Nissan Frontier D22. Instruction — part 701
CYLINDER HEAD
EM-111
[VG33E and VG33ER]
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CAMSHAFT JOURNAL CLEARANCE
1.
Measure the outer diameter of the camshaft journal.
2.
Measure the inner diameter of the camshaft bearing for the cor-
responding camshaft journal positions measured in step 1.
3.
The camshaft journal is the difference between the outer diameter of the camshaft journal and the inner
diameter of the camshaft bearing. If the clearance exceeds the limit, replace camshaft and/or cylinder
head.
CAMSHAFT END PLAY
1.
Install the camshaft and the locate plate in the cylinder head.
2.
Measure the camshaft end play.
3.
If it is out of the specified range, select thickness of camshaft
locate plate to obtain standard specified end play.
Example:
When camshaft end play is 0.08 mm (0.0031 in) with camshaft
locate plate 1 replace camshaft locate plate 1 with camshaft
locate plate 4 to set the end play at 0.04 mm (0.0016 in).
CAMSHAFT SPROCKET RUNOUT
1.
Support the camshaft at the No. 2 and No. 4 camshaft journals.
2.
Install the sprocket on the camshaft.
Standard outer camshaft journal diameter
A
: 46.920 - 46.940 mm (1.8472 - 1.8480 in)
B
: 42.420 - 42.440 mm (1.6701 - 1.6709 in)
C
: 47.920 - 47.940 mm (1.8866 - 1.8874 in)
SEM893BA
Standard inner camshaft bearing diameter
A
: 47.000 - 47.025 mm (1.8504 - 1.8514 in)
B
: 42.500 - 42.525 mm (1.6732 - 1.6742 in)
C
: 48.000 - 48.025 mm (1.8898 - 1.8907 in)
SEM879A
Camshaft journal clearance limit
: 0.15 mm (0.0059 in)
Standard camshaft end play
: 0.03 - 0.06 mm
(0.0012 - 0.0024 in)
SEM392E
WEM081
EM-112
[VG33E and VG33ER]
CYLINDER HEAD
3.
Measure the camshaft sprocket runout.
4.
If the runout exceeds the limit, replace the camshaft sprocket.
VALVE GUIDE CLEARANCE
1.
Measure the valve deflection at a right-angled direction to the
camshaft. The valve and valve guide mostly wear in that direc-
tion.
2.
If the valve guide deflection exceeds the limit, check the valve to
valve guide clearance.
a.
Measure valve stem diameter and valve guide inner diameter as
shown.
b.
Check that the valve to valve guide clearance is within specifica-
tion.
c.
If the valve to valve guide clearance exceeds the limit, replace
the valve or valve guide as necessary.
Runout limit (total indicator
reading)
: 0.1 mm (0.004 in)
SEM872B
Valve deflection limit
(dial gauge reading)
: 0.20 mm (0.0079 in)
SEM263A
Valve to valve guide clearance
Intake
: 0.020 - 0.053 mm (0.0008 - 0.0021 in)
Exhaust
: 0.030 - 0.049 mm (0.0012 - 0.0019 in)
Limit
: 0.10 mm (0.0039 in)
SEM751A
CYLINDER HEAD
EM-113
[VG33E and VG33ER]
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VALVE GUIDE REPLACEMENT
1.
To remove the valve guide, heat cylinder head to 150
° - 160°C
(302
° - 320°F) by soaking it in heated oil.
2.
Drive out the valve guide using a press with a pressure limited to
under 20 kN (2 ton, 2.2 US ton, 2.0 Imp ton) of pressure, or a
hammer and suitable tool.
3.
Ream out the cylinder head valve guide hole to specification for
the service valve guide part as shown.
4.
Heat the cylinder head to 150
° - 160°C (302° - 320°F) in heated
oil and press the service valve guide into the cylinder head to
the specified height as shown.
5.
Ream out the new service valve guide in the cylinder head to the
specified diameter.
SEM008A
SEM264A
Valve guide hole diameter (for service parts)
Intake
: 11.175 - 11.196 mm (0.4400 - 0.4408 in)
Exhaust
: 12.175 - 12.196 mm (0.4793 - 0.4802 in)
Height “L”
: 13.2 - 13.4 mm (0.520 - 0.528 in)
SEM088C
SEM089C
Valve guide finished inner diameter
Intake
: 7.000 - 7.018 mm (0.2756 - 0.2763 in)
Exhaust
: 8.000 - 8.011 mm (0.3150 - 0.3154 in)
SEM088C
EM-114
[VG33E and VG33ER]
CYLINDER HEAD
VALVE SEATS
Check the valve seats for any pitting at the valve contact surface,
and re-surface or replace the valve seat if it has worn out.
●
Before repairing the valve seats, check the valve and valve
guide for wear. Refer to
●
Use both hands to cut the valve seat uniformly.
REPLACING VALVE SEAT FOR SERVICE PARTS
1.
Bore out the old seat until it collapses. The machine depth stop should be set so that the boring cannot
continue beyond the bottom of the face of the valve seat recess in the cylinder head.
2.
Ream out the cylinder head recess.
CAUTION:
Reaming should be done in circles concentric to the valve guide center so that valve seat will have
the correct fit.
3.
Heat the cylinder head to 150
° - 160°C (302° - 320°F) by soak-
ing it in heated oil.
4.
Press fit the valve seat into the cylinder head until it seats on the bottom of the valve seat bore.
5.
Cut or grind the valve seat using a suitable tool to specification.
6.
After cutting, lap the valve seat with an abrasive compound.
7.
Check the valve seating dimensions.
SEM090C
Reaming bore for service valve seat
Oversize
: 0.5 mm (0.020 in)
Intake
: 44.500 - 44.516 mm (1.7520 - 1.7526 in)
Exhaust
: 37.500 - 37.516 mm (1.4764 - 1.4770 in)
SEM795A
SEM008A
Valve
Intake
Exhaust
Seat face angle “
α” degrees
45
°
45
°
Contacting width “W”
mm (in)
1.75 (0.0689)
1.7 (0.067)
SEM892B
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