Nissan Versa Sedan Service ManualEngine » Engine mechanical (EM)
Camshaft valve clearance
Camshaft valve clearance
Inspection and Adjustment
INSPECTION
Perform inspection as follows after removal, replacement or installation of camshaft or valverelated parts, or if there are unusual engine conditions regarding valve clearance.
- Remove rocker cover.
- Measure the valve clearance with the following procedure:
- Set No. 1 cylinder at TDC of its compression stroke.
- Rotate crankshaft pulley (2) clockwise and align TDC mark (no paint) (A) to timing indicator (1) on front cover.
(B) : White paint mark (Not used for service)
- At the same 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 the lobes do not face inside, rotate the crankshaft pulley 360 degrees to align as shown.
- Use a feeler gauge (A) to measure the clearance between the valve lifter and camshaft.
- Refer to the figure. Using a feeler gauge, measure the valve
clearances at locations marked "×" in the table below [also
shown with black arrow ( )].
(A) : No. 1 cylinder
(B) : No. 2 cylinder
(C) : No. 3 cylinder
(D) : No. 4 cylinder
| Measuring position | No. 1 CYL. | No. 2 CYL. | No. 3 CYL. | No. 4 CYL. | |
| No. 1 cylinder at compression TDC | EXH | x | x | ||
| INT | x | x | |||
- Set No. 4 cylinder at TDC of its compression stroke.
- Rotate crankshaft pulley (2) one revolution (360 degrees) and align TDC mark (no paint) (A) to timing indicator (1) on front cover.
(B) : White paint mark (Not use for service)
- Refer to the figure. Using a feeler gauge, measure the valve
clearances at locations marked "×" in the table below [also
shown with black arrow (
)].
(A) : No. 1 cylinder
(B) : No. 2 cylinder
(C) : No. 3 cylinder
(D) : No. 4 cylinder
| Measuring position | No. 1 CYL. | No. 2 CYL. | No. 3 CYL. | No. 4 CYL. | |
| No. 4 cylinder at compression TDC | EXH | x | x | ||
| INT | x | x | |||
- If out of the specifications, adjust as necessary. Refer to "ADJUSTMENT".
ADJUSTMENT
NOTE:
Proper valve clearance is obtained by selecting the correct valve lifter head thickness.
- Remove camshaft.
- Remove valve lifters from the locations that are out of specification.
- Measure the center thickness of the removed valve lifters with a micrometer (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:
Intake : 0.30 mm (0.012 in)
Exhaust : 0.33 mm (0.013 in)
- Thickness of new valve lifter (B) can be identified by stamp mark (A) on the under side of the lifter.
NOTE:
Available thickness of valve lifter: 26 sizes range 3.00 to 3.50 mm (0.1181 to 0.1378 in) in increments of 0.02 mm (0.0008 in) when manufactured at factory.
- Stamp mark "302" indicates 3.02 mm (0.1189 in) in thickness.
- Install the correct thickness valve lifter.
- Install camshaft.
- Install timing chain and related parts.
- Manually rotate crankshaft pulley a few rotations.
- Check that valve clearances are within specification. Refer to "INSPECTION".
- Install remaining parts in the reverse order of removal.
- Warm up the engine, and check for unusual noise and vibration.