The Toyota F is a 3.9 L (3878 cc, 236.6 cu·in) straight-six, natural aspirated four-stroke liquid-cooled internal combustion vertical gasoline engine, manufactured by Toyota from 1949 to 1975.
A 90.0 mm (3.54 in) cylinder bore and 101.6 mm (4 in) piston stroke give the F engine a total of 3878 cc of displacement. The compression ratio rating is 6.4:1 until 1954, 6.8:1, 7.5:1 or 7.8:1 for later vesion.
This engine produced from 102.0 PS (75 kW; 100.0 HP) to 126.5 PS (93 kW; 125.0 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, 213.0 ft·lb) at 2,000 rpm of torque.
The Toyota F features:
- Cast-iron cylinder block and head
- OHV design
- Ignition coil and contact breaker ignition system
- Down draft, single barrel carburetor (early), down draft, two-barrel (later)
- Forced lubrication lubrication system
- Liquid cooling system
- Electric starter
General information
| Engine Specifications | |
| Engine model | F |
| Engine type | 4-stroke, OHV, straight-six |
| Displacement | 3.9 L, 3,878 cm3, (236.6 cu·in) |
| Max. horsepower | From 102.0 PS (75 kW; 100.0 HP) to 126.5 PS (93 kW; 125.0 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, 213.0 ft·lb) at 2,000 rpm |
| Cooling system | Liquid-cooled |
| Lubricating system | Forced lubrication |
| Ignition system | Coil with contact breaker |
| Fuel system | Down draft, single barrel carburetor (early), down draft, two-barrel (later) |
| Fuel used | Gasoline |
| Starting system | Electric starter |
| Firing order: | 1-5-3-6-2-4 |
| Dimensions (L x W X H) | – |
| Dry weight | – |
Cylinder Block and Head
| Cylinder block | |
| Cylinder block alloy: | Cast-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 in) |
| Cylinder internal diameter (standard): | 89.995-90.045 mm (3.5431-3.5451 in) |
| Piston skirt outer diameter (standard): | 89.955-90.005 mm (3.5415-3.5435 in) |
| Number of piston rings (compression / oil): | 2/2 |
| Ring groove clearance (Top): | 0.030-0.070 mm (0.0012-0.0028 in) |
| Ring groove clearance (Second): | 0.020-0.060 mm (0.0008-0.0024 in) |
| Ring groove clearance (Oil №1): | 0.020-0.060 mm (0.0008-0.0024 in) |
| Ring groove clearance (Oil №2): | 0.020-0.060 mm (0.0008-0.0026 in) |
| Ring end gap (Top): | 0.200-0.400 mm (0.0079-0.0157 in) |
| Ring end gap (Second): | 0.150-0.350 mm (0.0059-0.0138 in) |
| Ring end gap (Oil №1): | 0.150-0.350 mm (0.0059-0.0138 in) |
| Ring end gap (Oil №2): | 0.150-0.350 mm (0.0059-0.0138 in) |
| Number of main bearings: | 4 |
| 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 journal diameter: | 53.980-54.000 mm (2.1252-2.126 in) |
| Cylinder head | |
| Cylinder head alloy: | Сast-iron |
| Valve arrangement: | OHV, gear driven |
| Valves: | 2,(12 valves in total) |
| Valve head diameter (INTAKE): | 46.0 mm (1.811 in) |
| Valve head diameter (EXHAUST): | 37.5 mm (1.4764 in) |
| Valve head face angle (INTAKE): | 45° |
| Valve head face angle (EXHAUST): | 45° |
| Valve length (INTAKE): | 124.5-125.1 mm (4.9016-4.9252 in) |
| Valve length (EXHAUST): | 124.7-125.3 mm (4.9094-4.9331 in) |
| Valve steam diameter (INTAKE): | 7.970-7.985 mm (0.3138-0.3144 in) |
| Valve steam diameter (EXHAUST): | 7.960-7.975 mm (0.3134-0.314 in) |
| Valve spring free length (INTAKE): | 51.5 mm (2.0276 in) |
| Valve spring free length (EXHAUST): | 51.5 mm (2.0276 in) |
| Camshaft lobe height (INTAKE): | 38.360-38.460 mm (1.5102-1.5142 in) |
| Camshaft lobe height (EXHAUST): | 38.250-38.350 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) |
| Valve lifter outside diameter: | 25.097-25.120 mm (0.9881-0.9894 in) |
| Valve rocker shaft outer diamet: | 18.479-18.490 mm (0.7275-0.728 in) |
Service Data
| Valve clearance | |
| Intake valve clearance: | 0.20 mm (0.008 in) |
| Exhaust valve clearance: | 0.35 mm (0.014 in) |
| Oil system | |
| Lubrication system: | Forced lubrication |
| Oil capacity: | 8.0 L (8.45 US. qt, 7.04 Imp. qt.) |
| Fuel system | |
| Type: | Down draft, single barrel carburetor (early), down draft, two-barrel (later) |
| Ignition system | |
| Type: | Battery, coil and contact breaker. |
| Ignition timing: | 7° B.T.D.C. at 650 rpm |
| Spark plug: | Denso W17ES, NGK B5ES |
| Spark plug gap: | 0.8 mm (0.0315 in) |
| Spark plug torque: | 18 N·m (1.8 kg·m, 13.3 lb·ft) |
| Ignition coil air gap | 0.45 mm (0.0177 in) |
Vehicle applications
| Model | Years Produced |
| Toyota Model FL Bus | 1949 |
| Toyota Model FY Bus | 1951 |
| Toyota FB60/60C Bus | 1954 |
| Toyota FB70/70C Bus | – |
| Toyota FB80/80C Bus | – |
| Toyota FB100 Bus | 1964 |
| Toyota FR Bus | 1953 |
| Toyota BM (FM) Truck 4t | 1949 |
| Toyota FX Truck 4t | 1951 |
| Toyota Model FA Truck 4.5t | 1954 |
| Toyota FA5 Truck 5t | 1954-1956 |
| Toyota FA60 Truck 5t | 1956-1958 |
| Toyota FA70 Truck 5t | 1958-1959 |
| Toyota FA80 Truck 5-6t | 1959 |
| Toyota FA100/110/115 Truck 5-6t | 1964 |
| Toyota BS (FS) Truck 4t | 1949-1950 |
| Toyota FZ Truck 2.5t | 1951-1953 |
| Toyota FC Truck 2.5t | 1954-1956 |
| Toyota FC60 Truck 2.5t | 1956-1958 |
| Toyota FC70 Truck 2.5t | 1958-1959 |
| Toyota FC80 Truck 3t | 1959-1964 |
| Toyota FC100 Truck 3t | 1964- |
| Toyota FA115C Truck 3t | – |
| Toyota FQ10 3/4t Weapon Carrier 3-4t | – |
| Land Cruiser FJJ | 1954-1955 |
| Land Cruiser 20-series | 1955-1959 |
| Land Cruiser 40-series | 1960-1975 |
| Land Cruiser 55 | 1967-1975 |
| Land Patrol FX26 | 1957-1959 |
| Land Patrol FC40 | – |
| Toyota FS45V | – |
| Toyota FS55V | – |
| Toyota FH26 | – |
| Massy Dyna FC10 | – |
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