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CHECKING Nissan Altima L31 facelift

Engine Mechanical - VQ35DE 8 illustrations ~349 words

CHECKING

  1. 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. Check valve clearance while engine is cold and not running.

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  1. Remove the air duct with air cleaner case, collectors, hoses, wires, harnesses, and connectors.
  2. Remove the intake manifold collectors.
  3. Remove the ignition coils and spark plugs.
  4. Remove the rocker covers.
  5. Set No. 1 cylinder at TDC on its compression stroke. Align pointer with TDC mark on crankshaft pulley. Check that the valve lifters on No. 1 cylinder are loose and valve lifters on No. 4 are tight. If not, turn the crankshaft one full revolution (360°) and align as shown.
  6. Check only the valves as shown. INTAKE AND EXHAUST REFERENCE Crank Position Valve No. 1 Valve No. 2 Valve No. 3 Valve No. 6 No. 1 TDC Intake Exhaust Exhaust Intake Using a feeler gauge, measure the clearance between the valve lifter and camshaft. Record any valve clearance measurements which are out of specification. They will be used later to determine the required replacement lifter size. Valve Clearance for Checking (cold) Intake: 0.26 - 0.34 mm (0.010 - 0.013 in) Exhaust: 0.29 - 0.37 mm (0.011 - 0.015 in)
  7. Turn crankshaft 240°.
  8. Set No. 3 cylinder at TDC on its compression stroke.
  9. Check only those valves as shown. INTAKE AND EXHAUST REFERENCE Crank Position Valve No. 2 Valve No. 3 Valve No. 4 Valve No. 5 No. 3 TDC Intake Intake Exhaust Exhaust
  10. Turn the crankshaft 240° and align as above.
  11. Set No. 5 cylinder at TDC on its compression stroke.
  12. Check only those valves as shown. INTAKE AND EXHAUST REFERENCE Crank Position Valve No. 1 Valve No. 4 Valve No. 5 Valve No. 6 No. 5 TDC Exhaust Intake Intake Exhaust
  13. If all valve clearances are within specification, install the following components. If the valve clearances are out of specification, adjust the valve clearances. Intake manifold collectors Rocker covers All spark plugs All ignition coils