Nissan MRA8DE Engine Workshop Manual
Nissan MRA8DE Engine is a comprehensive repair and maintenance guide for the MRA8DE engine found in a variety of Nissan models. The book provides step-by-step instructions for disassembling, diagnosing, repairing, and assembling key engine components, including the cylinder head, intake system, cylinder block, and other components. The guide also includes diagrams, specifications, and maintenance recommendations, making it an indispensable resource for professional mechanics and car owners.
The MRA8DE is a 1.8-liter, 4-cylinder, DOHC, gasoline engine with a continuously variable valve timing (CVTC) system. It was developed for use in Nissan models such as the Sentra and Sylphy from 2012 onwards. The engine is designed with an emphasis on fuel efficiency, low emissions and reliable operation.
The MR family includes the following engines: MR15DDT, MR16DDT, MR18DE, MR20DE and MR20DD.
- Displacement: 1798 cc
- Bore: 79.7 mm
- Stroke: 90.1 mm
- Compression ratio: 9.9:1
- Power: 130 hp @ 6000 rpm
- Torque: 174 Nm @ 3600 rpm
- Fuel system: Multi-point fuel injection (MPI)
- Timing system: Chain (DOHC with 16 valves and variable valve timing)
- Materials: Aluminum cylinder block and aluminum cylinder head for light weight and improved thermal conductivity.
Nissan Sentra B17 2013-2019 MRA8DE
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MRA8DE Common problems, what to pay attention to
The Nissan MRA8DE engine has good reliability, but it has a few common problems that should be addressed to prevent serious problems:
1. Increased oil consumption
Description: Owners sometimes report increased engine oil consumption.
What to look for: Check the oil level and oil consumption regularly. Use only the recommended oil and change it every 7,000-10,000 km.
2. Timing chain (timing chain stretch)
Description: Timing chain stretching over time can lead to engine timing failures.
What to look for: Listen for unusual noises coming from the engine, such as cracking or knocking. If timing errors occur, it is recommended to check the condition of the chain.
3. Ignition coil failure
Description: Problems with the ignition coils can lead to misfires and unstable engine operation.
What to look for: Pay attention to unstable engine operation, misfires and loss of power. Replace faulty coils if necessary.
4. Clogged Exhaust Gas Recirculation (EGR)
Description: A clogged EGR valve can cause increased fuel consumption and reduced engine power.
What to look for: Watch for decreased engine performance and increased fuel consumption. Regular cleaning of the EGR valve is recommended.
5. Mass Air Flow (MAF) Sensor Problems
Description: Malfunctioning MAF sensors can cause engine performance issues, including fuel mixture problems.
What to look for: Symptoms include decreased power, rough running, and increased fuel consumption. Regular cleaning or replacement of the sensor can help prevent problems.
6. Engine Overheating
Description: Cooling system issues, such as a faulty thermostat or leaks, can cause overheating.
What to look for: Check coolant levels and the condition of the radiator, hoses, and thermostat. If the engine is overheating, stop and have the problem addressed immediately.
7. CVT Problems
Description: On models with a continuously variable transmission (CVT), problems with the transmission may occur that may also affect engine performance.
What to look for: Watch for jerking or hesitation when shifting gears, as well as any strange noises from the transmission.
8. Unstable Idle Speed
Description: Problems with sensors or the injection system may cause the engine to idle roughly.
What to look for: If the RPM jumps or the engine idles roughly, this may indicate problems with the throttle valve, fuel system, or sensors.