Spark plugs <em>Nissan Almera Classic</em> 1.6: articles, selection and replacement with your own hands

Owners Nissan Almera Classic with motor 1.6 l (K4M) sooner or later they face the need to replace spark plugs. Not only the stability of the engine, but also fuel consumption, acceleration dynamics, and in some cases, even the service life of the catalyst, depend on their condition. However, choosing the right candles for this model is not so easy: there are dozens of options on the market, and original articles from Nissan often duplicated by analogues with other numbers.

In this article we will look at original articles of candles for Almera Classic 1.6, their analogues from leading manufacturers, signs of wear and step-by-step replacement instructions. We will pay special attention to the nuances that even experienced car owners often miss - from the correct clearance to the tightening torque. If you want to avoid purchasing or replacement mistakes, this material will help you save time and money.

Original articles of candles for Nissan Almera Classic 1.6

Factory manufacturer recommends for engine K4M (1.6 l, 16 valves) spark plugs with article number 22401-4M500 or 22401-4M505. These numbers correspond to original parts Nissan, but in practice they are often replaced by analogues from NGK, Denso or Bosch. It is important to understand that even original candles can be supplied in different packaging - for example, under the brand Renault (since Almera Classic built on a platform Renault Symbol).

Main original items:

• 🔧 22401-4M500 - standard candle for most versions Almera Classic 1.6.
• 🔧 22401-4M505 — modification with improved characteristics for regions with low fuel quality.
• 🔧 22401-4M515 — option for cars with gas equipment (LPG).

Candles with article number 22401-4M505 often recommended for Russian operating conditions, as they better tolerate low-quality gasoline and temperature changes. However, their price can be 20-30% higher than standard ones 22401-4M500.

Analogues of original candles: what to choose?

If the original spark plugs Nissan are unavailable or their price seems too high, you can turn to analogues from trusted manufacturers. The main thing is to comply heat number And gap, which must correspond to the engine parameters K4M. For Almera Classic 1.6 optimal heat number - 6, and the gap is 0.9–1.1 mm.

The best analogues of the original candles:

Manufacturer	Article	Heat number	Gap (mm)	Notes
NGK	BKR6E-11	6	0.9	The most popular analogue, often installed on the conveyor Renault.
Denso	K20PR-U11	20 (≈6)	1.1	A good alternative for regions with cold climates.
Bosch	FR7DC+	7	1.0	A budget option, but requires more frequent replacement.
Champion	RC8YC	8	0.9	Suitable for vehicles with LPG.

Important: candles NGK BKR6E-11 And Denso K20PR-U11 interchangeable with the original 22401-4M500, but have slight differences in resource. For example, Denso often last longer on gasoline with an octane rating of 95 or higher.

⚠️ Attention: Do not use candles with a heat rating below 6 (For example, NGK BKR5E). This will lead to detonation and the risk of damage to the pistons, especially when driving at high speeds.

Signs of worn spark plugs

Spark plugs in Nissan Almera Classic 1.6 it is recommended to change every 30,000–40,000 km, but this interval may be shortened when using low-quality fuel or frequent short-distance trips. The following symptoms indicate the need for replacement:

• ⚡ Engine tripping - especially noticeable at idle or during acceleration.
• ⛽ Increased fuel consumption — worn-out spark plugs lead to incomplete combustion of the mixture.
• 🚗 Dips when accelerating — the engine “stalls” when you press the gas sharply.
• 🔥 Difficult start - especially in cold weather when a more powerful spark is required.
• 💨 Black or white carbon deposits on the electrodes - indicates improper operation of the ignition system or fuel mixture.

If you notice at least two of these signs, it is worth checking the condition of the spark plugs. To do this, you need to unscrew them and inspect them:

• 🔍 Normal Wear — light brown carbon deposits, uniform gap.
• 🛑 Oil coating - indicates problems with valve stem seals or piston rings.
• ⚡ Melted electrodes - a sign of detonation or overheating (possibly incorrect heat rating).

Step-by-step instructions for replacing spark plugs

Replacing spark plugs with Nissan Almera Classic 1.6 does not require special skills, but there are several nuances that are worth considering. For example, re-upholstery of spark plugs may damage the threads in the cylinder head, and shortness - loss of compression. The optimal tightening torque for the spark plugs of this engine is 20–25 Nm.

What you will need to replace:

• 🔧 Candle key on 16 mm with extension cord.
• 🔧 Torque wrench (optional, but recommended).
• 🧴 Penetrating lubricant (e.g. WD-40) - if the spark plugs have not been changed for a long time.
• 🧤 Gloves - to avoid getting dirt into the wells.

Step by step process:

1. Disconnect the negative terminal of the battery to avoid short circuit.
2. Remove the decorative engine cover (if equipped).
3. Disconnect the high-voltage wires from the spark plugs by pulling the caps (do not pull the wires!).
4. Blow out the spark plug wells with compressed air or clean them of dust to prevent dirt from getting into the cylinders.
5. Unscrew the old spark plugs counterclockwise. If they get stuck, use a penetrating lubricant and give it time to work.
6. Install new spark plugs, first checking the gap with a feeler gauge. Torque them 20–25 Nm.
7. Connect the high-voltage wires in reverse order.

⚠️ Attention: Never use spark plugs with damaged threads or cracked insulators. Even if they are new, a defect can lead to high voltage breakdown and cylinder failure.

Common mistakes when replacing spark plugs

Even experienced car owners sometimes make mistakes that can lead to serious damage. Let's look at the most common of them:

• 🔧 Using the wrong key - the spark plug wrench must exactly match the size of the spark plug (16 mm for Almera Classic 1.6). Using an open-end wrench or an unsuitable socket may damage the spark plug's edges.
• 🔥 Tightening by eye — an overtightened spark plug deforms the threads in the aluminum block head, and an undertightened spark plug leads to loss of tightness. Always use a torque wrench.
• ⚡ Ignoring Gap - even new spark plugs may have a gap that does not meet engine requirements. For K4M optimal clearance - 0.9–1.1 mm.
• 🛑 Replacing only part of the spark plugs — if you change spark plugs, then only as a set. Different wear or type of spark plugs will lead to uneven engine operation.

Another common mistake is debris getting into spark plug wells. Before removing the spark plugs, be sure to clean the area around them with compressed air or a vacuum cleaner. Even small particles entering the cylinder can lead to scoring on the mirror and costly repairs.

What to do if a candle breaks off in a well?

If the spark plug breaks off when unscrewing, do not try to remove it yourself - this may damage the threads in the cylinder head. Contact a service center that uses a special extractor. In most cases, the fragment can be removed without disassembling the engine, but sometimes the spark plug well needs to be replaced.

Candles for Nissan Almera Classic 1.6 with HBO

If your car is equipped with a gas cylinder unit (LPG), increased requirements are placed on spark plugs. Gas burns at a higher temperature than gasoline, so regular spark plugs may not be able to handle the load. For Almera Classic 1.6 with HBO, candles with colder heat number (For example, 7–8 instead of standard 6).

The best options for HBO:

• 🔥 NGK BKR7E — heat number 7, resistant to high temperatures.
• 🔥 Denso IK20 — iridium spark plugs with improved spark for gas.
• 🔥 Champion RC9YC — heat number 9, suitable for intensive use on gas.

When using HBOT it is also recommended reduce the spark plug replacement interval to 20,000–25,000 km, since gas is more aggressive to the electrodes. In addition, it is worth paying attention to ignition coil condition - when running on gas they wear out faster.

FAQ: Frequently asked questions about candles for Nissan Almera Classic 1.6

Is it possible to use iridium spark plugs instead of standard ones?

Yes, iridium spark plugs (eg NGK IFR6A11 or Denso IK20) suitable for Almera Classic 1.6 and have a number of advantages:

• More stable spark.
• Increased resource (up to 80,000–100,000 km).
• Best performance at high speeds.

However, their price is 3–5 times higher than standard candles, so it is economically feasible to install them only during intensive use or the use of gas equipment.

What gap should the spark plugs be for this engine?

For Nissan Almera Classic 1.6 (K4M) the optimal gap between the electrodes is 0.9–1.1 mm. If the gap is smaller, the spark will be weak, which will lead to misfire. If it is more, the load on the coils will increase, and the spark may not pierce the mixture, especially in wet weather.

You need to check the gap before installation new candles, since even in the original packaging it may differ from the declared one.

What happens if you don't change spark plugs on time?

Ignoring replacement of spark plugs leads to the following problems:

• Increased fuel consumption by 10–15%.
• Loss of power and dullness of the engine during acceleration.
• Damage to the catalyst due to incomplete combustion of fuel.
• Risk of detonation, which destroys pistons and rings.

In advanced cases, worn out spark plugs can cause breakdown of the ignition coil, the repair of which will cost much more than timely replacement of spark plugs.

Is it possible to clean spark plugs instead of replacing them?

Cleaning the spark plugs (for example, by sandblasting or chemical means) is possible, but this is a temporary solution. Even after cleaning:

• The electrodes become thinner, which deteriorates the quality of the spark.
• A ceramic insulator may have microcracks that are not visible to the eye.
• The resource of such candles is reduced by 2–3 times.

It is advisable to carry out cleaning only in emergency cases (for example, on the road), but not as an alternative to replacement.

Which spark plugs are better - NGK or Denso?

Both brands produce high-quality candles, but there are nuances:

• NGK often installed on a conveyor Renault-Nissan, therefore they are considered more “native” for Almera Classic.
• Denso have a slightly different electrode design, which in some cases improves ignition of the mixture.
• By resource iridium spark plugs Denso IK20 often superior to analogues NGK, but also cost more.

For standard operation, the difference is not fundamental - the main thing is that the spark plugs correspond to the part numbers and the gap.