Nissan Armada 2025-2026 Service and Repair Manual: Inspection

INSPECTION PROCERDURE

Trouble Diagnosis of Turbocharger

Check items before trouble diagnosis

Check that the engine oil level is between L (Low level) and H (High level) of the oil level gauge. [When the engine oil amount is more then H (High level), the engine oil flows into the inlet duct through the blow-by gas passage, and the turbocharger is misjudged failure.]

Ask the customer if he/she always runs the vehicle in idle engine speed to cool the engine oil down after driving.

• Replace the turbocharger assembly when any malfunction is found after unit inspections specified in the table below.

• If no malfunction is found after the unit inspections, judge that the turbocharger body has no non-standard conditions. Check the other parts again.

  Inspection Location	Result	Symptoms likely to occur when the results shown on the left exist.
  		Oil leakage	Smoke	Noise*	Poor power Poor acceleration
  Turbine wheel	Wet with oil.	C	A	C	C
  	Carbon deposits observed.	C	A	B	B
  	“Rubs against” housing.	C	B	A	B
  	Vane is bent or broken.			A	A
  Compressor wheel	Inside of intake port is badly stained with oil.	B	B
  	“Rubs against” housing.	C	B	A	B
  	Vane is bent or broken.			A	A
  Check both turbine and compressor rotor shaft end play.	Heavy feel or catching when turned by hand.		C	C	B
  	Cannot be turned by hand.				A
  	Excessively loose bearing.	C	C	B	C
  Rotor shaft, oil return port (Check inside using penlight.)	Carbon or sludge deposits in oil drain port.	B	A	C	C
  Boost control valve actuator operation (using a handy pump)	Does not operate smoothly when air pressure is gradually applied. Stroke amount is not compliance with the air pressure.				A

  A:

  Highly possible.

  B:

  Possible.

  C:

  May exist.

  ^{* Racing under cold engine may generate a noise from the area of wastegate valve. This is not a turbocharger malfunction. The noise stops after engine warm-up.}

INSPECTION AFTER REMOVAL

Bank1 side

	Location to check for air leaks		Location to check for engine oil leaks		Location to check for engine coolant leaks
	Location to check for exhaust gas leaks

Bank2 side

	Location to check for air leaks		Location to check for engine oil leaks		Location to check for engine coolant leaks
	Location to check for exhaust gas leaks

CAUTION:

When the compressor wheel, turbine wheel or rotor shaft is damaged, remove all the fragments and foreign matter left in the following passages in order to prevent a secondary failure:

INSPECTION AFTER INSTALLATION

Start engine and raise engine speed to check no exhaust emission leaks.

© 2014-2026 Copyright www.niarmada.com

 
0.0051