Crankshaft oil seals Nissan Almera Classic (body N16) - consumables that sooner or later require replacement. Their wear leads to oil leaks, engine contamination and the risk of serious breakdowns. If oil stains appear under the car, and a characteristic coating is visible on the cylinder block, it’s time to act.

In this article you will find detailed instructions for replacing the front and rear oil seals taking into account the characteristics of the engines GA16DE And QR20DE, which were installed on Almera Classic. We will analyze the signs of a malfunction, the necessary tools, common mistakes and give practical advice on how to save on repairs without sacrificing quality.

Important: the procedure requires accuracy and basic skills in working with a car. If you have never disassembled an engine, it is better to entrust the work to professionals. But if you decide to act on your own, follow our recommendations to avoid critical error - damage to the crankshaft journal when installing a new oil seal.

Signs of wear on crankshaft seals: when is it time to change them?

The crankshaft oil seals (cuffs) wear out gradually, and their malfunction can be noticed long before serious consequences occur. The main symptom is engine oil leak. But there are other indirect signs that are often ignored:

  • 🔴 Oil stains under the car after parking (especially in the area of the front or rear oil seal). On Almera Classic The front oil seal leaks more often due to its proximity to the timing belt.
  • 🔴 Oily timing belt or drive belts. If a shiny coating is visible on the belt, this is oil from under the oil seal, which is critical for the service life of the belt.
  • 🔴 Oil level drop between replacements (more than 200-300 ml per 1000 km). In this case, there may be no external leaks - the oil burns in the cylinders through damaged seals.
  • 🔴 Noise or vibration from the timing cover side. A worn oil seal can cause rotational imbalance.

On Nissan Almera Classic With a mileage of 150,000 km or more, the oil seals often “harden” over time, even if there are no external leaks. Their material loses elasticity, and at the first overheat or increase in pressure in the crankcase, a leak begins. Particularly vulnerable rear oil seal — replacing it is more difficult and requires removing the gearbox.

⚠️ Attention: If you ignore a front oil seal leak, oil ends up on the timing belt. This leads to its slippage, breakage and valve bending on engines GA16DE (and this is a major overhaul!). On QR20DE The risk is less, but still there.

What kind of oil seals are on the Nissan Almera Classic: part numbers and analogues

On Almera Classic two crankshaft oil seals are installed: front (from the timing side) and rear (from the flywheel side). Their sizes and part numbers depend on the engine type:

Oil seal type Original article Size (internal/external/thick) Popular analogues
Front (GA16DE) 12310-4M000 35×52×7 mm Corteco 10016000B, Elring 343.630, SKF 14635
Front (QR20DE) 12310-6M000 38×55×7 mm Corteco 10016200B, Febi 10162, Reinz 71-34363-00
Rear (all engines) 12326-4M000 72×90×10 mm Corteco 10016400B, Victor Reinz 71-34364-00, NOK TC-OS34364

When choosing analogues, pay attention to sealing lip material. The best option is oil seals with polyacrylate (ACM) or fluorine rubber (FKM) seal. They last longer at high temperatures. Cheap nitrile rubber (NBR) oil seals at Almera Classic rarely nurse more than 50,000 km.

Advice: buy oil seals only in trusted stores. Counterfeit original articles Nissan often found on the market. Original oil seals come in branded packaging with a hologram and are marked on the end.

📊 Which oil seal do you plan to change?
  • Front
  • Rear
  • Both
  • I haven't decided yet

Tools and materials: what you need for replacement

To replace seals with Nissan Almera Classic will be required specialized tool. Without it, the risk of damaging engine parts or incorrectly installing cuffs increases significantly. Here's the full list:

  • 🔧 Set of heads and knobs (necessarily with an extension for the rear oil seal).
  • 🔧 Torque wrench (to tighten the crankshaft pulley bolt with a torque of 100-120 Nm).
  • 🔧 Crankshaft pulley puller (For example, Lisle 63600 or equivalent).
  • 🔧 Mandrel for pressing oil seals (can be made from improvised means - more on that below).
  • 🔧 Sealant (For example, Loctite 574 or Permatex Ultra Grey for timing cover).
  • 🔧 Carburetor solvent or cleaner for degreasing seats.
  • 🔧 New bolts (crankshaft pulley bolt - disposable, article number 12306-4M000).

For the rear oil seal you will additionally need:

  • 🔧 Transmission puller (or the help of a partner to carefully remove the gearbox).
  • 🔧 New pan gasket (article 11140-4M000).
  • 🔧 Magnetic holder for bolts (so as not to lose them in the pallet).

If you plan to change the front oil seal, check the condition at the same time timing belt and rollers. On Almera Classic their resource is 60,000–80,000 km. If the belt is close to replacement, it is more logical to do everything at once.

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Before starting work, take photographs of the location of all connectors and pipes on the engine. This will save hours of time when reassembling, especially if this is your first time disassembling Almera Classic

Step-by-step replacement of the front crankshaft oil seal

Front oil seal on Nissan Almera Classic can be changed without removing the engine, but will require removal of the timing belt and crankshaft pulley. Important: if you have an engine GA16DE, first set the timing marks so as not to lose the phases.

Algorithm of actions:

  1. Drain the oil and remove the right front wheel + plastic mudguard.
  2. Loosen the crankshaft pulley bolt (you will need the help of a partner who will hold the brake in 5th gear).
  3. Remove the timing belt, having previously fixed the marks. On QR20DE additionally remove the upper timing cover.
  4. Remove the crankshaft pulley puller Do not knock with a hammer - you risk damaging the key!
  5. Remove the old oil seal a screwdriver or a special puller. Be careful not to scratch the seat.
  6. Clean the seat solvent and wipe with a lint-free cloth.
  7. Install a new oil seal using a mandrel (you can use an old oil seal as a guide). Press evenly, without distortions!
  8. Reassemble everything in reverse order, not forgetting about the new bolts and sealant on the timing cover.

Critical moment - pressing in the oil seal. If you warp it during installation, it will last at most 10,000 km. The mandrel should only press on outer metal rim seal, and not on the rubber part.

Make sure the timing marks match|

Check the cleanliness of the oil seal seat|

Apply a thin layer of sealant to the timing case cover|

Use a new crankshaft pulley bolt|

Check the timing belt tension after assembly -->

⚠️ Attention: On engines QR20DE When removing the crankshaft pulley, it may fall out key. It is small and easily lost. Prepare a magnet in advance or place it in a safe place.

Replacing the rear oil seal: difficulties and nuances

Rear oil seal on Almera Classic it’s more difficult to change - it’s required removing the gearbox and flywheel. Without a pit or lift, the work is almost impossible to complete. If you have a manual transmission, you can do without completely removing the gearbox, but with an automatic transmission you will have to remove it completely.

Main stages:

  1. Drain the gearbox oil and disconnect the driveshaft (on rear-wheel drive versions).
  2. Disconnect all connectors sensors and wiring going to the gearbox.
  3. Remove the starter and gearbox supports.
  4. Unscrew the bolts securing the gearbox to the engine (there are about 8 of them).
  5. Carefully move the gearbox back (at least 10 cm) to gain access to the flywheel.
  6. Remove the flywheel (crankshaft lock will be required).
  7. Remove the old oil seal and install a new one, as in the case of the front one.

The main difficulty is removing the gearbox alone. The box weighs about 30-40 kg, and without an assistant or a winch it is difficult to move it. Also, when reassembling, be sure to check alignment of the crankshaft and gearbox input shaft - misalignment will lead to rapid wear of the new oil seal.

Advice: if the oil seal is “stuck” and does not want to come out, do not try to knock it out with a hammer. Use self-tapping screw with hook: Screw it into the oil seal body and pull it out with pliers.

What to do if there is no mandrel for the oil seal?

You can make it from an old cylinder head or a thick-walled pipe of a suitable diameter. The main thing is that the mandrel presses evenly on the outer rim of the oil seal. An old flywheel cover (if it is intact) will do for the rear oil seal.

Typical replacement mistakes and how to avoid them

Even experienced craftsmen sometimes make mistakes when replacing oil seals. Nissan Almera Classic. Here are the most common:

  • ❌ Using an old crankshaft pulley bolt. It stretches when tightened and does not provide the required torque. The consequences are thread failure or pulley rotation.
  • ❌ Distortion of the oil seal during installation. Leads to instant leakage. Always use a mandrel!
  • ❌ Saving on sealant. Cheap sealant becomes dull after a year and begins to leak oil.
  • ❌ Ignoring timing marks on GA16DE. This is a guaranteed valve bend.
  • ❌ They forget about the crankshaft key during assembly. Without it, the pulley will not fit tightly, and the oil seal will quickly fail.

Another common problem is crankshaft surface damage when removing the old oil seal. If there are scratches on the shaft journal, the new oil seal will leak from day one. To avoid this, wrap the screwdriver in electrical tape before removing the cuff.

On Almera Classic with mileage over 200,000 km often found wear of the oil seal seat. If the diameter of the socket is increased, the new oil seal will hang loose. In this case it will help repair seal with increased outer diameter (For example, Corteco 10016000R for the front).

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If after replacement the oil seal leaks again, check the pressure in the lubrication system. On Almera Classic a clogged oil filter or faulty pressure relief valve can create excess pressure that pushes out the cuff.

How much does it cost to replace oil seals at a service center vs on your own?

Cost of replacing oil seals Nissan Almera Classic varies greatly depending on region and type of service. Here are the estimated prices for 2026:

Type of work Cost in service (₽) On your own (₽) Savings
Replacing the front oil seal 4 000–6 000 1,500–2,500 (spare parts + sealant) up to 70%
Replacing the rear oil seal 8 000–12 000 2 000–3 500 up to 75%
Replacement of both oil seals + timing belt 12 000–18 000 4 000–6 000 up to 70%

Replacing it yourself is more profitable, but requires time and tools. If you do not have an oil seal mandrel or a torque wrench, it will be cheaper to contact a service center. Also consider hidden costs:

  • 💰 Purchase of a specialized tool (pulley puller, mandrel).
  • 💰 Possible oil and filter replacement after work.
  • 💰 Risk of damaging parts during disassembly (for example, breaking a gearbox bolt).

Advice: if you decide to change the oil seals yourself, calculate in advance cost of error. For example, valve bending GA16DE will cost 50,000–80,000 rubles. If you are not confident in your abilities, entrust the work to a proven service.

FAQ: Frequently asked questions about replacing oil seals on Nissan Almera Classic

Is it possible to drive with a current oil seal if the leak is small?

It is possible, but not advisable. Even a small leak leads to:

  • 🔴 Contamination of the engine and engine compartment.
  • 🔴 Risk of oil getting on the timing belt (critical for GA16DE).
  • 🔴 Falling oil level and oil starvation.

If the leak has just begun to appear, you can temporarily use additives for rubber restoration (For example, Liqui Moly Gummi-Pflege), but this is not a solution to the problem.

What sealant is best to use for the timing case cover?

For Nissan Almera Classic fit:

  • 🔹 Loctite 574 (green, for flanges).
  • 🔹 Permatex Ultra Grey (gray, heat-resistant).
  • 🔹 Victor Reinz Reinzosil (especially for timing covers).

Do not use cheap silicone sealants - they cannot withstand temperature changes and begin to leak after 10,000–15,000 km.

Do I need to change the oil after replacing the seals?

Definitely! During disassembly, dirt inevitably gets into the engine, and there may also be remnants of old sealant. After replacing the seals:

  1. Fill with new oil (eg 5W-30 or 5W-40 according to specification API SN).
  2. Drive 500–1000 km and change the oil and filter again - this will remove any remaining contaminants.
Is it possible to replace the rear oil seal without removing the transmission?

Theoretically it is possible, but it is extremely difficult. On Almera Classic with a manual transmission, some craftsmen move the box 10–15 cm back without completely disconnecting it. However:

  • 🔴 Risk of damaging wiring or sensors.
  • 🔴 It is difficult to provide access to the flywheel.
  • 🔴 High chance of oil seal skewing during installation.

This method is not suitable for automatic transmissions - the box will have to be removed completely.

Which seals are better - original or analogues?

Original oil seals Nissan (12310-4M000, 12326-4M000) last longer, but also cost 2–3 times more than analogues. Good alternative:

  • 🔹 Corteco (Germany) - optimal price/quality ratio.
  • 🔹 SKF or NOK (Japan) - a high resource, but more expensive.
  • 🔹 Elring or Victor Reinz - a budget option for temporary replacement.

Avoid cheap Chinese oil seals without a brand - they often come with defects (uneven edge, low-quality rubber).