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
Mass air flow sensor
Mass air flow gasket
Clamp
Air duct (suction side)
Resonator
Clamp
PCV hose
Clamp
Clamp
Air cleaner cover
Mounting rubber
Air cleaner f ...
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 ...
Other materials:
Ecm branch line circuit
Diagnosis procedure
1.Check connector
Turn the ignition switch off.
Disconnect the battery cable from the negative terminal.
Check the terminals and connectors of the ecm for damage, bend and loose
connection (unit side and
connector side).
Is the inspection result normal?
Yes > ...
Eps warning lamp does not turn on
Description
EPS warning lamp does not turn ON when turning ignition switch
ON from OFF. (Check the illumination of the
EPS warning lamp.)
Diagnosis Procedure
1.CHECK EPS WARNING LAMP
Perform the trouble diagnosis of EPS warning lamp. Refer to
STC-31, "Diagnosis Procedure".
Is ...
Preparation
Special Service Tool
The actual shape of the tools may differ from those illustrated here.
Commercial Service Tool
Clip list
Descriptions for clips
Replace any clips which are damaged during removal or installation.
...
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