Nissan Murano. Instruction — part 636
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< UNIT DISASSEMBLY AND ASSEMBLY >
CYLINDER HEAD
a.
Apply new engine oil on valve oil seal joint and seal lip.
b.
Install with the valve oil seal drift [SST: KV10115600 (J-38958)]
(A) press fit valve seal to height (b) shown in the figure.
NOTE:
Dimension: Height measured before valve spring seat installa-
tion.
4.
Install valve spring seat.
5.
Install valve.
• Install it in the original position.
NOTE:
Larger diameter valves are for intake side.
6.
Install valve spring (uneven pitch type).
• Install narrow pitch end (paint mark) to cylinder head side
(valve spring seat side).
7.
Install valve spring retainer.
8.
Install valve collet.
• Compress valve spring with the valve spring compressor [SST:
KV10116200 (J-26336-A)] (A), the attachment [SST:
KV10115900 (J-26336-20)] (C) and the adapter [SST:
KV10109220 ( — )] (B). Install valve collet with a magnet
hand.
CAUTION:
When working, take care not to damage valve lifter holes.
• Tap valve stem edge lightly with plastic hammer after installa-
tion to check its installed condition.
9.
Install valve lifter.
• Install it in the original position.
10. Install spark plug tube.
• Press-fit spark plug tube as follows:
a.
Remove old liquid gasket adhering to cylinder head mounting hole.
b.
Apply sealant to area within approximately 12 mm (0.47 in) from edge of spark plug tube press-fit side.
Use genuine high strength thread locking sealant or equivalent. Refer to
Chemical Products and Sealants"
.
Intake and exhaust
: 14.3 - 14.9 mm (0.563 - 0.587 in)
JPBIA0178ZZ
A
: Wide pitch
B
: Narrow pitch
C
: Paint mark
: Cylinder head side
Paint mark color: Blue
JPBIA0179ZZ
JPBIA0180ZZ
CYLINDER HEAD
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< UNIT DISASSEMBLY AND ASSEMBLY >
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c.
Using a drift, press-fit spark plug tube so that its height (A) is as
specified in the figure.
CAUTION:
• When press-fitting, take care not to deform spark plug
tube.
• After press-fitting, wipe off liquid gasket protruding onto
cylinder-head upper face.
11. Install spark plug with the spark plug wrench (commercial service tool).
Inspection
INFOID:0000000009718005
INSPECTION AFTER REMOVAL
Cylinder Head Bolts Outer Diameter
• Cylinder head bolts are tightened by plastic zone tightening
method. Whenever the size difference between (C) and (B)
exceeds the limit, replace them with new one.
• If reduction of outer diameter appears in a position other than (B),
use it as (B) point.
Cylinder Head Distortion
NOTE:
When performing this inspection, cylinder block distortion should be also checking. Refer to
.
1.
Using a scraper, wipe off oil, scale, gasket, sealant and carbon deposits from surface of cylinder head.
CAUTION:
Never allow gasket fragments to enter engine oil or engine coolant passages.
2.
At each of several locations on bottom surface of cylinder head,
measure the distortion in six directions (A), (B), (C), (D), (E), and
(F).
• 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 Con-
tact”.
Valve Guide Clearance
Valve Stem Diameter
B
: Genuine high strength thread locking sealant application area
Standard press-fit height: 37.7 - 38.7 mm (1.484 - 1.524 in)
JPBIA0181ZZ
A
: Measuring point
d
: 11 mm (0.43 in)
e
: 48 mm (1.89 in)
Limit [(C) - (B)]
: 0.11 mm (0.0043 in)
JPBIA0173ZZ
Limit
: Refer to
.
JPBIA0176ZZ
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< UNIT DISASSEMBLY AND ASSEMBLY >
CYLINDER HEAD
• 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
EM-115, "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 circumference.
• If not, grind to adjust valve fitting and check again. If the contacting
surface still has “NG” conditions (B) even after the recheck,
replace valve seat. Refer to
EM-115, "Disassembly and Assem-
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
Standard
: Refer to
.
(Intake and exhaust)
Standard
: Refer to
.
(Intake and exhaust)
Valve guide clearance
: Refer to
.
Standard and limit (Intake and exhaust)
JPBIA0183ZZ
A
: OK
JPBIA0187ZZ
B
: Contact
Limit
: Refer to
.
JPBIA0189ZZ
CYLINDER HEAD
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• 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 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-15, "FOR NORTH AMERICA : Fluids and Lubricants"
(for
North America) or
MA-16, "FOR MEXICO : 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.
Standard (Intake and exhaust)
: Refer to
.
Free height
Installation height
Installation load
Height during valve open
Load with valve open
SEM113
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
—
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