Nissan Qashqai J11. Manual - part 126

CYLINDER HEAD

EM-443

< UNIT DISASSEMBLY AND ASSEMBLY >

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• Compress valve spring with a valve spring compressor (com-

mercial service tool) (A).

• Tap valve stem edge lightly with a plastic hammer after instal-

lation to check its installed condition.

6.

Install hydraulic tappet.
• Check that the tappets are filled with oil before refitting them.

7.

Install cylinder head gasket with the following procedure:

CAUTION:

Before installing cylinder head, inspect piston protrusion.

a.

Apply liquid gasket to position (A) shown in the figure.

Use Genuine Liquid Gasket or equivalent.

b.

Install cylinder head gasket (1), and apply liquid gasket to posi-
tion (A) shown in the figure.

Use Genuine Liquid Gasket or equivalent.

8.

Install cylinder head, and tighten mounting bolts in numerical
order as shown in figure with the following procedure:

a.

Tighten all bolts.

b.

Tighten all bolts.

JPBIA0643ZZ

: Engine front

JPBIA0612ZZ

: Engine front

JPBIA0611ZZ

: Engine front

: 5.0 N·m (0.51 kg-m, 44 in-lb)

: 30.0 N·m (3.1 kg-m, 22 ft-lb)

E1BIA0661ZZ

EM-444

< UNIT DISASSEMBLY AND ASSEMBLY >

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CYLINDER HEAD

c.

Turn all bolts 300 degrees clockwise (angle tightening).

CAUTION:

Check and confirm the tightening angle by using an angle
wrench [SST: KV10112100 ( — )] (A) or protractor. Never
judge by visual inspection without the tool.

9.

Assemble in the reverse order of disassembly, for the rest of parts. 

Inspection

INFOID:0000000010282023

INSPECTION AFTER DISASSEMBLY

Cylinder Head Distortion

NOTE:
When performing this inspection, cylinder block distortion should be also checked.
1.

Wipe off engine oil and remove water scale (like deposit), gasket, sealant, carbon, etc. with a scraper.

CAUTION:

Never allow gasket debris to enter passages for engine oil or water.

2.

At each of several locations on bottom surface of cylinder head,
measure the distortion in six directions (A - F).

• If it exceeds the standard, replace cylinder head and cylinder

head housing.

NOTE:
Cylinder head cannot be replaced as a single part, because it is
machined together with cylinder head housing. Replace whole
cylinder head housing and cylinder head assembly.

VALVE DIMENSIONS

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

EM-473, "Cylinder Head"

.

• If dimensions are out of the standard, replace valve and check 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)

• If it exceeds the standard, replace valve and/or cylinder head and cylinder head housing.

VALVE SEAT CONTACT

JPBIA0867ZZ

Standard: Refer to 

EM-473, "Cylinder Head"

.

JPBIA0176ZZ

Standard

: Refer to 

EM-473, "Cylinder Head"

.

Standard

: Refer to 

EM-473, "Cylinder Head"

.

Standard : 

Refer 

to 

EM-473, "Cylinder Head"

.

JPBIA0183ZZ

CYLINDER HEAD

EM-445

< UNIT DISASSEMBLY AND ASSEMBLY >

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• 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.

• If not, grind to adjust valve fitting and check again. If the contacting

surface still has “NG” conditions even after the re-check, replace
cylinder head and cylinder head housing.

VALVE SPRING DIMENSIONS AND VALVE SPRING PRESSURE LOAD

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

specified spring height.

• If the pressure height is out of the standard, replace valve spring.

A

:  OK

B

:  NG

JPBIA0187ZZ

Standard

: Refer to 

EM-473, "Cylinder Head"

.

SEM113

EM-446

< UNIT DISASSEMBLY AND ASSEMBLY >

[R9M]

CYLINDER BLOCK

CYLINDER BLOCK

Exploded View

INFOID:0000000010282024

1.

Centring dowe

2.

Cylinder block

3.

TDC hole plug

4.

Scraper ring

5.

Sealing ring

6.

Compression ring

7.

Gudgeon pin locking spring ring

8.

Piston

9.

Con rod

E1BIA1216GB