Replacement valve stem seals on Nissan Almera Classic (model N16, produced from 2006 to 2018) is one of those procedures that many car owners put off until the last minute. But in vain! Worn valve seals lead to increased oil consumption, smoke from the exhaust pipe and even risk occurrence of rings. If your engine (QR20DE or QG15DE) began to “eat” liters of oil, and black soot appeared on the candles - it’s time to act.

In this article we will look at all stages of replacement: from fault diagnosis to engine assembly. You will find out what tools you will need how to avoid common mistakes (for example, damaged valve guides) and how long the work will take. And also - unique nuances specifically for Almera Classic that cannot be found in general manuals, for example, features of working with the cylinder head (cylinder head) on motors with a system CVTC.

Signs of wear on valve stem seals on a Nissan Almera Classic

How do you know when it's time to change the caps? On Almera Classic Symptoms appear gradually and are easily confused with other problems. Here are the key ones markers:

  • 🔥 Blue smoke from the exhaust pipe when starting the engine (especially after a long period of parking) or when sharply pressing the gas. This is oil that burns in the chamber along with the fuel.
  • 🛢️ Increased oil consumption - more than 500 ml per 1000 km. On QR20DE The norm is considered to be up to 300 ml, at QG15DE - up to 200 ml.
  • 🕯️ Carbon deposits on spark plugs. If the electrodes are covered with a black oily coating, this is a direct signal.
  • 🔊 Knocking or clattering at the top of the engine when cold (disappears after warming up). The sound occurs due to increased clearances in the valve mechanism.

It is important to distinguish cap wear from occurrence of piston rings. If there are problems with the rings, smoke comes out constantly (not only during acceleration), and oil consumption can reach 1–2 liters per 1000 km. On Almera Classic With a mileage of more than 150,000 km, a combined malfunction often occurs - both the caps and rings are worn out.

⚠️ Attention! If you ignore the symptoms, the oil will begin to coke in the channels cylinder headwhich will cause the valves to jam. On engines QR20DE this is fraught with bending of the valves if the timing belt breaks.
📊 How often do you check the oil level in Nissan Almera Classic?
  • Every day
  • Once a week
  • Only before long trips
  • When the oil pressure light comes on

Which valve stem seals to choose for Nissan Almera Classic

There are caps from different manufacturers on the market, but not all are suitable for Almera Classic. Original oil seals from Nissan have an article number 13270-4M500 (for QR20DE) and 13270-5M000 (for QG15DE). Their average price is 800–1200 rubles for a set of 16 valves. However, many car owners choose analogues that are not inferior in quality, but are cheaper.

Manufacturer Article Price per set (16 pcs.), RUB Features
Nissan (original) 13270-4M500 / 13270-5M000 1000–1200 Soft rubber, long service life, but high price
Ajusa 14025200 400–500 Good quality, suitable for budget renovation
Elring 345.170 600–700 Reinforced caps, recommended for engines with mileage >200,000 km
Goetze 10-33033-01 500–600 German quality, but there are fakes

When choosing, pay attention to material: caps must be made of fluorine rubber (FKM) or acrylate rubber (ACM). Cheap rubber analogues quickly become tanned and begin to leak oil after 20–30 thousand km. Also check size: for QR20DE valve stem diameter - 6 mm, for QG15DE - 5.5 mm.

Advice: if you plan to replace the caps, purchase at the same time new valve guides (article 13210-4M500) and camshaft oil seal (13510-4M500). Replacing them is not necessary, but if the engine has already been disassembled, it is better to update all consumables.

Preparing for replacement: tools and conditions

Replacing oil seals with Nissan Almera Classic requires partial disassembly of the engine. You can't do it without special tools. Here minimum setwhich you will need:

  • 🔧 Set of sockets and ratchet wrenches (10, 12, 14 mm).
  • 🔨 Oil seal remover (for example, Lisle 65600 or equivalent).
  • 🔩 Torque wrench (for tightening bolts cylinder head with a torque of 90–110 Nm).
  • 🔧 Valve desiccant (for Almera Classic universal will do JTC 1043).
  • 🧲 Telescopic magnet (so as not to lose crackers when disassembling).
  • 🛠️ Sealant for cylinder head (For example, Loctite 574 or Abro 11-AB).
  • 🧴 Carburetor cleaner (for flushing channels cylinder head).

Also prepare workplace:

  • 🚗 The car must be parked on a flat surface (preferably in a garage with a pit or on a lift).
  • 🔌 Disconnect the battery (negative terminal first!).
  • 🧹 Protect open parts of the engine from dust and dirt (you can use polyethylene or rags).

If you have no experience with cylinder head, invite an assistant - some operations (for example, removing camshafts) are more convenient to perform with four people. Also prepare in advance camerato record the location of parts before disassembly.

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Before starting work, drain the oil from the engine - this will simplify access to the valve cover and prevent oil from getting into the cylinders.

Step-by-step instructions for replacing valve stem seals

The process of replacing caps Nissan Almera Classic takes 6–8 hours (depending on experience). The main thing is to take your time and follow the instructions. Below - step-by-step algorithm:

1. Removing the valve cover and camshafts

First remove air filter, throttle assembly and all pipes that interfere with access to cylinder head. Then:

  1. Unscrew the valve cover bolts (8 10mm wrench bolts).
  2. Remove the cover and remove any remaining old sealant.
  3. Set the tags timing belt according to factory risks (on the crankshaft and camshaft pulley).
  4. Loosen the belt tensioner timing belt and remove the belt.
  5. Unscrew the camshaft mounting bolts (2 bolts for each shaft, tightening torque - 100 Nm).
  6. Carefully remove the camshafts without damaging the seals.

2. Removing cotters and valve springs

This is the most critical stage. You will need desiccant:

  1. Install the piston of the first cylinder in TDC (top dead center).
  2. Secure the valve spring with a depressurizer and compress it.
  3. Use a telescopic magnet to remove the crackers (they get lost easily!).
  4. Remove the spring plate and the spring itself.
  5. Repeat for all 16 valves.

Make sure that the piston is at TDC|Secure the spring with a depressurizer|Remove the crackers with a magnet|Do not mix up the valves when reassembling-->

3. Replacing valve stem seals

Now you can remove the old caps and install new ones:

  1. Using a puller, carefully pull the old cap off the valve stem.
  2. Clean the valve stem from carbon deposits and oil (use carburetor cleaner).
  3. Place the new cap on the stem and press it in with a puller until it stops.
  4. Check that the cap is seated smoothly (without distortions).

Important: do not use hammer for pressing - this will damage the cap! Only a special puller.

4. Engine assembly

Reassemble everything in reverse order:

  1. Install the springs and nuts on the valves (use a magnet!).
  2. Return the camshafts to their place and tighten the bolts to a torque of 100 Nm.
  3. Put on your belt timing belt and set the marks.
  4. Install the valve cover with new sealant.
  5. Connect all pipes and sensors.

After assembly do not start the engine immediately! First, turn the crankshaft by hand 2-3 turns to make sure nothing is seized.

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On a Nissan Almera Classic with a QR20DE engine, if the caps are installed incorrectly, the valve may become misaligned, which will lead to its bending if the timing belt breaks.

Common mistakes and how to avoid them

Even experienced craftsmen sometimes make mistakes when replacing caps on Almera Classic. Here are the most common ones problems and ways to prevent them:

  • 🔧 Damage to valve guides when removing the caps. Always use a puller, not a screwdriver!
  • 🔩 Incorrect tightening torque of cylinder head bolts. On QR20DE the bolts are tightened in 3 stages: 30 Nm → 60 Nm → 90 Nm.
  • 🔄 Confused valves during assembly. Before disassembling, take a photo of the location of the springs and crackers.
  • 🛢️ Oil getting into the cylinders. Before starting the engine, remove the spark plugs and crank the starter to remove any remaining oil.
  • 🔥 Failure to comply with timing marks. If the marks are knocked off, the engine will not start or the valves will bend.

Special problem Almera Classic — cylinder head bolt corrosion. If the bolts do not come off, do not use force! Process them WD-40 or liquid key and wait 10–15 minutes. If the bolt breaks, you will have to drill it out and cut a new thread.

⚠️ Attention! On engines QG15DE (1.5 l) after replacing the caps often occurs floating speed. This is due to a leak in the intake manifold. Check the condition of the manifold gasket and replace it if necessary (part no. 14045-4M500).

How much does it cost to replace valve stem seals on a Nissan Almera Classic?

The cost of the work depends on whether you do it yourself or contact a service. Let's consider both options:

Expense item On your own, ₽ In service, ₽
Oil seals (16 pcs.) 400–1200 800–1500 (with extra charge)
Cylinder head sealant 200–300 Included in the cost of work
Consumables (gaskets, seals) 500–1000 1000–1500
Operation (replacing caps) 0 8000–12 000
Total 1100–2500 10 000–15 000

The price of the service may vary depending on the region. In Moscow and St. Petersburg, the work will cost 10–12 thousand rubles, in the regions - 7–9 thousand. If you decide to major renovation (replacing rings, grinding in valves), the cost will increase to 20–30 thousand rubles.

Advice: if the car's mileage exceeds 200,000 km, it makes sense to replace it at the same time timing belts and attachments, and also pump (article 21010-4M500). This will save time and money in the future.

What should I do if the engine starts to shake after replacing the caps?

If the engine runs unstable after assembly, check:

1. Correct installation of timing marks.

2. Integrity of high-voltage wires and ignition coils.

3. The tightness of the intake manifold (on the QG15DE it often sucks air through the gasket).

4. Compression in the cylinders (must be at least 12 bar on QR20DE and 11 bar on QG15DE).

If the problem persists, the valves or guides may be damaged.

Frequently asked questions about replacing valve stem seals on Nissan Almera Classic

Is it possible to replace the caps without removing the cylinder head?

Technically yes, but it is extremely inconvenient and error-prone. On Almera Classic For a quality replacement, it is necessary to remove the camshafts, but without dismantling cylinder head it is almost impossible to do this. The risk of damaging valves or seals is too high.

How often do valve stem seals need to be changed?

The service life of the caps is 100–150 thousand km. However, in practice, they fail earlier due to poor oil quality, overheating or driving at high speeds. If oil consumption exceeds 500 ml per 1000 km, the caps are already worn out.

Is it possible to drive with worn caps?

It's possible, but it will lead to accelerated engine wear. Oil entering the combustion chamber forms carbon deposits on the pistons and valves, which impairs compression and can cause detonation. In advanced cases it will be necessary major renovation.

What kind of oil should I fill in after replacing the caps?

For QR20DE And QG15DE suitable oil 5W-30 or 5W-40 with permission API SN or ILSAC GF-5. After replacing the caps, it is recommended to reduce the oil change interval to 7–8 thousand km in order to wash out any remaining carbon deposits.

Do I need to grind the valves after replacing the caps?

If the valves have no visible damage (for example, burning), it is not necessary to grind them in. However, if the engine had a high mileage or was running with oil, grinding in will not be superfluous. It will improve tightness and compression.