Arrangement of cylinders in Nissan Teana: diagram, numbering and order of engine operation

Owners Nissan Teana (especially models J31, J32 And L33) are often faced with the need to know exactly the location of the cylinders - be it replacing spark plugs, diagnosing misfires or repairing the cylinder head. Errors in numbering can lead to serious consequences: from incorrect installation of high-voltage wires to damage catalytic converter due to mixed up cylinders. In this article we will look at unique design features of the VQ and QR series engines, which were installed on Teana, and also give practical advice on working with cylinders.

Structurally Nissan follows the classic numbering scheme for V-twin and in-line engines, but there are nuances related to the direction of rotation of the crankshaft and the location of the transmission. For example, in VQ35DE (3.5 L) the first cylinder is located on the side generator, and in QR25DE (2.5 l) - from the side timing belt. These parts are critical when replacing the timing belt or tuning the ignition. Next, we will analyze each engine type in detail, provide visual diagrams and explain why standard numbering “rules” do not always work here.

Types of Nissan Teana engines and their layout

Nissan Teana over the years of production, it was equipped with three main types of engines, each of which has a unique cylinder layout:

• 🔧 VQ25DE (2.5 l, V6) - installed on Teana J31 (2003–2008). A classic V-shaped engine with a camber angle of 60°, where the cylinders are numbered from right to left (in the direction of travel).
• 🔥 VQ35DE (3.5 l, V6) - the most common option for J32 (2008–2013) and L33 (2013–2020). Here the numbering goes from left to right (against the flow), which often causes confusion.
• ⚡ QR25DE (2.5 l, R4) - in-line engine for basic versions J32 And L33. The cylinders are numbered in a standard way - from the crankshaft pulley to the gearbox.

It is important to understand that even within the same series (for example, VQ) the location of the cylinders may differ depending on the year of manufacture and modification. For example, in Teana J31 with VQ25DE the first cylinder is closer to the radiator, and in J32 with the same engine - closer to the cabin. This is due to a change in the layout of the attachments.

Cylinder numbering scheme for VQ25DE and VQ35DE (V6)

V-engines VQ have specific numbering, which depends on the side of the car. B Nissan Teana with VQ35DE (the most popular version) the cylinders are arranged as follows:

• 🔄 Left row (in the direction of travel): cylinders 1–3–5 (1st is closer to the radiator).
• 🔄 Right lane: cylinders 2–4–6 (2nd one is closer to the radiator).

For clarity, a table with the order of operation and location is presented:

Cylinder	Location (VQ35DE)	Operating procedure	Cylinder head side
1	Left row, closer to the radiator	1–2–3–4–5–6	Inlet
2	Right lane, closer to the radiator	—	Graduation
3	Left row, middle	—	Inlet
4	Right row, middle	—	Graduation
5	Left row, closer to the cabin	—	Inlet
6	Right lane, closer to the cabin	—	Graduation

⚠️ Attention: B VQ25DE (installed on Teana J31) the operating order of the cylinders is different: 1–2–3–4–5–6, but the numbering goes from right to left (opposite VQ35DE). This is critical when replacing ignition coils or high-voltage wires - by mixing up the sides, you risk damaging ECU.

Features of the QR25DE (2.5 R4) in-line engine

Inline 4-cylinder QR25DE installed on basic versions Teana J32 And L33. Here the cylinder numbering is standard for all in-line engines Nissan:

• 📍 Cylinder No. 1 - from the outside crankshaft pulley (closer to the radiator).
• 📍 Cylinder No. 4 - from the outside gearboxes (closer to the salon).

Operating procedure: 1–3–4–2. This scheme is universal for everyone QR series, including QR20DE And QR25DER (with direct injection). However, in Teana There is a nuance with this engine: due to the longitudinal position of the engine, access to the 4th cylinder is difficult (you have to remove the intake manifold).

⚠️ Attention: When replacing spark plugs with QR25DE never use a torque wrench with a force exceeding 20 Nm — the thread in the aluminum head breaks easily. Official tightening torque: 18–20 Nm.

Why do ignition coils often break in QR25DE?

In this engine, the coils are integrated into the spark plug wells, and when the O-rings wear, moisture enters the cavity, causing corrosion of the contacts. It is recommended to check the condition of the rings every 60 thousand km and, if necessary, replace them (article: 22448-JK00A).

Cylinder firing order: why it matters

The operating order determines the sequence of ignition of the air-fuel mixture in the cylinders. For Nissan Teana The following schemes are relevant:

• 🔥 VQ25DE/VQ35DE (V6): 1–2–3–4–5–6 (at 120° intervals).
• ⚡ QR25DE (R4): 1–3–4–2 (180° interval).

Violation of this order (for example, when high-voltage wires are connected incorrectly) leads to:

• 💥 Detonation and “knock of fingers” due to untimely ignition.
• 🔥 Overheating of the catalyst (exhaust temperature exceeds 900°C).
• 🚗 Jerks during acceleration and increased fuel consumption (up to +20%).

B VQ35DE the operating procedure is synchronized with the variable valve timing system CVTCSTherefore, errors in numbering may cause valve malfunction. For example, if you mix up the wires of the 2nd and 5th cylinders, ECU will fix errors P0302 And P0305 (misfire), but the real problem will be the incorrect spark sequence.

How to Identify a Bad Cylinder: Practical Methods

If the engine Teana troits or gives misfire errors (codes P030X), the first step is to identify the problem cylinder. To do this use:

1. Alternately turning off the ignition coils:

   With the engine running, remove the connectors from the coils one by one. If, when one of the cylinders is turned off, the nature of the engine does not change, this is a faulty cylinder.

2. Diagnostic scanner:

   Scanners type Launch X431 or Autel show gaps in real time. B VQ35DE The 3rd and 6th cylinders are more likely to suffer due to overheating (they are located closer to the turbine in supercharged versions).

3. Compression measurement:

   Norm for VQ35DE: 12–14 bar (dispersion between cylinders no more than 1 bar). B QR25DE compression should be 13–15 bar.

⚠️ Attention: B VQ35DE When checking ignition coils, do not disconnect the connectors for more than 5 seconds - this may lead to an error ECU by crankshaft position sensor (P0335).

Common mistakes when working with cylinders

Even experienced technicians make mistakes when servicing cylinders Nissan Teana. Here are the most common:

• 🔧 Mixed up high voltage wires:

  B VQ35DE the wires to the coils are of different lengths - this is a hint for the correct connection. However, in some restyled versions L33 the wires are unified, which increases the risk of error.

• 🛠️ Incorrect spark plug tightening torque:

  B QR25DE excess torque over 20 Nm leads to thread failure in the head. B VQ35DE spark plug tightening torque 25 Nm.

• 🔥 Ignoring timing marks:

  When replacing the timing belt with QR25DE Many people forget to align the mark on the camshaft sprocket with the protrusion on the cover. This leads to a phase shift and the pistons hitting the valves.

To avoid these mistakes, always check with service manual for a specific modification Teana. For example, in Teana J32 with VQ35DE and variator JF011E the procedure for removing the coils differs from versions with a classic “automatic” RE5R05A.

Recommendations for cylinder maintenance

To extend cylinder life Nissan Teana follow these tips:

• 🛢️ Oil and additives:

  B VQ35DE oil recommended Nissan 5W-30 SN (article KE900-90032). For QR25DE fits Mobil 1 0W-20. Avoid additives with aggressive detergent components - they destroy oil scraper rings.

• ⚡ Spark plugs:

  Original candles for VQ35DE: NGK PLZFR6A-11 (article 22401-JK00A). B QR25DE are installed Denso K16TR11. Change every 60–80 thousand km.

• 🔧 Coil diagnostics:

  Coil primary resistance VQ35DE there must be 0.5–0.7 Ohm, secondary - 8–12 kOhm. Check with a multimeter if errors occur. P030X.

B VQ35DE pay special attention to the condition valve stem seals — their wear leads to oil entering the combustion chamber and the formation of carbon deposits on the valves. Symptoms: blue smoke at startup and increased oil consumption (more than 500 ml per 1000 km).

FAQ: Frequently asked questions about Nissan Teana cylinders

Can Infiniti ignition coils be installed on the VQ35DE?

Yes, the coils are from Infiniti G35 (2003–2007) and FX35 fully compatible with VQ35DE in Teana J32. Their article number: 22448-AL50A. They have enhanced insulation and are less likely to fail under high loads.

Why do the hydraulic lifters in the QR25DE knock when cold?

This is a big problem QR25DE due to the design features of the lubrication system. The reason is insufficient oil pressure at startup. Solution: Use an oil with a viscosity 0W-20 and add additive Liqui Moly Hydro-Stossel-Additiv (article 1998). If the knocking does not go away, the hydraulic compensators need to be replaced (set: 13201-JK00A).

What is the service life of VQ35DE cylinders before the first major overhaul?

With proper maintenance VQ35DE withstands 300–350 thousand km without capital. Main "weak points":

• Wear oil scraper rings after 200 thousand km (symptom: oil consumption > 1 l/1000 km).
• Stretching timing chains after 150 thousand km (noise during startup).
• Valves stuck due to carbon deposits (if low-quality fuel was used).

B Teana L33 Since 2016, modified versions have been installed VQ35DE with reinforced piston pins, which increased the service life to 400 thousand km.

Is it possible to swap ignition coils between cylinders for diagnostic purposes?

Yes, this is one way to find a faulty coil. For example, if the error P0302 (misfires in the 2nd cylinder) moves to another cylinder after replacing the coil - the problem is in the coil. However, in VQ35DE It is not recommended to change coils between rows (left/right), since the length of the wires may not match.

What cylinder pressure is considered critical for the QR25DE?

If compression in any of the cylinders QR25DE fell lower 10 bar, and the spread between the cylinders exceeds 2 bar — the engine requires repair. Most often this is due to:

• Wear and tear piston rings (symptom: oil in spark plug wells).
• Burnout valve (usually graduation, as it heats up more).
• Crack in block head (rare, but occurs when overheating).

For an accurate diagnosis, carry out leak test (leak-down test).