Nissan Frontier D40. Manual — part 584
EM-68
< ON-VEHICLE REPAIR >
[QR25DE]
CYLINDER HEAD
5.
Remove valve oil seal using Tool.
6.
When valve seat must be replaced, refer to
EM-69, "Inspection After Disassembly"
.
7.
When valve guide must be replaced, refer to
EM-69, "Inspection After Disassembly"
8.
Remove spark plug tube, if necessary.
• Remove it from cylinder head using suitable tool.
CAUTION:
• Be careful not to damage cylinder head.
• Once removed, spark plug tube will be deformed and cannot be reused. Do not remove it
unless absolutely necessary.
ASSEMBLY
1.
Install valve guide if removed. Refer to
EM-69, "Inspection After Disassembly"
2.
Install valve seat if removed. Refer to
EM-69, "Inspection After Disassembly"
3.
Install valve oil seal using Tool.
NOTE:
Install with the valve oil seal to match dimension as shown.
4.
Install valve.
NOTE:
Install larger diameter to intake side.
5.
Install valve spring (with valve spring seat).
NOTE:
• Install smaller pitch (valve spring seat side) to cylinder head
side.
• Confirm identification color of valve spring.
6.
Install valve spring retainer.
7.
Install valve collet using Tool.
Tool numbers
: KV10115600 (J-38958)
WBIA0478E
Tool numbers
: KV10115600 (J-38958)
Height (H)
: 11.8 - 12.4 mm (0.465 - 0.488 in)
WBIA0653E
Intake
: Pink
Exhaust
: Green
PBIC0525E
Tool numbers
: KV10116200 (J-26336-A)
: KV10115900 (J-26336-20)
CYLINDER HEAD
EM-69
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• Install valve collet with a magnet hand.
CAUTION:
When working, be careful not to damage valve lifter holes.
• Tap valve stem edge lightly with a plastic hammer after instal-
lation to check its installed condition.
8.
Install valve lifter.
• Install it in the original position.
9.
Install spark plug tube if removed.
• Press-fit it into cylinder head as follows:
a.
Remove old sealant from cylinder head side installation hole.
b.
Apply sealant 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-22, "Recommended Chemical Products and
c.
Press-fit spark plug tube so that its height (H) is as specified
using suitable tool.
CAUTION:
• When press-fitting, be careful not to deform spark plug tube.
• After press-fitting, wipe off any protruding sealant on top surface of cylinder head.
10. Install spark plug.
Inspection After Disassembly
INFOID:0000000005274294
VALVE DIMENSIONS
• Check dimensions of each valve. For dimensions, refer to
• If dimensions are out of the standard, replace valve and check the
valve seat contact.
VALVE GUIDE CLEARANCE
Valve Stem Diameter
WBIA0578E
Standard press-fit
height (H)
: 41.2 - 42.2 mm (1.622 - 1.661 in)
PBIC2713E
SEM188A
EM-70
< ON-VEHICLE REPAIR >
[QR25DE]
CYLINDER HEAD
Measure the diameter of valve stem with micrometer.
Valve Guide Inner Diameter
Measure the 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 guide and/or valve.
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) force] or suitable tool.
WARNING:
Cylinder head contains heat, when working, wear protective
equipment to avoid getting burned.
Standard
Intake
: 5.965 - 5.980 mm (0.2348 - 0.2354 in)
Exhaust
: 5.955 - 5.970 mm (0.2344 - 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 - 0.053 mm (0.0008 - 0.0021 in)
Exhaust
: 0.030 - 0.063 mm (0.0012 - 0.0025 in)
Limit
Intake
: 0.08 mm (0.003 in)
Exhaust
: 0.09 mm (0.004 in)
SEM008A
SEM931C
CYLINDER HEAD
EM-71
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3.
Ream cylinder head valve guide hole using suitable tool.
4.
Heat cylinder head to 110
°
to 130
°
C (230
°
to 266
°
F) by soaking
in heated oil.
5.
Press valve guide from camshaft side to the dimensions as
shown using suitable tool.
WARNING:
Cylinder head contains heat, when working, wear protective
equipment to avoid getting burned.
6.
Apply reamer finish to valve guide using suitable tool.
VALVE SEAT CONTACT
Valve guide hole diameter (for service parts):
Intake and exhaust
: 10.175 - 10.196 mm (0.4006 - 0.4014 in)
SEM932C
SEM008A
Projection (H)
Intake
: 10.1 - 10.3 mm (0.398 - 0.406 in)
Exhaust
: 10.0 - 10.4 mm (0.394 - 0.409 in)
PBIC2187E
Standard
Intake and exhaust:
6.000 - 6.018 mm (0.2362 - 0.2369 in)
SEM932C
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