HR12DE / HR12DDR Engine Workshop Manual

This manual covers the full range of technical procedures for servicing and repairing the 1.2-litre HR12DE & HR12DDR  petrol engine fitted to the Nissan Micra K13. Note, Almera, Kicks. The document provides detailed instructions on diagnosing, dismantling and disassembling the engine, as well as replacing key components such as pistons, valves, timing belts, spark plugs and fuel injectors. The manual also includes diagrams for connecting sensors, ignition and fuel injection systems, recommendations for adjusting valves and tuning engine management systems.

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• Exact volume: 1198 cm³
• Timing drive: chain
• Turbocharging: Eaton R410
• What oil to pour: 3.9 liters 0W-20
• Compression ratio: 12.0 - 13.0
• Engine power: 98 hp
• Approximate resource: 240,000 km
• Engine features: Miller Cycle

What models is the engine installed on:

Micra 4 / March (K13) 2011 - 2017, Note 2 (E12) 2012 - 2020

• Exact volume: 1198 cm³
• Timing drive: chain
• Turbocharging: no
• What oil to pour: 3.2 liters 5W-30
• Compression ratio: 10.7
• Engine Features: DOHC
• Engine Power: 79 - 84 HP
• Approximate resource: 250,000 km

What models is the HR12DE 1.2L engine installed on: Almera (N17), Note 2 (E12), Kicks 1 (P15), Micra 4 (K13), Note 3 (E13), Serena 5 (C27)

Increased Oil Consumption:

Some owners notice increased oil consumption, especially at high mileage. This may be due to worn piston rings or valve seals.

Noise and Vibration:

Because of the three-cylinder design, this engine can be noisy and prone to vibration, especially at idle. Vibration can be uncomfortable and can negatively impact the longevity of engine mounts and other components.

Ignition Coils:

Ignition coils can occasionally develop problems, which can result in misfires, rough engine operation, and poor vehicle performance.

Throttle Plate Contamination:

The throttle plate can become dirty over time, causing rough idling, hard starting, or loss of power.

Drive Belt Wear:

The drive belt and its tensioner can wear out faster than expected, requiring frequent inspection and possible replacement.

Regular Oil and Filter Changes:

Change the oil every 10,000–15,000 km (or more often if operating conditions are severe) using quality engine oil. Check the oil level regularly and top up as needed.

Check and Replace Spark Plugs:

Spark plugs should be checked every 30,000–40,000 km and replaced as needed to prevent misfires and keep the engine running efficiently.

Clean the Throttle Body:

Cleaning the throttle body is recommended every 30,000 km to avoid idling problems and other symptoms associated with contamination.

Check and Replace the Drive Belt:

Inspect the drive belt regularly for wear, cracks, and fraying. Replace the belt every 60,000–80,000 km to prevent sudden belt failure.

Checking the coolant level:

Check the coolant level and condition regularly to avoid engine overheating. Coolant replacement is recommended every 60,000 km or 5 years.

Noise and Vibration:

When purchasing a vehicle with an HR12DE engine, pay attention to how it idles. Excessive noise or vibration may indicate worn engine mounts or other problems.

Oil Consumption:

Check the oil level and pay attention to its consumption. If the engine requires frequent oil top-ups, this may indicate possible problems with piston rings or seals.

Misfires:

If the engine runs unevenly or loses power, this may be due to faulty ignition coils or a dirty throttle valve.

Inspect the Belt and Pulleys:

When servicing, always inspect the drive belt and pulleys for wear or damage.

Carbon deposits on valves:

The direct fuel injection system can cause carbon deposits to accumulate on the intake valves, which over time can result in reduced engine power, rough idling and increased fuel consumption. Regularly cleaning the intake system can help prevent this problem.

Timing chain wear:

In some cases, the timing chain can wear out prematurely. This can lead to valve timing shifts and even engine damage if the chain jumps. Regularly checking and replacing the timing chain is very important to prevent serious problems.

Sensitivity to fuel quality:

Due to turbocharging and direct injection, the engine is sensitive to fuel quality. Using low-quality gasoline can lead to detonation, clogged injectors and damage to the turbocharger. It is recommended to use only high-quality fuel and regularly clean the fuel system.

Turbocharger issues:

The turbocharger can fail due to lack of lubrication caused by contaminated oil or using low-quality oil. This can result in reduced power and increased fuel consumption. Regular oil and filter changes using manufacturer-recommended oils will help extend the life of the turbocharger.

Increased maintenance complexity:

The turbocharging and direct injection system makes the HR12DDR engine more difficult to service than naturally aspirated engines. This can mean higher repair and maintenance costs, as well as the need for more frequent visits to specialists.