2003 NISSAN TEANA engine

ENGINE MAINTENANCE (QR20DE)
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INSPECTION AFTER REMOVAL
Use standard type spark plug for normal condition.
Hot type spark plug is suitable when fouling occurs with standard type spark plug under conditions such as:

Frequent engine starts

Low ambient temperatures
Cold type spark plug is suitable when spark plug knock occurs with standard type spark plug under conditions
such as:

Extended highway driving

Frequent high engine revolution
CAUTION:

Do not drop or shock spark plug.

Do not use wire brush for cleaning.

If plug tip is covered with carbon, spark plug cleaner may
be used.

Checking and adjusting plug gap is not required between
change intervals.
INSTALLATION
Installation is the reverse order of removal.
Checking EVAP Vapor LinesBLS0009A
1. Visually inspect EVAP vapor lines for improper attachment and for cracks, damage, loose connections,
chafing and deterioration.
2. Inspect fuel tank filler cap vacuum relief valve for clogging, sticking, etc.
Refer to EC-27, "
EVAPORATIVE EMISSION SYSTEM" .
MakeNGK
Standard typePLFR5A-11
Hot typePLFR4A-11
Cold typePLFR6A-11
Gap (Nominal) : 1.1 mm (0.043 in)
Cleaner air pressure:
Less than 588 kPa (5.88 bar, 6 kg/cm
2 , 85 psi)
Cleaning time:
Less than 20 seconds
SMA773C
SMA806CA
Spark plug:
: 24.5 N·m (2.5 kg-m, 18 ft-lb)

MA-24
ENGINE MAINTENANCE (VQ23DE AND VQ35DE)

ENGINE MAINTENANCE (VQ23DE AND VQ35DE)PFP:00100
Checking Drive BeltsBLS0005J
WARNING:
Be sure to perform the following when engine is stopped.
1. Inspect belts for cracks, fraying, wear and oil. If necessary, replace.
2. Inspect drive belt deflection at a point on the belt midway
between pulleys.

Inspection should be done only when engine is cold, or over
30 minutes after engine is stopped.

When measuring deflection, apply 98 N (10 kg, 22 lb) at the
marked point.

Adjust if belt deflection exceeds the limit.
CAUTION:

When checking belt deflection immediately after installa-
tion, first adjust it to the specified value. Then, after turning
crankshaft two turns or more, re-adjust to the specified
value to avoid variation in deflection between pulleys.

Release the tension by loosing lock nut and turning adjust-
ing bolt when adjusting the belt. Tighten once the lock nut
at 4.9 N·m (0.50 Kg-m, 43 in-lb). Then, adjust the belt ten-
sion by loosing lock nut between 45° and 90°.
Belt Deflection
Tension AdjustmentBLS0005K
CAUTION:

When belt is replaced with a new one, adjust it to value for “New belt” to accommodate for insuffi-
cient adaptability with pulley grooves.

When deflection of belt being used exceeds “Limit”, adjust it to value for “After adjustment”.

When checking belt deflection immediately after installation, first adjust it to the specified value.
Then, after turning crankshaft two turns or more, re-adjust to the specified value to avoid variation
in deflection between pulleys.

When installing belt, make sure that it is correctly engaged with pulley groove.

Keep engine oil, working fluid and engine coolant away from belt.

Do not twist or bend belt excessively.
PBIC2449E
PBIC1162E
Deflection adjustment Unit: mm (in)
Used belt
New belt
Limit After adjustment
Alternator and A/C compressor
belt7 (0.28)4.2 - 4.6
(0.17 - 0.18)3.7 - 4.1
(0.15 - 0.16)
Power steering oil pump belt 11 (0.43)7.3 - 8.0
(0.29 - 0.30)6.5 - 7.2
(0.26 - 0.28)
Applied pushing force 98 N (10 Kg, 22 lb)
PortionBelt tightening method for adjustment
Alternator and A/C compressor belt Adjusting bolt on idler pulley
Power steering oil pump belt Adjusting bolt on power steering oil pump

ENGINE MAINTENANCE (VQ23DE AND VQ35DE)
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ALTERNATOR AND A/C COMPRESSOR BELT
1. Remove splash guard (RH).
2. Loosen idler pulley lock nut (A).
3. Release the belt tension on idler pulley by turning adjusting nut
(B).
4. Tighten lock nut (A).
5. Loosen lock nut (A) between 45° and 90°.
6. Adjust tension by turning adjusting nut (B).

For specified belt tension, refer to EM-128, "Checking Drive
Belts" .
7. Tighten lock nut (A).
8. Tighten adjusting nut (B).
POWER STEERING OIL PUMP BELT
1. Remove splash guard (RH).
2. Loosen lock bolt (C).
3. Loosen power steering oil pump mounting bolt (D).

Bolt head (D) is engine rear side.
4. Adjust tension by turning adjusting bolt (E).

For specified belt tension, refer to MA-24, "Checking Drive Belts" .
NOTE:
Adjusting bolt (E) is loosened with counterclockwise rotation.
5. Tighten lock bolt (C).
6. Tighten power steering oil pump mounting bolt (D).
Changing Engine CoolantBLS0005L
WARNING:

To avoid being scalded, do not change engine coolant when engine is hot.

Wrap a thick cloth around radiator cap and carefully remove the cap. First, turn the cap a quarter
of a turn to release built-up pressure. Then turn the cap all the way.

Be careful not to allow engine coolant to contact drive belts. : 4.9 N·m (0.50 kg-m, 43 in-lb)
: 34.8 N·m (3.5 kg-m, 26 ft-lb)
: 5.4 N·m (0.55 kg-m, 48 in-lb)
PBIC2450E
: 28.0 N·m (2.9 kg-m, 21 ft-lb)
: 43.1 N·m (4.4 kg-m, 32 ft-lb)

MA-26
ENGINE MAINTENANCE (VQ23DE AND VQ35DE)

DRAINING ENGINE COOLANT
1. Remove grommet from undercover.
2. Open radiator drain plug at the bottom of radiator, and then remove radiator cap.
When drain all of engine coolant in the system, open water drain plugs on cylinder block. Refer to
EM-229, "
DISASSEMBLY" .
3. Remove reservoir tank as necessary, and drain engine coolant and clean reservoir tank before installing.
4. Check drained engine coolant for contaminants such as rust, corrosion or discoloration.
If contaminated, flush the engine cooling system. Refer to MA-27, "
FLUSHING COOLING SYSTEM" .
REFILLING ENGINE COOLANT
1. Install reservoir tank if removed, and radiator drain plug.
CAUTION:
Be sure to clean drain plug and install with new O-ring.
If water drain plugs on cylinder block are removed, close and tighten them. Refer to EM-233,
"ASSEMBLY" .
2. Make sure that each hose clamp has been firmly tightened.
3. Remove air duct assembly. Refer to EM-131, "
AIR CLEANER AND AIR DUCT" .
4. Disconnect heater hose (left side of vehicle) at the position in
the figure.

Enhance heater hose as high as possible.
5. Fill radiator and reservoir tank to specified level.

Pour engine coolant through engine coolant filler neck
slowly of less than 2 (1-3/4 lmp qt) a minute to allow air
in system to escape.

Use NISSAN Genuine Engine Coolant or equivalent
mixed with water (distilled or demineralized). Refer to
MA-14, "
RECOMMENDED FLUIDS AND LUBRICANTS".
PBIC2512E
Radiator drain plug:
: 1.2 N·m (0.12 kg-m, 11 in-lb)
PBIC2810E
Engine coolant capacity
(With reservoir tank at “MAX” level)
: Approx. 8.2 (7-1/4 lmp qt) [VQ23DE]
: Approx. 8.8 (7-3/4 lmp qt) [VQ35DE]
SMA182B

ENGINE MAINTENANCE (VQ23DE AND VQ35DE)
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When engine coolant overflows disconnected heater hose, connect heater hose, and continue filling the
engine coolant.
6. Install air duct assembly. Refer to EM-131, "
AIR CLEANER AND AIR DUCT" .
7. Install radiator cap.
8. Warm up until opening thermostat. Standard for warming-up time is approximately 10 minutes at 3000
rpm.

Make sure thermostat opening condition by touching radiator hose (lower) to see a flow of warm water.
CAUTION:
Watch water temperature gauge so as not to overheat engine.
9. Stop engine and cool down to less than approximately 50°C (122°F).

Cool down using fan to reduce the time.

If necessary, refill radiator up to filler neck with engine coolant.
10. Refill reservoir tank to “MAX” level line with engine coolant.
11. Repeat steps 3 through 9 two or more times with radiator cap installed until engine coolant level no longer
drops.
12. Check cooling system for leaks with engine running.
13. Warm up engine, and check for sound of engine coolant flow while running engine from idle up to 3,000
rpm with heater temperature controller set at several position between “COOL” and “WARM”.

Sound may be noticeable at heater unit.
14. Repeat step 13 three times.
15. If sound is heard, bleed air from cooling system by repeating step 3 through 9 until engine coolant level no
longer drops.

Clean excess engine coolant from engine.
FLUSHING COOLING SYSTEM
1. Install reservoir tank if removed, and radiator drain plug.
CAUTION:
Be sure to clean drain plug and install with new O-ring.
If cylinder block water drain plugs are removed, close and tighten them. Refer to EM-233, "
ASSEM-
BLY" .
2. Remove air duct assembly. Refer to EM-131, "
AIR CLEANER AND AIR DUCT" . Reservoir tank engine coolant capacity
(At “MAX” level)
: 0.8 (3/4 lmp qt)
SMA412B
Radiator drain plug:
: 1.2 N·m (0.12 kg-m, 11 in-lb)

MA-28
ENGINE MAINTENANCE (VQ23DE AND VQ35DE)

3. Disconnect heater hose (left side of vehicle) at the position in
the figure.

Enhance heater hose as high as possible.
4. Fill radiator and reservoir tank with water and install radiator cap.

When engine coolant overflows disconnected heater hose, connect heater hose, and continue filling the
engine coolant.
5. Install air duct assembly. Refer to EM-131, "
AIR CLEANER AND AIR DUCT" .
6. Run engine and warm it up to normal operating temperature.
7. Rev engine two or three times under no-load.
8. Stop engine and wait until it cools down.
9. Drain water from the system. Refer to MA-26, "
DRAINING ENGINE COOLANT" .
10. Repeat steps 1 through 9 until clear water begins to drain from radiator.
Checking Cooling SystemBLS0005M
WARNING:
Never remove the radiator cap when the engine is hot; serious burns could be caused by high pres-
sure fluid escaping from the radiator.
Wrap a thick cloth around the cap and carefully remove it by turning it a quarter turn to allow built-up
pressure to escape and then turn the cap all the way off.
CHECKING COOLING SYSTEM HOSES
Check hoses for improper attachment, leaks, cracks, damage, loose connections, chafing and deterioration.
If necessary, repair or replace damaged parts.
CHECKING RADIATOR CAP

Check valve seat of radiator cap.
–Check if valve seat is swollen to the extent that the edge of the
plunger cannot be seen when watching it vertically from the top.
–Check if valve seat has no soil and damage.

Pull negative-pressure valve to open it, and make sure that it is
completely closed when released.
–Make sure that there is no dirt or damage on the valve seat of
radiator cap negative-pressure valve.
–Make sure that there are no unusualness in the opening and
closing conditions of negative-pressure valve.
PBIC2810E
PBIC2816E
SMA967B

ENGINE MAINTENANCE (VQ23DE AND VQ35DE)
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Check radiator cap relief pressure.
–When connecting radiator cap to the radiator cap tester (com-
mercial service tool) and the radiator cap tester adapter [SST],
apply engine coolant to the cap seal surface.

Replace radiator cap if there is an unusualness related to the above three.
CAUTION:
When installing radiator cap, thoroughly wipe out the radiator filler neck to remove any waxy residue
or foreign material.
CHECKING RADIATOR
Check radiator for mud or clogging. If necessary, clean radiator as follows.

Be careful not to bend or damage the radiator fins.

When radiator is cleaned without removal, remove all surrounding parts such as cooling fan, radiator
shroud and horns. Then tape harness and electrical connectors to prevent water from entering.
1. Apply water by hose to the back side of radiator core vertically downward.
2. Apply water again to all radiator core surface once per minute.
3. Stop washing if any stains no longer flow out from radiator.
4. Blow air into the back side of radiator core vertically downward.

Use compressed air lower than 490 kPa (4.9 bar, 5 kg/cm2 , 71 psi) and keep distance more than 30 cm
(11.8 in).
5. Blow air again into all the radiator core surfaces once per minute until no water sprays out.
CHECKING COOLING SYSTEM FOR LEAKS

To check for leaks, apply pressure to the cooling system with
radiator cap tester (commercial service tool) and radiator cap
tester adapter [SST].
WARNING:
Do not remove radiator cap when engine is hot. Serious
burns could occur from high-pressure engine coolant
escaping from radiator.
CAUTION:
Higher testing pressure than specified may cause radiator
damage.
NOTE:
In a case engine coolant decreases, replenish radiator with engine coolant.

If anything is found, repair or replace damaged parts.Standard:
78 - 98 kPa (0.78 - 0.98bar, 0.8 - 1.0 kg/cm
2 , 11 - 14 psi)
Limit:
59 kPa (0.59bar, 0.6 kg/cm
2 , 9 psi)
SLC755AC
Testing pressure
: 157 kPa (1.57 bar, 1.6 kg/cm
2 , 23 psi)
SLC756AA

MA-30
ENGINE MAINTENANCE (VQ23DE AND VQ35DE)

Checking Fuel LinesBLS0005N
Inspect fuel lines, fuel filler cap and fuel tank for improper attach-
ment, leaks, cracks, damage, loose connections, chafing or deterio-
ration.
If necessary, repair or replace damaged parts.
Changing Air Cleaner FilterBLS0005O
VISCOUS PAPER TYPE
The viscous paper type filter does not need cleaning between replacement intervals. Refer to MA-8, "PERI-
ODIC MAINTENANCE" .
Removal
1. Unhook air cleaner case (lower) side clips and lift up air cleaner case (upper).
2. Remove air cleaner filter.
Installation
Installation is the reverse order of removal.
Changing Engine OilBLS0005P
WARNING:

Be careful not to burn yourself, as engine oil may be hot.

Prolonged and repeated contact with used engine oil may cause skin cancer; try to avoid direct
skin contact with used engine oil. If skin contact is made, wash thoroughly with soap or hand
cleaner as soon as possible.
1. Warm up engine, put vehicle horizontally and check for engine oil leakage from engine components. Refer
to LU-19, "
ENGINE OIL LEAKAGE" .
2. Stop engine and wait for 10 minutes.
3. Loosen oil filler cap and then remove drain plug.
4. Drain engine oil.
5. Install drain plug with new washer. Refer to EM-145, "
OIL PAN AND OIL STRAINER" .
CAUTION:
Be sure to clean drain plug and install with new washer.
6. Refill with new engine oil.
Engine oil specification and viscosity:
Refer to MA-14, "
RECOMMENDED FLUIDS AND LUBRICANTS" .
SMA803A
PBIC2452E
Oil pan drain plug:
: 34.3 N·m (3.5 kg-m, 25 ft-lb)