Toyota F

Toyota FThe Toyota F is a 3.9 L (3,878 cc, 236.6 cu·in) straight-six, four-stroke cycle natural aspirated gasoline engine from the Toyota F-family. The engine was manufactured by the Toyota Motor Corporation from 1949 to 1975.

The Toyota F engine features a cast-iron block, cast-iron cylinder head with a gear driven camshaft and two valves per cylinder (12 in total). A 90.0 mm (3.54 in) cylinder bore and 101.6 mm (4.00 in) piston stroke give the F engine a total of 3878 cc of displacement. The F engine used down draft, single barrel carburetor for the early version, and down draft, two-barrel carburetor for the later version.

This engine produced from 102.0 PS (75 kW; 100.6 HP) to 126.5 PS (93 kW; 124.7 HP) of horsepower and from 261 N·m (26.6 kg·m, 192.4 ft·lb) at 2,000 rpm to 289 N·m (29.5 kg·m, 213 ft·lb) at 2,000 rpm of peak torque (depending on application and market).

The breakdown of the engine code is as follows:

  • F – Engine family

General information

Engine Specifications
Engine codeF
LayoutFour stroke, Inline-6 (Straight-6)
Fuel typeGasoline
Displacement3.9 L, 3,878 cm3 (236.6 cu in)
Fuel systemDown draft, single barrel carburetor (early), down draft, two-barrel (later)
Power adderNone
Max. horsepower From 102.0 PS (75 kW; 100.6 HP)
to 126.5 PS (93 kW; 124.7 HP)
Max. torque From 261 N·m (26.6 kg·m, 192.4 ft·lb) at 2,000 rpm
to 289 N·m (29.5 kg·m, 213 ft·lb) at 2,000 rpm
Firing order1-5-3-6-2-4
Dimensions (L x H x W):

Cylinder block

Cylinder block
Cylinder block alloyCast-iron
Compression ratio:6.4:1 (until 1954), 6.8:1, 7.5:1, 7.8:1
Cylinder bore:90.0 mm (3.54 in)
Piston stroke:101.6 mm (4.00 in)
Number of piston rings (compression / oil):2 / 2
Number of main bearings:4
Cylinder inner diameter (standard):89.995-90.045 mm (3.5431-3.5451 in)
Piston skirt diameter (standard):89.955-90.005 mm (3.5415-3.5435 in)
Piston ring groove clearance:Top0.030-0.070 mm (0.0012-0.0028 in)
Second0.020-0.060 mm (0.0008-0.0024 in)
Oil №10.020-0.060 mm (0.0008-0.0024 in)
Oil №20.020-0.065 mm (0.0008-0.0026 in)
Piston ring end gap:Top0.200-0.400 mm (0.0079-0.0157 in)
Second0.150-0.350 mm (0.0059-0.0138 in)
Oil №10.150-0.350 mm (0.0059-0.0138 in)
Oil №20.150-0.350 mm (0.0059-0.0138 in)
Crankshaft main journal diameter: Front: 66.970-67.000 mm (2.6366-2.6378 in)
2nd: 68.470-68.500 mm (2.6957-2.6969 in)
3rd: 69.970-70.000 mm (2.7547-2.7559 in)
Rear: 71.470-71.500 mm (2.8138-2.8150 in)
Crankpin diameter:53.980-54.000 mm (2.1252-2.126 in)

Cylinder head

Cylinder head alloy:Cast-iron
Valve Arrangement:OHV, gear drive
Valves:12 (2 valves per cylinder)
Intake duration:
Exhaust duration:
Valve head diameter:INTAKE46.0 mm (1.811 in)
EXHAUST37.5 mm (1.4764 in)
Valve length:INTAKE124.5-125.1 mm (4.9016-4.9252 in)
EXHAUST124.7-125.3 mm (4.9094-4.9331 in)
Valve stem diameter:INTAKE7.970-7.985 mm (0.3138-0.3144 in)
EXHAUST7.960-7.975 mm (0.3134-0.314 in)
Valve spring free length:51.5 mm (2.0276 in)
Camshaft lobe height:INTAKE38.360-38.460 mm (1.5102-1.5142 in)
EXHAUST38.250-38.350 mm (1.5059-1.5098 in)
Camshaft journal diameter: Front: 47.955-47.975 mm (1.8880-1.8888 in)
2nd: 46.455-46.475 mm (1.8289-1.8297 in)
3rd: 44.955-44.975 mm (1.7699-1.7707 in)
Rear: 43.455-43.475 mm (1.7108-1.7116 in)

Maintenance data

Valve clearance (Cold)
Intake valve0.20 mm (0.008 in)
Exhaust valve0.350 mm (0.014 in)
Oil system
Recommended engine oil10W-30
Oil type API
Engine oil capacity (Refill capacity)8.0 L (8.45 US. qt, 7.04 Imp. qt.)
Oil change interval, km (miles)10,000 (6,000)
Ignition system
Spark plugDenso W17ES, NGK B5ES
Spark plug gap0.8 mm (0.0315 in)
Spark plug torque18 N·m (1.8 kg·m, 13.3 ft·lb)

Vehicle applications

ModelYears Produced
Toyota Model FL Bus1949
Toyota Model FY Bus1951
Toyota FB60/60C Bus1954
Toyota FB70/70C Bus
Toyota FB80/80C Bus
Toyota FB100 Bus1964
Toyota FR Bus1953
Toyota BM (FM) Truck 4t1949
Toyota FX Truck 4t1951
Toyota Model FA Truck 4.5t1954
Toyota FA5 Truck 5t1954-1956
Toyota FA60 Truck 5t1956-1958
Toyota FA70 Truck 5t1958-1959
Toyota FA80 Truck 5-6t1959
Toyota FA100/110/115 Truck 5-6t1964
Toyota BS (FS) Truck 4t1949-1950
Toyota FZ Truck 2.5t1951-1953
Toyota FC Truck 2.5t1954-1956
Toyota FC60 Truck 2.5t1956-1958
Toyota FC70 Truck 2.5t1958-1959
Toyota FC80 Truck 3t1959-1964
Toyota FC100 Truck 3t1964-
Toyota FA115C Truck 3t
Toyota FQ10 3/4t Weapon Carrier 3-4t
Land Cruiser FJJ1954-1955
Land Cruiser 20-series1955-1959
Land Cruiser 40-series1960-1975
Land Cruiser 551967-1975
Land Patrol FX261957-1959
Land Patrol FC40
Toyota FS45V
Toyota FS55V
Toyota FH26
Massy Dyna FC10
Author: Sergei Wers
About: Co-founder and CEO of a multi-brand auto repair shop (engine repair, chassis repair, body repair and painting) for over 15 years. I have been developing internet sites with technical specifications for more than seven years.

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