Cylinder head — removal and installation (Nissan Serena C24)

Preparatory work

(for details, see the section "Preparatory work" in the relevant sections)

Drain the coolant, remove the intercooler, valve cover, vacuum pump, cylinder head rear cover assembly, high pressure fuel pipes, drain pipe, fuel injector assemblies, secondary timing chain, camshafts, catalytic converter, exhaust manifold, turbocharger and intake manifold.

Removal and installation the cylinder head

Removal

Loosen the mounting bolts in the reverse order shown in the illustration.

Note: Since glow plugs protrude from the bottom of the cylinder head, remove the cylinder head so as not to damage the glow plugs. You can install the cylinder head by placing a board underneath it.

Installation

1. Tighten the installation bolts in the order shown in the figure as follows.

(1) Lubricate the threaded parts and the seating surface of the mounting bolts with engine oil.

(2) Tighten the bolts to 28.4-38.2 Nm (2.9-3.9 kg·m).

(3) Tighten the bolts 180-185° (standard 180°).

(4) Loosen the bolts to 0 Nm (0 kg·m).

Note: Loosen the bolts according to item (4) in the reverse order to that shown in the figure.

(5) Tighten the bolts to 34.3-44.1 Nm (3.5-4.5 kg·m).

(6) Tighten to 90-95° (standard 90°).

(7) Tighten again to 90-95° (standard 90°).

Attention: Determine the bolt rotation angle in accordance with point 2. Do not estimate the tightening angle "by eye".

Installing the cylinder head (determination of the tightening angle)

Tighten the bolts to a certain angle as follows. (Point 1, pp. (3), (6), (7)).

Tightening at an angle using a protractor

The tightening angle is determined by the marks applied to the cylinder head and bolt heads.

Tightening with a protractor wrench

The tightening angle is determined using the scale of the protractor wrench.

Installing the cylinder head

Apply Tree Bond 1207C sealant in a continuous bead (KR510 00150) to the areas shown in the figure.





Pay special attention when applying sealant to the following areas.

• A: Apply the sealant so that it does not squeeze out into the oil channel.
• B: Apply minimal sealant beading at the junction of the start and end of the bead. The area marked with * is on the outside and is not visible after the engine is assembled.

Selecting a cylinder head gasket

Select the gasket as follows.

In case of gasket replacement

Install a gasket of the same thickness.



The gaskets are marked by thickness using notches and a hole on the right rear side of the gasket.

Note: The indicated gasket thickness is obtained after tightening the cylinder head mounting bolts.

The thickness of the gasket can be determined before removing the cylinder head using the above notches and hole.

In case of repair and replacement of parts

When grinding the top surface of the cylinder block, grinding the main or connecting rod journals of the crankshaft, select the gasket in the following order.

(1) Set the piston to the TDC position.

(2) Install the indicator in the places shown in the figure, slowly turn the crankshaft, set the indicator to zero reading at maximum piston lift.

(3) Move the indicator stand, place the indicator on the cylinder block and read the reading.

(4) Measure each cylinder at two points, select the maximum piston protrusion value and select the required gasket according to the table.

Note: The indicated gasket thickness is obtained after tightening the cylinder head mounting bolts.

Removal and installation glow plugs

Attention:

Do not remove the spark plugs unnecessarily, as they may break.

Check the spark plugs for conductivity when installed.

Do not damage the spark plugs (if you dropped the candle from a height of more than 10 cm, replace it).

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Installation

Install the glow plugs after removing any carbon deposits in the mounting holes using a reamer.

Installing the coolant temperature sensor and temperature gauge sensor

Before installing the sensors, apply Three Bond 1386B sealant to the threaded areas.

Examination

Checking for deformation (stretching) cylinder head mounting bolts

Using a micrometer, measure the diameters d ₁, d ₂ of the threaded section of the bolt.

If it is possible to determine the narrowed area, then measure the diameter d at this place.

Calculate the difference between d ₁ and d ₂.

• Limit difference: 0.15 mm

Checking the levels between the cylinder head and the cylinder block

After installing the cylinder head, measure the distance between the front surface of the cylinder block and the front surface of the cylinder head.

• Standard distance: 23.8+0.27 mm

If the distance is different from the standard, please re-install.