Removing the generator on a Nissan Murano Z51: complete instructions with nuances

Removing the generator Nissan Murano Z51 - a task that every owner of this crossover faces sooner or later. A faulty alternator can manifest itself as dim headlights, a dead battery, or even complete electrical system failure. Car services charge from 5 to 12 thousand rubles for such work, but if you have the tools and patience, you can do it yourself.

The main difficulty when dismantling the generator on Murano Z51 (2008–2014) - limited space under the hood and the need to partially remove additional elements. In this article we will analyze the process step by step, indicate key points, which are often missed in standard manuals, and we will warn you against common mistakes. We will pay special attention generator bracket fasteners - It can be easily damaged if handled carelessly.

Preparing for work: tools and safety precautions

Before you begin removing the generator, make sure you have everything you need. The absence of even one tool can delay the process for hours. Here minimum setwhich you will need:

• 🔧 Set of sockets and ratchet wrenches (required) 10 mm, 12 mm, 14 mm)
• 🔨 Extension for ratchet (at least 15 cm)
• 🔩 Flexible head socket wrench (for hard-to-reach bolts)
• 🔌 Multimeter (to check the voltage after installing a new generator)
• 🧲 Magnetic holder (so as not to lose small bolts in the engine compartment)
• 🛠️ Jack and stand (if you need to remove the engine protection)

No less important is car preparation:

1. Disable negative battery terminal (this will prevent short circuit).
2. Make sure the engine is completely cool - operating a hot engine is dangerous.
3. If you plan to remove the engine protection, prepare an inspection hole or overpass in advance.

⚠️ Attention: On Murano Z51 with engine VQ35DE The generator is located close to the exhaust manifold. If you move carelessly, you can get burned or damage the cooling system pipes.

Alternator location diagram for Murano Z51

Generator on Nissan Murano Z51 installed on the right side of the engine (in the direction of travel), next to the air conditioning compressor. Its fastening is carried out through bracket with three fixation points:

• 🔹 Top bolt (the most problematic - access to it is blocked by the intake manifold pipe).
• 🔹 Bottom bolt (requires ratchet extension).
• 🔹 Bolt attaching to the belt tensioner (often sticks, WD-40 may be required).

Below is a diagram of the location of key elements:

element	Location	Features of dismantling
Generator	Right side of the engine, under the air conditioning compressor	Accessory drive belt removal required
Generator bracket	Fixed to the cylinder block	The top bolt often sticks - use penetrating lubricant
Belt tensioner	To the left of the generator (in the direction of travel)	To release the tension you will need a wrench. 14 mm
Terminal block	On the back of the generator	The block retainer is fragile - do not pull the wires!

On Murano Z51 with VQ25DE (2.5 L) access to the generator is slightly easier than on VQ35DE (3.5 l), due to fewer attachments. However, in both cases The main difficulty is the top bolt of the bracket, which you have to unscrew almost by touch.

Step-by-step instructions for removing the generator

Now let's move on directly to the process. Follow the instructions strictly in order to avoid damage:

1. Removing the accessory drive belt:

   • 🔧 Loosen the belt tensioner nut (key on 14 mm).
   • 🔩 Turn the tensioner counterclockwise to loosen the belt.
   • 📌 Remove the belt from the generator pulley.

2. Disconnecting electrical connectors:

   • 🔌 Press the clamp and disconnect the wire block from the generator.
   • 🔋 Unscrew the nut securing the power cable (the key is on 10 mm).

3. Dismantling the generator:

   • 🔧 Unscrew the lower bolt securing the generator (the key is on 14 mm with extension cord).
   • 🔩 Unscrew the top bolt of the bracket (you will need a flexible head or universal joint).
   • 📌 Carefully remove the generator without touching the cooling system pipes.

Check the compatibility of the generator model with your engine (VQ25DE or VQ35DE)|

Clean the seat from dirt and old grease |

Check the condition of the drive belt - replace if worn |

Apply graphite grease to the mounting bolts to facilitate future dismantling-->

If the upper bracket bolt does not budge, do not apply excessive force - this may cause the threads in the cylinder block to break. In such cases it will help:

• 🔧 Penetrating lubricant (e.g. WD-40 Specialist or Liqui Moly MoS2).
• 🔥 Local heating of the bolt with a construction hairdryer (do not overheat - there are plastic elements nearby!).
• 🔩 Using an impact wrench (if you have access to pneumatic tools).

⚠️ Attention: On some Murano Z51 After 2012, the upper bolt of the bracket can be covered with a plastic cover of the intake manifold. It will have to be removed by unscrewing the 4 bolts on 10 mm.

Common mistakes and how to avoid them

Even experienced car owners make mistakes when removing the generator Murano Z51. Here are the most common ones and how to prevent them:

• 🔌 Damage to the terminal block: Do not pull on the wires - always press the locking tab before disconnecting. On Murano Z51 The block often breaks due to the fragile plastic.
• 🔧 Top bolt thread stripped: Use only high quality sockets (e.g. Hazet or King Tony) and do not use excessive force.
• 🔩 Lost bolts in the engine compartment: Always use a magnetic holder or secure the bolts with adhesive tape.
• 📌 Incorrect belt installation: After assembly, check the belt tension - the deflection between the generator and crankshaft pulleys should be 8–10 mm when pressed with force 10 kg.

Another common problem is mixing up wires when connecting a new generator. On Murano Z51 suitable for generator:

• 🔋 Thick red wire — power “+” (comes from the battery through the fuse).
• 🔌 Thin black wire — control from the ECU (often confused with “ground”).
• 📌 Block with 3–4 wires — signals from the phase sensor and tachometer.

What should I do if after installation the generator does not charge?

1. Check the fuse F37 (10A) in the mounting block (located under the steering wheel).

2. Make sure that the power wire (+) is securely attached to the generator and is not oxidized.

3. Check the voltage at the terminal with a multimeter B+ generator with the engine running - there should be 13.8–14.5 V.

4. If there is no voltage, check the charging relay (located in the relay box under the hood, usually R12).

Checking the generator after installation

Installing a generator is half the battle. It is equally important to make sure that it works correctly. Here step-by-step verification algorithm:

1. Visual inspection:

   • 🔍 Make sure the belt is not twisted and lies flat on all pulleys.
   • 📌 Check that there are no foreign objects in the generator pulley area.

2. Voltage check:

   • 🔋 Measure the voltage on the battery with the engine off - it should be 12.4–12.7 V.
   • 🔌 Start the engine and measure the voltage again - it should rise to 13.8–14.5 V.
   • 📊 Turn on the maximum load (headlights, heater, seat heating) - the voltage should not drop below 13.5 V.

3. Noise check:

   • 🔊 Listen to the generator at idle speed - extraneous noise (creaking, hum) may indicate a faulty bearing.
   • 🚗 Smoothly increase the speed to 3000 rpm — the generator should not “whistle”.

If the battery voltage does not rise above 12.8 V with the engine running, this may indicate:

• 🔋 Faulty diode bridge in the generator.
• 🔌 Open circuit in the excitation circuit (check the wire from the ECU to the generator).
• 📌 Insufficient belt tension (check the tensioner).

Choosing a new generator: original vs analogues

When purchasing a new generator for Murano Z51 Owners often have a question: should they buy the original or an analogue? Here is a comparison table:

Parameter	Original (Nissan)	High-quality analogues	Budget analogues
Article	23100-4M000 (VQ35DE), 23100-4M010 (VQ25DE)	Denso (item depends on the year), Mitsubishi Electric	Bosch, Valeo, Hella
Price, rub.	25 000–35 000	18 000–24 000	12 000–16 000
Resource, km	200 000–250 000	150 000–200 000	80 000–120 000
Warranty	24–36 months	12–24 months	6–12 months

When choosing an analogue, pay attention to:

• 🔧 Engine compatibility - generators for VQ25DE And VQ35DE not interchangeable!
• 🔋 Rated current - for Murano Z51 this is 120–140 A (check by VIN).
• 📌 Complete set - some analogues do not have a pulley or terminal block.

If you choose a budget option, give preference Bosch or Valeo — although they are cheaper than the original, they undergo quality control. Avoid lesser-known brands (eg. Fenox or Starline) - their generators often fail after 20–30 thousand km.

When should you contact the service?

Although removing the generator Murano Z51 This is a completely doable task for self-repair; there are situations when it is better to trust the professionals:

• 🔧 If the upper bolt of the bracket is torn off or has become so stuck that it does not give in even after heating.
• 🔌 If, after replacing the generator, errors light up on the instrument panel P0562 (low voltage on-board network) or P0620 (generator circuit malfunction).
• 📌 If the pipes of the cooling system or air conditioner were damaged during dismantling.
• 🔋 If the new generator does not charge, and independent diagnostics did not reveal the reason.

Cost of work in the service to replace the generator with Murano Z51 varies:

• 💰 Self-replacement — only the cost of the generator (12,000–35,000 rub.).
• 💰 Service (without spare parts) — 5,000–8,000 rub..
• 💰 Comprehensive replacement (with diagnostics) — 10,000–15,000 rub..

If you are not confident in your abilities, but want to save money, you can order only difficult stages (for example, unscrewing the top bolt), and do the rest yourself.

FAQ: Frequently asked questions about removing the generator on the Murano Z51

Is it possible to remove the alternator without removing the air conditioning compressor?

Yes, on Murano Z51 It is not necessary to remove the air conditioning compressor. However, for convenience, you can loosen its fastening and move it slightly to the side. The main thing is not to disconnect the air conditioner lines, otherwise the system will need to be recharged.

What kind of oil is in the Murano Z51 generator and does it need to be changed?

In generators Nissan Murano Z51 used heat resistant bearing grease (For example, Molykote BR2 Plus). When replacing bearings, the lubricant must be renewed, but this is not required during normal maintenance.

How to check that a new generator is working before installation?

Before installation:

1. Turn the generator pulley by hand - it should rotate smoothly, without play or extraneous sounds.
2. Check the field winding resistance with a multimeter (between terminals F And E) - must be 2.3–2.7 Ohm.
3. Make sure that the diode bridge is not “broken” (in continuity mode, the diodes should pass current only in one direction).

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

Belt whistling Murano Z51 most often caused by:

• Insufficient tension (adjust tensioner).
• If oil or antifreeze gets on the belt (replace the belt and fix the leak).
• Worn belt (replace even if visually it looks normal).

If the whistle does not disappear, check the alignment of the pulleys - perhaps the generator is installed skewed.

Is it possible to drive with a faulty generator if the battery is charged?

Theoretically it is possible, but highly undesirable. The battery will be discharged after 30–60 minutes drive (depending on the load), after which the engine will stall. In addition, if the battery is discharged, the ECU settings may be lost, which will lead to starting problems even after replacing the generator.