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Toyota 1HD-FT Engine Specifications
The Toyota 1HD-FT is a 4.20 l (4,164 cc, 254.1 cubic inches) six
cylinders 4-stroke 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 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 cubic inches). 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 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 kgm;
280.44 ft-lb) at 2,500 rpm of torque.
Engine code identification:
1 - 1nd generation engine
HD - Engine family
F - Economy narrow-angle DOHC
T - Turbocharged
| GENERAL TECHNICAL DATA |
Engine model ............... 1HD-FT
Cylinder layout ............... Straight-6, vertical
Fuel type ............... Diesel
Production ............... No data available
Total displacement ............... 4.2L, 4,164 cc (254.1 cubic inches)
Injection pump ............... Mechanical
Power adder ............... Toyota CT26
Rated power ............... 170 PS (125 KW; 167 HP) at 3,600 rpm
Torque output ............... 380 Nm (38.76 kgm; 280.44 ft-lb) at 2,500
rpm
Firing order ............... 1-4-2-6-3-5
Dimensions (L x H x W) ............... No data available
Weight ...............
| CYLINDER BLOCK |
The cylinder block has a monoblock high-strength cast-iron structure
with the seven-bearing-support system. The 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
Compression ratio ............... 18.6:1
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 kgm; 76 ft-lb
Step 2: Turn all bolts 90deg
6 pointed head:
18 Nm; 1.8 kgm; 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 kgm; 27 ft-lb
Step 2: Turn all bolts 90deg
Crankshaft pulley bolt
430 Nm; 44.0 kgm; 317 ft-lb
Flywheel (M/T) or Drive plate (A/T) fixing bolts
127 Nm; 13.0 kgm; 94 ft-lb
| CYLINDER HEAD |
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 224deg and exhaust
duration is 246deg.
The 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
Valve Arrangement ............... OHV
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 kgm; 51 ft-lb
Step 2: Turn all bolts 90deg
Step 3: Turn all bolts 90deg
Camshaft bearing cap
25 Nm; 2.5 kgm; 18 ft-lb
| MAINTENANCE DATA |
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)
Compression pressure
Standard ............... 35.0 kg/m2 (3,432 kPa, 498 psi) / 250 rpm
Minimum ............... 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
Oil system
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)
Fuel system
Plunger stroke ............... Europe: 1.52-1.58 mm (0.0598-0.0622 in.)
Australia: 1.37-1.43 mm (0.0539-0.0563 in.)
Idling ............... M/T: 700 ± 50 rpm
A/T: 800 ± 50 rpm
Max engine speed under no load ............... 4400 ± 100 rpm
| VEHICLE APPLICATIONS |
Model ............... Years Produced
Toyota Land Cruiser (HDJ80) ............... 1995-1999
Toyota Coaster (HDB50) ............... 1995-1999
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