Toyota 1KZ-T

Toyota 1KZ-TThe Toyota 1KZ-T is a 3.0 l (2,982 cc, 181.97 cu-in) four cylinders, four-stroke cycle water-cooled turbocharged internal combustion diesel engine, manufactured by the Toyota Motor Corporation.

The 1KZ-T engine has a cast-iron block with 96.0 mm (3.78 in) cylinder bores and a 103.0 mm (4.06 in) piston stroke for a capacity of 3.0 l. Compression ratio rating is 21.2:1. The engine has an aluminum alloy cylinder head with single overhead camshaft (SOHC), mechanical indirect fuel injection system and Toyota CT12B turbocharger.

The Toyota first version of 1KZ-T produced 126 PS (93 kW; 125 HP) at 3,600 rpm of horsepower and 287 Nm (29.3 kg·m; 211.8 ft·lb) at 2,000 rpm of torque.

The breakdown of the engine code is as follows:

  • 1 – 1nd generation engine
  • KZ – Engine family
  • T – Turbocharged

General information

Engine Specifications
Engine code1KZ-T
LayoutStraight-4, vertical
Fuel typeDiesel
Production
Displacement3.0 L, 2,982 cm 3 (181.97 cu in)
Injection pumpMechanical
Power adderToyota CT12B
Horsepower net126 PS (93 KW; 125 HP) at 3,600 rpm
Torque output287 Nm (29.3 kg·m; 211.8 ft·lb) at 2,000 rpm
Firing (enjection) order1-3-4-2
Dimensions (L x H x W):
Weight

Cylinder block

The cylinder block has a monoblock high-strength cast-iron structure with the five-bearing-support system. The cylinder bores were plateau honed for more efficient piston ring sealing. The 1KZ-T engine is equipped with a fully balanced steel crankshaft that has five main journals and operated on aluminum alloy bearings.

The connecting rods are made from lightweight carbon steel and each rod has an internal oil passage which supplied an oil gallery in the piston. The pistons are made from aluminum alloy. Each piston is fitted with two compression and one oil control rings. The cylinder bore is 96.0 mm (3.78 in), piston stroke is 103.0 mm (4.06 in) and compression ratio rating is 21.2:1.

Cylinder block
Cylinder block alloyCast iron
Compression ratio:21.2:1
Cylinder bore:96.0 mm (3.78 in)
Piston stroke:103.0 mm (4.06 in)
Number of piston rings (compression / oil):2 / 1
Number of main bearings:5
Cylinder bore inner diameter:96.000-96.010 mm (3.7795-3.7799 in)
Piston skirt diameter95.940-95.950 mm (3.7772-3.7776 in)
Piston ring groove:First0.060-0.110 mm (0.0024-0.0043 in)
Second0.060-0.100 mm (0.0024-0.0039 in)
Oil0.020-0.060 mm (0.0009-0.0024 in)
Piston ring end gap:First0.350-0.570 mm (0.0138-0.0224 in)
Second0.400-0.600 mm (0.0157-0.0236 in)
Oil0.200-0.500 mm (0.0079-0.0197 in)
Piston pin outer diameter34.000-34.012 mm (1.3386-1.3391 in)
Piston pin bore diameter34.012-34.024 mm (1.3391-1.3395 in)
Crankshaft main journal diameter:69.994-70.000 mm (2.7557-2.7559 in)
Crankpin diameter:58.994-59.000 mm (2.3226-2.3228 in)

Main bearing cap tightening procedure and torque specs:

  • Step 1: 49 Nm; 5.0 kg·m; 36 ft·lb
  • Step 2: Turn all bolts 90°

After securing bearing cap bolts, make sure crankshaft turns smoothly by hand.

Connecting rod cap

  • Step 1: 29 Nm; 3.0 kg·m; 22 ft·lb
  • Step 2: Turn all bolts 90°

Crankshaft pulley bolt

  • 363 Nm; 37.0 kg·m; 268 ft·lb

Flywheel (M/T) or Drive plate (A/T) fixing bolts

  • 145 Nm; 14.8 kg·m; 107 ft·lb

Cylinder head

The 1KZ-T has an aluminum alloy cylinder head with a cross-flow configuration which is mounted on a steel laminate type head gasket and had plastic region tightening bolts. The engine has single overhead (SOHC) high-quality steel camshaft and two valves per cylinder: one intake and one exhaust (8 valves in total). The camshaft is driven by a timing belt and gears.

Intake valves are 42.5 mm (1.6732 in) in diameter, and the exhaust valves are 37.0 mm (1.4567 in). The Toyota 1KZ-T engine does not have hydraulic lifters, so special shims are used to adjust the valve clearance. Shims are available in 17 sizes from 2.50 mm (0.0984 in) to 3.30 mm (0.1299 in), in steps of 0.05 mm (0.0020 in).

Cylinder head
Cylinder head alloyAluminium
Valve Arrangement:SOHC
Valves:4 (2 valves per cylinder)
Intake valves diameter:42.5 mm (1.6732 in)
Exhaust valves diameter:37.0 mm (1.4567 in)
Intake valves length:103.29-103.69 mm (4.0665-4.0822 in)
Exhaust valves length:103.29-103.69 mm (4.0665-4.0822 in)
Intake valve stem diameter:7.975-7.990 mm (0.3140-0.3146 in)
Exhaust valves stem diameter:7.960-7.975 mm (0.3134-0.3140 in.l
Camshaft journal diameter:27.969-27.985 mm (1.1011-1.1018 in)
Intake cam lobe height:54.810-54.910 mm (2.1579-2.1618 in)
Exhaust cam lobe height:56.140-56.240 mm (2.2102-2.2142 in)

Head tightening procedure and torque specs:

  • Step 1: 39 Nm; 4.0 kg·m; 29 ft·lb
  • Step 2: Turn all bolts 90°
  • Step 3: Turn all bolts 90°

Camshaft bearing cap

  • 18 Nm; 1.85 kg·m; 13 ft·lb

Maintenance data

Valve clearance (Cold)
Intake valve0.20-0.30 mm (0.008-0.012 in)
Exhaust valve0.25-0.35 mm (0.010-0.014 in)
Compression pressure
Standard31.0 kg/m2 (3,040 kPa, 441 psi)
Minimun20.0 kg/m2 (1,961 kPa, 284 psi)
Compression differential limit between cylinders5.0 kg/m2 (490 kPa, 71 psi)
Oil system
Recommended engine oil10W-30 or 10W-40 (“CF”, “CE”, “CD”)
Engine oil capacity Dry fill: 7.5 L (7.9 US qt, 6.6 Imp. qt)
With oil filter change: 7.0 L (7.4 US qt, 6.2 Imp. qt)
Without oil filter change: 6.4 L (6.8 US qt, 5.6 Imp. qt)
Oil pressure Idle speed: 0.3 kgf/cm2 (29 kPa, 4.3 psi)
At 3,000 rpm: 2.5 kgf/cm2 (245 kPa, 33 psi)

Vehicle applications

ModelYears Produced
Toyota Land Cruiser Prado (KZJ71W, KZJ78W)
Toyota 4Runner (KZN130L)
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3 Comments

  1. I have a toyota prado with automatic transmission. I’d like to inquire what other 4 cylinder toyota engine can be used to replace my old 1KZ-TE engine. I want to replace the engine and the transmission with a stick (manual).

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