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Nissan Qashqai J11. Manual - part 34

CYLINDER HEAD

EM-75

< UNIT DISASSEMBLY AND ASSEMBLY >

[HRA2DDT]

At each of several locations on bottom surface of cylinder head,
measure the distortion in six directions.

• If it exceeds the limit, replace cylinder head.

INSPECTION AFTER DISASSEMBLY

VALVE DIMENSIONS

• Check the dimensions of each valve. For the dimensions, refer to

EM-116, "Cylinder Head"

• If dimensions are out of the standard, replace valve and check valve seat contact. Refer to “VALVE SEAT

CONTACT”.

VALVE GUIDE CLEARANCE

Valve Stem Diameter

• Measure the diameter of valve stem with micrometer (A).

Valve Guide Inner Diameter

• Measure the inner diameter of valve guide with bore gauge.

Valve Guide Clearance

• (Valve guide clearance) = (Valve guide inner diameter) – (Valve

stem diameter)

VALVE SEAT CONTACT

• After confirming that the dimensions of valve guides and valves are within the specifications, perform this

procedure.

• Apply prussian blue (or white lead) onto contacting surface of valve seat to check the condition of the valve

contact on the surface.

• Check if the contact area band is continuous all around the circum-

ference.

VALVE SPRING SQUARENESS

: Straightedge

: Feeler gauge

Limit

: Refer to

EM-116, "Cylinder Head"

PBIC3207J

Standard

: Refer to

EM-116, "Cylinder Head"

Standard

: Refer to

EM-116, "Cylinder Head"

Standard and Limit

: Refer to

EM-116, "Cylinder

Head"

PBIC3213J

: OK

JPBIA0187ZZ

EM-76

< UNIT DISASSEMBLY AND ASSEMBLY >

[HRA2DDT]

CYLINDER HEAD

• Set a try square (A) along the side of valve spring and rotate

spring. Measure the maximum clearance between the top of spring
and try square.

• If it exceeds the limit, replace valve spring.

VALVE SPRING DIMENSIONS AND VALVE SPRING PRESSURE LOAD

• Check valve spring pressure with valve spring seat installed at the

specified spring height.

CAUTION:

Never remove valve spring seat from valve spring.

• If the installation load or load with valve open is out of the stan-

dard, replace valve spring (with valve spring seat).

INSPECTION AFTER INSTALLATION

Inspection for Leaks

The following are procedures for checking fluids leak, lubricates leak and exhaust gases leak.

• Before starting engine, check oil/fluid levels including engine coolant and engine oil. If less than required

quantity, fill to the specified level. Refer to

MA-59, "Fluids and Lubricants"

• Use procedure below to check for fuel leakage.
- Turn ignition switch ON (with engine stopped). With fuel pressure applied to fuel piping, check for fuel leak-

age at connection points.

- Start engine. With engine speed increased, check again for fuel leakage at connection points.
• Run engine to check for unusual noise and vibration.

NOTE:
If hydraulic pressure inside timing chain tensioner drops after removal/installation, slack in the guide may
generate a pounding noise during and just after engine start. However, this is normal. Noise will stop after
hydraulic pressure rises.

• Warm up engine thoroughly to check there is no leakage of fuel, exhaust gases, or any oil/fluids including

engine oil and engine coolant.

• Bleed air from lines and hoses of applicable lines, such as in cooling system.
• After cooling down engine, again check oil/fluid levels including engine oil and engine coolant. Refill to the

specified level, if necessary.

Summary of the inspection items:

*: Power steering fluid, brake fluid, etc.

: Contact

Limit

: Refer to

EM-116, "Cylinder Head"

PBIC3219J

Standard

: Refer to

EM-116, "Cylinder Head"

INSPECTION

Items

Before starting engine

Engine running

After engine stopped

Engine coolant

Level

Leakage

Level

Engine oil

Level

Leakage

Level

Transmission /
transaxle fluid

AT & CVT Models

Leakage

Level / Leakage

Leakage

MT Models

Level / Leakage

Leakage

Level / Leakage

Other oils and fluids*

Level

Leakage

Level

Fuel

Leakage

Exhaust gases

—

Leakage

—

CAMSHAFT

EM-77

< UNIT DISASSEMBLY AND ASSEMBLY >

[HRA2DDT]

CAMSHAFT

Exploded View

INFOID:0000000010282231

Refer to

GI-4, "Components"

for symbols in the figure.

Removal and Installation

INFOID:0000000010282232

CAUTION:

The rotation direction indicated in the text indicates all directions seen from the engine front direction.

REMOVAL

Remove timing belt. Refer to

EM-59, "Removal and Installation"

Remove cylinder head closing plate with the following procedure.

Remove cylinder head closing plate bolts. Refer to

EM-77, "Exploded View"

Exhaust and intake camshaft bear-
ing cap guide

Exhaust and intake camshaft
bearing cap (timing chain side)

Camshaft bearing cap (center)

Exhaust camshaft bearing cap
(gearbox side)

Intake camshaft bearing cap
(gearbox side)

Exhaust camshaft

Intake camshaft

Cylinder head closing plate

Cylinder head

Tightening must be done following the installation procedure.
Refer to

EM-77

E1BIA1017GB

EM-78

< UNIT DISASSEMBLY AND ASSEMBLY >

[HRA2DDT]

CAMSHAFT

Separate cylinder head closing plate from cylinder head using a
flatblade screw driver (1).

CAUTION:

• Be careful not to damage the matting surface.

Remove cylinder head closing plate.

Remove intake camshaft sprocket with the following procedure.

CAUTION:

• It is strictly forbidden to apply any pressure to oil pan.
• Damage oil pan will irreparably damage the engine by:
- blocking the strainer
- Raising oil level above maximum, with a risk of engine racing

Remove intake camshaft sprocket bolt.
• Hold intake camshaft using open end spanner (1)
• Loosen the bolts in several steps, and then remove them.
• Remove intake camshaft sprocket.

Remove exhaust camshaft sprocket with the following procedure.

CAUTION:

Remove exhaust camshaft sprocket bolt.
• Hold exhaust camshaft using open end spanner (1)
• Loosen the bolts in several steps, and then remove them.
• Remove exhaust camshaft sprocket.

E1BIA1091ZZ

E1BIA1060ZZ

E1BIA1061ZZ

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