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.
- Remove rocker cover. Refer to EM-46, "Exploded View".
- Measure the valve clearance with the following procedure:
- Set No. 1 cylinder at TDC of its compression stroke.
- Rotate crankshaft pulley (1) clockwise and align TDC mark (no
paint) (B) to timing indicator (A) on front cover.
(C) : White paint mark (Not used for service)
- At this time, check that both intake and exhaust cam lobes of
No. 1 cylinder face inside ( )
as shown.
(1) : Camshaft (INT)
(2) : Camshaft (EXH)
: Engine front
- If they do not face inside, rotate crankshaft pulley once more
(360 degrees) and align as shown.
- Measure the clearance between valve lifter and camshaft using
suitable tool as shown.
Valve clearance : Refer to EM-119, "Camshaft".
- Measure the valve clearances at locations marked “×” [locations
indicated with black arrow (
)] as shown using suitable
tool.
(A) : Exhaust side
(B) : Intake side
(1) : No. 1 cylinder
(2) : No. 2 cylinder
(3) : No. 3 cylinder
(4) : No. 4 cylinder
Engine front
- Set No. 4 cylinder at TDC of its compression stroke.
- Rotate crankshaft pulley (1) one revolution (360 degrees) and
align TDC mark (no paint) (B) to timing indicator (A) on front
cover.
(C) : White paint mark (Not used for service)
- Measure the valve clearance at locations marked “×” [locations
indicated with black arrow ( )]
as shown using suitable
tool.
(A) : Exhaust side
(B) : Intake side
(1) : No. 1 cylinder
(2) : No. 2 cylinder
(3) : No. 3 cylinder
(4) : No. 4 cylinder
: Engine front
- If out of standard, perform adjustment. Refer to “ADJUSTMENT”.
ADJUSTMENT
- Perform adjustment depending on selected head thickness of valve lifter.
- Remove camshaft. Refer to EM-60, "Exploded View".
- Remove valve lifters at the locations that are out of the standard.
- Measure the center thickness of the removed valve lifters using
suitable tool (A).
- 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:
- Thickness of new valve lifter (B) can be identified by stamp
mark (A) on the reverse side (inside the cylinder).
- Stamp mark “302” indicates 3.02 mm (0.1189 in) in thickness.
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".
- Install the selected valve lifter.
- Install camshaft. Refer to EM-60, "Exploded View".
- Install timing chain and related parts. Refer to EM-48, "Exploded View".
- Manually rotate crankshaft pulley a few rotations.
- Check that the valve clearances are within the standard. Refer to
“INSPECTION”.
- Installation of remaining components is in the reverse order of removal.
- Warm up the engine, and check for unusual noise and vibration.
Exploded View
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