Nissan Almera Classic under the hood: photos, diagram and secrets of the engine compartment

Nissan Almera Classic is a legendary sedan that still remains in demand on the secondary market due to its simplicity of design, reliability and availability of spare parts. However, even such a time-tested car has its pitfalls, especially when it comes to the engine compartment. In this article we will not just show photo of the engine compartment with detailed markings of nodes, but we will also open technical nuancesthat will help you avoid common mistakes during repair or maintenance.

You will learn how the engines differ QG15DE And QG16DE visually where the “weak points” are located (for example, Throttle problems on pre-2010 models), and how to correctly identify original parts among counterfeit ones. And also - exclusive Photos from Nissan factory catalogs, which are rarely found in the public domain.

Photo of the engine compartment of Nissan Almera Classic: what is where

Engine compartment Almera Classic (in the back N16) is organized rationally, but for beginners it may seem confusing due to the dense layout. Below - interactive diagram with the main components (clickable high-resolution photos can be found at the end of the article).

From left to right in the engine compartment there are:

• 🔋 Battery (60 Ah, positive-right polarity). On models after 2008, the terminals are protected by plastic caps.
• 🛢️ Washer reservoir (4.5 l) with white cap. Often cracks over time - check for leaks!
• 🔥 Fuse box (black box under the windshield). Hidden in it fuse No. 32 (10A) - the culprit of 80% of problems with the cigarette lighter.
• ⚙️ Gearbox (manual or 4-speed automatic). In the photo it can be seen by the characteristic “hump” above the breather.

Pay special attention engine markings — it is stamped on the cylinder block on the right (if you look in the direction of travel). On QG15DE it will be QG15DE XXXXXX, where XXXXXX is the serial number. On QG16DE similar, but with a prefix QG16.

Engines QG15DE vs QG16DE: how to distinguish by photo

Both engines are representatives of the series QR, but have key differences that affect repairs and tuning. Outwardly, they are easy to confuse, but there are 3 reliable signs:

Sign	QG15DE (1.5 l)	QG16DE (1.6 l)
Volume	1498 cm³	1597 cm³
Valve cover	Smooth, without stiffeners	With longitudinal ribs (for better cooling)
Throttle valve	Mechanical drive (cable)	Electronic (on models after 2006)
Max. power	98 hp at 6000 rpm	107 hp at 6000 rpm

The photo below shows a comparison of valve covers. Please note intake manifold shape: y QG16DE it is wider and has an additional pipe for the system EGR (if installed).

Important for tuning: on QG15DE you can install the block head from QG18DE (with modification), but the ECU and firmware will need to be replaced. On QG16DE This upgrade is simpler - just change the camshafts and throttle.

Weak spots under the hood: what to look for when buying

Even the most reliable engine has Achilles' heels. U Almera Classic there are several of them, and they are all related to design features or the quality of materials. Here are the top 5 problems worth checking out before purchase:

1. Crankshaft oil seal leak (front). It manifests itself as oil streaks on the crankcase protection. On QG16DE occurs more often due to greater load.
2. Cracks in the cooling system pipes. The lower radiator hose is especially vulnerable - it becomes numb over time and bursts at sub-zero temperatures.
3. Throttle valve contamination. On engines with electronic throttle (QG16DE) this leads to floating speed at idle.
4. Engine mount bracket corrosion (left). If rust has consumed more than 50% of the metal, the support urgently needs to be replaced.
5. Failure of the crankshaft position sensor. Symptoms: the engine stalls while driving or does not start when hot.

⚠️ Attention: If on Almera Classic with mileage over 150 thousand km never changed hydraulic compensators, get ready to replace them - they start knocking when cold, and then when hot. The cost of a set of original compensators is from 8 thousand rubles.

You can check the condition of the motor by exhaust color:

• 🟢 Clear or slightly white smoke - the norm (especially in cold weather).
• 🔵 Blue smoke — oil enters the combustion chamber (wear of rings, valve stem seals).
• ⚪ Thick white smoke — antifreeze in the cylinders (the cylinder head gasket is broken or there is a crack in the block).

How to check compression without a compression gauge?

If you don’t have a device at hand, you can use the “old-fashioned method”: unscrew the spark plug, insert your finger into the hole and crank the engine with the starter. If the finger “shoots” with force, the compression is normal. If you barely feel the pressure, it’s time to make capital.

Location of fuses and relays: photo + explanation

Fuse box under the hood Almera Classic responsible for the main systems of the car: ignition, fuel pump, cooling fans, etc. Its scheme is the same for all years of manufacture, but there are nuances:

In the photo below - fuse markings (click to enlarge). Please note:

• 🔥 F10 (10A) - fuel pump fuse. If the car won't start, check it first.
• ⚡ F20 (15A) - responsible for ECU (electronic control unit). If it burns out, the engine will “trouble.”
• 🌀 R5 — cooling fan relay. If it is stuck, the engine will overheat.

A common problem: oxidation of contacts in the block due to moisture. To avoid this, remove the block once a year and treat the contacts spray for electronics (For example, CRC 2-26).

Cooling system: where to look for leaks and how to flush the radiator

Cooling system Almera Classic - one of the most vulnerable places, especially on cars older than 10 years. Main problems:

• 💧 Radiator leak (usually in the lower part where the plastic tanks connect to the aluminum core).
• 🔥 Overheating due to faulty thermostat. On QG16DE The thermostat opens at 87°C, at QG15DE - at 82°C.
• 🌀 Radiator honeycomb clogged fluff and dirt. This reduces cooling efficiency by 30-40%.

To flush the radiator without removing, follow the instructions:

1. Drain the antifreeze through the drain cock (lower radiator pipe).
2. Pour into the system distilled water + cleaning agent (For example, LIQUI MOLY Kuhler-Reiniger).
3. Start the engine and let it idle for 10-15 minutes.
4. Drain the solution and rinse the system with water 2-3 times.
5. Fill with new antifreeze (Nissan Coolant L248 Premix or equivalent).

⚠️ Attention: Never mix antifreeze of different colors! B Almera Classic filled from the factory green antifreeze based on ethylene glycol. If you add red (carboxylate), this will lead to the formation of sediment and clogging of the channels.

In the photo below - comparison of a new and clogged radiator. Pay attention to the condition of the honeycombs: if they are more than 50% clogged with dirt, the radiator must be replaced.

Tuning the engine compartment: what can be improved without harming the engine

Tuning Almera Classic It usually comes down to two things: improvement of appearance engine compartment and slight increase in power. Here's what you can do without risk to engine life:

• 🎨 Painting of engine compartment parts. Popular colors: matte black, silver or red (for a sporty look). Use heat resistant paint (Motip Duplicolor).
• 🔧 Replacing the air filter with a zero filter. Gives an increase of 3-5 hp, but requires more frequent replacement (every 10 thousand km).
• 🔥 Spider installation 4-2-1. Only suitable for QG16DE - on QG15DE the effect is minimal.
• ⚡ Chip tuning. ECU firmware (for example, from Hennessey) can add up to 10 hp, but requires the installation of decoys for lambda probes.

The photo shows an example before and after painting the engine compartment. Notice how the appearance has changed after processing the plastic parts black reducing agent (Sonax Plastic Deep Black).

Important: before any tuning, check the condition catalyst. If it is clogged, all modifications will be pointless - the engine will be “choked” at high speeds.

Frequently asked questions about Nissan Almera Classic: debriefing

❓ Why does the engine run uneven when cold, but level out when hot?

This is a typical symptom wear of hydraulic compensators or throttle valve contamination. When cold, the clearances in the valve mechanism are larger, so knocking or vibration is heard. Solution:

1. Clean the throttle body with ABRO Carb & Choke Cleaner.
2. If it doesn’t help, replace the hydraulic compensators (original - Nissan 13201-4M500).

❓ Is it possible to install air conditioning on Almera Classic if it did not come from the factory?

Technically you can, but this will require:

• Compressor settings (suitable from Nissan Primera P12).
• Replacing the radiator with a model with a condenser.
• Laying lines and refilling with freon (R-134a, 500-600 g).

The cost of work is from 40 thousand rubles. It is cheaper to buy a car with an already installed air conditioner.

❓ What is the resource of the timing chain on QG15DE/QG16DE?

Official chain resource - 150-180 thousand km, but in practice it can stretch after 120 thousand km. Signs of wear:

• Knocking noise when starting cold (from the cylinder head side).
• Unstable idle speed.
• Error P0340 (camshaft position sensor).

Replacing the chain along with tensioners and dampers will cost 12-15 thousand rubles (including labor).

❓ Why did a white coating appear on the parts under the hood after washing?

This efflorescence — residues of detergent mixed with road dirt. You can remove them:

1. Flush the engine compartment with low pressure water.
2. Process details vinegar solution (1 part vinegar to 3 parts water).
3. Apply a protective coating (Turtle Wax Ice Seal).

If the plaque appears on electrical contacts (e.g. on the fuse box), clean them WD-40 Contact Cleaner.

❓ What oil should I fill in QG15DE/QG16DE?

Official recommendations Nissan:

• Viscosity: 5W-30 or 5W-40 (depending on climate).
• Specification: API SL/SM or ILSAC GF-3/GF-4.
• Volume: 3.2 l (with filter replacement).

Best options:

• Nissan Motor Oil 5W-40 (original).
• Mobil 1 ESP 5W-30 (for long replacement intervals).
• Liqui Moly Top Tec 4200 5W-30 (for turbocharged engines, but also suitable for naturally aspirated engines).