The 4.0-liter V6 Ford 99X or 4.0 OHV engine was produced in Germany from 1990 to 2000 and was installed in the first two generations of the Explorer SUV, popular in a number of markets. A similar engine, but under a different designation, was installed on the Aerostar minibus and Ranger pickup truck.
Cologne V6 family: BRF, 99E, 99X.
Specifications
| Production years | 1990 – 2000 |
| Displacement, cc | 3958 |
| Fuel system | distributed injection |
| Power output, hp | 155 – 165 |
| Torque output, Nm | 298 – 314 |
| Cylinder block | cast iron V6 |
| Block head | aluminum 12v |
| Cylinder bore, mm | 100 |
| Piston stroke, mm | 84 |
| Compression ratio | 9.0 |
| Features | OHV |
| Hydraulic lifters | yes |
| Timing drive | chain |
| Phase regulator | no |
| Turbocharging | no |
| Recommended engine oil | 5W-30 |
| Engine oil capacity, liter | 4.7 |
| Fuel type | petrol |
| Euro standards | EURO 1/2 |
| Fuel consumption, L/100 km (for Ford Explorer 1993) — city — highway — combined |
17.7 11.6 13.8 |
| Engine lifespan, km | ~400 000 |
| Weight, kg | 203 |
The engine was installed on:
- Ford Explorer 1 (UN46) in 1990 – 1994; Explorer 2 (U105) in 1994 – 2000.
Disadvantages of the Ford 99X engine
- This is a fairly reliable and resourceful power unit and all its problems are due to old age.
- Most complaints are related to lubricant leaks on gaskets and seals.
- At high mileage, severe wear of the valve guides is often encountered.
- Hydraulic compensators do not tolerate cheap oil and can begin to knock after 200 thousand km.
- The short timing chain between the crankshaft and camshaft is stretched after 300,000 km.
