Nissan Frontier D40. Manual - part 835

ENGINE MAINTENANCE (QR25DE ENGINE)

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ENGINE MAINTENANCE (QR25DE ENGINE)

DRIVE BELTS

DRIVE BELTS : Exploded View

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DRIVE BELTS : Checking Drive Belts

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WARNING:

Be sure to perform when the engine is stopped.

1.

Remove air duct and resonator assembly when inspecting drive belt. Refer to 

EM-139, "Removal and

Installation"

.

2.

Make sure that the auto tensioner indicator is within the allowable working range.

3.

Visually check entire belt for wear, damage or cracks.

4.

If the indicator is out of allowable working range or drive belt is damaged, replace the drive belt. Refer to

EM-127, "Removal and Installation"

.

DRIVE BELTS : Tension Adjustment

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Belt tensioning is not necessary, as it is automatically adjusted by drive belt auto-tensioner.

ENGINE COOLANT

ENGINE COOLANT : System Inspection

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WARNING:

• Never remove the radiator cap or reservoir tank cap when the engine is hot. Serious burns could

occur from high pressure fluid escaping from the radiator or reservoir.

• Wrap a thick cloth around the cap. Slowly push down and turn it a quarter turn to allow built-up pres-

sure to escape. Carefully remove the cap by pushing down and turning it all the way.

CHECKING COOLING SYSTEM HOSES

Check hoses for the following:
• Improper attachment
• Leaks

1.

Drive belt

2.

Power steering oil pump pulley

3.

Generator pulley

4.

Crankshaft pulley

5.

A/C compressor (if equipped) or idler 
pulley

6.

Idler pulley

7.

Water pump

8.

Idler pulley

9.

Drive belt auto- tensioner

A.

Allowable working range

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ENGINE MAINTENANCE (QR25DE ENGINE)

• Cracks
• Damage
• Loose connections
• Chafing
• Deterioration

CHECKING RESERVOIR LEVEL

• Check if the engine coolant reservoir tank level is within MIN to

MAX when the engine is cool.

• Adjust engine coolant level as necessary.

CHECKING COOLING SYSTEM FOR LEAKS

WARNING:

Never remove the radiator cap or reservoir cap when the engine is hot. Serious burns could occur
from high pressure coolant escaping from the radiator or reservoir.
To check for leakage, apply pressure to the cooling system using
Tool.

CAUTION:

Higher pressure than specified may cause radiator damage.
NOTE:
• In case that engine coolant decreases, replenish cooling system

with engine coolant.

• If any concerns are found, repair or replace damaged parts.

CHECKING RESERVOIR CAP

1.

Inspect the reservoir cap.
• Replace the cap if the metal plunger cannot be seen around the edge of the black rubber gasket.
• Replace the cap if deposits of waxy residue or other foreign material are on the black rubber gasket or

the metal retainer.

NOTE:
Thoroughly wipe out the reservoir filler neck to remove any waxy residue or foreign material.

2.

Pull the negative-pressure valve to open it and check that it
closes completely when released.
• Check that there is no dirt or damage on the valve seat of the

reservoir cap negative-pressure valve. 

• Check that there are no abnormalities in the opening and clos-

ing conditions of the negative-pressure valve.

SMA412B

Tool number

: EG17650301 (J-33984-A)

Testing pressure

: 137 kPa (1.4 kg/cm

2

, 20 psi)

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ENGINE MAINTENANCE (QR25DE ENGINE)

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3.

Check reservoir cap relief pressure using Tool.

• Apply engine coolant to the cap seal surface. 
• Replace the reservoir cap if there is any damage in the nega-

tive-pressure valve, or if the open-valve pressure is outside of
the limit.

CHECKING RADIATOR CAP

Inspect the radiator cap.
NOTE:
Thoroughly wipe out the radiator filler neck to remove any waxy residue or foreign material.
• Replace the cap if the metal plunger cannot be seen around the edge of the black rubber gasket.
• Replace the cap if deposits of waxy residue or other foreign material are on the black rubber gasket or the

metal retainer.

CHECKING RADIATOR

Check radiator for mud or clogging. If necessary, clean radiator as follows.

CAUTION:

• Be careful not to bend or damage the radiator fins.
• When radiator is cleaned without removal, remove all surrounding parts such as cooling fan shroud

and horns. Then tape the harness and electrical connectors to prevent water from entering.

1.

Apply water by hose to the back side of the radiator core, with the hose pointed vertically downward.

2.

Apply water again to all radiator core surfaces once per minute.

3.

Stop washing if any stains no longer flow out from the radiator.

4.

Blow air into the back side of radiator core, with the air hose pointed vertically downward.
• Use compressed air lower than 490 kPa (5 kg/cm

2

, 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.

6.

Check for leaks.

ENGINE COOLANT : Changing Engine Coolant

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WARNING:

• To avoid being scalded, never change the coolant when the engine is hot.
• Wrap a thick cloth around the cap to carefully remove the cap. First, turn the cap a quarter of a turn

to release any built-up pressure, then push down and turn the cap all the way to remove it.

DRAINING ENGINE COOLANT

1.

Turn ignition switch ON and set temperature control lever all the way to HOT position or the highest tem-
perature position. Wait 10 seconds and turn ignition switch OFF.

2.

Remove the engine front undercover. Refer to 

EXT-13, "Removal and Installation"

.

3.

Open the radiator drain plug at the bottom of the radiator, and
remove the reservoir cap. This is the only step required when
partially draining the cooling system (radiator only). 

CAUTION:

Do not allow the coolant to contact the drive belts. 

Tool number

: EG17650301 (J-33984-A)

Standard: 98 – 118 kPa (1.0 – 1.2 kg/cm

2

, 14 – 17 psi)

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ENGINE MAINTENANCE (QR25DE ENGINE)

4.

Follow this step for heater core removal/replacement only. Disconnect the upper heater hose at the
engine side and apply moderate air pressure [103.46 kPa (15 psi, 1.055 kg/cm

2

) maximum air pressure]

into the hose for 30 seconds to blow the excess coolant out of the heater core.

5.

When draining all of the coolant in the system for engine
removal or repair, it is necessary to drain the cylinder block.
Remove the cylinder block drain plug to drain the cylinder block
as shown.

6.

Remove the reservoir tank to drain the engine coolant, then clean the reservoir tank before installing it.

7.

Check the drained coolant for contaminants such as rust, corrosion or discoloration.
If the coolant is contaminated, flush the engine cooling system. Follow the "Flushing Cooling System" pro-
cedure. 

REFILLING ENGINE COOLANT

1.

Close the radiator drain plug. Install the reservoir tank and cylin-
der block drain plug, if removed for a total system drain or for
engine removal or repair.
• The radiator must be completely empty of coolant and water.
• Apply sealant to the threads of the cylinder block drain plugs.

Use Genuine High Performance Thread Sealant or equivalent.
Refer to 

GI-22, "Recommended Chemical Products and Seal-

ants"

.

2.

Set the vehicle heater controls to the full HOT and heater ON position. Turn the vehicle ignition ON with
the engine OFF as necessary to activate the heater mode.

3.

Remove the vented reservoir cap and replace it with a non-vented reservoir cap before filling the cooling
system.

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Radiator drain plug

: Refer to 

CO-16

.

Cylinder block drain plug

: Refer to 

EM-78

.

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