The Jeep ERH or AMC 242 4.0-liter gasoline engine was produced from 1986 to 2006 and was installed in almost all brand SUVs, such as the Wrangler, Cherokee and Grand Cherokee. Until 1991, the engine was produced with the RENIX injection system, and then switched to its own from Mopar.
The AMC series also includes internal combustion engines: EPE.
The engine was installed on:
- Jeep Cherokee 2 (XJ) in 1987 – 2001;
- Jeep Comanche 1 (MJ) in 1987 – 1992;
- Jeep Grand Cherokee 1 (ZJ) in 1992 – 1998;
- Jeep Grand Cherokee 2 (WJ) in 1998 – 2004;
- Jeep Wrangler 1 (YJ) in 1991 – 1995;
- Jeep Wrangler 2 (TJ) in 1996 – 2006.
Specifications
| Production years | 1986-2006 |
| Displacement, cc | 3964 |
| Fuel system | injector |
| Power output, hp | 175 – 195 |
| Torque output, Nm | 300 – 320 |
| Cylinder block | cast iron R6 |
| Block head | cast iron 12v |
| Cylinder bore, mm | 98.4 |
| Piston stroke, mm | 86.7 |
| Compression ratio | 8.6 – 8.7 |
| Features | OHV |
| Hydraulic lifters | yes |
| Timing drive | chain |
| Phase regulator | no |
| Turbocharging | no |
| Recommended engine oil | 5W-30 |
| Engine oil capacity, liter | 5.7 |
| Fuel type | petrol |
| Euro standards | EURO 2/3 |
| Fuel consumption, L/100 km (for Jeep Grand Cherokee 2000) — city — highway — combined |
19.0 11.5 15.2 |
| Engine lifespan, km | ~450 000 |
Disadvantages of the ERH engine
- The engine has high reliability and resource, but fuel consumption is high;
- From 1999 to 2001 there was a cylinder head marriage, they cracked in the region of the 3rd or 4th cylinders;
- Many have encountered exhaust manifold cracks due to a sagging support;
- On long runs, the crankshaft rear oil seal often leaks, and its replacement is not cheap;
- The weak points of this motor also include the fuel pump and the electric fan relay.
