection 14B engine, which was released in 1988.

The 11B was released in 1985 and is a direct injection version of the original B engine. Power is 90 PS (66 kW) and max torque is 21.0 kg⋅m (206 N⋅m; 152 lb⋅ft). In August 1988 an updated version of the 11B was released, similar to the informally named 'Bii' and '3Bii'.

The 13B is a direct injection version of the 3B engine. Output for 1985 versions is 100 PS (74 kW) and 24.0 kg⋅m (235 N⋅m; 174 lb⋅ft).^[2]

The 14B is a 3.7 L (3661 cc) inline-four eight-valve OHV direct injection diesel engine.^[3] Compression ratio is 18:1. Output is 98 hp (72 kW) at 3,400 rpm with 177 lb·fts (240 N·m) of torque at 1,800 rpm. The 14B was launched in 1988 at the same time as the updated B, 3B and 11B. Unlike the 11B and 13B engines, the 14B did not evolve from an earlier indirect-injection engine. All 14B engines have rotary diesel injection pumps.

Applications

• Toyota Dyna/Toyoace
• Toyota Coaster
• Toyota Bandeirante
• Daihatsu Delta V11-series