2011 INFINITI QX56 Factory Service Manual

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Page 2649 of 5598

INFINITI QX56 2011 Factory Service Manual
CYLINDER HEADEM-87
< REMOVAL AND INSTALLATION >
C
DE
F
G H
I
J
K L
M A
EM
NP
O
NOTE:
As for replacement of parts on the intake side as
shown in the exploded view, replace VVEL ladder assem-
bly &

Page 2650 of 5598

INFINITI QX56 2011 Factory Service Manual
EM-88
< REMOVAL AND INSTALLATION >
CYLINDER HEAD
2. Install new cylinder head gaskets.
3. Install cylinder head as per the following: CAUTION:
If cylinder head bolts are re-used, check their ou ter

Page 2651 of 5598

INFINITI QX56 2011 Factory Service Manual
CYLINDER HEADEM-89
< REMOVAL AND INSTALLATION >
C
DE
F
G H
I
J
K L
M A
EM
NP
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Disassembly and AssemblyINFOID:0000000006365632
DISASSEMBLY
1. Remove valve collet.
Compress valve spring with the val

Page 2652 of 5598

INFINITI QX56 2011 Factory Service Manual
EM-90
< REMOVAL AND INSTALLATION >
CYLINDER HEAD
b. Drive out valve guide (EXH) with a press [under a 20 kN (2 ton,2.2 US ton, 2.0 lmp ton) pressure] or a hammer and the valve
guide drift (commercial

Page 2653 of 5598

INFINITI QX56 2011 Factory Service Manual
CYLINDER HEADEM-91
< REMOVAL AND INSTALLATION >
C
DE
F
G H
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K L
M A
EM
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d. Using the valve guide reamer (commercial service tool) (A),
apply reamer finish to valve guide (EXH).
2. Install valv

Page 2654 of 5598

INFINITI QX56 2011 Factory Service Manual
EM-92
< REMOVAL AND INSTALLATION >
CYLINDER HEAD
a. Apply new engine oil on new valve oil seal joint and seal lip.
b. Using the valve oil seal drift [SST: KV10115600 (J-38958)] (A),press fit valve se

Page 2655 of 5598

INFINITI QX56 2011 Factory Service Manual
CYLINDER HEADEM-93
< REMOVAL AND INSTALLATION >
C
DE
F
G H
I
J
K L
M A
EM
NP
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Cylinder Head Distortion
NOTE:
When performing this inspection, cylinder block distortion should be also checked. Refer

CYLINDER HEADEM-93
< REMOVAL AND INSTALLATION >
C
DE
F
G H
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K L
M A
EM
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Cylinder Head Distortion
NOTE:
When performing this inspection, cylinder block distortion should be also checked. Refer to
EM-115, "
Inspec-
tion".
1. Using a scraper, wipe out oil, scale, gasket, s ealant 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 directi ons (A), (B), (C), (D), (E), and
(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 valv e. For the dimensions, refer to EM-135, "CylinderHead".
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 EM-86, "
Exploded View". (Intake side)
NOTE:
Since the valve (INT) cannot be replaced by the pi ece, 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 EM-86, "
Exploded View". (Exhaust side)
- Replace VVEL ladder assembly & cylinder head assembly. Refer to EM-86, "
Exploded View". (Intake side)
NOTE:
Since the valve (INT) and valve guide (INT) cannot be repl aced 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 surfac e of valve seat to check the condition of the valve
contact on the surface. Limit : Refer to
EM-135, "
CylinderHead".
JPBIA0176ZZ
Standard : Refer to EM-135, "CylinderHead".
Standard : Refer to EM-135, "
CylinderHead".
Standard : Refer to EM-135, "
CylinderHead".
JPBIA0183ZZ
Revision: 2010 May2011 QX56

Page 2656 of 5598

INFINITI QX56 2011 Factory Service Manual
EM-94
< REMOVAL AND INSTALLATION >
CYLINDER HEAD
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 contacti

EM-94
< REMOVAL AND INSTALLATION >
CYLINDER HEAD
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 EM-86, "
Exploded View". (Exhaust
side)
- If not, replace VVEL ladder assembly & cylinder head assembly. Refer to EM-86, "
Exploded View". (Intake side)
NOTE:
Since the valve seat (INT) cannot be replaced by t he piece, VVEL ladder assembly & cylinder head assem-
bly replacement are required.
Valve Spring (with valve spring seat) Squareness
Set a try square (A) along the side of valve spring (with valve
spring seat) and rotate spring. Measure the maximum clearance
between the top of spring and try square.
If it exceeds the limit.
- Replace valve spring (with valve spring seat) (EXH). Refer to EM-
86, "Exploded View". (Exhaust side)
- Replace VVEL ladder assembly & cylinder head assembly. Refer
to EM-86, "
Exploded View". (Intake side)
NOTE:
Since the valve spring (with valve spring seat) (INT) c annot 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 (with valve spring seat) pressure at speci- fied spring height.
If the installation load or load with valve open is out of the stan- dard.
- Replace valve spring (with valve spring seat) (EXH). Refer to EM-
86, "Exploded View". (Exhaust side)
- Replace VVEL ladder assembly & cylinder head assembly. Refer to EM-86, "
Exploded View". (Intake side)
NOTE:
Since the valve spring (with valve spring seat) (INT) c annot be replaced by the piece, VVEL ladder assembly
& cylinder head assembly replacement are required.
INSPECTION AFTER ASSEMBLY
Inspection for Leakage
The following are procedures for checking fluid leakage, lubricant leakage.
Before starting engine, check oil/fluid levels includi ng 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 engi ne stopped). With fuel pressure applied to fuel piping,
check for fuel leakage at connection points.
- Start engine. With engine speed increased, che ck again for fuel leakage at connection points.
Run engine to check for unusual noise and vibration. NOTE:
A: OK
B: NG
JPBIA0187ZZ
B : Contact
Limit : Refer to EM-135, "CylinderHead".
JPBIA0189ZZ
Standard
: Refer to EM-135, "
CylinderHead".
SEM113
Revision: 2010 May2011 QX56

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