Nissan Quest V42 Engine Full Workshop Manual

This repair manual provides detailed instructions for servicing and rebuilding the VQ35DE engine. It covers all essential components, including:

1. Engine Disassembly and Reassembly: Step-by-step guidance on removing and reinstalling major parts such as pistons, crankshaft, camshafts, and cylinder heads.

2. Troubleshooting Common Issues: Diagnostics for oil leaks, overheating, misfires, and timing chain problems.

3. Torque Specifications: Precise torque values for bolts, bearings, and other critical fasteners.

4. Maintenance Procedures: Guidelines for routine maintenance like oil changes, valve adjustments, and coolant system care.

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The VQ35DE engine is known for its performance and reliability, but like any engine, it has some common issues. Here are the typical problems associated with the VQ35DE and tips on how to prevent them:

1. Oil Consumption and Leaks:

• Problem: Excessive oil consumption, oil leaks from valve covers, and oil pan gaskets are common. This can lead to low oil levels, potentially causing engine damage.
• Prevention: Regularly check oil levels and inspect the engine for leaks. Replace gaskets and seals as needed, and use high-quality engine oil.

2. Timing Chain Tensioner Failure:

• Problem: Over time, the timing chain tensioners may wear out, causing a rattling noise, especially on cold starts. This can lead to timing chain slack, which may affect engine timing and performance.
• Prevention: Perform regular oil changes with recommended oil grades, as clean oil helps maintain tensioner performance. If rattling noises occur, replace the timing chain tensioner and related components promptly.

3. Catalytic Converter Failure:

• Problem: The catalytic converters in VQ35DE engines can become clogged or fail, leading to reduced performance and potential engine damage if fragments are sucked into the engine.
• Prevention: Use high-quality fuel and replace oxygen sensors when needed to prevent excess fuel from damaging the catalytic converters. Regularly inspect and replace failing converters before they cause further engine issues.

4. Cooling System Issues:

• Problem: Overheating can occur due to a faulty thermostat, water pump, or radiator. This can lead to engine damage or head gasket failure.
• Prevention: Regularly flush and replace the coolant as per the manufacturer’s schedule. Inspect the water pump, radiator, and hoses for leaks or wear, and replace faulty components to maintain optimal cooling.

5. Mass Air Flow (MAF) Sensor Issues:

• Problem: The MAF sensor can become dirty or fail, causing rough idling, hesitation, or reduced fuel efficiency.
• Prevention: Periodically clean the MAF sensor with an approved cleaner and replace it if signs of malfunction arise.

6. Ignition Coil Failure:

• Problem: Ignition coils in the VQ35DE engine can fail, leading to misfires, rough running, and poor acceleration.
• Prevention: Replace spark plugs and ignition coils at regular intervals, and address misfires immediately to prevent further damage to the engine.

7. Knock Sensor Issues:

• Problem: The knock sensor can fail, causing the engine to run less efficiently or lose power as the ECU reduces ignition timing to avoid knock.
• Prevention: Replace the knock sensor when it fails, and ensure the engine is running with the proper fuel grade to prevent knocking.

8. Fuel Injector Problems:

• Problem: Over time, fuel injectors may become clogged, leading to poor fuel delivery, rough idling, and reduced performance.
• Prevention: Use fuel injector cleaner regularly and replace the fuel injectors if performance issues persist.

General Preventative Measures:

• Regular Maintenance: Follow the manufacturer’s recommended maintenance schedule, including oil changes, coolant flushes, and filter replacements.
• Use Quality Parts and Fluids: Always use high-quality oils, coolants, and replacement parts to ensure engine longevity.
• Monitor Engine Performance: Pay attention to unusual sounds, warning lights, or changes in performance, and address issues early to prevent more costly repairs.