Replacing the cylinder head gasket on a Nissan Almera N16: a detailed guide with photos and tips

Cylinder head gasket (cylinder head) in Nissan Almera N16 - a critical element that ensures the tightness of combustion chambers, cooling and lubrication systems. Its wear or breakdown leads to serious consequences: from engine overheating to antifreeze getting into the oil or vice versa. Owners Almera N16 with motors QG16DE (1.6 l) And QG18DE (1.8 l) They often encounter this problem after 150–200 thousand kilometers, especially if the car was operated with low-quality antifreeze or overheating.

Replacing the cylinder head gasket yourself Almera N16 - a difficult task, but doable with tools and patience. Car repair shops charge from 12 to 25 thousand rubles for this work (depending on the region), while the gasket itself costs only 1.5–3 thousand rubles. In this article we will analyze the entire process step by step: from fault diagnosis to assembly and first launch. We will pay special attention typical mistakes that lead to repeated repairs after 5–10 thousand km - for example, incorrectly tightening the cylinder head bolts or neglecting to check the flatness of the head.

Signs of a broken cylinder head gasket on a Nissan Almera N16

Symptoms of a bad head gasket are often disguised as other problems, so comprehensive monitoring is important. One of the most obvious signs is white smoke from the exhaust pipe, which does not disappear after warming up. This indicates that coolant has entered the cylinders. However, the smoke can also be gray (oil in the combustion chamber) or bluish (antifreeze mixed with oil).

Other warning signs:

• 🔥 Engine overheating for no apparent reason (the fan is working, the thermostat is working, the radiator is not clogged).
• 🛢️ Emulsion in oil — light foam (a mixture of oil and antifreeze) appears on the dipstick or oil filler cap.
• 💧 Antifreeze care no external leaks (the level in the expansion tank drops, but there are no puddles under the car).
• ⚡ Unstable engine operation: tripping, loss of power, errors in the oxygen sensor (for example, P0300 - random misfires).
• 🔧 Traces of antifreeze in spark plug wells (when removing the ignition coils, moisture or white deposits are visible).

On Almera N16 with motor QG18DE most often the gasket breaks between the 3rd and 4th cylinders - this is due to the design features of the head. If you ignore the problem, the consequences can be fatal: from water hammer (if antifreeze gets into the cylinder in large quantities) to engine seizure due to loss of lubrication.

⚠️ Attention: If emulsion appears on the dipstick or oil filler cap, stop using the vehicle immediately. Further operation of the engine will lead to accelerated wear of the liners and crankshaft.

Tools and materials for replacement

To replace the cylinder head gasket with Nissan Almera N16 you will need a specialized tool. Without it, the risk of damaging the head or incorrectly tightening the bolts increases significantly. Here's the full list:

Category	Name	Note
Main tool	Torque wrench	Mandatory for tightening cylinder head bolts (range 0–100 Nm)
Main tool	Set of sockets and ratchet wrenches	10, 12, 14 mm (for removing attachments)
Specialized tool	Camshaft fixing device	Necessary to prevent rotation of the shafts when removing sprockets
Consumables	Cylinder head gasket	Original - Nissan 11044-JM00A (for QG16DE/QG18DE)
Consumables	Sealant for gaskets	Recommended Loctite 574 or Permatex Ultra Grey

Additionally you may need:

• 🔧 Micrometer or ruler to check the flatness of the head (tolerance no more than 0.05 mm).
• 🧴 Carburetor Cleaner for removing old sealant and oil from surfaces.
• 🔨 Hammer and wooden spacer for carefully removing the head (if it is “stuck”).

Don’t skimp on the gasket - cheap analogues (for example, from Febi or Ajusa) often become tanned after 30–50 thousand km. Original gasket Nissan 11044-JM00A lasts longer thanks to the multilayer structure (metal + graphite).

Preparing the vehicle and dismantling attachments

Before starting work be sure to drain the antifreeze and oil. To do this:

1. Place the machine on a level surface and jack up the front (or use a rack).
2. Remove the engine protection (if equipped) and place a container under the radiator drain hole.
3. Unscrew the cap on the radiator and cylinder block (14 mm wrench) - the antifreeze will drain out in 10–15 minutes.
4. Drain the oil through the plug on the pan (17 mm wrench).

Next, proceed to dismantling the attachments. Procedure:

1. Remove air filter with housing and intake system pipes.
2. Disconnect accelerator cable and sensor connectors (temperature sensors, mass air flow sensor, temperature sensor).
3. Remove ignition coils and high-voltage wires (label them first!).
4. Unscrew valve cover (8 bolts x 10 mm) and remove it.
5. Dismantle camshaft sprockets, having previously fixed the shafts (use a device or homemade stoppers made of metal plates).

At this stage, many people make a mistake - camshafts do not fix, which causes the timing marks to become misaligned. If this happens, you will have to re-set the valve timing using the marks on the crankshaft pulley and camshaft sprockets.

Antifreeze and oil drained|All pipes and connectors disconnected|Ignition coils and valve cover removed|Camshafts fixed|All bolts and brackets marked-->

Removing the cylinder head

After dismantling the attachment, you can begin to remove the head. Here are the step-by-step instructions:

1. Unscrew 10 cylinder head bolts in the reverse order of tightening (first the outer ones, then the central ones). Use a 12mm socket with extension.
2. Carefully pry the head with a pry bar or wooden spatula. If it doesn’t give in, don’t hit it with a hammer—it’s better to tap it evenly around the perimeter through a wooden spacer.
3. Remove the head and place it on a clean surface (for example, on wooden blocks, so as not to damage the plane).
4. Remove the old gasket from the block and head. Clean the surfaces of sealant residue and carbon deposits using a scraper and carburetor cleaner.

Pay special attention state of the head plane. Even minor deformations (more than 0.05 mm) will lead to repeated puncture of the gasket. Check the flatness using a ruler and feeler gauge:

• Place the ruler with its edge against the plane of the head in several places (diagonally and in the middle).
• Try to insert a 0.05 mm thick feeler gauge between the ruler and the head. If it passes, the head needs to be ground.

On Almera N16 Warping of the head due to overheating is common. If the deformation exceeds 0.1 mm, grinding on a machine will be required (cost ~3–5 thousand rubles). Ignoring this step is the main reason for repeated repairs.

⚠️ Attention: Cylinder head mounting bolts QG16DE/QG18DE — disposable! They need to be replaced with new ones (original article number - Nissan 11026-JM00A). Reusing old bolts may result in breakage or uneven tightening.

Installing a new gasket and assembling

Before installing a new gasket, double check that the surfaces of the block and head are clean. Even small particles of dirt or old sealant can compromise the seal. Assembly order:

1. Apply a thin layer of sealant (Loctite 574) on the gasket from the head side (only on the metal edges around the holes).
2. Install the gasket onto the cylinder block, aligning the guide bushings.
3. Carefully lower the head onto the block and install new mounting bolts.
4. Tighten the bolts to 4 stages using a torque wrench:
   • Stage 1: 20 Nm (pre-tightening).
   • Stage 2: 40 Nm.
   • Stage 3: tighten the bolts 90°.
   • Stage 4: turn it 90° again.

Bolt tightening diagram - from the center to the edges (see picture below). Violation of the order or tightening torques will lead to deformation of the head.

Cylinder head bolt tightening diagram

The 10 bolts are tightened in the following order (numbering faces the front of the engine):

1 → 5 → 3 → 8 → 10 → 2 → 4 → 6 → 7 → 9

First, tighten the central bolts (1, 5, 3, 8), then the outer bolts (10, 2, 4, 6, 7, 9).

After tightening the bolts, install the attachment in the reverse order. Pay special attention to:

• 🔗 Adjusting the timing belt tension (check the labels).
• 🔌 Connecting all connectors (sensors, ignition coils).
• 💧 Refilling the cooling system (use only high quality antifreeze, e.g. Nissan Coolant L248).

Before the first launch be sure to check the compression in cylinders. It must be at least 12 bar (the spread between the cylinders is no more than 1 bar). If compression is low, there may be problems with the valves or piston rings.

First start and check after replacement

Starting the engine for the first time after replacing the cylinder head gasket is a critical step. Do the following:

1. Check that all pipes are connected and the sensors are not shorted.
2. Turn the ignition on for 5-10 seconds (without starting the engine) to allow the fuel pump to build up pressure.
3. Start the engine and immediately check:
   • No oil or antifreeze leaks.
   • Stable operation (no tripping, no extraneous noise).
   • Temperature (the needle should not rise above normal).

During the first 500 km after repair, avoid:

• 🚗 Sharp acceleration and high speeds (more than 3000 rpm).
• 🔥 Long-term idling (more than 10 minutes).
• 💨 Towing or overloading a vehicle.

After 1000 km be sure to check:

• Oil and antifreeze levels.
• Tightening the cylinder head bolts (sometimes it is necessary to tighten them by 30–40°).
• Condition of the spark plugs (are there any traces of antifreeze on them).

⚠️ Attention: If, after replacing the gasket, the engine continues to overheat or an emulsion appears in the oil again, stop using immediately. Possible causes: incorrect bolt tightening, head deformation or defective gasket.

Common mistakes and how to avoid them

Even experienced craftsmen sometimes make mistakes when replacing the cylinder head gasket with Almera N16. Here are the most common:

Error	Consequences	How to avoid
Reuse of cylinder head bolts	Broken bolt or uneven tightening → gasket breakdown	Always install new bolts (Nissan 11026-JM00A)
Incorrect tightening sequence	Head deformation, oil/antifreeze leaks	Follow the pattern: from the center to the edges in 4 stages
Ignoring head flatness check	Repeated gasket breakdown after 5–10 thousand km	Check with a ruler and feeler gauge (tolerance ≤ 0.05 mm)
Saving on gasket (non-original)	Rapid wear, leaks after 30–50 thousand km	Use only Nissan 11044-JM00A

Another common problem is air pockets in the cooling system. They lead to engine overheating even with a good gasket. To avoid this:

• After refilling the antifreeze, remove the pipe from the throttle body and wait until bubble-free liquid comes out of it.
• Warm up the engine with the expansion tank cap open, periodically squeezing the pipes.

If after repair the engine troits or burns Check Engine, check:

• 🔌 Connection of all sensors (especially DPRV and DPKV).
• ⚡ Correct installation of timing marks.
• 🛠️ Compression in the cylinders (perhaps the valves were bent when the timing belt broke).

FAQ: Frequently asked questions about replacing the cylinder head gasket on Almera N16

Is it possible to drive with a broken cylinder head gasket?

No! If the gasket is broken, antifreeze enters the oil or cylinders, which leads to:

• Accelerated wear of liners and crankshaft (due to loss of lubricating properties of the oil).
• Water hammer (if antifreeze gets into the cylinder in large quantities).
• Overheating and head deformation.

The maximum that can be done is to get to the garage or service station in a tow truck or tow truck.

What sealant should I use for the cylinder head gasket?

For Nissan Almera N16 recommended:

• Loctite 574 — high temperature, can withstand up to +300°C.
• Permatex Ultra Grey — universal, suitable for metal gaskets.

Apply a thin layer only to the edges of the gasket (not to the entire surface!). Avoid cheap sealants like Abro - they cannot withstand high temperatures.

Do I need to grind the head after replacing the gasket?

Sanding is required if:

• The head plane is deformed by more than 0.05 mm.
• The engine overheated (even if the head was visually smooth).
• This is not the first time the gasket has broken through.

The cost of grinding is 3-5 thousand rubles, but it is cheaper than repeated repairs after 10 thousand km.

What oil should I fill in after replacing the cylinder head gasket?

For QG16DE/QG18DE Suitable oils with viscosity 5W-30 or 5W-40compliant with the standard API SL/SM or ACEA A3/B4. Recommended brands:

• Nissan Strong Save X 5W-30 (original).
• Mobil 1 ESP 5W-30 (for modern engines).
• Liqui Moly Leichtlauf 5W-40 (universal).

After replacing the gasket, it is better to change the oil completely, as antifreeze particles may remain in it.

How much does it cost to replace a cylinder head gasket at a service center?

Cost of work in services (for 2026):

• Moscow and St. Petersburg: 18–25 thousand rubles.
• Regions: 12–18 thousand rubles.
• On your own: 1.5–3 thousand rubles (cost of gasket and bolts).

The price depends on:

• Need to grind the head.
• Replacement of additional elements (for example, camshaft seals).
• Difficulty in access (on some cars you have to remove the subframe).