The Opel C18NZ engine is a four-cylinder, 1.8-liter engine that was produced by Opel (a subsidiary of General Motors) from 1987 to 1993. It was used in various Opel models, including the Astra, Kadett, and Vectra.
The engine features a cast iron block and aluminum cylinder head, and has a single overhead camshaft (SOHC) design with two valves per cylinder. It uses a multi-point fuel injection system and is equipped with Opel’s electronic engine management system.
In its original form, the C18NZ engine produced 75 horsepower and 94 lb-ft of torque. However, various improvements were made over the years, including changes to the cylinder head and intake system, which increased its output to 90 horsepower and 103 lb-ft of torque in its final form.
Engine specifications for Opel C18NZ 1.8 l
| Displacement | 1796 cc |
| Engine power | 90 hp |
| Torque | 145 Nm |
| Cylinder block | Cast iron R4 |
| Cylinder head | Aluminum 8v |
| Cylinder diameter | 84.8 mm |
| Stroke | 79.5 mm |
| Compression ratio | 9.2 |
| Engine features | No |
| Hydraulic compensators | Yes |
| Timing Chain/Belt | Belt |
| Variable Valve Timing (VVT) | No |
| Turbocharger | No |
| Oil capacity/Recommended oil | 4.0 l 5W-30 |
| Fuel type | Regular |
| Euro class | EURO 1 |
| Average lifespan | 330 000 km |
The catalog weight of the C18NZ engine is 130 kg
The C18NZ engine number is located on the joint between the block and the head
Oil specifications for the Opel C18NZ engine
| Oil Specification | Capacity | Type | Intervals |
|---|---|---|---|
| 10W-40, 15W-40 | 4.25 quarts (4.0 liters) | Mineral or synthetic blend | 5,000 – 7,500 miles (8,000 – 12,000 km) |
Please note that these are general oil specifications for the Opel C18NZ engine and specific recommendations may vary depending on the year and model of the vehicle. It is recommended to refer to the vehicle owner’s manual or contact a certified Opel mechanic for specific oil specifications and intervals.
Fuel consumption
A table of estimated fuel consumption for different Opel models equipped with the C18NZ engine:
| Vehicle Model | MPG (Miles per gallon) | L/100 km (Liters per 100 kilometers) |
|---|---|---|
| Opel Astra (1991) | 24 – 32 | 9.8 – 7.4 |
| Opel Kadett (1991) | 25 – 32 | 9.4 – 7.4 |
| Opel Vectra (1992) | 24 – 31 | 9.8 – 7.6 |
Please note that these are estimates based on official fuel economy ratings and actual fuel economy can vary depending on factors such as vehicle weight, transmission type, driving conditions, and more. It is recommended to refer to the official fuel economy ratings of a specific vehicle equipped with the C18NZ engine for a more accurate estimate.
What cars use the C18NZ 1.8l
| Astra F (T92) | 1991 – 1994 |
| Kadett E (T85) | 1990 – 1991 |
| Vectra A (J89) | 1988 – 1995 |
Maintenance for the Opel C18NZ
Is a table of the maintenance intervals and costs for the Opel C18NZ engine:
| Maintenance Task | Interval | Cost Range |
|---|---|---|
| Oil and Filter Change | 5,000-7,500 miles (8,000-12,000 km) | $50-$100 |
| Air Filter Replacement | 15,000-30,000 miles (24,000-48,000 km) | $20-$50 |
| Spark Plug Replacement | 30,000-50,000 miles (48,000-80,000 km) | $100-$200 |
| Timing Belt Replacement | 60,000-80,000 miles (96,000-128,000 km) | $400-$600 |
| Water Pump Replacement | 60,000-80,000 miles (96,000-128,000 km) | $200-$400 |
| Fuel Filter Replacement | 30,000-50,000 miles (48,000-80,000 km) | $50-$100 |
| Transmission Fluid Change | 30,000-60,000 miles (48,000-96,000 km) | $100-$200 |
| Differential Fluid Change | 30,000-60,000 miles (48,000-96,000 km) | $50-$100 |
| Brake Fluid Change | 2 years or 30,000 miles (48,000 km) | $50-$100 |
| Coolant Flush and Fill | 2-5 years or 30,000-50,000 miles (48,000-80,000 km) | $100-$200 |
Please note that the costs listed above are rough estimates and may vary depending on the location, the mechanic, and the specific parts used. It is recommended to refer to the vehicle owner’s manual or contact a certified Opel mechanic for specific maintenance recommendations and costs.
Reliability and problems
The Opel C18NZ engine is generally considered to be a reliable engine, with a reputation for durability and longevity. However, like any engine, it is not without its potential problems. Here are some of the common issues and problems associated with the Opel C18NZ engine:
- Oil leaks: The engine is known to develop oil leaks over time, particularly around the valve cover gasket and camshaft seals.
- Timing belt failure: The timing belt is a critical component of the engine and should be replaced at regular intervals to prevent failure, which can cause serious engine damage.
- Overheating: The engine can experience overheating, which can be caused by a failed water pump, a clogged radiator, or a malfunctioning thermostat.
- Head gasket failure: The engine can experience head gasket failure, which can cause coolant to leak into the combustion chamber, leading to overheating and potential engine damage.
- Carburetor issues: The engine is equipped with a carburetor, which can experience issues such as clogs or leaks that can affect performance and fuel economy.
- Ignition issues: The engine can experience ignition problems, which can cause misfires and reduced performance. This can be caused by faulty spark plugs, ignition coils, or distributor components.
- Valve problems: The engine can experience issues with the valves, such as sticking or burning. This can be caused by a lack of proper maintenance or driving the engine at high speeds for extended periods of time.
- Fuel system problems: The engine’s fuel system can experience issues such as clogged fuel filters or failing fuel pumps, which can cause poor performance and fuel economy.
Overall, the Opel C18NZ engine is considered to be a reliable engine, with many examples achieving high mileage with proper maintenance. However, like any engine, it is not without its potential issues and problems. Regular maintenance and prompt repairs can help to prevent or mitigate many of these issues, ensuring the longevity and reliability of the engine.
Price range for a Opel C18NZ engine
| Condition | Price Range |
|---|---|
| Used | $500-$1,500 |
| Remanufactured | $1,500-$2,500 |
Please note that these prices are only a rough estimate and may vary significantly depending on the specific circumstances such as the condition of the engine, location, and supplier. It is recommended to research and compare prices from multiple suppliers before making a purchase decision. Additionally, it’s important to consider any additional costs such as installation fees, shipping costs, and taxes.
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