Toyota 1G-GE

Toyota 1G-GEThe Toyota 1G-GE is a 2.0 L (1,988 cc, 121.3 cu·in) straight-six, four-stroke cycle natural aspirated gasoline engine from the Toyota G-family. The engine was manufactured by Toyota Motor Corporation from 1988 to 1993.

The Toyota 1G-GE engine features a cast-iron cylinder block, aluminum cylinder head with dual belt-driven overhead camshafts (DOHC) and four valves per cylinder (24 in total). The 1G-GE is equipped with an electronic fuel injection system. Cylinder bore and piston stroke are 75.0 mm (2.95 in) and 75.0 mm (2.95 in), respectively. The Compression ratio rating is 9.5:1.

This engine produced 140 PS (103 KW; 138 HP) at 6,000 rpm or 150 PS (110 KW; 147 HP) at 6,000 rpm of maximum horsepower and from 173 Nm (17.6 kg·m; 127.7 ft·lb) at 4,000 rpm to 182 Nm (18.6 kg·m; 134.3 ft·lb) at 5,600 rpm of peak torque.

The breakdown of the engine code is as follows:

  • 1 – 1 generation engine
  • G – Engine family
  • G – Performance wide-angle DOHC
  • E – Multi-Point Fuel Injection

General information

Engine Specifications
Engine code1G-GE
LayoutFour stroke, Inline-6 (Straight-6)
Fuel typeGasoline
Displacement2.0 L, 1,988 cm3 (121.3 cu in)
Fuel systemMulti-point fuel injection system
Power adderNone
Max. horsepower 140 PS (103 KW; 138 HP) at 6,000 rpm
150 PS (110 KW; 147 HP) at 6,000 rpm
Max. torque 173 Nm (17.6 kg·m; 127.7 ft·lb) at 4,000 rpm
181 Nm (18.5 kg·m; 133.6 ft·lb) at 5,600 rpm
182 Nm (18.6 kg·m; 134.3 ft·lb) at 5,600 rpm
Firing order1-5-3-6-2-4
Dimensions (L x H x W):
Weight190 kg (419 lbs)

Cylinder block

The Toyota 1G-GE engine has a cast-iron cylinder block, bore is 75.0 mm (2.95 in) and the piston stroke is 75.0 mm (2.95 in). The cylinder block, a monoblock specially cast structure, employs the seven bearing support system. The crankshaft has seven journals.

The pistons are aluminum casting. Each piston is fitted with two compression rings and a single oil ring. The compression ratio rating is 9.5:1.

Cylinder block
Cylinder block alloyCast-iron
Compression ratio:9.5:1
Cylinder bore:75.0 mm (2.95 in)
Piston stroke:75.0 mm (2.95 in)
Number of piston rings (compression / oil):2 / 1
Number of main bearings:7
Cylinder inner diameter (standard): №1,6: 74.990-75.020 mm (2.9524-2.9535 in)
№2,3,4,5: 75.000-75.030 mm (2.9528-2.9539 in)
Piston skirt diameter (standard):74.960-74.990 mm (2.9512-2.9523 in)
Piston pin outer diameter:17.999-18.011 mm (0.7086-0.7090 in)
Piston ring side clearance:Top0.040-0.080 mm (0.0016-0.0031 in)
Second0.030-0.070 mm (0.0012-0.0028 in)
Piston ring end gap:Top0.250-0.490 mm (0.0098-0.0192 in)
Second0.200-0.270 mm (0.0079-0.0106 in)
Oil0.200-0.820 mm (0.0079-0.0323 in)
Crankshaft main journal diameter:54.955-55.000 mm (2.1636-2.1653 in)
Crankpin diameter:41.985-42.000 mm (1.6529-1.6535 in)

Main bearing cap bolts torque specs:

  • 60 Nm; 6.1 kg·m; 44.3 ft·lb

Connecting rods cap bolts torque specs:

  • 50 Nm 5.1 kg·m; 36.9 ft·lb

Cylinder head

The cylinder head is made of a light, strong aluminum alloy with good cooling efficiency. The 1G-GE engine has double camshafts (DOHC) and four valves per cylinder (24 valves in total). The 1G-GE motor does not have hydraulic lifters, so special valve lifters are used to adjust the valve clearance.

Cylinder head alloy:Aluminum
Valve Arrangement:DOHC, belt drive
Valves:24 (4 valves per cylinder)
Intake duration:
Exhaust duration:
Valve head diameter:INTAKE
Valve length:INTAKE94.20 mm (3.7086 in)
EXHAUST94.25 mm (3.7106 in)
Valve stem diameter:INTAKE5.960-5.975 mm (0.2346-0.2352 in)
EXHAUST5.955-5.970 mm (0.2344-0.2350 in)
Valve spring free length:43.85 mm (1.7264 in)
Camshaft lobe height:INTAKE35.510-35.610 mm (1.3980-1.4019 in)
EXHAUST35.510-35.610 mm (1.3980-1.4019 in)

Cylinder head torque specs:

  • 64 Nm; 6.5 kg·m; 47.2 ft·lb

Maintenance data

Valve clearance (Cold)
Intake valve (COLD)0.15-0.25 mm (0.006-0.0100 in)
Exhaust valve (COLD)0.20-0.30 mm (0.0078-0.0118 in)
Compression pressure
Standard 13.0 kg/cm2 / 300 rpm
Minimun10.0 kg/cm2 / 300 rpm
Oil system
Oil consumption , L/1000 km (qt. per miles)up to 0.5 (1 qt. per 1200 miles)
Recommended engine oil10W-30
Oil type APISG or better
Engine oil capacity (Refill capacity)3.9 l (4.1 US qts, 3.4 Imp qts)
Oil change interval, km (miles)10,000 (6,000)
Ignition system
Spark plugDENSO PQ20R, NGK BCPR6EP-11
Spark plug gap1.0-1.1 mm (0.039-0.043 in)
Spark plug torque18 N·m (1.8 kg·m, 13.3 ft·lb)

Valve clearance adjustment data
Calculate the thickness of the new adjusting valve lifter so valve clearance comes within specified values.

R = Thickness of removed valve lifter
N = Thickness of new valve lifter
M = Measured valve clearance

N = R + [M – 0.20 mm (0.008 in)]
N = R + [M – 0.25 mm (0.010 in)]

For 1G-GE engine valve lifters are available in 27 sizes to range from 2.00 mm (0.0787 in) to 3.30 mm (0.1299 in), in steps of 0.05 mm (0.0019 in).

Vehicle applications

ModelYears Produced
Toyota Chaser (X80)1988-1992
Toyota Cresta (X80)1988-1992
Toyota Crown (S130)1988-1991
Toyota Mark II (X80)1988-1992
Toyota Soarer (Z20)1988-1991
Toyota Supra (A70)1988-1993
Author: Sergei Wers
About: Co-founder and CEO of a multi-brand auto repair shop (engine repair, chassis repair, body repair and painting) for over 15 years. I have been developing internet sites with technical specifications for more than seven years.

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