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Checking Valve Clearance Nissan Sentra B14

Mechanical 1 illustration ~302 words
  1. Disconnect negative battery cable. Remove spark plugs and cylinder head cover. Rotate crankshaft until cylinder No. 1 is at TDC of compression stroke. Ensure timing mark on crankshaft pulley aligns with "0" mark on timing belt cover.
  2. Ensure valve lifters on cylinder No. 1 are loose and valve lifters on cylinder No. 4 are tight. Using feeler gauge, measure and record clearance between valve lifter and camshaft at valves specified in «VALVE CLEARANCE CHECKING SEQUENCE»(ref-49352-S19388588112001011500000) . VALVE CLEARANCE CHECKING SEQUENCE Cylinder No. At TDC Check Intake Valves No. Check Exhaust Valves No. 1 1 & 2 1 & 3 4 3 & 4 2 & 4
  3. To check remaining valves, rotate crankshaft 360 degrees (cylinder No. 4 at TDC of compression stroke). Measure and record valve clearance at remaining valves. If clearance is not as follows, adjust valves. Exhaust - .012-.023" (.30-.58 mm) Intake - .008-.019" (.21-.49 mm)

Note. Adjust valve clearance when engine is cold.

Scheme 1

Scheme 1: Adjusting Valve Clearance
Scheme 1: Adjusting Valve Clearance
  1. Rotate camshaft until lobe is facing upward, away from valve lifter. Rotate valve lifter so notch on valve lifter is facing center of cylinder head. Rotate Valve Clearance Adjuster (J38972-1) to push valve lifter downward. (Scheme 1)
  2. Place Valve Lifter Retainer (J38972-2) between camshaft and valve lifter. Using a magnet and small screwdriver, remove valve clearance adjusting shim. Using a micrometer, measure thickness of shim removed.
  3. If valve clearance is not as specified, install appropriate size shim. Shims are available in 50 sizes, ranging in thickness from.0787" (2.00 mm) to.1173" (2.98 mm) in increments of.0008" (.020 mm). Thickness is stamped in millimeters on bottom face of shim.
  4. Ensure clearance is as specified in «VALVE CLEARANCE SPECIFICATIONS (ADJUSTING)»(ref-49352-S01117438062001011500000) (use cold specification). Install cylinder head cover. Tighten bolts to specification. See «TORQUE SPECIFICATIONS»(ref-49352-S11612011362001011500000). Recheck clearance when engine is warm.
ValveCold In. (mm)(1) Hot In. (mm)
Exhaust.013-.016 (.32-.40).015-.018 (.37-.45)
Intake.010-.013 (.25-.32).013-.016 (.32-.40)
(1) Although hot specifications are provided, adjust valve clearance to cold specification when components are cold.
(1)Although hot specifications are provided, adjust valve clearance to cold specification when components are cold.

VALVE CLEARANCE SPECIFICATIONS (ADJUSTING)