Toyota 1JZ-GE

Toyota 1JZ-GEThe Toyota 1JZ-GE is a 2.5 liter (2,492 cc, 152.07 cu-in) straight-six, four-stroke cycle natural aspirated gasoline engine from the Toyota JZ-family. The engine was manufactured by the Toyota Motor Corporation on the Tahara Plant (Tahara, Aichi, Japan) from 1990 to 2007.

The Toyota 1JZ-GE engine features a cast-iron block, aluminum cylinder head with dual belt-driven overhead camshafts and four valves per cylinder (24 in total). The 1JZ-GE is equipped with an electronic fuel injection system, VVT-i (Variable Valve Timing with intelligence) since 1996, ACIS variable-length intake manifold. Bore and stroke are 86.0 mm (3.39 in) and 71.5 mm (2.81 in), respectively.

The first generation of the Toyota 1JZ-GE had a compression ratio rating of 10.5:1, ignition system with a mechanical distributor and was manufactured from 1990 to 1995. This version produced 170 PS (125 kW; 168 HP) at 6,000 rpm of maximum horsepower and 235 Nm (24.0 kg·m; 173.4 ft·lb) at 4,800 rpm of peak torque. Redline is 7,500 rpm.

The second generation had a compression ratio of 10.5:1 , VVT-i system on the inlet camshaft and DIS-3 ignition system with 3 ignition coils. This engine produced 200 PS (147 kW; 197 HP) at 6,000 rpm of horsepower and 251 Nm (25.6 kg·m; 185.24 ft·lb) at 4,000 rpm of maximum torque. Redline is 7,000 rpm.

The breakdown of the engine code is as follows:

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

General information

Engine Specifications
Engine code1JZ-GE
LayoutFour stroke, Inline-6 (Straight-6)
Fuel typeGasoline
Production1990-2007
Displacement2.5 L, 2,492 cm3 (152.07 cu in)
Fuel systemMulti-point fuel injection system
Power adderNone
Max. horsepower 1990-1996:
170 PS (125 kW; 168 HP) at 6,000 rpm
1996-2000:
200 PS (147 kW; 197 HP) at 6,000 rpm
Max. torque 1990-1996:
235 Nm (24.0 kg·m; 173.4 ft·lb) at 4,800 rpm
1996-2000:
251 Nm (25.6 kg·m; 185.24 ft·lb) at 4,000 rpm
Firing order1-5-3-6-2-4
Dimensions (L x H x W):
Weight

Cylinder block

The Toyota 1JZ-GE engine has a cast-iron cylinder block, bore is 86.0 mm (3.39 in) and stroke is 71.5 mm (2.81 in). The cylinder block, a monoblock specially cast structure, employs the seven bearing support system. The crankshaft has seven journals and twelve counterweights; both pins and journals were induction-hardened.

The pistons are special aluminum casting. Each piston is fitted with two compression rings and a single oil ring. Compression ratio rating for 1JZ-GE without VVT-i system is 10.0:1, for the version with VVT-i, is 10.5:1.

Cylinder block
Cylinder block alloyCast-iron
Compression ratio: 1990-1995 (Without VVTi): 10.5:1
1996-2000 (With VVTi): 10.0:1
Cylinder bore:86.0 mm (3.39 in)
Piston stroke:71.5 mm (2.81 in)
Number of piston rings (compression / oil):2 / 1
Number of main bearings:7
Cylinder inner diameter (standard):86.000-86.013 mm (3.3858-3.3863 in)
Piston skirt diameter (standard):85.935-85.945 mm (3.3832-3.3836 in)
Piston pin outer diameter:21.997-22.006 mm (0.8660-0.8664 in)
Piston ring side clearance:Top0.011-0.070 mm (0.0004-0.0027 in)
Second0.030-0.070 mm (0.0012-0.0028 in)
Piston ring end gap:Top0.30-0.40 mm (0.0118-0.0157 in)
Second0.35-0.45 mm (0.0137-0.0177 in)
Oil0.13-0.38 mm (0.0051-0.0150 in)
Crankshaft main journal diameter:62.000 mm (2.4410 in)
Crankpin diameter:52.000 mm (2.0472 in)
Crankshaft center distance:35.75 mm (1.4074 in)

Main bearing cap bolts torque specs:

  • Step 1: 44 Nm; 4.5 kg·m; 32.5 ft·lb
  • Step 2: Turn all bolts 90°

Connecting rods cap bolts torque specs:

  • Step 1: 29 Nm (3.0 kg·m; 21.4 ft·lb)
  • Step 2: Turn all bolts 90°

Flywheel bolt torque specs:

  • Step 1: 49 Nm (5 kg·m; 36.16 ft·lb)
  • Step 2: Turn all bolts 90°

Drive plate fixing bolts: 83 Nm (8.5 kg·m; 61.3 ft·lb)

Cylinder head

The cylinder head is made of a light, strong aluminum alloy with good cooling efficiency. Camshafts are made of specially cast steel and are driven by timing belt. The 1JZ-GE has the intake valves with a head diameter of 33.6 mm (1.3228 in) and the exhaust valves with a head diameter of 29.0 mm (1.1417 in).

The Toyota 1JZ engines are not equipped with hydraulic lifters, so special valve shims are used to adjust the valve clearance.

Cylinder head alloy:AluminumValve Arrangement:DOHC, belt driveValves:24 (4 valves per cylinder)Intake duration:–Exhaust duration:–Valve head diameter:INTAKE33.6 mm (1.3228 in)EXHAUST29.0 mm (1.1417 in)Valve length:INTAKE98.29-98.79 (3.8697-3.8894 in)EXHAUST98.84-99.34 mm (3.8913-3.9110 in)Valve stem diameter:INTAKE5.970-5.985 mm (0.2350-0.2356 in)EXHAUST5.965-5.980 mm (0.2348-0.2354 in)Valve spring free length:41.50 mm (1.6338 in) or 41.74 mm (1.6433 in)Camshaft lobe height:INTAKE44.200-44.300 mm (1.7400-1.7440 in)EXHAUST44.250-44.350 mm (1.7420-1.7460 in)

Cylinder head torque specs:

  • Step 1: 35 Nm; 3.6 kg·m; 25.83 ft·lb
  • Step 2: Turn all bolts 90°
  • Step 2: Turn all bolts another 90°

Maintenance data

Valve clearance
Intake valve0.15-0.25 mm (0.006-0.010 in)
Exhaust valve0.25-0.35 mm (0.010-0.014 in)
Compression pressure
Standard12.5-13.5 kg/cm2 / 350 rpm
Minimun10.0-11.0 kg/cm2 / 250 rpm
Oil system
Oil consumption , L/1000 km (qt. per miles)up to 0.5 (1 qt. per 1200 miles)
Recommended engine oil 5W-30
5W-40
10W-30
Oil type APISG or SJ
Engine oil capacity (Refill capacity) 2WD
Without oil filter: 5.1-5.4 l
With oil filter: 5.4-5.7 l

4WD
Without oil filter: 4.2-4.5 l
With oil filter: 4.5-4.8 l

Oil change interval, km (miles)10,000 (6,000)
Ignition system
Spark plug 1991-1997
DENSO: PK16R11; NGK: BKR5EP11

1996-2000 (VVTi)
DENSO: PK16TR11; NGK: BKR5EKPB11

After 2000 (VVTi)
DENSO: SK16R-P11;

Spark plug gap1.0-1.1 mm (0.039-0.043 in)

Valve clearance adjustment data

Calculate the thickness of 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

Intake:
N = R + [M – 0.20 mm (0.008 in)]
Exhaust:
N = R + [M – 0.30 mm (0.012 in)]

Valve lifters are available in 17 sizes range from 2.50 mm (0.0984 in) to 3.30 mm (0.1181 in), in steps of 0.05 mm (0.0020 in).

Example (intake valve):
R = 2.90 mm
M = 0.40 mm
N = 2.90 + (0.40 – 0.20) = 3.10 mm, so we need a valve shim with thickness of 3.10 mm (0.1220 in).

Vehicle applications

ModelYears Produced
Toyota Марк II
Toyota Soarer
Toyota Chaser
Toyota Cresta
Toyota Progres
Toyota Crown
Toyota Crown Estate
Toyota Mark II Blit
Toyota Verossa
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5 Comments

  1. THANKS FOR YOUR INFO AND SPEC FOR TOYOTA 1JZ ENGINE TRIED TO FIND SPEC ON FORUMS WHAT A LOT OF IDIOTS I PITY THE THE ENGINES THEY BUILD EVERYONE IS CONTRADICTING EACH OTHER AND END OF IT YOUSTILL DONT FIND WHAT YOUR AFTER THANKER SW

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