Toyota 1HZ Engine Specifications
Toyota 1HZ is a 4.20 l (4,164 cc, 254.1 cubic inches) six
cylinders, four-stroke cycle water-cooled naturally aspirated internal
combustion diesel engine, manufactured by the Toyota Motor Corporation.
The 1HZ engine has a cast-iron cylinder block with 94.0 mm (3.7 in)
cylinder bores and a 100.0 mm (3.94 in) piston stroke. Compression ratio
rating was 22.7:1. In 1998, this engine received a reinforced
cylinder block and crankshaft, new pistons and glow plugs, the
compression was reduced to 22.4:1. Since 2002 the engine is equipped
with an EGR system.
The motor has a cast iron cylinder head with the single overhead
camshaft (SOHC) with two valves per cylinder and indirect injection
design.
The Toyota 1HZ produced 131 PS (96 kW; 129 HP) at 3,800 rpm or 135 PS
(99 kW; 133 HP) at 4,000 rpm of maximum horsepower and 279 Nm (28.5 kgm;
205.9 ft-lb) at 2,200 rpm or 284 Nm (29.0 kgm; 209.6 ft-lb) at 2,200 rpm
of maximun torque.
The breakdown of the engine code is as follows:
1 – 1st generation engine
HZ – Engine family
Engine model ...................... 1HZ
Cylinder layout ...................... Straight-6, vertical
Fuel type ...................... Diesel
Year of production ...................... No data available
Total displacement ...................... 4.2L, 4,164 cc (254.1 cu in)
Injection pump ...................... Mechanical
Power adder ...................... None
Horsepower net ...................... 131 PS (96 KW; 129 HP) at 3,800
rpm
135 PS (99 KW; 133 HP) at 4,000 rpm
Maximum torque ...................... 279 Nm (28.5 kgm; 205.9 ft-lb) at
2,200 rpm
284 Nm (29.0 kgm; 209.6 ft-lb) at 2,200 rpm
Firing order ...................... 1-4-2-6-3-5
Dimensions (L x H x W) ...................... No data available
Weight ......................
The cylinder block is made of cast iron. The crankshaft is supported by
7 bearings on the inside of the crankcase. The crankshaft bearings are
made of aluminum alloy. The crankshaft is integrated with 12 balance
weights which are cast along with it for balance. Oil holes are built
into the crankshaft for supplying oil to the connecting rods, bearings
and etc. The crankshaft bearing cap is of ladder-frame construction and
is incorporated into the crankcase.
Pistons are made of highly temperature-resistant aluminum alloy. The
first compression ring is made of steel and the second compression ring
is made of cast iron. The oil ring is made of steel.
The cylinder bore is 94 mm (3.7 in), piston stroke is 100 mm (3.94 in)
and compression ratio rating is 22.7:1 or 22.4:1 (after 1998).
Cylinder block alloy ...................... Cast iron
Compression ratio ...................... 22.7:1 or 22.4:1
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 ...................... 94.000-94.030 mm
(3.7001-3.7019 in)
Piston skirt diameter ...................... 93.885-94.895 mm
(3.6962-3.6966 in)
93.950-93.960 mm (3.6988-3.6992 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 ......................
0.270-0.540 mm (0.0106-0.0212 in)
Second ...................... 0.400-0.620 mm (0.0157-0.0244 in)
Oil ...................... 0.200-0.520 mm (0.0079 – 0.0204 in)
Piston pin outer diameter ...................... 29.000-29.012 mm
(1.1417-1.1412 in)
33.000-33.012 mm (1.2992-1.2997 in)
Piston pin bore diameter ...................... 29.008-29.020 mm
(1.1420-1.1425 in)
33.008-33.020 mm (1.2995-1.3000 in)
Crankshaft main journal diameter ...................... 66.994-67.004
mm (2.6375-2.6379 in)
Crankpin diameter ...................... 58.994-59.004 mm
(2.3225-2.3230 in)
Crankshaft center distance ...................... 50.0 mm (1.9685 in)
Main bearing cap tightening procedure and torque specs:
Step 1: 103 Nm; 10.5 kgm; 76 ft-lb
Step 2: Turn all bolts 90°
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 90°
Crankshaft pulley bolt
500 Nm; 50.0 kgm; 369 ft-lb
Flywheel (M/T) or Drive plate (A/T) fixing bolts
127 Nm; 13.0 kgm; 94 ft-lb
The cylinder head is made of cast iron with a cross-flow type intake and
exhaust layout. The combustion chambers are swirl chamber type. The
camshaft journal part of the cylinder head has camshaft caps made of
aluminum alloy and is made of cast iron on the cylinder head side. The
camshaft is driven by the timing belt.
The 1HZ engine has OHV design with two valves per cylinder. Intake
valves are 42.5 mm (1.6732 in) in diameter, and the exhaust valves are
36.0 mm (1.4173 in). Exhaust and intake valves are equipped with
irregular pitch springs which are capable of following the valves even
at high engine speeds. The 1HZ engine has a dual-type exhaust manifold.
Adjustment of the valve clearance is done by means of an outer shim type
system, in which valve adjusting shims are located above the valve
lifters.
Cylinder head alloy ...................... Cast iron
Valve Arrangement ...................... SOHC
Valves ...................... 12 (2 valves per cylinder)
Intake valves diameter ...................... 42.5 mm (1.6732 in)
Exhaust valves diameter ...................... 36.0 mm (1.4173 in)
Intake valves length ...................... 103.29-103.69 mm
(4.0665-4.0822 in)
Exhaust valves length ...................... 103.14-103.54
(4.0606-4.00764 in)
Intake valve stem diameter ...................... 7.975-7.990 mm
(0.3140-0.3145 in)
Exhaust valves stem diameter ...................... 7.960-7.975 mm
(0.3133-0.3140 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)
Camshaft lobe height (intake) ...................... 55.090-55.110 mm
(2.1689-2.1697 in)
Camshaft lobe height (exhaust) ...................... 55.940-55.960 mm
(2.2024-2.2031 in)
Head tightening procedure and torque specs:
Step 1: 69 Nm; 7.0 kgm; 51 ft-lb
Step 2: Turn all bolts 90°
Step 3: Turn all bolts 90°
Camshaft bearing cap
No.1 journal: 25 Nm; 2.5 kgm; 18 ft-lb
Others: 18 Nm; 1.85 kgm; 13 ft-lb
Valve clearance (Cold)
Intake valve ...................... 0.15-0.25 mm (0.006-0.0098 in)
Exhaust valve ...................... 0.35-0.45 mm (0.0137-0.0177 in)
Compression pressure
Standard ...................... 37.0 kg/m2 (3,628 kPa, 526 psi) / 250
rpm
Minimun ...................... 27.0 kg/m2 (2,648 kPa, 384 psi) / 250 rpm
Compression differential limit between cylinders ......................
5.0 kg/m2 (490 kPa, 71 psi) / 250 rpm
Oil system
Recommended engine oil ...................... 10W-30 or 10W-40 (“CC”,
“CD” or higher: “CH”, “CI”)
Engine oil capacity ...................... Dry fill: 9.6 L (10.1 US qt,
8.4 Imp. qt)
With oil filter change: 9.3 L (9.8 US qt, 8.1 Imp. qt)
Without oil filter change: 8.0 L (8.5 US qt, 7.0 Imp. qt)
Fuel system
Plunger stroke ...................... 1.03-1.09 mm (0.0406-0.0429 in.)
Idling ...................... M/T: 650 ± 50 rpm
A/T: 700 ± 50 rpm
Model ...................... Years Produced
Toyota Land Cruiser (J75, J78, J79) ...................... No data available
Toyota Land Cruiser (HZJ77) ...................... No data available
Toyota Land Cruiser (J80) ...................... No data available
Toyota Land Cruiser (J105) ...................... No data available
Toyota Coaster (HZB30, HZB40) ...................... No data available
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