Nissan Sentra manuals

Nissan Sentra Service Manual: Camshaft valve clearance

Inspection and Adjustment

INSPECTION

Perform inspection after removal, installation or replacement of camshaft or valve-related parts, or if there are unusual engine conditions regarding valve clearance.

  1. Remove rocker cover. Refer to EM-46, "Exploded View".
  2. Measure the valve clearance with the following procedure:
  1. Set No. 1 cylinder at TDC of its compression stroke.

(C) : White paint mark (Not used for service)


(1) : Camshaft (INT)

(2) : Camshaft (EXH)

: Engine front



  1. Measure the clearance between valve lifter and camshaft using suitable tool as shown.

Valve clearance : Refer to EM-119, "Camshaft".


(A) : Exhaust side


(A) : Exhaust side

(B) : Intake side

(1) : No. 1 cylinder

(2) : No. 2 cylinder

(3) : No. 3 cylinder

(4) : No. 4 cylinder

Engine front



  1. Set No. 4 cylinder at TDC of its compression stroke.

(C) : White paint mark (Not used for service)


(A) : Exhaust side

(B) : Intake side

(1) : No. 1 cylinder

(2) : No. 2 cylinder

(3) : No. 3 cylinder

(4) : No. 4 cylinder

: Engine front




  1. If out of standard, perform adjustment. Refer to “ADJUSTMENT”.

ADJUSTMENT

  1. Remove camshaft. Refer to EM-60, "Exploded View".
  2. Remove valve lifters at the locations that are out of the standard.
  3. Measure the center thickness of the removed valve lifters using suitable tool (A).


  1. 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:

NOTE:


NOTE:

Available thickness of valve lifter: 26 sizes range 3.00-3.50 mm (0.1181-0.1378 in) in steps of 0.02 mm (0.0008 in) (when manufactured at factory). Refer to EM-119, "Camshaft".

  1. Install the selected valve lifter.
  2. Install camshaft. Refer to EM-60, "Exploded View".
  3. Install timing chain and related parts. Refer to EM-48, "Exploded View".
  4. Manually rotate crankshaft pulley a few rotations.
  5. Check that the valve clearances are within the standard. Refer to “INSPECTION”.
  6. Installation of remaining components is in the reverse order of removal.
  7. Warm up the engine, and check for unusual noise and vibration.
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Compression pressure
Inspection Warm up the engine to full operating temperature. Release fuel pressure. Refer to EC-143, "Work Procedure". Remove ignition coil and spark plug from each cylinder. Refer t ...

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System description
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