Nissan Frontier. Instruction — part 720
CYLINDER HEAD
EM-69
< REMOVAL AND INSTALLATION >
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• Measure the tightening angle using Tool.
3. Installation of the remaining parts is in reverse order of removal.
INSPECTION AFTER INSTALLATION
• 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-16, "FOR USA AND CANADA : Fluids and Lubricants"
(United
States and Canada).
• 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.
NOTE:
If hydraulic pressure inside timing chain tensioner drops after removal and installation, slack in the guide
may generate a pounding noise during and just after engine start. However, this is normal. Noise will stop
after hydraulic pressure rises.
• Warm up engine thoroughly to make sure there is no leakage of fuel, exhaust gas, or any oils/fluids including
engine oil and engine coolant.
• Bleed air from passages in lines and hoses, such as in cooling system.
• After cooling down engine, again check oil/fluid levels including engine oil and engine coolant. Refill to spec-
ified level, if necessary.
• Summary of the inspection items:
*Power steering fluid, brake fluid, etc.
Tool number
: KV10112100 (BT-8653-A)
Step a
: 55.0 N·m (5.6 kg-m, 41 ft-lb)
Step b
: Loosen to 0 N·m in the reverse order of
tightening.
Step c
: 39.2 N·m (4.0 kg-m, 29 ft-lb)
Step d
: 75
° clockwise
Step e
: 75
° clockwise
WBIA0617E
Item
Before starting engine
Engine running
After engine stopped
Engine coolant
Level
Leakage
Level
Engine oil
Level
Leakage
Level
Transmission/
transaxle fluid
A/T and CVT Models
Leakage
Level/Leakage
Leakage
M/T Models
Level/Leakage
Leakage
Level/Leakage
Other oils and fluids*
Level
Leakage
Level
Fuel
Leakage
Leakage
Leakage
Exhaust gas
—
Leakage
—
EM-70
< REMOVAL AND INSTALLATION >
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CYLINDER HEAD
Exploded View
INFOID:0000000009478073
Disassembly and Assembly
INFOID:0000000009478074
DISASSEMBLY
1. Remove spark plug.
2. Remove valve lifter.
• Identify installation positions, and store them without mixing them up.
3. Remove valve collet, valve spring retainer and valve spring
using Tool.
CAUTION:
• When working, be careful not to damage valve lifter holes.
• Do not remove valve spring seat from valve spring.
4. Push valve stem to combustion chamber side, and remove valve.
• Identify installation positions, and store them without mixing them up.
1.
Valve collet
2.
Valve spring retainer
3.
Valve spring (with valve spring seat)
4.
Valve oil seal
5.
Valve guide
6.
Cylinder head
7.
Valve seat
8.
Valve (INT)
9.
Valve (EXH)
10. Spark plug tube
11. Spark plug
PBIC3024E
Tool numbers
: KV10116200 (J-26336-A)
: KV10115900 (J-26336-20)
: KV10109220 ( — )
WBIA0477E
CYLINDER HEAD
EM-71
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5. Remove valve oil seal using Tool.
6. When valve seat must be replaced. Refer to
EM-72, "Inspection After Disassembly"
.
7. When valve guide must be replaced. Refer to
EM-72, "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-72, "Inspection After Disassembly"
.
2. Install valve seat if removed. Refer to
EM-72, "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
: Blue
Exhaust
: Yellow
PBIC0525E
Tool numbers
: KV10116200 (J-26336-A)
: KV10115900 (J-26336-20)
: KV10109220 ( — )
EM-72
< REMOVAL AND INSTALLATION >
[QR25DE]
CYLINDER HEAD
• 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.
GI-21, "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:0000000009478075
VALVE DIMENSIONS
• Check dimensions of each valve. 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
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