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QG18DE Engine 1.8L Review

QG18DE Engine 1.8L

The QG18DE engine is the same as the 1.6-liter QG16DE, but it has the bigger bore (80.0 mm). As a result, its displacement is 1.8 liter. That gave more torque at low rpm. But these 1.8 and 1.6-liter engines are very similar.

The QG18DE uses the same variable valve timing system (CVTC) on the same camshaft, timing chain, variable geometry intake manifold with valves, cylinder head, etc. There are no hydraulic tappets in the engine also (every 60,000 miles, please, visit service for valve gap/clearance adjustments). The engine is quite ordinary, nothing special, no high technologies and that is because it will run long mileage smoothly.

Engine Specs

Manufacturer
Atsuta Plant, Aguascalientes plant
Production years
1999-2006
Cylinder block material
Cast Iron
Cylinder head material
Aluminum
Fuel type
Gasoline
Fuel system
Electronic fuel injection
Configuration
inline
Number of cylinders
4
Valves per cylinder
4
Valvetrain layout
DOHC
Bore, mm
80.0
Stroke, mm
88.0
Displacement, cc
1769
Type of internal combustion engine
Four-stroke, naturally aspirated
Compression Ratio
9.5
Power, hp
116-125/5600; 128/6000
Torque, lb ft
130/4000
Engine weight
Firing order
1-3-4-2
Engine oil weight
5W-20, 10W-30, 15W-40
Engine oil capacity, liter
2.7
Oil change interval, mile
10,000
Applications
Nissan Almera, Nissan Primera, Nissan Pulsar, Nissan Sentra, Nissan Sunny, Nissan Expert, Nissan Avenir

Nissan QG18DE Engine Problems and Reliability

1. The engine consumes too much oil. That is the unique feature of that engine. Usually, consumption is up to 0.5 liters per 600 miles (1,000 km). If it is around 1 liter, you should contact with service or auto repair shop.
2. There is a problem with the idle valve gasket. Eventually, antifreeze starts leaking directly into the engine control unit. Replacement of the gasket fixes the issue.
3. The timing chain is unreliable. It is better to replace the timing chain at 100,000 mileage.

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