VQ23DE Engine Factory Workshop Manual

"Nissan VQ23DE Engine Repair Manual" is a detailed technical guide for auto mechanics and car owners. It contains all the necessary instructions for diagnosing, servicing and repairing the VQ23DE engine. The book includes diagrams, technical data, the order of disassembling and assembling parts, as well as troubleshooting tips. This is an indispensable source of information for those who want to professionally approach the repair and maintenance of their engine.

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The VQ20 series also includes the following engines: VQ20DE, VQ25DE, VQ25DET, VQ25DD and VQ25HR

• Hydraulic compensators: no
• Timing drive: three chains
• Phase regulator: on the intake CVTC
• Turbocharging: no
• What kind of oil to pour: 4.0 liters 5W-30
• Approximate resource: 320,000 km
• Compression ratio: 9.8
• Engine power: 173 hp
• Exact volume: 2349 cm³
• VQ23DE engine weight: 180 kg
• VQ23DE fuel consumption: 8.3-13.7L
• What cars was the VQ23DE engine installed on: Cefiro, Teana

1. Timing chain problems

Signs: Timing belt noise, loss of power, misfiring.

Cause: Worn chain or tensioners, especially at high mileage. The chain can stretch, causing incorrect valve timing.

Solution: Regularly check the condition of the chain and replace the tensioners or the chain itself if necessary.

2. Worn valve seals

Signs: Blue smoke from the exhaust pipe, increased oil consumption.

Cause: Worn valve seals, especially at high mileage.

Solution: Replace the valve seals.

3. Oil leaks

Signs: Oil stains under the car, low oil level.

Cause: Valve cover or oil pan gaskets can begin to leak oil with age.

Solution: Check and replace gaskets.

4. Sensors (MAF, oxygen sensor, crankshaft position sensor)

Signs: Unstable engine operation, loss of power, increased fuel consumption.

Cause: Sensors can become dirty or fail over time.

Solution: Clean or replace faulty sensors.

5. Engine overheating

Signs: Rising engine temperature, boiling antifreeze, overheating at idle.

Cause: Clogged radiator, problems with thermostat or water pump.

Solution: Check the cooling system, replace faulty components.

6. Problems with the fuel supply system

Signs: Difficulty starting the engine, interruptions in idling, loss of power.

Cause: Clogged injectors, faulty fuel pump.

Solution: Clean or replace injectors, check and replace the fuel pump.

7. Worn piston rings

Signs: Increased oil consumption, blue smoke from the exhaust pipe.

Cause: Worn piston rings, which leads to oil leaks into the combustion chamber.

Solution: Major engine repair with replacement of piston rings.