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.
In August 1988, Toyota released re-designed B series engines (specifically the B, 3B and 11B) with a number of improvements.
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'.
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.
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.
Applications The 4B is a 3.7-litre inline-four eight-valve OHV diesel engine of the swirl chamber type.
At this time, the 13B received an 8 bolt flywheel and larger camshaft, but retained cylinder liners and pushrod inspection galleries.
Applications The 14B is a 3.7 L (3661 cc) inline-four eight-valve OHV direct injection diesel engine.
Applications The 14B-T is a 3.7 L (3661 cc) inline-four eight-valve OHV direct injection turbocharged diesel engine.
Based on a 14B-T, it is presumed to be bored out to a 4.1 L (4104 cc) inline 4 cylinder, eight valve, OHV, direct (mechanical) injection, intercooled, turbocharged diesel engine.
The 15B-F is a 4.1 L (4104 cc) inline 4 cylinder, sixteen valve, OHV, direct injection diesel engine.
Applications The 15B-FT is a 4.1 L (4104 cc) inline 4 cylinder, sixteen valve, OHV, mechanical injection, turbo, intercooled diesel engine.
Applications The 15B-FTE is a 4.1 L (4104 cc) inline 4 cylinder, sixteen valve, OHV, electronic direct injection, turbo, intercooled diesel engine.