Location of cylinders in the Nissan Almera G15: where is the 1st cylinder located and how not to make mistakes during repairs

Nissan Almera G15 - a popular sedan, which in Russia was equipped with two types of engines: 1.6 liter K4M (Renault-Nissan) and 1.6-liter HR16DE (purely Nissan). When diagnosing, replacing spark plugs, high-voltage wires or repairing the cylinder head, it is critical to know cylinder orderto avoid connection errors or damage to the motor. An error in determining the first cylinder can lead to ignition failure, engine tripping, or even failure of the coils.

In this article we will analyze unique feature of Almera G15: why the numbering of cylinders may differ on different engines, how to correctly identify them visually and with the help of documentation, as well as what mistakes car owners most often make when working with the ignition system. The material will be useful to both beginners and experienced mechanics who are faced with Almera for the first time.

What engines were installed on the Nissan Almera G15 and their features

On the Russian market Nissan Almera G15 (2012–2019) was equipped with two gasoline engines:

• 🔧 K4M (1.6 l, 102–114 hp) - developed by the Renault-Nissan alliance, installed on most cars. Has 16 valves, timing chain drive and aluminum block.
• 🔧 HR16DE (1.6 l, 110–117 hp) - pure Nissan engine with variable valve timing system CVTC. More modern, but less common in Almera.

The main difference between these motors is cylinder head design and ignition system. On K4M used custom ignition coils for each cylinder, and for HR16DE — ignition module (coils are combined into one block). This affects the order of connecting high-voltage wires and fault diagnosis.

Important: despite the same working volume, Cylinder numbering on these engines may differ due to different locations of auxiliary units (generator, air conditioning compressor). More on this in the next section.

Cylinder layout: where is the first cylinder located?

On both engines Almera G15 used in-line 4 cylinder layout (L4), but their numbering depends on the side from which the count is made. General rule for all Nissan engines:

⚠️ Attention: The first cylinder is always on the side accessory drive belt (where the generator and air conditioning compressor are located). On Almera G15 this is left side of the engine (when viewed from the radiator side).

Specific diagrams for each motor:

• 🔢 K4M: Numbering goes from left to right (1–2–3–4) when looking at the engine from the radiator side. The first cylinder is closer to the gearbox.
• 🔢 HR16DE: The numbering is also from left to right (1–2–3–4), but due to the different arrangement of the ignition coils, the order may visually appear to be reversed.

Engine	Cylinder order (front view)	Features
K4M	1 → 2 → 3 → 4	Individual coils, first cylinder next to gearbox
HR16DE	1 → 2 → 3 → 4	Ignition module, the first cylinder is visually “hidden” behind the generator
Both types	—	Operating procedure: 1–3–4–2

To avoid confusion, use markings on the engine itself. Numbers are often stamped on the cylinder block (on the dipstick side). If they are not there, focus on high voltage wires: The first wire goes to the leftmost cylinder.

How to determine the cylinder number in practice: 3 working methods

Theory is good, but in practice, especially in a tight engine compartment Almera G15, it's easy to make a mistake. Here three reliable ways determine the first cylinder:

1. According to the location of the accessory belt:

   Stand facing the radiator. On the left side of the engine you will see a belt that turns the alternator, air conditioning compressor and power steering pump. The cylinder closest to this belt is the first.

2. Through high voltage wires:

   On K4M wires go from the coils to the spark plugs. The first wire (usually the shortest) is connected to the first cylinder. On HR16DE refer to the markings on the ignition module.

3. According to the marks on the crankshaft pulley:

   Remove the timing belt guard. There is a mark on the crankshaft pulley that matches the mark on the block when positioned TDC 1st cylinder. This will help confirm the numbering.

If you are working with diagnostic scanner (For example, Launch X431 or ELM327), check the order of the cylinders in the parameters Misfire Data. Misfires are displayed there in relation to the cylinder number.

Typical mistakes when working with cylinders: what not to do

Even experienced craftsmen sometimes make mistakes, especially when working with them for the first time. Almera G15. Here the most common mistakes and their consequences:

• ⚡ Mixed up high voltage wires:

  If you connect the wires out of order, the engine will oscillate and the dashboard will light up. Check Engine. On HR16DE this can lead to failure of the ignition module.

• ⚡ Incorrect installation of spark plugs:

  Candles have different thermal characteristics. If you put a spark plug from the 1st cylinder to the 4th (and vice versa), the engine will overheat or run unstably.

• ⚡ Ignoring cylinder firing order:

  Operating procedure 1–3–4–2 important for engine balancing. If the wires are mixed up, engine vibration will increase and the life of the crankshaft bearings will be reduced.

⚠️ Attention: On HR16DE If the ignition coils are connected incorrectly, the ECU may record an error. P0300 (multiple misfires), which is not always possible to reset without flashing.

To avoid mistakes, always check with electrical circuit specific engine. For Almera G15 current schemes:

• 📄 EWM-K4M — for the K4M engine;
• 📄 EWM-HR16DE - for HR16DE.

What happens if you mix up the wires on the HR16DE?

On the HR16DE engine, the ignition module has a common ground for all coils. If the wires are mixed up, current will be supplied to the wrong cylinder, which will lead to detonation and the risk of damage to the pistons. In the worst case, the module itself may burn out (cost ~15,000 rubles).

Diagnosis of faults by cylinders: symptoms and error codes

If the engine Almera G15 troits or loses power, the first step is to determine which cylinder is not working correctly. Here key features and the corresponding error codes:

Symptom	Possible reason	Error code (OBD-II)
Engine stalls at idle	Misfire in cylinder 1 or 4	P0301, P0304
Vibration during acceleration	Malfunction of the spark plug or coil in the 2nd or 3rd cylinder	P0302, P0303
Power loss + black smoke	Rich mixture due to faulty injector	P0201–P0204 (by cylinder number)
Popping sounds in the exhaust system	Late ignition or blown cylinder head gasket	P0300 (random omissions)

For an accurate diagnosis:

1. Connect the scanner and check the error codes.
2. If the error is type P030X (where X is the cylinder number), swap spark plugs or coils from a known good cylinder. If the error has moved, the problem is in the spark plug/coil.
3. Check the compression in the problem cylinder (normal for K4M/HR16DE — 12–14 bar).

On HR16DE common problem - cracks in the ignition module, which lead to misfires in the 2nd and 3rd cylinders. This can be visually determined by traces of breakdown (black dots) on the module body.

Replacing spark plugs and coils: step-by-step instructions, taking into account numbering

When replacing spark plugs or coils with Almera G15 it is important not only to know the order of the cylinders, but also to observe sequence of actionsso as not to damage the threads or insulators. The instructions are suitable for both engines, but there are some nuances.

For K4M engine (custom coils):

1. Remove the connector from the coil of the first cylinder (closer to the gearbox).
2. Unscrew the coil mounting bolt (key on 10 mm).
3. Remove the coil and spark plug special spark plug wrench (length 16 mm, with a magnet).
4. Install a new spark plug, tightening it firmly 25–30 Nm (do not overtighten!).

For HR16DE engine (ignition module):

Here the process is more complicated due to the design of the module:

1. Disconnect the ignition module connector (there is one for all cylinders).
2. Unscrew the 4 module mounting bolts (key on 8 mm).
3. Remove the module and remove all 4 spark plugs at the same timeso as not to confuse the order.
4. Install new spark plugs, observing the tightening torque. 20–22 Nm (on HR16DE the thread is more fragile!).

⚠️ Attention: On HR16DE Candles with a long skirt cannot be used (for example, NGK BCPR6ES). They will hit the piston and damage the engine. Recommended item: NGK PLZFR6A-11 or Denso K16TT.

After replacement, check gap between electrodes (norm - 0.8–1.0 mm) and make sure that the high voltage wires (on K4M) or module connector (on HR16DE) are connected tightly.

Frequently asked questions about Nissan Almera G15 cylinders

Is it possible to install spark plugs from K4M on HR16DE?

No! Despite the same volume, these engines have different combustion chamber designs. Candles for K4M (For example, NGK BCPR6ES) have a longer threaded part and can rest against the piston on HR16DEwhich will damage the motor. Use only candles recommended for HR16DE: NGK PLZFR6A-11 or Denso FK16HR11.

How can you tell if the ignition coil on cylinder 3 is broken?

Signs of a broken coil:

• Engine trouble, especially when cold.
• Error P0303 (misfire in cylinder 3).
• Visually: black dots (traces of breakdown) are visible on the coil body.

To confirm, swap the coil of the 3rd cylinder with any other. If the error “moves” to another cylinder, the coil is faulty.

Why is it more difficult to change spark plugs on HR16DE than on K4M?

On HR16DE The ignition module is combined into one block, and to replace the spark plugs you need to remove it entirely. In addition, the spark plug wells are deeper, and there is a risk of breaking off the insulator when removed. Recommended to use extended spark plug wrench with magnet and pre-blow the wells with compressed air to avoid dirt getting into the cylinders.

What happens if you mix up the high voltage wires on the K4M?

If the wires are swapped, the spark will go to the wrong cylinder. This will lead to:

• Strong engine vibration.
• Errors P030X (misfire).
• Risk of detonation and damage to pistons during prolonged operation.

In practice, the engine will work, but with serious interruptions. Immediately turn off the engine and check the connection order!

How to check compression on cylinders without a compression gauge?

It is impossible to accurately measure compression without a device, but it can be done preliminary diagnostics:

1. Start the engine and let it warm up.
2. Disconnect the ignition coil connectors one by one (on K4M) or wires (on HR16DE).
3. If the engine operation does not change when the cylinder is disconnected, there is no compression in it (or the valve does not work).

⚠️ Attention: This method is approximate and may damage the catalyst due to incomplete combustion of the fuel. Use it only for express diagnostics!