Nissan Terrano r20e. Manual — part 286
Inspection
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When the camshaft or parts in connection with valves are
removed or replaced, and a fault has occurred (poor starting,
idling, or other faults) due to the misadjustment of the valve
clearance, inspect as follows.
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Inspect and adjust when the engine is cool (at normal tempera-
ture).
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Be careful of the intake and exhaust valve arrangement. (The
valve arrangement is different from that in a normal engine.)
(The camshafts have, alternately, either an intake valve or an
exhaust valve.)
1. Remove the following parts.
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Intercooler cover
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Intercooler
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Rocker cover
2. Set the No. 1 cylinder at TDC.
1) Rotate the crankshaft pulley clockwise, and align the TDC mark
of the crankshaft pulley with the timing indicator of the TDC
sensor bracket.
2) Confirm that the cam nose of the No. 1 cylinder and the knock
pin of the cam sprocket is in the position shown in the figure.
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Rotate the crankshaft pulley again if not in the position shown
in the figure.
3. While referring to the figure, measure the valve clearance in the
circled area of the table below.
Measuring point
No. 1
No. 2
No. 3
No. 4
INT
EXH
INT
EXH
INT
EXH
INT
EXH
When the No. 1
cylinder is in the
TDC
q
q
q
q
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The injection order is 1-3-4-2.
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Measure the valve clearance using a JIS high grade feeler
gauge when the engine is cool (at normal temperature).
Standard:
Intake and exhaust
0.35±0.05 mm (0.0138±0.0020 in)
4. Set the No. 4 cylinder at TDC by rotating the crankshaft clock-
wise once.
FEM010
SEM342G
FEM024
FEM025
FEM026
VALVE CLEARANCE INSPECTIONS AND ADJUSTMENTS
ZD
EM-35
5. While referring to the figure, measure the valve clearance in the
circled area of the table below.
Measuring point
No. 1
No. 2
No. 3
No. 4
INT
EXH
INT
EXH
INT
EXH
INT
EXH
When the No. 4
cylinder is in the
TDC
q
q
q
q
6. If the valve clearance is outside the specification, adjust as fol-
lows.
Adjustments
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Remove the adjusting shim for parts which are outside the
specified valve clearance.
1. Remove the spill tube.
2. Extract the engine oil on the upper side of the cylinder head (for
the air gun used in step 7).
3. Rotate the crankshaft to face the cam for adjusting shims that
are to be removed upward.
4. Grip the camshaft with camshaft pliers (SST), the using the
camshaft as a support point, push the adjusting shim downward
to compress the valve spring.
CAUTION:
Do not damage the camshaft, cylinder head, or the outer cir-
cumference of the valve lifter.
5. With the valve spring in a compressed state, remove the cam-
shaft pliers (SST) by securely setting the outer circumference
of the valve lifter with the end of the lifter stopper (SST).
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Hold the lifter stopper by hand until the shim is removed.
CAUTION:
Do not retrieve the camshaft pliers forcefully, as the camshaft
will be damaged.
6. Move the rounded hole of the adjusting shim to the front with a
very thin screwdriver.
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When the adjusting shim on the valve lifter will not rotate
smoothly, restart from step 4 with the end of the lifter stopper
(SST) touching the adjusting shim.
7. Remove the adjusting shim from the valve lifter by blowing air
through the rounded hole of the shim with an air gun.
CAUTION:
To prevent any remaining oil from being blown around, thor-
oughly wipe the area clean and wear protective goggles.
FEM027
FEM028
FEM029
FEM030
VALVE CLEARANCE INSPECTIONS AND ADJUSTMENTS
ZD
Inspection (Cont’d)
EM-36
8. Remove the adjusting shim by using a magnetic hand.
9. Measure the thickness of the adjusting shim using a microme-
ter.
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Measure near the center of the shim (the part that touches the
cam).
10. Select the new adjusting shim from the following methods.
Calculation method of the adjusting shim thickness:
t = t
1
+ (C
1
− C
2
)
t = Adjusting shim thickness
t
1
= Thickness of the removed shim
C
1
= Measured valve clearance
C
2
= Specified valve clearance
[when the engine is cool (at normal temperature)]
0.35 mm (0.0138 in)
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New adjusting shims have the thickness stamped on the rear
side.
Stamped
Shim thickness
mm (in)
2.35
2.40
.
.
.
3.05
2.35 (0.0925)
2.40 (0.0945)
.
.
.
3.05 (0.1201)
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The thickness of the adjusting shim ranges from 2.35 to 3.05
mm (0.0925 to 0.1201 in), where in the space of 0.05 mm
(0.0020 in). There are 15 types of shims available.
11. Fix the selected adjusting shim to the valve lifter.
CAUTION:
Place the stamped side of the adjusting shim to the valve lifter.
12. Compress the valve spring using the camshaft pliers and
remove the lifter stopper (SST).
13. Rotate the crankshaft 2 to 3 times by hand.
14. Confirm that the valve clearance is within the specification.
FEM031
FEM032
FEM033
VALVE CLEARANCE INSPECTIONS AND ADJUSTMENTS
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Adjustments (Cont’d)
EM-37
Removal and Installation
2 idler gears are shown in this chapter. Idler gear (A) has scissors gear, and idler gear (B) does not.
YEM029
TIMING GEAR
ZD
EM-38
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