NISSAN TEANA 2008 Service Manual

EM-16
< ON-VEHICLE MAINTENANCE >
SPARK PLUG
6. Remove spark plug with a spark plug wrench (commercial ser-
vice tool).
INSTALLATION
Installation is the reverse order of removal.
InspectionINFOID:0000000003802243
INSPECTION AFTER REMOVAL
Use the standard type spark plug for normal condition.
CAUTION:
 Never drop or shock spark plug.
 Never use a wire brush for cleaning.
 If plug tip is covered with carbon, spark plug cleaner may be
used.
 Spark plug gap adjustment is not required between replace-
ment intervals.
 Measure spark plug gap. When it exceeds the limit, replace
spark plug even if it is within the specified replacement mile-
age. Refer to EM-136, "
Spark Plug".
a : 14 mm (0.55 in)
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Spark plug (Standard type) : Refer to EM-136, "Spark Plug".
Cleaner air pressure: Less than 588 kPa (6 bar, 6 kg/
cm
2, 85 psi)
Cleaning time: Less than 20 seconds
SMA773C
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CAMSHAFT VALVE CLEARANCE
EM-17
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CAMSHAFT VALVE CLEARANCE
Inspection and AdjustmentINFOID:0000000003802244
INSPECTION
Perform inspection as follows after removal, installation or replacement of camshaft or valve-related parts, or if
there is unusual engine conditions regarding valve clearance.
In cases of removing/installing or replacing camshaft and valve-
related parts, or of unusual engine conditions due to changes in
valve clearance (found malfunctions during stating, idling or causing
noise), perform inspection as follows:
1. Remove rocker covers (bank 1 and bank 2). Refer to EM-49, "
Exploded View".
2. Measure the valve clearance as follows:
a. Set No. 1 cylinder at TDC of its compression stroke.
 Rotate crankshaft pulley clockwise to align timing mark
(grooved line without color) ( ) with timing indicator.
 Check that intake and exhaust cam nose on No. 1 cylinder
(engine front side of bank 1) are located as shown in the fig-
ure.
 If not, turn crankshaft one revolution (360 degrees) and align
as shown in the figure.
b. Use a feeler gauge, measure the clearance between valve lifter
and camshaft.
: Engine front
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SEM727G
: Engine front
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Valve clearance : Refer to EM-136, "Camshaft".
SEM139D

EM-18
< ON-VEHICLE MAINTENANCE >
CAMSHAFT VALVE CLEARANCE
 By referring to the figure, measure the valve clearances at
locations marked “×” as shown in the table below (locations
indicated in the figure).
 No. 1 cylinder at compression TDC
c. Rotate crankshaft by 240 degrees clockwise (when viewed from engine front) to align No. 3 cylinder at
TDC its compression stroke.
NOTE:
Mark a position 240 degrees (b) from a corner of the hexagonal
part of crankshaft pulley mounting bolt as shown in the figure.
Use the hexagonal part as a guide.
: Engine front
Measuring position [bank 1 (A)] No. 1 CYL. No. 3 CYL. No. 5 CYL.
No. 1 cylinder at com-
pression TDCEXH (C)× (B)
INT (D)× (E)
Measuring position [bank 2 (H)] No. 2 CYL. No. 4 CYL. No. 6 CYL.
No. 1 cylinder at com-
pression TDCINT (D)× (F)
EXH (C)× (G)
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1 : Crankshaft pulley
A : Paint mark
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CAMSHAFT VALVE CLEARANCE
EM-19
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 By referring to the figure, measure the valve clearances at
locations marked “×” as shown in the table below (locations
indicated in the figure).
 No. 3 cylinder at compression TDC
d. Rotate crankshaft by 240 degrees clockwise (when viewed from engine front) to align No. 5 cylinder at
TDC of compression stroke.
NOTE:
Mark a position 240 degrees (b) from a corner of the hexagonal
part of crankshaft pulley mounting bolt as shown in the figure.
Use the hexagonal part as a guide.
: Engine front
Measuring position [bank 1 (A)] No. 1 CYL. No. 3 CYL. No. 5 CYL.
No. 3 cylinder at com-
pression TDCEXH (C)× (B)
INT (D)× (E)
Measuring position [bank 2 (H)] No. 2 CYL. No. 4 CYL. No. 6 CYL.
No. 3 cylinder at com-
pression TDCINT (D)× (F)
EXH (C)× (G)
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1 : Crankshaft pulley
A : Paint mark
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EM-20
< ON-VEHICLE MAINTENANCE >
CAMSHAFT VALVE CLEARANCE
 By referring to the figure, measure the valve clearances at
locations marked “×” as shown in the table below (locations
indicated in the figure).
 No. 5 cylinder at compression TDC
3. Perform adjustment if the measured value is out of the standard. Refer to “ADJUSTMENT”.
ADJUSTMENT
 Perform adjustment depending on selected head thickness of valve lifter.
1. Measure the valve clearance. Refer to “INSPECTION”.
2. Remove camshaft. Refer to EM-84, "
Exploded View".
3. Remove valve lifters at the locations that are out of the standard.
4. Measure the center thickness of the removed valve lifters with a
micrometer (A).
5. Use the equation below to calculate valve lifter thickness for replacement.
 VQ25DE
: Engine front
Measuring position [bank 1 (A)] No. 1 CYL. No. 3 CYL. No. 5 CYL.
No. 5 cylinder at
compression TDCEXH (C)× (B)
INT (D)× (E)
Measuring position [bank 2 (H)] No. 2 CYL. No. 4 CYL. No. 6 CYL.
No. 5 cylinder at
compression TDCINT (D)× (F)
EXH (C)× (G)
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Valve lifter thickness calculation: t = t1+ (C1 – C2)
t = Valve lifter thickness to be replaced
t
1= Removed valve lifter thickness
C
1= Measured valve clearance
C
2= Standard valve clearance:
Intake : 0.30 mm (0.012 in)
Exhaust : 0.33 mm (0.013 in)

CAMSHAFT VALVE CLEARANCE
EM-21
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- Thickness of new valve lifter can be identified by stamp marks
on the reverse side (inside the cylinder).
Stamped mark 788P indicates 7.88 mm (0.3102 in) in thick-
ness. (intake side)
Stamped mark 666U indicates 6.66 mm (0.2622 in) in thick-
ness. (exhaust side)
Available thickness of valve lifter: 27 size with range 7.88 to
8.40 mm (0.3102 to 0.3307 in) (intake side) and 6.66 to 7.18
mm (0.2622 to 0.2827 in) (exhaust side) in steps of 0.02
(0.0008 in) (when manufactured at factory). Refer to EM-136, "
Camshaft".
CAUTION:
Install identification letter at the end, “P”and “U”, at each of proper positions. (Be careful of mis-
installation between intake and exhaust)
 VQ35DE
- Thickness of new valve lifter can be identified by stamp marks
on the reverse side (inside the cylinder).
Stamp mark 788P indicates 7.88 mm (0.3102 in) in thickness.
Available thickness of valve lifter: 27 sizes with range 7.88 to 8.40 mm (0.3102 to 0.3307 in) in steps of
0.02 mm (0.0008 in) (when manufactured at factory). Refer to EM-136, "
Camshaft".
6. Install selected valve lifter.
7. Install camshaft. Refer to EM-84, "
Exploded View".
8. Manually turn crankshaft pulley a few turns.
9. Check that the valve clearances for cold engine are within the specifications by referring to the specified
values. Refer to EM-17, "
Inspection and Adjustment".
10. Install all removal parts in the reverse order of removal.
11. Warm up the engine, and check for unusual noise and vibration.
A: Stamp
B : Thickness of valve lifter
A: Stamp
B : Thickness of valve lifter
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EM-22
< ON-VEHICLE MAINTENANCE >
COMPRESSION PRESSURE
COMPRESSION PRESSURE
InspectionINFOID:0000000003802245
1. Warm up engine thoroughly. Then, stop it.
2. Release fuel pressure. Refer to EC-411, "
Inspection".
3. Disconnect fuel pump fuse to avoid fuel injection during measurement. Refer to EC-20,
"ComponentPartsLocation".
4. Remove engine cover. Refer to EM-24, "
Exploded View".
5. Remove ignition coil and spark plug from each cylinder. Refer to EM-49, "
Exploded View".
6. Connect engine tachometer (not required in use of CONSULT-III).
7. Install compression gauge with an adapter (commercial service
tool) onto spark plug hole.
 Use the adapter whose picking up end inserted to spark plug
hole is smaller than 20 mm (0.79 in) in diameter. Otherwise, it
may be caught by cylinder head during removal.
8. With accelerator pedal fully depressed, turn ignition switch to “START” for cranking. When the gauge
pointer stabilizes, read the compression pressure and the engine rpm. Perform these steps to check each
cylinder.
CAUTION:
Always use a fully charged battery to obtain the specified engine speed.
 If the engine speed is out of the specified range, check battery liquid for proper gravity. Check the
engine speed again with normal battery gravity.
 If compression pressure is below minimum value, check valve clearances and parts associated with
combustion chamber (valve, valve seat, piston, piston ring, cylinder bore, cylinder head, cylinder head
gasket). After the checking, measure compression pressure again.
 If some cylinder has low compression pressure, pour small amount of engine oil into the spark plug hole
of the cylinder to recheck it for compression.
- If the added engine oil improves the compression, piston rings may be worn out or damaged. Check pis-
ton rings and replace if necessary.
- If the compression pressure remains at low level despite the addition of engine oil, valves may be mal-
functioning. Check valves for damage. Replace valve or valve seat accordingly.
 If two adjacent cylinders have respectively low compression pressure and their compression remains
low even after the addition of engine oil, cylinder head gaskets are leaking. In such a case, replace cyl-
inder head gaskets.
9. After inspection is completed, install removed parts.
PBIC0900E
a: φ20 mm (0.79 in)
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Compression pressure : Refer to EM-135, "GeneralSpecification".

COMPRESSION PRESSURE
EM-23
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10. Start the engine, and check that the engine runs smoothly.
11. Perform trouble diagnosis. If DTC appears, erase it. Refer to EC-124, "
Description".

EM-24
< ON-VEHICLE REPAIR >
ENGINE COVER
ON-VEHICLE REPAIR
ENGINE COVER
Exploded ViewINFOID:0000000003802246
Removal and InstallationINFOID:0000000003802247
REMOVAL
1. Remove air duct (inlet). Refer to EM-26, "Exploded View".
2. Remove engine cover mounting bolts (A), (B).
3. Draw and pull out engine cover from engine cover mounting bolts (C), (D).
CAUTION:
 Pull engine cover from mounting bolt (D) holding with hand the position (E) as shown in the fig-
ure.
 Never damage or scratch engine cover when installing or removing.
4. Remove engine mounting bolts (C), (D), if necessary.
INSTALLATION
Install in the reverse order of removal.
1. Engine cover
Refer to GI-4, "
Components" for symbols in the figure.
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DRIVE BELT AUTO TENSIONER AND IDLER PULLEY
EM-25
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DRIVE BELT AUTO TENSIONER AND IDLER PULLEY
Exploded ViewINFOID:0000000003802248
Removal and InstallationINFOID:0000000003802249
Removal
1. Remove drive belt. Refer to EM-12, "Removal and Installation".
 Keep auto-tensioner pulley arm locked after drive belt is removed.
2. Remove auto-tensioner and idler pulley.
 Keep auto-tensioner pulley arm locked to install or remove auto-tensioner.
Installation
Installation is the reverse order of removal.
CAUTION:
If there is damage greater than peeled paint, replace drive belt auto-tensioner.
1. Drive belt auto-tensioner 2. Idler pulley 3. Idler pulley
4. Bracket
Refer to GI-4, "
Components" for symbols in the figure.
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