Nissan Terrano model r20 series 2004. Instruction — part 51
(2) Align combustion chamber knock pin with cylinder head notch,
and drive in combustion chamber with a soft hammer.
3. Check amount of protrusion of combustion chamber.
Protrusion:
Standard
Less than 0.10 mm (0.0039 in)
VALVE DIMENSIONS
Check dimensions in each valve. For dimensions, refer to SDS.
When valve head has been worn down to 0.5 mm (0.020 in) in
margin thickness, replace the valve.
Grinding allowance for valve stem tip is 0.2 mm (0.008 in) or
less.
VALVE SPRING SQUARENESS
Out-of-square “S”:
Less than 2.0 mm (0.079 in)
VALVE SPRING PRESSURE
Refer to SDS.
SEM634B
SEM188A
SEM635B
EM113
CYLINDER HEAD
TD27Ti
Inspection (Cont’d)
EM-110
VALVE LIFTER AND PUSH ROD
Valve lifter
1. Check valve lifters for excessive wear on the surfaces.
2. Replace with new ones if worn beyond repair.
a. Valve lifter end should be smooth.
b. Valve lifter to lifter hole clearance:
Standard
0.030 - 0.073 mm (0.0012 - 0.0029 in)
Limit
Less than 0.20 mm (0.0079 in)
Valve lifter outer diameter “A”:
Standard
25.960 - 25.970 mm (1.0220 - 1.0224 in)
Cylinder block valve lifter hole diameter “B”:
Standard
26.000 - 26.033 mm (1.0236 - 1.0249 in)
Push rod
1. Inspect push rod for excessive wear on the surfaces.
2. Replace if worn or damaged beyond repair.
3. Check push rod for bend using a dial gauge.
Maximum allowable bend
(Total indicator reading):
Less than 0.5 mm (0.020 in)
ROCKER SHAFT AND ROCKER ARM
1. Check valve rockers, brackets and rocker shafts for scoring,
wear or distortion. Replace if necessary.
SEM636B
CYLINDER HEAD
TD27Ti
Inspection (Cont’d)
EM-111
2. Check clearance between valve rockers and rocker shaft. If
specified clearance is exceeded, replace affected valve rockers
or shaft.
Specified clearance:
Limit
Less than 0.15 mm (0.0059 in)
Rocker shaft outer diameter “A”:
Standard
19.979 - 20.000 mm (0.7866 - 0.7874 in)
Rocker arm inner diameter “B”:
Standard
20.014 - 20.035 mm (0.7880 - 0.7888 in)
3. Check rocker shaft bend at its center. If bend is greater than
specified limit, replace rocker shaft.
Rocker shaft bend
(Total indicator reading):
Limit
Less than 0.3 mm (0.012 in)
MEASURING CYLINDER HEAD TO VALVE DISTANCE
Measure distance from cylinder head surface to intake and exhaust
valves. If specified distance is exceeded, replace valve(s) or valve
seat(s).
Specified distance:
Standard
Intake
0.8 - 1.2 mm
(0.031 - 0.047 in)
Exhaust
0.8 - 1.2 mm
(0.031 - 0.047 in)
Limit
Less than 1.75 mm (0.0689 in)
for intake and exhaust valves
SEM027
SEM028
SEM026
CYLINDER HEAD
TD27Ti
Inspection (Cont’d)
EM-112
Assembly
1. Assemble rocker shaft component parts.
I
Identification of rocker arms
Identification mark
(on rocker arm)
For use with
B
Intake valve
C
Exhaust valve
2. Install valve component parts.
I
Always use new valve oil seal. Refer to “VALVE STEM OIL
SEAL”.
I
Intake and exhaust valve springs are interchangeable.
3. Assemble all removed parts in reverse order of disassembly.
SEM637B
EEM093
CYLINDER HEAD
TD27Ti
EM-113
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