Nissan Qashqai J11. Manual — part 69
CYLINDER HEAD
EM-215
< UNIT DISASSEMBLY AND ASSEMBLY >
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• Fit the attachment [SST: KV10115900 (J-26336-20)]
in
thecenter of valve spring retainer
to press it.
• Tap valve stem edge lightly with a plastic hammer after instal-
lation to check its installed condition.
8.
Install valve lifter.
• Install it in the original position.
9.
Install spark plug with spark plug wrench (commercial service tool).
Inspection
INFOID:0000000010715511
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 checked. 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 water.
2.
At each of several locations on bottom surface of cylinder head,
measure the distortion in six directions using straightedge (A)
and feeler gauge (B).
• 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
JPBIA4477ZZ
Limit [(d1) – (d2)]: 0.15 mm (0.0059 in)
PBIC3994E
Limit: Refer to
JSBIA2474ZZ
EM-216
< UNIT DISASSEMBLY AND ASSEMBLY >
[MR20DD]
CYLINDER HEAD
Valve Stem Diameter
• Measure the diameter of valve stem with micrometer (B).
Valve Guide Inner Diameter
• Measure the inner diameter of valve guide with bore gauge (A).
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
EM-210, "Disassembly and Assembly"
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 recheck, replace
valve seat. Refer to
EM-210, "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 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).
Standard and Limit: Refer to
JSBIA2475ZZ
: OK
JPBIA0187ZZ
: Contact
C
: V-block
Limit
: Refer to
JSBIA4163ZZ
Standard
: Refer to
SEM113
CYLINDER HEAD
EM-217
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INSPECTION AFTER INSTALLATION
Inspection for Leakage
The following are procedures for checking fluids leakage, lubricates leakage, and exhaust gases leakage.
• 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.
• 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.
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
—
E M - 2 1 8
< UNIT DISASSEMBLY AND ASSEMBLY >
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OIL PAN (UPPER)
OIL PAN (UPPER)
Exploded View
INFOID:0000000010715512
Removal and Installation
INFOID:0000000010715513
REMOVAL
1.
Remove oil pan (lower). Refer to
2.
Remove oil filter. Refer to
LU-25, "Removal and Installation"
3.
Remove water hoses of oil cooler.
4.
Remove oil level gauge and oil level gauge guide.
5.
Remove front cover, timing chain, balancer unit timing chain, and other related parts. Refer to
Rear oil seal
O-ring
Oil pan (upper)
Drain plug
Drain plug washer
Oil pan (lower)
O-ring
Oil level gauge guide
Oil level gauge
To oil cooler
Oil pan (lower) side
: Oil pan side
: Always replace after every disassembly.
: N·m (kg-m, ft-lb)
: Should be lubricated with oil.
: Sealing point
JPBIA6893GB
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