Operation Nissan Almera Classic requires regular maintenance, and replacing spark plugs is one of the key procedures to keep the engine running smoothly. Ignoring this simple action can lead to unstable engine operation, increased fuel consumption and a decrease in the dynamic characteristics of the car. Many owners mistakenly believe that factory parts last forever, but even the highest quality products have their service life, especially in the conditions of Russian roads and climate.
Regular replacement of consumables avoids costly repairs to the ignition system and catalytic converter. If you feel that the car is “troubling,” loses power when accelerating, or the idle speed begins to float, most likely the problem lies in worn-out spark plugs. In this article we will look in detail at how to choose the right kit, what tools you will need and how to do the replacement yourself without contacting service.
Replacement intervals and signs of wear
Manufacturer Nissan recommends routine replacement of spark plugs with Almera Classic every 30,000 kilometers. However, actual operating conditions often dictate their own rules, and the interval may require reduction. If you frequently drive in heavy city traffic, use your car for short trips, or use poor quality fuel, your spark plugs may fail sooner.
It is important to pay attention to symptoms that indicate the need for unscheduled replacement. The engine may run unstably, especially at idle, and misfires may be felt as jerks during acceleration. Also a sign of wear is an increase in fuel consumption and the appearance of black carbon deposits on the exhaust pipe.
- 🚗 Power Loss: The car accelerates poorly and has difficulty picking up speed on inclines.
- ⛽ Increased consumption: the volume of fuel consumed increases for no apparent reason.
- 💨 Smoky exhaust: Black smoke comes out of the chimney, which indicates incomplete combustion of the mixture.
- 🔦 Difficult start: The engine takes longer to start than usual, especially in the cold season.
Early diagnosis of problems allows you to maintain engine health and avoid detonation. If you notice at least one of the listed signs, do not delay your visit to the garage or service station. Timely replacement guarantees long-term operation of the ignition system and saves on fuel.
Selecting suitable candles and interpreting the markings
For engine G16 volume of 1.6 liters, installed on Nissan Almera Classic, candles with certain characteristics are suitable. Nickel spark plugs are the standard option, but many owners are switching to iridium analogues to increase their service life. When choosing, it is important to take into account the heat rating and the gap between the electrodes, since non-compliance with these parameters can lead to overheating or misfires.
Original candles from Nissan usually have part number 22401-6M40A. However, there are many high-quality analogues on the market from trusted brands, such as NGK, Denso or Champion. It is important not to fall for the tricks of sellers and buy products only from official dealers or large specialized stores to avoid counterfeits.
| Brand | Model | Electrode material | Service life (km) | Approximate price |
|---|---|---|---|---|
| Nissan | 22401-6M40A | Nickel | 30 000 | Average |
| NGK | BKR6E-11 | Nickel | 30 000 - 40 000 | Low |
| Denso | K20PR-U11 | Nickel | 30 000 - 40 000 | Low |
| NGK | BKR6EIX | Iridium | 60 000 - 80 000 | High |
When choosing, it is worth considering that iridium spark plugs are more expensive, but last much longer and provide a more stable spark. For budget solutions, standard nickel analogues from NGK or Denso, which have proven themselves to be reliable parts. The main thing is to make sure that the thread and size of the key correspond to the standard parameters of your car.
⚠️ Attention: Never install spark plugs with a known long life if their heat rating does not comply with the manufacturer’s recommendations. This can lead to engine overheating and destruction.
Necessary tools and workplace preparation
Before starting work, it is necessary to prepare all the necessary tools so that the process does not drag on. To replace spark plugs Nissan Almera Classic you will need a set of keys, which must include a 21 mm spark plug wrench with an extension and cardan. Also don't forget a torque wrench if you want to tighten the new parts to the correct torque.
In addition to the basic tools, you may need cleaning and protection products. It's a good idea to have a can of compressed air or a blow gun on hand to remove dirt from the spark plug wells before removing the old spark plugs. This will prevent debris from entering the cylinder, which could cause serious engine damage.
- 🔧 Candle key: 21 mm head with extension and universal joint.
- 🌬️ Cleaning agent: a can of compressed air or carburetor cleaner.
- 🛡️ Lubrication: copper paste or graphite thread lubricant.
- 🧽 Rags: clean cloth for wiping surfaces.
It is better to carry out work on a flat surface, preferably in a garage or on an overpass, to provide access to the engine. If you are replacing in the field, make sure the engine is completely cool to avoid burns when removing guards and touching hot parts.
- Torque wrench
- Regular ratchet wrench
- Special puller
- I work without tools
Step-by-step instructions for replacing spark plugs
The replacement process begins with dismantling the decorative plastic engine casing. It can be removed simply by pulling it up, as it is attached to plastic clips. Be careful not to break fragile latches, especially as they age and become brittle. After removing the casing, you will see the ignition coils, which block access to the spark plugs.
Next, you need to disconnect the electrical connectors from the coils. Usually they are attached to a latch that needs to be pressed out, after which the connector is removed with a slight pull towards you. Then unscrew the bolts securing the coils and carefully remove them from the spark plug wells. If the reel is tight, you can wiggle it slightly, but do not use excessive force.
☑️ Preparing to replace spark plugs
Now you can start unscrewing the old spark plugs. Use a spark plug wrench with extension and turn counterclockwise. If the spark plug is stuck, do not try to unscrew it with a sharp jerk - it is better to wiggle it a little with the wrench or use penetrating lubricant. After removing, carefully inspect the spark plug: the color of the soot can tell you about the condition of the engine.
Screw in the new spark plugs by hand until they stop, so as not to strip the threads in the cylinder head. Only then tighten them with a wrench. If you don't have a torque wrench, tighten until you feel slight resistance, but do not overtighten. The optimal tightening torque for the G16 engine is about 25 Nm.
What to do if the spark plug won't come out?
If the spark plug is very stuck, do not try to unscrew it by force. Apply a penetrating lubricant (such as WD-40) to the threads and let sit for 10-15 minutes. You can also lightly warm up the cylinder head with a hairdryer, but be careful with the plastic and wiring.
⚠️ Attention: It is strictly forbidden to tighten new spark plugs using only a spark plug wrench without first manually tightening the threads. This guarantees thread failure, which will require expensive repairs to the cylinder head.
Common mistakes and ways to prevent them
One of the most common mistakes when replacing spark plugs is improper tightening. Tightening too loosely can cause the spark plug to fly out or the gasket will burn out, while tightening too tightly can cause the thread to break. In both cases the consequences can be fatal to the engine, so always follow the recommended tightening torque.
Another mistake is debris getting into the cylinder when unscrewing the spark plug. Dust and dirt accumulated in the spark plug well can fall inside the cylinder and damage the piston group. Always use compressed air or a blow gun to clean out the well before removing the old part.
- ⛔ Thread failure: occurs when trying to twist a candle without manually baiting it.
- 🔥 Engine overheating: a consequence of installing spark plugs with the wrong heat rating.
- ⚡ Coil breakdown: may occur due to incorrect connection of the connector or damaged insulation.
- 💧 Moisture ingress: It is dangerous when washing the engine immediately after replacing spark plugs.
Some owners neglect to replace the ignition coil O-rings, considering them unimportant. However, an old ring can pass a spark to ground, causing engine problems. When replacing spark plugs, it is recommended to check the condition of the rings and replace them if necessary.
Before starting work, be sure to disconnect the negative terminal of the battery to avoid a short circuit when disconnecting the ignition coil connectors.
Checking operation after installation
After all the spark plugs are installed and the coils are returned to their place, you need to reassemble the engine in the reverse order. Install the decorative cover, connect the electrical connectors and make sure that all latches snap into place. Check carefully to see if there are any tools or unnecessary parts left under the hood.
Start the engine and let it idle for a few minutes. Listen to the operation of the motor: it should run smoothly, without vibrations or extraneous sounds. If the engine starts to run unstably, check that the connectors are connected correctly and the spark plugs are tight.
Correct installation of spark plugs and coils is the key to stable engine operation. If misfires occur after replacement, check the contacts and gaps.
Try to press the gas pedal smoothly, observing the engine reaction. It should gain momentum quickly and without delay. If you feel jerking or dips, one of the spark plugs may have been installed incorrectly or is defective. In this case, you will have to disassemble everything again and check each element.
FAQ: Frequently asked questions from owners
How often do you need to change spark plugs on a Nissan Almera Classic?
The recommended interval is 30,000 kilometers. However, when operating in difficult conditions (traffic jams, bad fuel), it is better to change them every 20,000 kilometers to maintain stable operation.
Is it possible to install iridium spark plugs instead of standard ones?
Yes, installing iridium spark plugs (for example, from NGK or Denso) is acceptable and even recommended. They last longer and provide a more stable spark, but are more expensive than conventional nickel counterparts.
What to do if the spark plug is stuck and cannot be unscrewed?
Don't use force. Use a penetrating lubricant and give it time to work. You can also lightly heat the threads, but be careful around the plastic parts. If all else fails, contact a professional.
Do I need to lubricate the threads of a new spark plug?
Yes, it is recommended to apply a thin layer of copper paste or graphite compound to the threads. This will make subsequent unscrewing easier and prevent the spark plug from sticking to the cylinder head.
How to check that the replacement was successful?
After starting the engine, it should run smoothly, without vibrations or jerking. When you press the gas, the reaction should be instantaneous. If everything works stably, it means the replacement was done correctly.