Infiniti G37 Coupe. Manual — part 633
CYLINDER HEAD
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2.
At each of several locations on bottom surface of cylinder head,
measure the distortion in six directions (A - F).
• If it exceeds the limit, replace VVEL ladder assembly & cylinder
head assembly.
NOTE:
Cylinder head assembly cannot be replaced as a single part,
because it is machined together with VVEL ladder assembly.
Valve Dimensions
• Check the dimensions of each valve. For the dimensions, refer to
.
• If dimensions are out of the standard.
- Replace valve (EXH) and check valve seat contact. Refer to "VALVE SEAT CONTACT". (Exhaust side)
- Replace VVEL ladder assembly & cylinder head assembly. Refer to
. (Intake side)
NOTE:
Since the valve (INT) cannot be replaced by the piece, VVEL ladder assembly & cylinder head assembly
replacement are required.
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 (EXH) and/or valve guide (EXH). Refer to
- Replace VVEL ladder assembly & cylinder head assembly. Refer to
. (Intake side)
NOTE:
Since the valve (INT) and valve guide (INT) cannot be replaced by the piece, VVEL ladder assembly & cylin-
der head assembly replacement are required.
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 re-check, replace
valve seat (EXH). Refer to
side)
- If not, replace VVEL ladder assembly & cylinder head assembly.
. (Intake side)
Limit
: Refer to
.
JPBIA0176ZZ
Standard :
.
Standard
: Refer to
Standard
: Refer to
JPBIA0183ZZ
A
: OK
B
: NG
JPBIA0187ZZ
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< DISASSEMBLY AND ASSEMBLY >
CYLINDER HEAD
NOTE:
Since the valve seat (INT) cannot be replaced by the piece, VVEL ladder assembly & cylinder head assem-
bly replacement are required.
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 (EXH). Refer to
.
(Exhaust side)
- Replace VVEL ladder assembly & cylinder head assembly. Refer
. (Intake side)
NOTE:
Since the valve spring (INT) cannot be replaced by the piece, VVEL ladder assembly & cylinder head
assembly replacement are required.
Valve Spring Dimensions and Valve Spring Pressure Load
• 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 (EXH). Refer to
.
(Exhaust side)
- Replace VVEL ladder assembly & cylinder head assembly. Refer
. (Intake side)
NOTE:
Since the valve spring (INT) cannot be replaced by the piece, VVEL ladder assembly & cylinder head
assembly replacement are required.
INSPECTION AFTER INSTALLATION
Inspection for Leakage
The following are procedures for checking fluid leakage, lubricant leakage.
• Before starting engine, check oil/fluid levels including engine coolant and engine oil. If any are less than the
required quantity, fill them to the specified level. Refer to
MA-10, "Fluids and Lubricants"
.
• Follow the procedure below to check for fuel leakage.
- Turn ignition switch to the “ON” position (with engine stopped). With fuel pressure applied to fuel piping,
check for fuel leakage 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 chain tensioner drops after removal/installation, slack in guide may generate a
pounding noise during and just after the engine start. However, this does not indicate a malfunction. The
noise will stop after hydraulic pressure rises.
• Warm up engine thoroughly to check that there is no leakage of fuel, 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 them to
the specified level, if necessary.
Summary of the inspection items:
Limit
: Refer to
.
B
: Contact
JPBIA0189ZZ
Standard
: Refer to
SEM113
Items
Before starting engine
Engine running
After engine stopped
Engine coolant
Level
Leakage
Level
CYLINDER HEAD
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* Transmission/transaxle/CVT fluid, power steering fluid, brake fluid, etc.
Engine oil
Level
Leakage
Level
Other oils and fluids*
Level
Leakage
Level
Fuel
Leakage
Leakage
Leakage
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CYLINDER BLOCK
CYLINDER BLOCK
Exploded View
INFOID:0000000001547565
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 (A/T models)
Pilot bush (M/T models)
16. Reinforcement plate (A/T models)
17. Drive plate (A/T models)
18. Rear oil seal
19. Flywheel (M/T models)
20. Oil jet
21. Top ring
22. Second ring
23. Oil ring
24. Piston
25. Piston pin
26. Snap ring
27. Connecting rod
28. Connecting rod bearing
29. Connecting rod bearing cap
30. Connecting rod bolt
JPBIA1351GB
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