The Toyota R series of gasoline straight-four engines is where all four cylinders are mounted in a straight line along the crankcase. The 22RE engine, first introduced in the summer of 1982, was the first fuel injected engine in the series. The ‘E’ denotes fuel injection. A 2.4 liter engine, it is well-known for its reliability.
In the United States and Canada, the 22RE was installed in the Toyota pickup from 1984 through 1995. The Toyota 4Runner also had this engine from 1985 through 1995. The engine was also used in Toyota Hilux, Celica, Corona and the Volkswagen Taro.
One major difference introduced in the 22R series, including the 22RE, is that the dual-row timing chain was changed to a single-row timing chain. In 1985, major changes were introduced.
Toyota 22RE Changes and Performance Specs
- Launched with a max power rating of 105 horsepower at 4800 RPM.
- Launched with a peak torque of 137 lb-ft at 2800 RPM.
- In 1985, the max horsepower increased to 114 at the same engine speed.
- In 1985, the peak torque was 140 lb-ft at 3600 RPM.
- Engine is 2.366 liters, or 144.4 cubic inches.
- Cylinder bore was measured at 3.62 inches with a stroke of 3.5 inches.
Toyota 22RE Head & Block
- Original 22RE was a cast iron engine.
- Increased durability with use of soft piston rings, allowing the cylinder bores to avoid ridges.
Toyota 22RE Valvetrain
- Conventional push rod setup
- Camshaft in the block
- Made with 1 intake and 1 exhaust valve per cylinder, for a total of 8 valves.
Issues with the Toyota 22RE
Every 80,000 to 140,000 miles, the chain sometimes stretches. Then, the hydraulic-operated chain tensioner can’t take up further slack, causing the timing chain to bang against the solid-plastic chain guide. Driving with the broken side chain guide, without repairing it, will help a noticeable sound develop in the front of the engine, especially when cold.
Without any repairs, the chain will stretch quickly, causing faulty ignition timing and rough running. If the chain skips a tooth on the drive sprocket or breaks completely, resulting in valve and piston collisions, it will damage the engine. The stretched chain will impact against the timing cover because of the broken guide, wear through the cover and into the coolant passage behind the water pump. Coolant will then leak into the oil pan.
Toyota 22RE Engine Mods
Making mods to the 22RE helps boost horsepower and improve performance. Some mods are:
- Installing a less restrictive air cleaner
- Installing a header
- Re-routing the stock air inlet tube
- Relocating the fuel and oil filter
The engine was no longer produced as of 1997. Some of these engines are still on the road. It’s still a bestselling engine and there are numerous Toyota 22REs for sale. There are reports on the web of the 22RE with upwards of 341,000 to 500,000+ miles. Even with the upper limit of 114 horsepower, the durability has built a reputation for quality for Toyota that still exists today.
28 May 2015