Nissan Qashqai (2007-2010). Manual — part 33
EM-80
< ON-VEHICLE REPAIR >
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CYLINDER HEAD
• Compress valve spring with the valve spring compressor, the
attachment and the adapter [SST: KV10116200] (A). Install
valve collet with a magnet hand (B).
CAUTION:
Be careful not to damage valve lifter holes.
• Tap valve stem edge lightly with a plastic hammer after instal-
lation to check its installed condition.
9.
Install valve lifter.
10. Install spark plug with a spark plug wrench (commercial service tool).
Inspection
INFOID:0000000000943692
INSPECTION AFTER REMOVAL
Cylinder Head Bolts Outer Diameter
• Cylinder head bolts are tightened by plastic zone tightening
method. Whenever the size difference between “d1” and “d2”
exceeds the limit, replace them with a new one.
• If reduction of outer diameter appears in a position other than “d2”,
use it as “d2” point.
Cylinder Head Distortion
NOTE:
When performing this inspection, cylinder block distortion should be also checking. Refer to
.
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 engine coolant.
2.
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
• 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
PBIC3727E
Limit (“d1”–“d2”): 0.15 mm (0.0059 in)
PBIC3717E
A
: Straightedge
B
: Feeler gauge
Limit
: Refer to
PBIC3207J
CYLINDER HEAD
EM-81
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• 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 the calculated value exceeds the limit, replace valve and/or valve guide. When valve guide must be
replaced, refer to “VALVE GUIDE REPLACEMENT”.
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.
• If not, grind to adjust valve fitting and check again. If the contacting
surface still has “NG” conditions even after the re-check, replace
valve seat. Refer to
EM-76, "Disassembly and Assembly"
Valve Spring Squareness
• 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 the valve spring pressure at specified spring height.
• If the installation load or load with valve open is out of the stan-
dard, replace valve spring.
INSPECTION AFTER INSTALLATION
Inspection for Leaks
• 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-21, "Fluids and Lubricants"
.
Standard
: Refer to
.
Standard
Standard and Limit
: Refer to
.
PBIC3213J
A
: OK
B
: NG
JPBIA0187ZZ
B
: Contact
Limit
: Refer to
PBIC3219J
Standard
: Refer to
.
SEM113
EM-82
< ON-VEHICLE REPAIR >
[HR16DE]
CYLINDER HEAD
• 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.
• Warm up engine thoroughly to make sure there is no leakage of fuel, exhaust gases, or any oil/fluids includ-
ing 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:
*: Transmission/transaxle/CVT fluid, power steering fluid, brake fluid, etc.
Items
Before starting engine
Engine running
After engine stopped
Engine coolant
Level
Leakage
Level
Engine oil
Level
Leakage
Level
Other oils and fluid*
Level
Leakage
Level
Fuel
Leakage
Leakage
Leakage
Exhaust gases
—
Leakage
—
ENGINE ASSEMBLY
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REMOVAL AND INSTALLATION
ENGINE ASSEMBLY
Exploded View
INFOID:0000000000893871
Removal and Installation
INFOID:0000000000894026
WARNING:
• Situate the vehicle on a flat and solid surface.
• Place chocks at front and back of rear wheels.
• Attach proper slingers and bolts described in PARTS CATALOG if engine slingers are not equipped.
CAUTION:
• Always be careful to work safely, avoid forceful or uninstructed operations.
• Never start working until exhaust system and coolant are cool enough.
• If items or work required are not covered by the engine section, refer to the applicable sections.
• Always use the support point specified for lifting.
1.
Engine mounting insulator (RH)
2.
Engine mounting bracket (RH)
3.
Engine mounting stay
4.
Rear engine mounting bracket
5.
Rear engine mounting bracket
6.
Rear torque rod
7.
Engine mounting bracket (LH)
8.
Engine mounting bracket (LH)
9.
Engine mounting insulator (LH)
Refer to
for symbols in the figure.
JPBIA0279GB
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