Nissan Murano: Engine Mechanical :: Periodic Maintenance / Camshaft Valve Clearance

Valve Clearance

CHECKING

CAUTION:

Check valve clearance while engine is cold and not running.

NOTE:

Perform valve clearance inspection after removal, installation or replacement of camshaft or valve parts, or as necessary.

1. Remove the air duct with air cleaner case, collectors, hoses, wires, harnesses, and connectors. Refer to Removal and Installation.

2. Remove the intake manifold collector. Refer to Removal and Installation.

3. Remove the ignition coils and spark plugs. Refer to Exploded View.

4. Remove the rocker covers. Refer to Exploded View.

5. Set No.1 cylinder at TDC on its compression stroke.

   

   : Engine front

   1. Align pointer with TDC mark (A) on crankshaft pulley.

      

   2. Check that the valve lifters on No.1 cylinder, bank 1 (A) are loose and valve lifters on No.4 are tight. If not, turn the crankshaft one full revolution (360°) and align as shown.

      

: Engine front

1. Check only the valves as shown.

   

   Crank Position	Valve No. 1	Valve No. 2	Valve No. 3	Valve No. 6
   No. 1 TDC	Intake	Exhaust	Exhaust	Intake

   (A)	: Bank 1 cylinder head
   (B)	: Bank 2 cylinder head
   (C)	: Bank 2 exhaust camshaft
   (D)	: Bank 2 intake camshaft
   (E)	: Bank 1 intake camshaft
   (F)	: Bank 1 exhaust camshaft
   	: Engine front

   1. Using a feeler gauge, measure the clearance between the valve lifter and camshaft.

      

      Valve clearance

      : Refer to General Specification.

   2. Record any valve clearance measurements which are out of specification. They will be used later to determine the required replacement lifter size.

      (A)	: Camshaft
      (B)	: Valve lifter
      (C)	: Suitable tool

      

2. Turn crankshaft 240°.

3. Set No.3 cylinder at TDC on its compression stroke.

4. Check only those valves as shown.

   

   Crank Position	Valve No. 2	Valve No. 3	Valve No. 4	Valve No. 5
   No. 3 TDC	Intake	Intake	Exhaust	Exhaust

   (A)	: Bank 1 cylinder head
   (B)	: Bank 2 cylinder head
   (C)	: Bank 2 exhaust camshaft
   (D)	: Bank 2 intake camshaft
   (E)	: Bank 1 intake camshaft
   (F)	: Bank 1 exhaust camshaft
   	: Engine front

5. Turn the crankshaft 240° and align as above.

6. Set No.5 cylinder at TDC on its compression stroke.

7. Check only those valves as shown.

   

   Crank Position	Valve No. 1	Valve No. 4	Valve No. 5	Valve No. 6
   No. 5 TDC	Exhaust	Intake	Intake	Exhaust

   (A)	: Bank 1 cylinder head
   (B)	: Bank 2 cylinder head
   (C)	: Bank 2 exhaust camshaft
   (D)	: Bank 2 intake camshaft
   (E)	: Bank 1 intake camshaft
   (F)	: Bank 1 exhaust camshaft
   	: Engine front

8. Perform adjustment if the measured values are out of the specification range.

9. Installation of components is in the reverse order of removal.

VALVE ADJUSTING

CAUTION:

Adjust valve clearance while engine is cold.

NOTE:

• Perform adjustment by selecting the correct head thickness of the valve lifter (adjusting shims are not used).

• The specified valve lifter thickness dimension is measured at room temperature.

• Use specifications for hot engine for hot engine condition to confirm valve clearances.

1. Remove the camshaft.

2. Remove the valve lifter that was measured as being outside the standard specifications.

3. Measure the center thickness of the removed lifter with suitable tool (A) as shown.

   

4. Use the equation below to calculate the replacement valve lifter thickness.

   Valve lifter thickness calculation:	(C1 – C2) + t1=t
   	C1 = measured valve clearance
   	C2 = standard valve clearance
   	t1 = thickness of the removed lifter
   	t = thickness of the replacement lifter

   1. The thickness of the new valve lifter can be identified by the stamp mark (A) on the reverse side (inside the lifter).

      

      NOTE:

      Available thicknesses of the valve lifters (B) are: 3.00 - 3.50 mm (0.1181 - 0.1378 in), in 0.02 mm (0.0008 in) increments. Refer to Camshaft.

5. Install the selected replacement valve lifter.

6. Install the camshaft.

7. Rotate the crankshaft a few turns by hand.

8. Confirm that the valve clearances are within specification.

9. After the engine has been run to full operating temperature, confirm that the valve clearances are within specification.

   Standard Valve Clearance	Cold1 (reference data)	Hot2 (reference data)
   Intake	0.26 - 0.34 mm (0.010 - 0.013 in)	0.304 - 0.416 mm (0.012 - 0.016 in)
   Exhaust	0.29 - 0.37 mm (0.011 - 0.015 in)	0.308 - 0.432 mm (0.012 - 0.017 in)

   ¹ : Approximately 20°C (68°F)

   ² : Approximately 80°C (176°F)