Nissan Armada 2025-2026 Service and Repair Manual: Adjustment

WARNING:

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:

: Engine front

1. Remove rocker covers (bank 1 and bank 2).

2. Measure the valve clearance as follows:

   1. Set No. 1 cylinder at TDC of its compression stroke.

      • Rotate the crankshaft pulley clockwise as viewed from the front of the engine, and align the timing mark (grooved line without color) on the crankshaft pulley with (fourth from the end on the bank 2 side) on the front cover .

        

      • Check that intake and exhaust cam nose on No. 1 cylinder (engine front side of bank 1) are located as shown in the figure.

        

        : Engine front

      • If not, turn crankshaft one revolution (360 degrees) and align as shown in the figure.

   2. Use a feeler gauge (commercial service tool), measure the clearance between valve lifter and camshaft.

      

      Valve clearance

      : Refer to Camshaft

      • By referring to the figure, measure the valve clearances at locations marked “×” as shown in the table below (locations indicated in the figure).

        

        : Engine front

      • No. 1 cylinder at compression TDC

        Measuring position [bank 1 ]		No. 1 CYL.	No. 3 CYL.	No. 5 CYL.
        No. 1 cylinder at compression TDC	EXH		×
        	INT	×

        Measuring position [bank 2 ]		No. 2 CYL.	No. 4 CYL.	No. 6 CYL.
        No. 1 cylinder at compression TDC	INT			×
        	EXH	×

   3. Rotate crankshaft 240 degrees clockwise (when viewed from engine front) to align No. 3 cylinder at TDC its compression stroke.

      NOTE:

      Mark a position 240 degrees from a corner of the hexagonal part of crankshaft pulley mounting bolt as shown in the figure. Use the hexagonal part as a guide.

      

      	: Crankshaft pulley
      	: Paint mark

      • 

        : Engine front

      • No. 3 cylinder at compression TDC

        Measuring position [bank 1 ]		No. 1 CYL.	No. 3 CYL.	No. 5 CYL.
        No. 3 cylinder at compression TDC	EXH			×
        	INT		×

        Measuring position [bank 2 ]		No. 2 CYL.	No. 4 CYL.	No. 6 CYL.
        No. 3 cylinder at compression TDC	INT	×
        	EXH		×

   4. Rotate crankshaft 240 degrees clockwise (when viewed from engine front) to align No. 5 cylinder at TDC of compression stroke.

      NOTE:

      Mark a position 240 degrees from a corner of the hexagonal part of crankshaft pulley mounting bolt as shown in the figure. Use the hexagonal part as a guide.

      

      	: Crankshaft pulley
      	: Paint mark

      • 

        : Engine front

      • No. 5 cylinder at compression TDC

        Measuring position [bank 1 ]		No. 1 CYL.	No. 3 CYL.	No. 5 CYL.
        No. 5 cylinder at compression TDC	EXH	×
        	INT			×

        Measuring position [bank 2 ]		No. 2 CYL.	No. 4 CYL.	No. 6 CYL.
        No. 5 cylinder at compression TDC	INT		×
        	EXH			×

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.

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.

   Valve lifter thickness calculation:					t = t1+ (C1 – C2)
   	t	= Valve lifter thickness to be replaced
   	t1	= Removed valve lifter thickness
   	C1	= Measured valve clearance
   	C2	= Standard valve clearance:
   			Intake	: 0.30 mm (0.0118 in)
   			Exhaust	: 0.32 mm (0.0126 in)

   • Thickness of new valve lifter can be identified by stamp marks on the reverse side (inside the cylinder).

     

   • Thickness of new valve lifter can be identified by stamp marks on the reverse side (inside the cylinder).

     Stamp mark 300 indicates 3.00 mm (0.1181 in) in thickness.

     	: Stamp
     	: Thickness of valve lifter

     Available thickness of valve lifter: 26 sizes with range 3.00 to 3.50 mm (0.1181 to 0.1378 in) in steps of 0.02 mm (0.0008 in) (when manufactured at factory).

6. Install selected valve lifter.

7. Install camshaft.

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 “INSPECTION”.

10. Install all removal parts in the reverse order of removal.

11. Warm up the engine, and check for unusual noise and vibration.

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