2003 NISSAN ALMERA N16 sensor

ROCKER COVER
EM-29
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ROCKER COVERPFP:13264
Removal and InstallationEBS00LQA
CAUTION:
Apply new engine oil when installing the parts that specified to do so in the figure.
REMOVAL
1. Move harnesses on top surface and right side of rocker cover, and move them aside.
2. Remove ignition coil. Refer to EM-24, "
Removal and Installation" .
3. Disconnect PCV hoses on rocker cover side.
4. If necessary, remove PCV control valve.
5. If necessary, remove intake valve timing control solenoid valve and camshaft position sensor (PHASE).
CAUTION:
●Do not shock it.
●Do not disassemble it.
●Tip of camshaft position sensor (PHASE) generates strong magnetic fields. Keep it away from
metal particles or objects affected by magnetic fields.
KBIA1375E
1. PCV hose 2. Rocker cover 3. Grommet
4. PCV control valve 5. PCV hose 6.Intake valve timing control solenoid
valve
7. O-ring 8. Oil filter cap 9. Gasket
10. Gasket 11. Rocker cover oil seal 12. Gasket
13. O-ring 14. Camshaft position sensor (PHASE)

ROCKER COVER
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d. Tighten mounting screws to specified torque in 2 or more steps
in numerical order shown in figure.
3. Install intake valve timing control solenoid valve and camshaft position sensor (PHASE).
●Tighten bolt after fully inserting it into rocker cover.
4. Install PCV valve.
●Insert until flange contacts grommet tightly.
5. Install remaining parts in the reverse order of removal.Bolt length: Bolt position
25 mm (0.98 in) : 1
65 mm (2.56 in) : 2
20 mm (0.79 in) : Except the above (all circumference)
KBIA1376E

EM-60
[QG]
CYLINDER HEAD
3. Tighten cylinder auxiliary bolts (11) to (14) in numerical order
shown in figure.
●Pay attention to shank length under bolt head. [11: 20 mm
(0.79 in), 12 - 14: 25 mm (0.98 in)]
Disassembly and AssemblyEBS00LQJ
CAUTION:
●When installing camshafts, chain tensioners, oil seals or other sliding parts, lubricate contacting
surface with new engine oil.
●Apply new engine oil to threads and seat surface when installing cylinder head, camshaft
sprocket, crankshaft pulley and camshaft bracket.
●Attach tags to valve lifters so as not to mix them up.
DISASSEMBLY
1. Remove adjusting shim (if so equipped) and valve lifter.
●Confirm installation point.
SEM900F
PBIC0973E
1. Cylinder head 2. Valve (INT) 3. Valve (EXH)
4. Valve seat 5. Engine coolant temperature sensor 6. Copper washer
7. Spark plug tube 8. Spark plug

CYLINDER HEAD
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2. Remove valve collet.
●Compress valve spring with valve spring compressor (special
service tool). Remove valve collet with magnet driver.
3. Remove valve spring retainer and valve spring.
4. Push valve stem to combustion chamber side, and remove
valve.
●Inspect valve guide clearance before removal. Refer to EM-
63, "VALVE GUIDE CLEARANCE" .
●Confirm installation point.
5. Remove valve oil seal with valve oil seal puller (special service
tool).
6. Remove valve spring seat.
7. When valve seat must be replaced, refer to EM-64, "
VA LV E
SEAT REPLACEMENT" .
8. When valve guide must be replaced, refer to EM-63, "
VA LV E
GUIDE REPLACEMENT" .
9. Remove spark plug with spark plug wrench (commercial service
tool).
10. Remove engine coolant temperature sensor.
CAUTION:
Do not shock it.
11. Remove spark plug tube, as necessary.
●Using a pair of pliers, pull spark plug tube out of cylinder head.
CAUTION:
●Take care not to damage cylinder head.
●Once removed, a spark plug tube will be deformed and cannot be reused. Do not remove it
unless absolutely necessary.
ASSEMBLY
1. Install valve guide. Refer to EM-63, "VALVE GUIDE REPLACEMENT" .
2. Install valve seat. Refer to EM-64, "
VALVE SEAT REPLACEMENT" .
3. Install valve oil seal.
●Install with valve oil seal drift (special service tool) to match
dimension in illustration.
4. Install valve spring seat.
5. Install valve.
●Install larger diameter to intake side.
6. Install valve spring.
7. Install valve spring retainer.
PBIC1015E
SEM909F
PBIC0576E

EM-62
[QG]
CYLINDER HEAD
8. Install valve collet.
●Compress valve spring with valve spring compressor (special
service tool). Install valve collet with magnet hand.
●Tap stem edge lightly with plastic hammer after installation to
check its installed condition.
9. Install adjusting shim (if so equipped) and valve lifter.
10. Install engine coolant temperature sensor.
●Apply Genuine Liquid Gasket or equivalent to the thread.
11. Install spark plug tube.
●Press-fit spark plug tube following procedure below.
a. Remove old liquid gasket adhering to cylinder-head mounting
hole.
b. Apply liquid gasket to area within approximately 15 mm (0.59 in)
from edge of spark plug tube press-fit side.
●Use Genuine Liquid Gasket or equivalent.
c. Using a drift, press-fit spark plug tube so that its height “H” is as
specified in the figure.
CAUTION:
●When press-fitting, take care not to deform spark plug tube.
●After press-fitting, wipe off liquid gasket protruding onto cylinder-head upper face.
12. Install spark plug with spark plug wrench (commercial service tool).
Inspection After DisassemblyEBS00LQK
CYLINDER HEAD DISTORTION
1. Wipe off oil and remove water scale (like deposit), gasket,
sealer, carbon, etc with scraper.
CAUTION:
Use utmost care not to allow gasket debris to enter pas-
sages for oil or water.
2. At each of several locations on bottom surface of cylinder head,
measure distortion in six directions.
VALVE DIMENSIONS
Check dimensions of each valve. For dimensions, refer to EM-94,
"VA LV E" .
PBIC1016E
Standard press-fit height “H” :
: 41.0 - 42.0 mm (1.61 - 1.65 in)KBIA1248E
Limit : 0.1 mm (0.004 in)
PBIC0075E
SEM188A

EM-68
[QG]
ENGINE ASSEMBLY
WARNING:
●Position vehicle on a flat and solid surface.
●Place chocks at front and back of rear wheels.
●Do not remove engine until exhaust system has completely cooled off, otherwise, you may burn
yourself and/or fire may break out in fuel line.
●Before disconnecting fuel hose, release pressure.
Refer to EC-34 (WITH EURO-OBD), EC-428 (WITHOUT EURO-OBD).
●Be sure to lift engine and transaxle in a safe manner.
●For engines not equipped with engine slingers, attach proper slingers and bolts described in
PARTS CATALOG.
CAUTION:
●When lifting engine, be sure to clear surrounding parts. Use special care near accelerator wire
casing, brake lines and brake master cylinder.
●When lifting the engine, always use engine slingers in a safe manner.
●When removing drive shaft, be careful not to damage grease seal of transaxle.
●Before separating engine and transaxle, remove crankshaft position sensor (POS) from the cylin-
der block assembly.
●Always be extra careful not to damage edge of crankshaft position sensor (POS), or signal plate
teeth.
Engine cannot be removed separately from transaxle. Remove engine with transaxle as an assembly.
REMOVAL
1. Drain coolant from radiator and cylinder block. Refer to LC-17, "Chacking Engine Coolant".
2. Remove coolant reservoir tank and bracket.
3. Drain engine oil.
4. Remove battery and battery tray.
5. Remove air cleaner and air duct.
6. Remove drive belts.
7. Remove alternator and air conditioner compressor from engine.
8. Remove power steering oil pump from engine and position aside.
Power steering oil pump does not need to be disconnected from power steering tubes.
9. Remove the following parts:
●RH and LH front tires
●Splash covers
●RH and LH brake caliper assemblies
Refer to BR-28,"Removal".
Brake hose does not need to be disconnected from brake
caliper assembly. Never depress brake pedal.
●RH & LH drive shaft. Refer to AX-11, "Removal".
When removing drive shaft, be careful not to damage
transaxle side grease seal.
●Disconnect control rod and support rod from transaxle. (M/T
models.)
Refer to MT-26, "Removal".
●Disconnect control cable from transaxle. (A/T models.)
Refer to AT-411, "Removal".
SEM174D
SEM109G

CYLINDER BLOCK
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CAUTION:
Apply new engine oil to parts marked in illustration before installation.
DISASSEMBLY
1. Remove engine and transaxle assembly from vehicle, and separate transaxle from engine. Refer to EM-
67, "ENGINE ASSEMBLY" .
2. Mount engine on an engine stand with the following procedure.
a. Remove exhaust manifold and catalytic converter. Refer to EM-19, "
EXHAUST MANIFOLD AND CATA-
LYTIC CONVERTER" .
b. Remove engine front mounting bracket, alternator and air compressor bracket.
c. Install engine sub-attachment to left side of cylinder block.
d. Lift engine, and mount it onto the engine stand.
1. Rear oil seal 2. Rear oil seal retainer 3. Crankshaft position sensor (POS)
4. O-ring 5. Knock sensor 6. Oil level gauge guide
7. Cylinder block 8. Thrust bearing 9. Main bearing
10. Crankshaft 11. Key 12. Top ring
13. 2nd ring 14. Oil ring 15. Main bearing
16. Piston 17. Snap ring 18. Piston pin
19. Connecting rod 20. Connecting rod bearing 21. Connecting rod cap
22. Connecting rod nut 23. Main bearing cap bolt 24. Baffle plate
25. Main bearing cap 26. Signal plate 27. Rear plate
28. Coolant drain plug 29. Flywheel (M/T models) 30. Drive plate (A/T models)
PBIC0585E
PBIC1017E

EM-72
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CYLINDER BLOCK
●A commercial engine stand can be used.
NOTE:
●This example is an engine stand for holding at transaxle
mounting side with the flywheel or drive plate removed.
3. Drain engine oil and coolant from inside of engine.
4. Remove the following components and associated parts.
●Fuel tube and injector assembly; Refer to EM-26, "Removal and Installation" .
●Intake manifold and intake manifold collector assembly; Refer to EM-16, "Removal and Installation" .
●Ignition coil; Refer to EM-24, "Removal and Installation" .
●Rocker cover; Refer to EM-29, "Removal and Installation" .
●Oil pan and oil strainer; Refer to EM-22, "Removal and Installation" .
●Front cover and timing chain; Refer to EM-47, "Removal and Installation" .
●Camshaft; Refer to EM-32, "Removal and Installation" .
●Cylinder head assembly; Refer to EM-58, "Removal and Installation" .
●Auxiliary brackets and oil filter
5. Remove knock sensor.
CAUTION:
Avoid impacts such as a dropping.
6. Remove crankshaft position sensor (POS).
CAUTION:
●Avoid impacts such as a dropping.
●Do not disassemble.
●Keep it away from metal particles.
●Do not place sensor close to magnetic materials.
7. Remove flywheel (M/T models) or drive plate (A/T models). Fix
crankshaft with a ring gear stopper (special service tool), and
remove mounting bolts.
8. Remove rear plate.
9. Remove rear oil seal retainer.
●Insert a flat-bladed screwdriver between main bearing cap
and rear oil seal retainer to remove retainer.
10. Remove rear oil seal from rear oil seal retainer.
●Punch out with a flat-bladed screwdriver.
CAUTION:
●Be careful not to damage rear oil seal retainer.
PBIC0085E
PBIC0586E
SEM880F