Infiniti EX35. Manual — part 728
CYLINDER HEAD
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< DISASSEMBLY AND ASSEMBLY >
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a.
Remove old locking sealant 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"
c.
Using 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.
15. Install spark plug with spark plug wrench (commercial service tool).
16. Install in the reverse order of removal after this step.
Inspection
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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
B
: High strength thread locking sealant application
area
Standard press-fit height:
: 37.7 - 38.7 mm (1.484 - 1.524 in)
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Limit [(C) - (B)]
: 0.18 mm (0.0071 in)
A
: Measuring point
e
: 48 mm (1.89 in)
d
: 11 mm (0.43 in)
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Limit
: Refer to
.
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< DISASSEMBLY AND ASSEMBLY >
CYLINDER HEAD
• 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)
• If the calculated value exceeds the limit, replace valve and/or valve guide. When valve guide must be
replaced, refer to
EM-104, "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” (B) conditions even after the recheck,
replace valve seat. Refer to
EM-104, "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)
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A
: OK
JPBIA0187ZZ
B
: Contact
Limit
: Refer to
.
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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-10, "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:
*: Transmission/transaxle/CVT fluid, 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
Other oils and fluid*
Level
Leakage
Level
Fuel
Leakage
Leakage
Leakage
Exhaust gases
—
Leakage
—
EM-114
< DISASSEMBLY AND ASSEMBLY >
CYLINDER BLOCK
CYLINDER BLOCK
Exploded View
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1.
Sub harness
2.
Knock sensor
3.
Crankshaft position sensor
4.
Cylinder block heater (for Canada)
5.
Cylinder block
6.
Thrust bearing
7.
Main bearing (upper)
8.
Crankshaft
9.
Crankshaft key
10. Main bearing (lower)
11. O-ring
12. Lower cylinder block bolt
13. Baffle plate
14. Lower cylinder block
15. Pilot converter
16. Reinforcement plate
17. Drive plate
18. Rear oil seal
19. Oil jet
20. Top ring
21. Second ring
22. Oil ring
23. Piston
24. Piston pin
25. Snap ring
26. Connecting rod
27. Connecting rod bearing
28. Connecting rod bearing cap
29. Connecting rod bolt
A.
Refer to
B.
Chamfered
C.
Front mark
JPBIA1827GB
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