Infiniti Q45. Manual — part 564
CYLINDER HEAD
EM-73
C
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6.
Remove valve oil seal with the valve oil seal puller (SST).
7.
If valve seat must be replaced, refer to
EM-77, "VALVE SEAT REPLACEMENT"
8.
If valve guide must be replaced, refer to
EM-75, "VALVE GUIDE REPLACEMENT"
9.
Remove spark plug tube, as necessary.
●
Using a pair of pliers, pull spark plug tube out of cylinder head.
CAUTION:
●
Take care not to damage cylinder head.
●
Once removed, a spark plug tube will be deformed and cannot be reused. Do not remove it
unless absolutely necessary.
ASSEMBLY
1.
When valve guide is removed, install it. Refer to
EM-75, "VALVE GUIDE REPLACEMENT"
.
2.
When valve seat is removed, install it. Refer to
EM-77, "VALVE SEAT REPLACEMENT"
3.
Install valve oil seal.
●
Apply new engine oil on valve oil seal joint and seal lip.
●
Install with the valve oil seal drift (SST) to match dimension in
figure.
4.
Install valve.
●
Install in the original position.
●
Install larger diameter to intake side.
5.
Install valve spring (with valve spring seat).
●
Install smaller pitch (valve spring seat side) to cylinder head
side.
6.
Install valve spring retainer.
PBIC0072E
PBIC0073E
PBIC0074E
EM-74
CYLINDER HEAD
7.
Install valve collet.
●
Compress valve spring with the valve spring compressor,
attachment and adapter (SST). Install valve collet with mag-
netic hand.
CAUTION:
When working, take care not to damage valve lifter holes.
●
Tap stem edge lightly with plastic hammer after installation to
check its installed condition.
8.
Install valve lifter and adjusting shim.
●
Install in the original position.
9.
Install spark plug tube as follows:
●
Press-fit spark plug tube following procedure below.
a.
Remove old liquid gasket adhering to cylinder head mounting
hole.
b.
Apply liquid gasket to area within approximately 12 mm (0.47 in)
from edge of spark plug tube press-fit side.
●
Use Genuine High strength locking sealant or equivalent.
Refer to
GI-45, "RECOMMENDED CHEMICAL PRODUCTS
.
c.
Using a drift, press-fit spark plug tube so that its height “H” in the
figure is as specified.
CAUTION:
●
When press-fitting spark plug tube, take care not to deform it.
●
After press-fitting, wipe off liquid gasket protruding onto cylinder head upper face.
10. Install spark plug with the spark plug wrench (commercial service tool).
Inspection After Disassembly
NBS001P0
VALVE DIMENSIONS
●
Check dimensions of each valve. For dimensions, refer to
●
If the dimensions are out of the standard, replace valve and
check the valve seat contact. Refer to
PBIC2360E
Standard press-fit height “H”:
38.4 - 39.4 mm (1.512 - 1.551 in)
PBIC2638E
SEM188A
CYLINDER HEAD
EM-75
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VALVE GUIDE CLEARANCE
Valve Stem Diameter
Measure diameter of valve stem with micrometer.
Valve Guide Inner Diameter
Measure inner diameter of valve guide with inside micrometer.
Valve Guide Clearance
(Valve guide clearance) = (Valve guide inner diameter) – (Valve stem diameter).
●
If it exceeds the limit, replace valve and/or valve guide.
VALVE GUIDE REPLACEMENT
When valve guide is removed, replace with oversized [0.2 mm, (0.008 in)] valve guide.
1.
To remove valve guide, heat cylinder head to 110 to 130
°
C (230
to 266
°
F) by soaking in heated oil.
2.
Drive out valve guide with a press [under a 20 kN (2 ton, 2.2 US
ton, 2.0 lmp ton) pressure] or hammer and the valve guide drift
(commercial service tool).
WARNING:
Cylinder head contains heat, when working wear protective
equipment to avoid getting burned.
Standard
Intake
: 5.972 - 5.980 mm (0.2351 - 0.2354 in)
Exhaust
: 5.962 - 5.970 mm (0.2347 - 0.2350 in)
SEM938C
Standard
Intake and Exhaust
: 6.000 - 6.018 mm (0.2362 - 0.2369 in)
Valve guide clearance:
Standard
Intake
: 0.020 - 0.046 mm (0.0008 - 0.0018 in)
Exhaust
: 0.030 - 0.056 mm (0.0012 - 0.0022 in)
Limit
Intake
: 0.08 mm (0.003 in)
Exhaust
: 0.10 mm (0.004 in)
SEM008A
SEM931C
EM-76
CYLINDER HEAD
3.
Using the valve guide reamer (commercial service tool), ream
cylinder head valve guide hole.
4.
Heat cylinder head to 110 to 130
°
C (230 to 266
°
F) by soaking in
heated oil.
5.
Using the valve guide drift (commercial service tool), press valve
guide from the camshaft side to dimensions as in the figure.
WARNING:
Cylinder head contains heat, when working wear protective
equipment to avoid getting burned.
6.
Using the valve guide reamer (commercial service tool), apply
reamer finish to valve guide.
VALVE SEAT CONTACT
●
After confirming that the dimensions of valve guides and valves
are within 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 sur-
face.
●
Check if the contact area band is continuous all around the cir-
cumference.
Valve guide hole diameter (for service parts)
Intake and exhaust:
10.175 - 10.196 mm (0.4006 - 0.4014 in)
SEM932C
SEM008A
PBIC0078E
Standard
Intake and exhaust:
6.000 - 6.018 mm (0.2362 - 0.2369 in)
SEM932C
SBIA0322E
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