Nissan Qashqai J11. Manual — part 97
CYLINDER HEAD
EM-327
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6.
Push the valve stem seal past the tool barrel, then withdraw the
barrel.
7.
Place the guide tube plus push rod assembly on the valve stem
seal.
8.
Push the valve stem seal down by tapping the top of the sleeve
with the palm of your hand until the guide tube touches the cylin-
der head.
9.
Repeat these operations for all the valves.
10. Install the valve springs and valve spring retainers using valve
spring compressor.
11. Install the valve collets using tweezers.
12. Install in the reverse order of removal after this step.
Cleaning
INFOID:0000000010282102
• It is very important not to scratch the gasket faces of any aluminum components.
• Use suitable tool to dissolve any part of the seal which remains stuck to the metal surface.
• Apply the dissolving product to the part to be cleaned, wait approximately 10 minutes, then remove it using a
wooden spatula.
• Wear gloves while carrying out this operation.
• Do not allow this dissolving product to drip on to the paintwork.
• Great care should be taken when performing this operation, to prevent foreign objects from entering
the pipes taking oil under pressure to the camshafts (pipes in both the cylinder head and its cover)
and the oil return pipes.
MBIB0424E
MBIB0425E
MBIB0416E
EM-328
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CYLINDER HEAD
• Failure to follow these instructions could lead to the blocking of the oilways, resulting in rapid and
serious damage to the engine.
Inspection
INFOID:0000000010282103
INSPECTION AFTER REMOVAL
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:
Use utmost care not to 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 and feeler gauge.
• If it exceeds the limit, replace cylinder head.
Cylinder Head Height
Measure the height of cylinder head (H).
Valve protrusion
Check the valve protrusion using dial gauge stand set [KV113B0040
(Mot.251-01) (commercial service tool) or equivalent tool] and dial
gauge stand set [KV113B0050 (Mot.252-01) (commercial service
tool) or equivalent tool] as shown.
INSPECTION AFTER DISASSEMBLY
Valve
Measure the valves as follows.
• Stem diameter (d)
• Face angle (
α
)
Limit
: Refer to
.
Standard
: Refer to
.
E1BIA0063ZZ
Standard
:
−
0.07 to 0.07 mm (
−
0.0028 to 0.0028 in)
MBIB0426E
Intake
: Refer to
Exhaust
Intake
: Refer to
Exhaust
E1BIA0064ZZ
CYLINDER HEAD
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• Head diameter (D)
• Valve length (L)
• Valve margin (T)
Valve Seat
Measure the valve seats as follows.
• Seat angle (
α
)
• Contacting width (X)
• Seat outer diameter (D):
• Cylinder head seat recess diameter (D)
Valve Guide Clearance
1.
Measure diameter of valve stem with micrometer.
2.
Measure inner diameter of valve guide with inside micrometer.
3.
Calculate the valve guide clearance.
(Valve guide clearance) = (Valve guide inner diameter) – (Valve
stem diameter)
• If it exceeds the limit, replace and/or valve guide.
Valve Spring
Intake
: Refer to
Exhaust
: Refer to
Intake
: Refer to
Exhaust
: Refer to
Intake
: Refer to
Exhaust
: Refer to
Intake
: Refer to
Exhaust
: Refer to
Intake
: Refer to
Exhaust
: Refer to
Intake
: Refer to
Exhaust
: Refer to
Intake
: Refer to
Exhaust
: Refer to
E1BIA0066ZZ
Intake
: 0.020 - 0.050 mm (0.0008 - 0.0020 in)
Exhaust
: 0.030 - 0.063 mm (0.0012 - 0.0025 in)
SEM938C
EM-330
< UNIT DISASSEMBLY AND ASSEMBLY >
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CYLINDER HEAD
Measure the valve spring as follows.
• Free height
• Length under load
• Full pressed height
• Wire diameter
• Inner diameter
• Outer diameter
• Squareness
Intake and exhaust
: Refer to
Intake and exhaust
: Refer to
Intake and exhaust
: Refer to
Intake and exhaust
: Refer to
Intake and exhaust
: Refer to
Intake and exhaust
: Refer to
Intake and exhaust
: Refer to
SEM113
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