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.
Frequently asked questions about the Ford 99X
How much power does the Ford 99X make?
The Ford 99X develops 155 - 165 hp and 298 - 314 Nm of torque.
How much oil does the Ford 99X take and which one?
Engine oil capacity: 4.7 liters. Recommended oil: 5W-30.
Does the Ford 99X have a timing belt or chain?
The Ford 99X uses a timing chain.
Is the Ford 99X turbocharged?
No, the Ford 99X is naturally aspirated.
Does the Ford 99X need valve clearance adjustment?
No, the Ford 99X has hydraulic lifters, so the valve clearances do not need to be adjusted.
How long does the Ford 99X last?
The typical lifespan of the Ford 99X is ~400 000 km with proper maintenance.
What is the fuel consumption of the Ford 99X?
Ford Explorer 1993: city 17.7, highway 11.6, combined 13.8 L/100 km.
What cars was the Ford 99X installed on?
Ford Explorer 1 (UN46) in 1990 - 1994, Explorer 2 (U105) in 1994 - 2000.
What are the common problems of the Ford 99X?
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. All known problems.
What engines are related to the Ford 99X?
Cologne V6 family: Cologne V6, BRF, 99E.
