Removing the generator on a Nissan Almera Classic: instructions with photos and tips

Dismantling the generator Nissan Almera Classic (also known as Nissan Sunny B10) is a task that owners face when replacing brushes, bearings or the entire assembly. Despite the apparent complexity, the procedure can be done even by a beginner if you strictly follow the algorithm and take into account the nuances of the design. In this article we will walk you through the process step by step, paying attention to key points: from tool preparation to reassembly.

Feature Almera Classic — compact engine compartment where access to the generator is limited to attachments. On engines QG15DE (1.5 l) and QG18DE (1.8 l) the removal algorithm is identical, but there are differences in the fastening of the brackets. We will consider a universal method suitable for both options, and also give recommendations on fault diagnosis and selection of spare parts.

Preparing for work: tools and safety precautions

Before you begin dismantling, make sure you have everything you need. The absence of even one key can stop the process halfway.

• 🔧 Set of open-end and spanner wrenches: required 10 mm, 12 mm, 14 mm And 17 mm (for pulley nut).
• 🔨 Ratchet handle with extension and heads of the same sizes.
• 🔩 A wrench or amplifier pipe for unscrewing stuck nuts.
• 🔌 Multimeter to check voltage (optional, but recommended).
• 🧰 Jack and stops (if you need to remove the right wheel for access from below).
• 🧴 Penetrating lubricant (WD-40 or Liqui Moly) for treating rusty joints.

Important: work for cold engine - this will eliminate the risk of burns and deformation of plastic elements. Disable negative battery terminal The first thing is to avoid short circuit. If the generator is removed for repairs, prepare a clean work area in advance - disassembling the unit on the ground can result in dirt getting into the bearings.

⚠️ Attention: On models with air conditioning, the compressor may block access to the lower mounting of the generator. In this case, you will need to loosen its bracket (key 14 mm), but it is not necessary to remove it completely.

Step 1: Disconnect electrical connections

Start by disconnecting all wires going to the alternator. The main thing here is not to confuse them when reassembling.

• 🔌 Remove first plastic protective cap from terminal B+ (usually red wire with a cross section of 6–8 mm²).
• 🔧 Unscrew the terminal securing nut with a wrench 10 mm and carefully remove the wire, do not pull on it - you risk damaging the contact.
• 🔌 Disconnect the chip with thin wires (usually black) by pressing the plastic lock. If the connector is stuck, do not use force - spray WD-40 and wait 5-10 minutes.

Tip: Take a photo of the wire location before disconnecting. This will help avoid confusion when connecting a new generator. If there are signs of oxidation on the terminals, clean them fine sandpaper or a special spray (Contact Cleaner).

Step 2: Loosen and Remove the Drive Belt

Alternator belt on Almera Classic It is tensioned by an automatic tensioner, but to remove it you will need to loosen the fastening.

1. Find tension roller (located to the right of the generator when looking in the direction of travel).
2. Key 14 mm rotate the roller counterclockwiseto release the belt tension.
3. Remove the belt from the generator pulley, and then from the other pulleys (crankshaft, pump, air conditioner).

Note: If the belt is worn (cracked, split), replace it immediately. For Almera Classic fit belt 6PK1720 (length 1720 mm, 6 streams). If you plan to install a new generator, it is also better to update the belt - the old one may slip on the new pulley.

⚠️ Attention: Do not use a screwdriver or pry bar to loosen the roller as this may damage the roller bearing. Only the key or head!

Step 3: Removing the generator mountings

Generator on Almera Classic It is attached to the engine with two bolts: upper (to the bracket) and lower (to the cylinder block). Access to the lower bolt is often difficult - you will need to remove the right wheel and fender liner.

Stage	Tool	Notes
Unscrew the top bolt	Key 14 mm + extension cord	The bolt may be hidden by the pipe bracket - they need to be temporarily removed.
Unscrew the bottom bolt	Head 14 mm + knob	Access from below! First remove the wheel and plastic mudguard.
Remove the generator from the bracket	Hands + mounting blade	Pull the generator upward, rocking from side to side. Don't pull the pulley!

Difficulties often arise with the bottom bolt - it can become stuck. In this case:

1. Process the thread WD-40 and wait 15–20 minutes.
2. Use wrench with extension to increase leverage.
3. If the bolt does not budge, try lightly tapping it with a hammer through a block of wood.

Step 4: Diagnose Generator Faults

Before putting the generator back or buying a new one, check the old one for functionality. Often the problem lies in small parts, which are cheaper to replace than the entire assembly.

• 🔍 Brushes: minimum length - 5 mm. If less, replacement is required.
• 🔄 Bearings: Rotate the pulley by hand. Play or noise indicates wear.
• 🔥 Diode bridge: Check with a multimeter in "diode" mode. A breakdown of at least one diode is the cause of undercharging.
• 🔋 Rotor and stator: Inspect for burnt or broken windings.

To check the generated voltage:

1. Connect positive probe multimeter to terminal B+ generator
2. Negative probe - to ground (for example, cylinder block).
3. Start the engine and increase the speed to 2000–2500 rpm.
4. Normal voltage - 13.8–14.5 V. If below 13 V, the generator is faulty.

How to check the generator without removing it?

Connect the multimeter to the battery (do not remove the terminals!). Start the engine: the voltage should increase from ~12.6 V to 13.8–14.5 V. If the increase is less than 0.5 V, the generator does not charge.

Step 5: New Generator Installation and Assembly

Installation is performed in the reverse order, but there are some nuances:

1. Clean before installation seat on the engine from dirt and old grease.
2. Tighten the lower mounting bolt not completely - this will make it easier to align the holes.
3. Make sure generator pulley fits into place without distortion. If the belt is tensioned crookedly, it will wear out quickly.
4. After installing the belt, check its tension: when pressing with your finger, the deflection should be 8–10 mm.

A critical mistake of many car owners is retightening of bolts. Tightening torque for generator mountings to Almera Classic:

• Top bolt: 25–30 Nm.
• Bottom bolt: 40–45 Nm.
• Pulley nut: 80–90 Nm (tighten only after complete assembly!).

Selection of spare parts: original vs analogues

For Nissan Almera Classic the original generator has an article number 23100-4M500 (for QG15DE) or 23100-4M505 (for QG18DE). The price of a new one is from 12,000 to 18,000 rubles. However, there are proven analogues:

Brand	Article	Price, ₽	Notes
Denso	104210-3870	8 500–10 000	The best price/quality ratio. Suitable for both engines.
Bosch	0 986 041 920	9 000–11 000	High resource, but may require modification of fasteners.
Valeo	583051	7 000–9 000	Budget option, but the build quality is worse than the original.

When purchasing a used generator, be sure to check:

• 🔄 Pulley play (let’s say minimal, no knocks).
• 🔍 Condition of the brushes (they should move freely in the holder).
• 🔥 Winding integrity (no burnt areas or burning smell).

⚠️ Attention: There are many fake generators on the market under the brands Denso And Bosch. Original parts have a logo engraving on the case and holographic stickers. Buy only from trusted suppliers!

Common mistakes and how to avoid them

Even experienced craftsmen sometimes make mistakes when working with a generator. Almera Classic. Here are the most common:

1. Ignoring belt check. An old belt may break under tension, blocking the pulleys. Always inspect it for cracks.
2. Mixed up wires. If you confuse B+ And D+, the generator will not charge the battery. Use a marker to mark.
3. Tightening the pulley before installing the belt. This leads to misalignment and accelerated wear of the bearings.
4. Saving on lubrication. New generator bearings require lubrication Litol-24 or Molykote.

Another typical problem is poor ground contact. If the battery does not charge after installing the generator, check:

• 🔋 Cleanliness of the terminal B+ on the generator.
• 🔌 Quality of engine grounding (mass wire from body to block).
• 🔧 Tighten all bolts - weak contact causes voltage drops.

FAQ: Answers to frequently asked questions

Is it possible to remove the generator on Almera Classic without a pit or lift?

Yes, but it's more complicated. You will need a jack, stops and removal of the right wheel + fender liner. The lower generator mounting bolt is accessible only from below.

Which generator is more powerful: QG15DE or QG18DE?

Generators are interchangeable, but QG18DE rated current is higher - 80 A against 70 A at QG15DE. If you install a 1.8 generator on a 1.5-liter engine, this is only a plus (especially if there is a lot of electronics).

What should I do if the battery light comes on after replacing the alternator?

There are several reasons:

1. Incorrect wire connection (mixed B+ And D+).
2. The new generator is faulty (defective diode bridge).
3. Poor ground contact or open circuit in the charging circuit.
4. ECU errors have not been reset (a diagnostic scanner is needed).

Start by checking the battery voltage with the engine running (should be 13.8–14.5 V).

How long does it take to replace a generator on an Almera Classic?

If you have the tools and experience - 1.5–2 hours. It may take 3-4 hours for a beginner, especially if the bolts are stuck. Removing the bottom fastening usually takes the longest.

Is it possible to drive with a faulty generator?

Briefly - no. Without charging, the battery will be discharged in 30–60 minutes (depending on the load). If the generator makes a squeaking or noise, but is still charging, you can drive to a service station, but you shouldn’t risk it - a sudden break in the belt can lead to pump failure (on Almera Classic it is driven by the same belt).