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 code 22R
Layout Four stroke, Inline-4 (Straight-4)
Fuel type Gasoline (petrol)
Production 1981-1995
Displacement 2.4 L, 2,366 cm3 (144.38 cu-in)
Fuel system Carburetor
Power adder None
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 order 1-3-4-2
Dimensions (L x W x H):

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 alloy Cast-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: Top 0.250-0.470 mm (0.0098-0.0185 in)
Second 0.600-0.820 mm (0.0236-0.0323 in)
Oil 0.200-0.570 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: INTAKE 45.0 mm (1.7717 in)
EXHAUST 37.0 mm (1.4567 in)
Valve length: INTAKE 113.5 mm (4.4685 in)
EXHAUST 112.4 mm (4.4252 in)
Valve stem diameter: INTAKE 7.970-7.985 mm (0.3138-0.3144 in)
EXHAUST 7.965-7.980 mm (0.3136-0.3142 in)
Valve spring free length: 48.5 mm (1.9094 in)
Camshaft cam height: INTAKE 42.63-42.72 mm (1.6783-1.6819 in)
EXHAUST 42.69-42.78 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 valve 0.20 mm (0.008 in)
Exhaust valve 0.30 mm (0.012 in)
Compression pressure
Standard 12.0 kg/cm2 / 200 rpm
Minimun 10.0 kg/cm2 / 200 rpm
Compression differential limit between cylinders 1.0 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 oil 5W-30, 10W-30
Oil type API SF 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 plug NGK: BPR5EY
Spark plug gap 0.8 mm (0.0315 in)

Vehicle applications

Model Years Produced
Toyota Corona 1981
Toyota Hilux 1981-1997
Toyota Celica 1981-1984
Toyota Cressida 1991
Toyota Pickup 1981-1995
Toyota 4Runner 1984
Toyota Land Cruiser 1984-1989
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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We try to use verified sources and official documentation, however, differences between sources or errors in entering information may occur. We do not provide advice on technical issues related to the engines operation or repair. We do not recommend using provided information for engines repairing engines or spare parts ordering, use only official service manuals and spare-parts catalogs.


  1. I would just like to know if there is a difference between the carburetor on a 21r and the carburetor on a 22r

  2. I just picked up a sweet rebuilt 22re engine from Kinda rad old hippy dude but you can tell he knows his stuff and it was the best price I could find anywhere, even with shipping…!

  3. I had a 22R (carbureted). Put 360k on it before the head gasket blew. Replaced the engine with a very low miles engine. Ran great. 10,000 miles into the replacement engine, the truck was rear ended and totaled.

    Great truck. Wish I still had it.

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