Toyota 22R

Toyota 22RThe Toyota 22R is a 2.4 L (2,366 cc, 144.38 cu·in) straight-four 4-stroke natural aspirated gasoline engine from Toyota R-family. The engine was manufactured by Toyota Motor Corporation since 1981 to 1995.

The 22R engine features a cast-iron block and aluminum cylinder head with the single overhead camshaft (SOHC) and two valves per cylinder (8 in total). Compression ratio rating is 9.0:1. Cylinder bore and piston stroke are 92.0 mm (3.62 in) and 89.0 mm (3.5 in), respectively. The Toyota 22R engine has a carburetor fuel system and ignition system with a mechanical distributor.

In 1983, Toyota swapped the dual-row timing chain used in older 22R engines for a single-row chain with plastic guides. In 1985, the 22R engine was redesigned, many parts from the newer 22R (such as cylinder head, block, pistons, the timing chain, and cover, water and oil pumps) are not compatible with those from the older pre-1985 engine.

The engine produced from 98 PS (72 kW; 97 HP) at 4,800 rpm to 110 PS (81 kW; 109 HP) at 5,000 rpm of maximum horsepower and from 174 N·m (17.7 kg·m, 128 ft·lb) at 2,800 rpm to 187 N·m (19.1 kg·m, 138 ft·lb) at 3,400 rpm of peak torque.

The breakdown of the engine code is as follows:

  • 22 – 22 generation engine
  • R – Engine family

General information

Engine Specifications
Engine code22R
LayoutFour stroke, Inline-4 (Straight-4)
Fuel typeGasoline (petrol)
Production1981-1995
Displacement2.4 L, 2,366 cm3 (144.38 cu-in)
Fuel systemCarburetor
Power adderNone
Power output From 98 PS (72 kW; 97 HP) at 4,800 rpm
to 110 PS (81 kW; 109 HP) at 5,000 rpm
Torque output From 174 N·m (17.7 kg·m, 128 ft·lb) at 2,800 rpm
to 187 N·m (19.1 kg·m, 138 ft·lb) at 3,400 rpm
Firing order1-3-4-2
Dimensions (L x W x H):
Weight

Cylinder block

The Toyota 22R has a cast-iron cylinder block with five bearing support system. It has a 92.0 mm (3.62 in) cylinder bore and 89.0 mm (3.5 in) piston stroke. Compression ratio rating is 9.0:1.

Cylinder block (86 and later)
Cylinder block alloyCast-iron
Compression ratio:9.0:1
Cylinder bore:92.0 mm (3.62 in)
Piston stroke:89.0 mm (3.5 in)
Number of piston rings (compression / oil):2 / 1
Number of main bearings:5
Cylinder inner diameter (standard):92.000-92.030 mm (3.622-3.6232 in)
Piston skirt diameter (standard):91.970-92.000 mm (3.6209-3.622 in)
Connecting rod big end diameter (standard):56.000-56.006 mm (2.2047-2.205 in)
Piston ring end gap:Top0.250-0.470 mm (0.0098-0.0185 in)
Second0.600-0.820 mm (0.0236-0.0323 in)
Oil0.200-0.570 mm (0.0079-0.0224 in)
Crankshaft main journal diameter:59.984-60.000 mm (2.3616-2.3622 in)
Crankpin diameter:52.988-53.000 mm (2.0861-2.0866 in)

Main bearing cap bolts tightening procedure and torque specs:

  • 103 Nm, 10.5 kg·m; 76 ft·lb

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

Connecting rod bearing bolts

  • 69 Nm, 7.0 kg·m; 51 ft·lb)

Cylinder head

The cylinder head is made of aluminum alloy which gives it good cooling efficiency. The engine has single overhead camshaft, that is driven by a timing chain and two valves per cylinder (8 valves in total). Intake valve head diameter is 45.0 mm (1.77 in), and exhaust valve head diameter is 37.0 mm (1.46 in). Intake valve duration is 272°, valve lift is 10.1 mm, and exhaust valve duration is 248°, valve lift is 9.7 mm.

Cylinder head (86 and later)
Valve Arrangement:SOHC, chain drive
Valves:8 (2 valves per cylinder)
Valve head diameter:INTAKE45.0 mm (1.7717 in)
EXHAUST37.0 mm (1.4567 in)
Valve length:INTAKE113.5 mm (4.4685 in)
EXHAUST112.4 mm (4.4252 in)
Valve stem diameter:INTAKE7.970-7.985 mm (0.3138-0.3144 in)
EXHAUST7.965-7.980 mm (0.3136-0.3142 in)
Valve spring free length:48.5 mm (1.9094 in)
Camshaft cam height:INTAKE42.63-42.72 mm (1.6783-1.6819 in)
EXHAUST42.69-42.78 mm (1.6807-1.6842 in)
Camshaft journal diameter:32.98-33.00 mm (1.2984-1.2992 in)

Head tightening procedure and torque specs:

  • 78 Nm, 8.0 kg·m; 58 ft·lb

Maintenance data

Valve clearance
Intake valve0.20 mm (0.008 in)
Exhaust valve0.30 mm (0.012 in)
Compression pressure
Standard12.0 kg/cm2 / 200 rpm
Minimun10.0 kg/cm2 / 200 rpm
Compression differential limit between cylinders1.0 kg/cm2 / 200 rpm
Oil system
Oil consumption , L/1000 km (qt. per miles)up to 0.5 (1 qt. per 1200 miles)
Recommended engine oil5W-30, 10W-30
Oil type APISF or SF/CC
Engine oil capacity (Refill capacity) With filter change ~ 4.2 l l
Without filter change ~ 3.8 l
Oil change interval, km (miles)10,000 (6,000)
Ignition system
Spark plugNGK: BPR5EY
DENSO: W16EXR-U
Spark plug gap0.8 mm (0.0315 in)

Vehicle applications

ModelYears Produced
Toyota Corona1981
Toyota Hilux1981-1997
Toyota Celica1981-1984
Toyota Cressida1991
Toyota Pickup1981-1995
Toyota 4Runner1984
Toyota Land Cruiser1984-1989
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