The Toyota 1HD-FT is a 4.20 l (4,164 cc, 254.1 cu-in) six cylinders, four-stroke cycle water-cooled turbocharged internal combustion diesel engine, manufactured by the Toyota Motor Corporation.
The Toyota 1HD-FT most known for its use in the Toyota Land Cruiser HDJ80. The 1HD-FT engine has a cast-iron block with 94.0 mm (3.7 in) cylinder bores and a 100.0 mm (3.94 in) piston stroke for a capacity of 4,164 cc (254.1 cu-in). Compression ratio rating is 18.6:1.
The motor has a cast iron cylinder head with a single overhead camshaft (SOHC) which is mounted on a three-layer steel laminate type head gasket.
The 1HD-FT engine is equipped with mechanical rotary fuel injection pump; central vertically mounted injectors and Toyota CT26 turbocharger with a boost pressure of 0.62 bar. The Toyota 1HD-FT produced 170 PS (125 kW; 167 HP) at 3,600 rpm of horsepower and 380 Nm (38.76 kg·m; 280.44 ft·lb) at 2,500 rpm of torque.
The breakdown of the engine code is as follows:
- 1 – 1nd generation engine
- HD – Engine family
- F – Economy narrow-angle DOHC
- T – Turbocharged
|Displacement||4.2L, 4,164 cc (254.1 cu in)|
|Power adder||Toyota CT26|
|Horsepower net||170 PS (125 KW; 167 HP) at 3,600 rpm|
|Torque output||380 Nm (38.76 kg·m; 280.44 ft·lb) at 2,500 rpm|
|Dimensions (L x H x W):||–|
The cylinder block has a monoblock high-strength cast-iron structure with the seven-bearing-support system. The 1HD-FT engine is equipped with a forged crankshaft with seven forged journals and twelve balance weights.
The 1HD-FT motor has carbon-steel connecting rods and an aluminum alloy piston for high strength, lightweight and good heat conductivity; two compression and one oil control rings. The cylinder bore is 94 mm (3.7 in), piston stroke is 100 mm (3.94 in) and compression ratio rating is 18.6:1.
|Cylinder block alloy||Cast iron|
|Cylinder bore:||94 mm (3.7 in)|
|Piston stroke:||100 mm (3.94 in)|
|Number of piston rings (compression / oil):||2 / 1|
|Number of main bearings:||7|
|Cylinder bore inner diameter:||94.000-94.010 mm (3.7001-3.7012 in)|
|Piston skirt diameter||93.845-94.855 mm (3.8947-3.8951 in)|
|Piston ring groove:||First||0.050-0.095 mm (0.0020-0.0037 in)|
|Second||0.060-0.100 mm (0.0024-0.0039 in)|
|Oil||0.030-0.070 mm (0.0012-0.0028 in)|
|Piston ring end gap:||First||0.270-0.470 mm (0.0106-0.0185 in)|
|Second||0.400-0.650 mm (0.0157-0.0256 in)|
|Oil||0.200-0.500 mm (0.0079 – 0.0197 in)|
|Piston pin outer diameter||33.000-33.012 mm (1.2992-1.2997 in)|
|Piston pin bore diameter||33.008-33.020 mm (12.995-1.3000 in)|
|Crankshaft main journal diameter:||66.994-67.000 mm (2.7953-2.7955 in)|
|Crankpin diameter:||58.982-59.000 mm (2.3221-2.3228 in)|
|Crankshaft center distance:||50.0 mm (1.9685 in)|
Main bearing cap tightening procedure and torque specs:
12 pointed head:
- Step 1: 103 Nm; 10.5 kg·m; 76 ft·lb
- Step 2: Turn all bolts 90°
6 pointed head:
- 18 Nm; 1.8 kg·m; 13 ft·lb
After securing bearing cap bolts, make sure crankshaft turns smoothly by hand.
Connecting rod bearing nut
- Step 1: 37 Nm; 3.75 kg·m; 27 ft·lb
- Step 2: Turn all bolts 90°
Crankshaft pulley bolt
- 430 Nm; 44.0 kg·m; 317 ft·lb
Flywheel (M/T) or Drive plate (A/T) fixing bolts
- 127 Nm; 13.0 kg·m; 94 ft·lb
The 1HDFT has a one-piece high-strength cast iron cylinder head which is mounted on a three-layer steel laminate type head gasket. The engine has single (SOHC) high-quality carbon steel camshaft and aluminum rocker arms. Each rocker uses bridges to actuate a pair of valves. The engine does not have glow plugs but is equipped with an intake glow screen heater.
The camshaft is driven by a timing belt and gears. The timing gear train included a hydraulic auto tensioner. Furthermore, the timing gear train drove the oil pump, vacuum pump, steering gear pump, injection pump, and camshaft.
The engine has OHV design with four valves per cylinder: two intake and two exhaust valves, which are made of special heat-resistant steel. Intake valves are 33.0 mm (1.2992 in) in diameter, and the exhaust valves are 30.5 mm (1.2007 in). Intake duration is 224° and exhaust duration is 246°.
The 1HD-FT engine had an aluminum intake manifold and cast iron exhaust manifold that was mounted on a five-layer steel laminate type exhaust manifold gasket.
|Cylinder head alloy||Cast iron|
|Valves:||24 (4 valves per cylinder)|
|Intake valves diameter:||33.0 mm (1.2992 in)|
|Exhaust valves diameter:||30.5 mm (1.2007 in)|
|Intake valves length:||126.85-127.45 mm (4.9941-5.0177 in)|
|Exhaust valves length:||126.43-127.03 mm (4.9775-5.0012 in)|
|Intake valve stem diameter:||6.970-6.985 mm (0.2744-0.2750 in)|
|Exhaust valves stem diameter:||6.960-6.975 mm (0.2740-0.2746 in.l|
|Camshaft journal diameter:||
1st: 34.969-34.985 mm (1.3767-1.3774 in)
Others: 27.986-27.998 mm (1.1018-1.1023 in)
|Intake cam lobe height:||48.498-48.598 mm (1.9094-1.9133 in)|
|Exhaust cam lobe height:||50.734-50.834 mm (1.9974-2.0013 in)|
Head tightening procedure and torque specs:
- Step 1: 69 Nm; 7.0 kg·m; 51 ft·lb
- Step 2: Turn all bolts 90°
- Step 3: Turn all bolts 90°
Camshaft bearing cap
- 25 Nm; 2.5 kg·m; 18 ft·lb
|Valve clearance (Cold)|
|Intake valve||0.17-0.23 mm (0.007-0.009 in)|
|Exhaust valve||0.47-0.53 mm (0.019-0.021 in)|
|Standard||35.0 kg/m2 (3,432 kPa, 498 psi) / 250 rpm|
|Minimun||25.0 kg/m2 (2,452 kPa, 358 psi) / 250 rpm|
|Compression differential limit between cylinders||5.0 kg/m2 (490 kPa, 71 psi) / 250 rpm|
|Recommended engine oil||Semi Synthetic 10W-30 or 10W-40 (“CD” or higher: “CH”, “CI”)|
|Engine oil capacity||
Dry fill: 10.0 L (10.6 US qt, 8.8 Imp. qt)
With oil filter change: 9.7 L (10.3 US qt, 8.5 Imp. qt)
Without oil filter change: 8.4 L (8.9 US qt, 7.4 Imp. qt)
Europe: 1.52-1.58 mm (0.0598-0.0622 in.)
Australia: 1.37-1.43 mm (0.0539-0.0563 in.)
M/T: 700 ± 50 rpm
A/T: 800 ± 50 rpm
|Max engine speed under no load||4400 ± 100 rpm|
|Toyota Land Cruiser (HDJ80)||1995-1999|
|Toyota Coaster (HDB50)||1995-1999|
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