Toyota F engine

The Toyota F series engine was a series of OHV inline-6-cylinder engines produced by Toyota between 1955 and 1992. They are known for their high amount of torque at low RPM, massive cast-iron blocks and heads and also their high reliability. The F Engine had one of the longest production runs of any Toyota engine. The F engines all incorporate overhead valves actuated by pushrods from a gear driven camshaft in the lower portion of the engine. The engine was first introduced in the Land Cruiser, and in many countries, was the only engines offered in the Landcruiser until 1993. Although it's commonly badged as the Land Cruiser engine, it was used in a variety of other large truck applications as well, such as in fire trucks and the Toyota FQ15 trucks. It was also used in the Crown-based Japanese police patrol cars FH26 and FS20-FS50.

Engine Revisions

F

The F engine is a 3.9-liter, 75/93 kW (105/125 hp), carburated gasoline engine that is capable of 261/289 N·m (189/209 lb·ft) of torque at 2000 RPM; the difference in power and torque is different depending on the export destination. The original design was started in the early 1950s when Toyota had begun to export their vehicles internationally.

The F engine block, crankshaft and lower end assembly is loosely based on the 1939-63 G.M.C. L6 OHV 235 engine but with a taller deck (rather than the similar but smaller Chevrolet 1937-63 Gen-2 L6 OHV engine), and built under license. The cylinder head and combustion chamber is derived from the Chevrolet L6 OHV "stovebolt" engine, slightly scaled up. The general idea was consumers would feel comfortable with the engine since it was a familiar design and had a proven track record. None of the bottom end of the engine is interchangeable with these engines.

The F engine replaced the early 3.4-liter B gasoline engine introduced in 1937 (not to be confused with the 2.9-liter B diesel engine introduced much later). The early B engine was based on the original 1929-36 Chevrolet Gen-1 207 inline-6, not the later 1937-63 Gen-2 216, 235 etc. engine.

F (9/73-12/1974)

The F (9/73-12/1974) engine is a 3.9-liter, 75/93 kW (105/125 hp), carburated gasoline engine that is capable of 261/289 N·m (189/209 lb·ft) of torque at 2000 RPM; the major difference between the F and the F.5 is the oiling system. The F.5 (09/1973-12/1974) uses the same oiling set-up and configuration as its successor the 2F.

2F

The second version of the engine, called the 2F, was introduced in 1975. There are a few differences between the F and 2F, i.e., a larger bore in the 2F, removing one oil ring and forcing the oil to travel through the oil filter before the engine.

3F/3F-E

The 3F was introduced in 1985, but did not become available in the United States until 1988. Differences from the 2F engine include a modified cylinder head to reduce warping and separation from inlet and exhaust manifolds, the introduction of electronic fuel injection (EFI) in some markets, a vastly improved emissions system, and a smaller displacement resulting from a shorter piston stroke. The displacement decreased from 4.2 liters to 4 liters, but even with this improvement, the engine power increased by 15 kW (20 hp) and torque increased by 14 N·m (10 lb·ft). As a result of these changes to the engine design the redline was increased, allowing a wider powerband which made this engine far more suitable for on-road travel.

In 1992, the F series engines, after almost 45 years, finally ceased production. In 1993, the F series was replaced by the dual overhead cam (DOHC) 1FZ-FE engine.

Due to the low rpm design and cast iron construction of these engines, it is not uncommon to see them reach over 480,000 km (300,000 miles) before needing a major overhaul.