Removing the cylinder head on a Nissan Almera: complete analysis with photos and advice from experts

Introduction: when is cylinder head removal required and what awaits you

Dismantling cylinder heads (cylinder head) on Nissan Almera - a task encountered when overhauling an engine, replacing a gasket, repairing valves or eliminating an oil leak. This procedure requires not only precision, but also an understanding of the design. QG-series engines (QG15DE, QG16DE, QG18DE) with which the models were equipped N16, G15 And B10.

It is important to consider that Almera Classic (B10) and Almera N16 the process is nuanced due to differences in attachment layout. For example, on N16 with an air conditioner, you will have to additionally dismantle the compressor, and on B10 — combat limited access to the rear cylinder head bolts. On QG18DE engines (1.8 l), the tightening torque of the cylinder head bolts is 98–108 Nm, while on the QG15DE it is 90–95 Nm - an error here will lead to deformation of the gasket or cracks in the head.

If you have never worked with gas distribution mechanism (GRM), it is better to entrust the task to specialists: incorrect installation of phases or misalignment of the cylinder head during tightening will cost tens of thousands of rubles in repairs. This article contains step-by-step instructions with photos, a list of tools and critical momentsthat even experienced craftsmen miss.

Preparation: tools and working conditions

Before removing the cylinder head, make sure you have everything you need. You will have to work in a garage with a pit or on a lift - access to the lower head mounting bolts from the ground is extremely inconvenient. Here is a complete list of tools and materials:

• 🔧 Set of sockets and sockets (necessarily with an extension for the rear bolts)
• 🔧 Torque wrench (error no more than ±2 Nm)
• 🔧 10 and 12 mm hexagons (for drain plugs and brackets)
• 🔧 Screwdrivers with flat and Phillips blades (for clamps and sensors)
• 🛠️ Puller for valve springs (if you plan to disassemble the cylinder head)
• 🛠️ Sealant for gaskets (for example, Loctite 574 or ABRO 11-AB)
• 📦 New cylinder head gasket (original Nissan 11044-JM00A or equivalent Elring 443.220)
• 🧴 Carburetor cleaner (to remove carbon deposits from valves)

Also prepare:

• 📸 Camera or phone - record the location of all pipes and connectors.
• 📝 Marker and tape - for marking wires and hoses.
• 🧤 Nitrile coated gloves - protection against oil and antifreeze.

⚠️ Attention: If the engine Almera was overheated before repair, check the head for cracks using flaw detection paints (For example, Loctite 7271). Microcracks in the area of ​​the combustion chambers or cooling channels lead to repeated burnout of the gasket.

Draining liquids and dismantling attachments

The first stage is draining all technical fluids. Let's start with antifreeze:

1. Place the machine on a level surface and remove the crankcase protection (if equipped).
2. Place a container with a volume of at least 8 liters under the radiator drain hole (bottom right).
3. Unscrew the plug on the radiator and cylinder block (10 mm hexagon).
4. After draining the antifreeze, unscrew the expansion tank and set it aside.

Next, drain the oil:

• 🔧 Unscrew the plug on the pallet (17 mm wrench) and drain the oil into a separate container.
• 🔧 Remove the oil filter - it will interfere when dismantling the pan (if necessary).

Now we begin to dismantle the attachments. On Nissan Almera N16 the procedure is as follows:

Pay special attention timing belt:

• 🔧 Fix the crankshaft and camshafts in the TDC position (the marks on the pulleys must match).
• 🔧 Remove the belt by first loosening the tension roller (14 mm wrench).
• 🔧 Do not turn the shafts after removing the belt — this will disrupt the valve timing.

⚠️ Attention: On Almera Classic (B10) Before removing the cylinder head, be sure to disconnect the brake booster tube from the intake manifold. If this is not done, when dismantling the manifold, the plastic fitting on the amplifier may be damaged.

Removing the valve cover and camshafts

After removing the attachments, we begin disassembling the upper part of the engine. Let's start with the valve cover:

1. Unscrew the 12 bolts securing the cover (10 mm head).
2. Remove the cover and remove any remaining sealant from its surface with a solvent.
3. Check the condition of the camshaft seals - if they are “skinny” or leaking, replace them (Nissan 13270-4M000).

Next, remove the camshafts. To do this:

• 🔧 Unscrew the bolts securing the camshaft beds (12 mm head) in the reverse order of tightening (from the edges to the center).
• 🔧 Carefully remove the shafts, after first removing the timing gears.
• 🔧 Place the shafts on a clean surface, avoiding scratches on the necks.

At this stage you can assess the condition hydraulic compensators (if your model has them). If the compensators are “jammed” or have play, it is better to replace them (Nissan 13201-4M000 for QG16DE). Also inspect the camshaft cams for wear - scuffs or chips indicate the need to grind or replace the shaft.

How to check camshafts for wear without a micrometer

Rotate the shaft in bed by hand - if you feel beating or play, this is a sign of wear. Also inspect the cams: there should be no “burrs” or discoloration on the working surface (blue discoloration indicates overheating).

Unscrewing the cylinder head bolts: order and nuances

This is the most critical stage. Cylinder head bolts on Nissan Almera are tightened with great force, and unscrewing them requires care. Use only 12 mm hex head with an extension - an open-end wrench or a head with worn edges will tear off the splines.

The order of unscrewing the bolts (for QG16DE):

1. First loosen the bolts 1/2 turn in the reverse order of tightening (see diagram below).
2. Unscrew the bolts completely, starting from the center ones and moving towards the edges.
3. Remove the bolts and inspect them for deformation or corrosion. Cylinder head bolts are disposable! When reinstalling, use new ones (Nissan 11026-4M000).

Bolt number	Tightening torque (Nm)	Tightening order	Notes
1–10	49–59 (first stage)	From the center to the edges	Use a torque wrench
1–10	90–95 (second stage)	Same order	For QG15DE
1–10	98–108 (second stage)	Same order	For QG18DE
—	Check after 1000 km	All bolts	Extend if necessary

Critical error: Many craftsmen try to unscrew the bolts a full turn at once. This leads to head deformation, since the pressure on it is distributed unevenly. Always loosen the bolts 180° first and then remove them completely.

Removing the cylinder head and inspecting surfaces

After unscrewing the bolts, carefully lift the cylinder head. If it is “stuck”, do not try to tear it off - use a wooden block and a rubber mallet, tapping the edges. When the head moves, remove it and place it on a clean surface. combustion chambers up (this will prevent dirt from getting into the channels).

Now check:

• 🔍 Cylinder block surface — there should be no scoring, corrosion or remnants of the old gasket.
• 🔍 Cylinder head gasket — burnouts, cracks or squeezed out oil indicate the cause of the malfunction.
• 🔍 Valves and seats — carbon deposits on the valve plates or erosion of the seats require repair.

Clean the surface of the block and head from gasket residues plastic scraper (metal leaves scratches). To remove carbon deposits from valves, use carburetor cleaner and a brush with soft bristles. If there are deep marks on the surface of the block, it will have to be ground (the maximum permissible deviation from flatness is 0.05 mm).

⚠️ Attention: On engines QG18DE after 2005, heads were installed in the channels valve stem seals new type (Nissan 13202-4M025). If you disassemble the cylinder head, replace them all - even one worn cap will lead to oil leakage after 10-15 thousand km.

Common mistakes and how to avoid them

Even experienced craftsmen make mistakes when working with cylinder head Nissan Almera. Here are the most common:

• 🔧 Head misalignment when tightening - occurs if the bolts are not tightened according to the diagram or without a torque wrench. Consequences: oil leak, gasket burnout.
• 🔧 Reusing old bolts - they stretch when tightened and do not provide the required force. Always take new ones!
• 🔧 Incorrect tightening torque - on QG16DE the second stage of tightening should be exactly 90–95 Nm, and not “by eye”.
• 🔧 Forgetting to mark the bolt threads — before installation, clean the holes in the block from oil and antifreeze with compressed air.

Another typical problem is incorrect gasket installation. She should lie down on absolutely dry and clean surface. If there are traces of sealant left on the block or head, the gasket will not press tightly, and after 1–2 thousand km it will begin to leak oil or antifreeze.

On Almera N16 with QG18DE people often forget about crankcase ventilation tubewhich is attached to the valve cover. If you do not disconnect it, when removing the cylinder head, you can tear the pipe or break the plastic fitting.

FAQ: answers to frequently asked questions

Is it possible to remove the cylinder head on an Almera without removing the engine?

Yes, but it is extremely inconvenient. On N16 you will have to dismantle the subframe and engine mounts, and B10 - remove the front panel. It is better to hang the engine on hoists or use a hoist.

What sealant should I use for the cylinder head gasket?

For Nissan Almera fit Loctite 574 (high temperature) or ABRO 11-AB. Apply a thin layer only to the joints of the block and head, avoiding getting into the channels. The gasket itself does not require sealant!

What to do if the cylinder head bolt breaks inside the block?

You will have to drill out the bolt and cut a new thread. To do this:

1. Drill the center of the broken bolt.
2. Drill a hole with a drill with a diameter 1 mm smaller than the thread.
3. Use a tap to cut new threads (M10×1.25 for QG-series).
4. Install a repair bolt with an enlarged head.

If you are not confident in your abilities, contact a turner.

How much does it cost to remove the cylinder head at a service center?

The cost of work depends on the region and model:

• Almera Classic (B10): 8–12 thousand rubles.
• Almera N16: 10–15 thousand rubles. (due to difficulties with attachments).

If head grinding is required, add another 3–5 thousand rubles.

How to check that the cylinder head is installed correctly?

After assembly:

1. Start the engine and check for oil or antifreeze leaks.
2. Listen to the operation at idle - there should be no extraneous noise (the knocking of hydraulic compensators is acceptable for the first 5-10 minutes).
3. Check the compression in all cylinders (should be 12–14 bar, variation no more than 1 bar).