Removing the generator on a Nissan Murano Z50/Z51: step-by-step instructions with photos and nuances

Replacing the generator with Nissan Murano first (Z50, 2003–2007) and second (Z51, 2008–2014) generations - a problem that owners face when brushes, bearings wear out or the winding breaks. Unlike many modern crossovers, where the generator is hidden behind the bumper or under the fender, Murano access to it is relatively convenient, but it has its own pitfalls. For example, on models with an engine VQ35DE (3.5 l) you will have to remove the right headlight and partially disassemble the front bumper, and on diesel Murano (YD25DDTi) the algorithm is different.

In this article you will find detailed instructions with photos, a list of necessary tools, as well as unique tips for diagnosing generator malfunctions before removal - this will help avoid unnecessary work if the problem lies, for example, in the relay regulator or wiring. We will also look at what choose spare parts (original vs analogue), and we provide a table of generator compatibility for different years of manufacture Murano.

Preparing to remove the generator: tools and safety precautions

Before you begin dismantling, make sure you have everything you need. Working with electrical equipment requires special care - short circuit or incorrect disconnection of the terminals can damage not only the generator, but also ECU (electronic control unit).

Here minimal set of toolswhich you will need:

• 🔧 Set of sockets and ratchet wrench (sizes: 10 mm, 12 mm, 14 mm).
• 🔧 Extension for heads (at least 15 cm).
• 🔧 17 mm socket wrench (for the generator pulley nut).
• 🔧 Screwdriver with flat and Phillips blade (for removing plastic clips).
• 🔧 Jack and stand for the car (if you are working without a pit).
• 🔧 Multimeter (to check the voltage before and after removal).
• 🔧 Generator pulley puller (optional, but simplifies the task).
• 🔧 WD-40 or equivalent (for unscrewing soured bolts).

If you have Nissan Murano with engine VQ35DE, additionally prepare:

• 🔦 Flashlight with magnet (lighting in the generator niche is weak).
• 🔦 Plastic ties (for fixing removed pipes and wires).
• 🔦 A set of plastic spatulas (for removing bumper and headlight clips).

⚠️ Attention: Never disconnect the battery terminals while the engine is running - this may cause a power surge and damage the electronic components. Also avoid touching metal parts of the body and the generator terminals at the same time - static electricity can damage the diode bridge.

Before starting work necessarily:

1. Disconnect the negative terminal of the battery (10 mm wrench).
2. Remove the plastic engine cover (if equipped).
3. Clean the area around the generator of dirt and oil - debris getting inside can shorten the life of the new device.

Diagnosis of generator faults: when to remove and when not to remove

The problem does not always lie in the generator itself. For example, dim headlights or battery low may be caused by:

• 🔋 Faulty relay regulator (available separately on some models).
• 🔌 Oxidized contacts on the battery or generator terminals.
• 🔧 Alternator belt breaks or slips.
• 🔧 Damage to the wiring from the generator to the battery.

Before removing the generator, perform check with a multimeter:

1. Start the engine and measure the voltage at the battery terminals. Norm: 13.8–14.5 V.
2. If the voltage is lower 13 V or higher 15 V, the problem is in the generator or relay regulator.
3. Check the voltage at generator power cable (thick red cable) with the engine running. It should match the voltage on the battery.

If the diagnostics confirm a generator malfunction, proceed with removal. Otherwise, look for the cause in other elements of the electrical system.

Step-by-step instructions: removing the generator on a Nissan Murano with a VQ35DE engine

On petrol Murano with motor VQ35DE The generator is located in the upper right corner of the engine compartment. Access to it is blocked by the right headlight and partially by the bumper, so they will have to be removed. Follow the algorithm:

1. Removing the right headlight:
   • Unscrew the two headlight mounting bolts (10 mm wrench).
   • Disconnect the power connector (press the latch and pull it up).
   • Carefully remove the headlight without damaging the seal.
2. Partial removal of the bumper:
   • Remove the plastic clips in the right wheel arch (flat blade screwdriver).
   • Unscrew the bolt securing the bumper to the fender (10 mm wrench).
   • Move the bumper to the side to gain access to the generator.
3. Disconnecting the generator wires:
   • Remove the protective rubber cap from the terminal B+ (thick red wire).
   • Unscrew the nut securing the wire (10 mm wrench).
   • Disconnect the power connector of the field winding (press the latch).
4. Removing the generator:
   • Loosen the tension roller of the generator belt (14 mm wrench) and remove the belt.
   • Unscrew the two bolts securing the generator to the bracket (14 mm wrench).
   • Carefully pull the generator up, avoiding touching the radiator.

Check the compatibility of the new alternator part number with your Murano model|

Clean the generator seat from dirt and corrosion|

Lubricate the mounting bolts with graphite grease (will make future dismantling easier)|

Make sure that the new generator is equipped with a pulley (on some models the pulley comes separately) -->

On diesel Murano (YD25DDTi) the algorithm is simpler - the generator is located openly, and to remove it it is enough to unscrew the fasteners and loosen the belt. However, there is a nuance here: on diesel engines, the generator often “sticks” to the bracket, so treat the bolts before dismantling WD-40 and let stand for 10-15 minutes.

⚠️ Attention: On Nissan Murano 2008–2010 release from VQ35DE There is a defect in the generator bracket - it can crack under excessive force. If the bolts do not unscrew, do not use force: it is better to cut them off with a grinder and install new ones.

Comparison of generators for Nissan Murano: original vs analogues

When choosing a new generator, owners Murano are faced with a dilemma: to buy original (expensive but reliable) or analogue (cheaper, but the risk of defects is higher). The table below compares popular options:

Manufacturer	Article	Compatibility	Power (A)	Average price (RUB)	Features
Nissan (original)	23100-4M000	Murano Z50/Z51 (VQ35DE, 2003–2014)	110	22 000–28 000	2 year warranty, fully compatible
Denso	104210-5760	Murano Z50/Z51 (VQ35DE)	110	18 000–22 000	The quality is not inferior to the original, often installed on the conveyor
Bosch	0 986 041 920	Murano Z51 (2008–2014)	120	16 000–20 000	Increased power, suitable for cars with additional equipment
Valeo	438166	Murano Z50 (2003–2007)	100	14 000–17 000	Budget option, there may be problems with the relay regulator
Hella	8EL 011 671-001	Murano (diesel YD25DDTi)	140	20 000–24 000	High power for diesel engines

When purchasing an analogue, pay attention to:

• 🔧 Rated power — it must match the original or be higher (for example, for a car with powerful acoustics).
• 🔧 Pulley type - on Murano used 6PK (six-ribbed poly V-belt).
• 🔧 Availability of relay regulator — some generators are sold without it.

Installing a new generator and tensioning the belt

Installation of a new generator is carried out in reverse order, but there are several critical nuances:

1. Checking the relay regulator: If you are installing a used generator or similar, necessarily check the relay regulator with a multimeter. Connect it to the terminals B+ And D+, apply voltage 12 V — the working regulator must produce 14.2–14.5 V.
2. Belt tension: On Murano An automatic tensioner is used, but sometimes it jams. After installing the belt, check its deflection - it should be 8–10 mm when pressing with a finger between the generator and crankshaft pulleys.
3. Polarity check: When connecting the terminals, make sure that B+ (plus) goes to the battery, and D+ - to the charge lamp. Mixing up the wires will damage the diode bridge.

After installation:

1. Connect the battery and start the engine.
2. Check the voltage at the terminals - it should be 13.8–14.5 V.
3. Turn on the maximum load (headlights, heater, heated seats) - the voltage should not drop below 13.5 V.

⚠️ Attention: If the battery charge lamp on the instrument panel lights up after replacing the alternator, check the fuse F37 (10A) in the block under the hood. It is responsible for the excitation circuit of the generator and often burns out during a short circuit.

What to do if the new generator does not charge?

If after installing a new generator the battery does not charge, the reasons may be the following:

1. **The relay-regulator is faulty** (even on a new generator there are defects).

2. **Breakage in the wire from the generator to the battery** (check with a multimeter).

3. **The diode bridge is faulty** (check the diodes in the diode test mode).

4. **Weak belt tension** (check the deflection and operation of the tensioner).

5. **The terminals on the generator or battery are oxidized** (clean and lubricate with lithol).

Common mistakes when replacing a generator and how to avoid them

Even experienced craftsmen sometimes make mistakes that lead to repeated disassembly or failure of the new generator. Here top 5 misses and how to prevent them:

• 🔧 Ignoring belt checking. The old belt may break under tension, damaging the new alternator. Always install a new belt (part number for Murano: 11720-4M000).
• 🔧 Retightening of fastening bolts. This leads to deformation of the bracket. Tighten the bolts firmly 25–30 Nm.
• 🔧 Lack of lubrication on the pulley. The new generator should turn easily. Before installation, add 2-3 drops of oil to the pulley bearing.
• 🔧 The terminals are connected in the wrong order. Connect first D+ (thin wire), then B+ (thick).
• 🔧 Using an incompatible relay controller. For example, a relay from Nissan X-Trail not suitable for Murano — it produces a different voltage.

Another common mistake is Ignoring fault code in ECU. If the lamp on the panel was on before replacing the generator Check Engine, after installing a new device be sure to clear errors using a scanner (for example, ELM327). Often the code remains in memory P0620 (alternator circuit failure), which may mask other problems.

Generator maintenance: how to extend its life

Average generator resource per Nissan Murano — 150,000–200,000 km, but with proper maintenance this period can be increased to 300,000 km. Here key recommendations:

• 🔧 Check the belt tension every 20,000 km. Weak tension leads to slipping and wear of the pulley, strong tension leads to stress on the bearings.
• 🔧 Clean the alternator terminals from oxidation once a year. Use fine sandpaper and special lubricant (eg Liqui Moly Kupfer-Spray).
• 🔧 Avoid "lighting up" from other cars with a running engine. Voltage surges damage the diode bridge.
• 🔧 Monitor the electrolyte level in the battery. A low level results in increased load on the generator.
• 🔧 Do not wash the engine with high pressure. Water entering the generator causes corrosion of the windings.

If you frequently drive off-road or in high humidity conditions, it is recommended that you 50,000 km remove the generator and check:

• Condition of bearings (play or noise during rotation).
• Integrity of wire insulation.
• No corrosion on the diode bridge.

FAQ: Frequently asked questions about replacing the alternator on a Nissan Murano

Is it possible to replace the alternator on a Murano without removing the bumper?

On petrol models (VQ35DE) no — the bumper and headlight block access. On diesel (YD25DDTi) the generator is located openly and can be removed without disassembly.

Which alternator is suitable for other Nissan models?

On Murano Z50/Z51 suitable generators from:

• Nissan Pathfinder R51 (2005–2012, VQ40DE).
• Infiniti FX35/FX45 (2003–2008).
• Nissan Teana J31 (2003–2008, VQ35DE).

However, check compatibility by article number - for example, a generator from Pathfinder with article number 23100-4M010 not suitable for Murano 2010.

How long does it take to replace a generator?

On petrol models (VQ35DE) from an experienced master it takes 2–3 hours, for a beginner - up to 5 hours. On diesel (YD25DDTi) the process takes 1–1.5 hours.

What should I do if the belt whistles after replacing the generator?

Reasons for whistling:

• Weak tension (tighten the belt).
• Oil or coolant gets on the belt (clean with alcohol).
• Worn pulley overrunning clutch (replace clutch or pulley).

Is it possible to drive with a faulty generator?

Highly not recommended. Without charging, the battery will be discharged within 30–60 minutes drive, after which the engine will stall. In addition, power surges can damage ECU, control units ABS And ESP.