The 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 code | F |
| Layout | Four stroke, Inline-6 (Straight-6) |
| Fuel type | Gasoline |
| Production | 1946-1975 |
| Displacement | 3.9 L, 3,878 cm3 (236.6 cu in) |
| Fuel system | Down draft, single barrel carburetor (early), down draft, two-barrel (later) |
| Power adder | None |
| 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 order | 1-5-3-6-2-4 |
| Dimensions (L x H x W): | – |
| Weight | – |
Cylinder block
| 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 (4.00 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: | Top | 0.030-0.070 mm (0.0012-0.0028 in) |
| Second | 0.020-0.060 mm (0.0008-0.0024 in) | |
| Oil №1 | 0.020-0.060 mm (0.0008-0.0024 in) | |
| Oil №2 | 0.020-0.065 mm (0.0008-0.0026 in) | |
| Piston ring end gap: | Top | 0.200-0.400 mm (0.0079-0.0157 in) |
| Second | 0.150-0.350 mm (0.0059-0.0138 in) | |
| Oil №1 | 0.150-0.350 mm (0.0059-0.0138 in) | |
| Oil №2 | 0.150-0.350 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: | INTAKE | 46.0 mm (1.811 in) |
| EXHAUST | 37.5 mm (1.4764 in) | |
| Valve length: | INTAKE | 124.5-125.1 mm (4.9016-4.9252 in) |
| EXHAUST | 124.7-125.3 mm (4.9094-4.9331 in) | |
| Valve stem diameter: | INTAKE | 7.970-7.985 mm (0.3138-0.3144 in) |
| EXHAUST | 7.960-7.975 mm (0.3134-0.314 in) | |
| Valve spring free length: | 51.5 mm (2.0276 in) | |
| Camshaft lobe height: | INTAKE | 38.360-38.460 mm (1.5102-1.5142 in) |
| 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) |
|
Maintenance data
| Valve clearance (Cold) | |
| Intake valve | 0.20 mm (0.008 in) |
| Exhaust valve | 0.350 mm (0.014 in) |
| Oil system | |
| Recommended engine oil | 10W-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 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 ft·lb) |
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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