Nissan Qashqai J11. Manual — part 34
CYLINDER HEAD
EM-75
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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
• 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
A
: Straightedge
B
: Feeler gauge
Limit
.
PBIC3207J
Standard
: Refer to
Standard
: Refer to
Standard and Limit
: Refer to
PBIC3213J
A
: OK
JPBIA0187ZZ
EM-76
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[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.
B
: Contact
Limit
: Refer to
PBIC3219J
Standard
: Refer to
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
Leakage
Leakage
Exhaust gases
—
Leakage
—
CAMSHAFT
EM-77
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CAMSHAFT
Exploded View
INFOID:0000000010282231
Removal and Installation
INFOID:0000000010282232
CAUTION:
The rotation direction indicated in the text indicates all directions seen from the engine front direction.
REMOVAL
1.
Remove timing belt. Refer to
EM-59, "Removal and Installation"
2.
Remove cylinder head closing plate with the following procedure.
a.
Remove cylinder head closing plate bolts. Refer to
1.
Exhaust and intake camshaft bear-
ing cap guide
2.
Exhaust and intake camshaft
bearing cap (timing chain side)
3.
Camshaft bearing cap (center)
4.
Exhaust camshaft bearing cap
(gearbox side)
5.
Intake camshaft bearing cap
(gearbox side)
6.
Exhaust camshaft
7.
Intake camshaft
8.
Cylinder head closing plate
9.
Cylinder head
A.
Tightening must be done following the installation procedure.
Refer to
E1BIA1017GB
EM-78
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[HRA2DDT]
CAMSHAFT
b.
Separate cylinder head closing plate from cylinder head using a
flatblade screw driver (1).
CAUTION:
• Be careful not to damage the matting surface.
c.
Remove cylinder head closing plate.
3.
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
a.
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.
4.
Remove exhaust 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
a.
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.
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