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CAMSHAFT VALVE CLEARANCEEM-19
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CAMSHAFT VALVE CLEARANCE
Inspection and AdjustmentINFOID:0000000005930930
INSPECTION
Perform inspection as follows after removal, installation or replacement of camshaft or valve-related parts, or if
there is 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:
a. Set No. 1 cylinder at TDC of its compression stroke. • Rotate crankshaft pulley (2) clockwise and align TDC mark(without paint mark) (A) to timing indicator (1) on front cover.
• At the same time, make sure that both intake and exhaust cam noses of No. 1 cylinder face inside as shown.
• If they do not face inside, rotate crankshaft pulley once more (360 degrees) and align as shown.
b. Use a feeler gauge, measure the clearance between valve lifter and camshaft.
• Measure the valve clearances at locations marked “× ” as
shown in the table below [locations indicated with black arrow
( ) as shown] with a feeler gauge.
B : White paint mark (Not use for service)
PBIC3673E
1 : Camshaft (INT)
2 : Camshaft (EXH)
: Engine front
PBIC3359J
Valve Clearance: Refer to EM-112, "Camshaft".
SEM139D
A : No. 1 cylinder compression TDC
: Engine front
Measuring position No. 1 CYL. No. 2 CYL. No. 3 CYL. No. 4 CYL.
Measurement po-
sition EXH
× ×
INT × ×
PBIC3707E
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EM-20
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CAMSHAFT VALVE CLEARANCE
c. Rotate crankshaft pulley (2) one revolution (360 degrees) and
align TDC mark (without paint mark) (A) to timing indicator (1) on
front cover.
• Measure the valve clearance at locations marked “ ×” as shown
in the table below [locations indicated with black arrow ( ) as
shown] with a feeler gauge.
3. If out of standard, perform adjustment procedure.
ADJUSTMENT
• Perform adjustment depending on selected head thickness of valve lifter.
1. Remove camshaft. Refer to EM-59, "
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 with a micrometer (A).
4. Use the equation below to calculate valve lifter thickness for replacement.
B : White paint mark (Not use for service)
PBIC3673E
A : No. 4 cylinder compression TDC : Engine front
Measuring position No. 1 CYL. No. 2 CYL. No. 3 CYL. No. 4 CYL.
Measurement
point EXH
× ×
INT × ×
PBIC3708E
PBIC3195J
Valve lifter thickness calculation: t = t1 + (C1 – C2)
t = Valve lifter thickness to be replaced
t
1 = Removed valve lifter thickness
C
1= Measured valve clearance
C
2= Standard valve clearance: Intake : 0.30 mm (0.012 in)
Exhaust : 0.33 mm (0.013 in)
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CAMSHAFT VALVE CLEARANCEEM-21
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• Thickness of new valve lifter (B) can be identified by stamp
mark (A) on the reverse side (inside the cylinder).
• Stamp mark “300” indicates 3.00 mm (0.118 in) in thickness.
NOTE:
Available thickness of valve lifter: 26 sizes range 3.00 to 3.50 mm (0.1181 to 0.1378 in) in steps of 0.02
mm (0.0008 in) (when manufactured at factory). Refer to EM-112, "
Camshaft".
5. Install the selected valve lifter.
6. Install camshaft. Refer to EM-59, "
Exploded View".
7. Manually rotate crankshaft pulley a few rotations.
8. Make sure that valve clearances for cold engine are wit hin specifications by referring to the specified val-
ues.
9. Install all removed parts in the reverse order of removal.
10. Warm up the engine, and check for unusual noise and vibration.
PBIC3196J
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COMPRESSION PRESSURE
COMPRESSION PRESSURE
InspectionINFOID:0000000005930931
1. Warm up engine thoroughly. Then, stop it.
2. Release fuel pressure. Refer to EC-499, "
Inspection".
3. Remove ignition coil and spark plug from each cylinder. Refer to EM-46, "
Exploded View".
4. Connect an engine tachometer (not required in use of CONSULT-III).
5. Install a compression tester (B) with an adapter (commercial service tool) (A) onto spark plug hole.
• Use the adapter whose picking up end inserted to spark plughole is smaller than 20 mm (0.79 in) in diameter. Otherwise, it
may be caught by cylinder head during removal.
6. With accelerator pedal fully depressed, turn ignition switch to “START” for cranking. When the gauge pointer stabilizes, read the compression pressure and the engine rpm. Perform these steps to check each
cylinder.
CAUTION:
Always use fully a charged battery to obtain the specified engine speed.
• If the engine speed is out of the specified range, c heck battery liquid for proper gravity. Check engine
speed again with normal battery gravity.
• If compression pressure is below minimum val ue, check valve clearances and parts associated with
combustion chamber (Valve, valve seat, piston, pi ston ring, cylinder bore, cylinder head, cylinder head
gasket). After the checking, measure the compression pressure again.
• If some cylinder has low compression pressure, pour small amount of engine oil into the spark plug hole of the cylinder to re-check it for compression.
- If the added engine oil improves the compression, pi ston rings may be worn out or damaged. Check pis-
ton rings and replace if necessary.
- If the compression pressure remains at low level despite the addition of engine oil, valves may be mal- functioning. Check valves for damage. Repl ace valve or valve seat accordingly.
• If two adjacent cylinders have respectively low co mpression pressure and their compression remains
low even after the addition of engine oil, cylinder head gasket is leaking. In such a case, replace cylinder
head gasket.
7. After inspection is completed, install removed parts.
8. Start the engine, and confirm that the engine runs smoothly.
9. Perform trouble diagnosis. If DTC appears, erase it. Refer to EC-114, "
Description".
PBIC3730E
SBIA0533E
Compression Pressure: Refer to EM-111, "General Specification".
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DRIVE BELT IDLER PULLEYEM-23
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ON-VEHICLE REPAIR
DRIVE BELT IDLER PULLEY
Exploded ViewINFOID:0000000005930932
Removal and InstallationINFOID:0000000005930933
REMOVAL
1. Remove drive belt. Refer to
EM-14, "Removal and Installation".
2. Remove the lock nut, and then remove the plate, idler pulley, and washer.
3. Remove the center shaft together with the spacer with inserting the adjusting bolt.
INSTALLATION
1 : Generator bracket
2 : Center shaft
3 : Spacer
4 : Adjusting bolt
5: Washer
6 : Idler pulley
7: Plate
PBIC3644E
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DRIVE BELT IDLER PULLEY
1. Insert the center shaft (1) into the slide groove of the spacer (2).
Fully screw in the adjusting bolt (3) in the belt loosening direc-
tion ( ).
• At that time, place the flange (a) of the adjusting bolt and theseat (b) of the center shaft on the spacer.
2. Place each surface (c, d) of the spacer on the generator bracket. Install the washer, idler pulley, and plate, and then temporarily
tighten the lock nut.
3. Installation is in the reverse order of removal. : 4.4 N·m (0.45 kg-m, 39 in-lb)
PBIC3885E
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AIR CLEANER AND AIR DUCTEM-25
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AIR CLEANER AND AIR DUCT
Exploded ViewINFOID:0000000005930934
Removal and InstallationINFOID:0000000005930935
REMOVAL
1. Remove the battery. Refer to
SC-7, "Removal and Installation".
2. Remove the air duct (front).
3. Remove the air cleaner filter from the air cleaner case. Refer to EM-16, "
Removal and Installation".
4. Remove the air duct (inlet) from the air cleaner case.
5. Remove the PCV hose.
6. Remove the air duct. • Add marks as necessary for easier installation.
7. Disconnect harness connector from mass air flow sensor.
8. Remove air cleaner case.
9. Remove the mass air flow sensor from the air cleaner case, if necessary. CAUTION:
• Handle mass air flow sensor carefully and avoid impacts.
• Never touch sensor part.
INSTALLATION
Installation is in the reverse order of removal.
1. Air cleaner filter 2. Mass air flow sensor 3. O-ring
4. Holder 5. Air cleaner cover 6. Air duct
7. PCV hose 8. Clip 9. Air duct (front)
10. Grommet 11. Air duct (inlet) 12. Grommet
13. Air cleaner case
A. To electric throttle control actuator B. To rocker cover
PBIC3645E
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EM-26
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AIR CLEANER AND AIR DUCT
• Align marks. Attach each joint. Screw clamps firmly.
InspectionINFOID:0000000005930936
INSPECTION AFTER REMOVAL
Inspect air ducts and air cleaner assembly for crack or tear.
• If anything found, replace air ducts and air cleaner assembly as necessary.
Revision: May 2010
2011 Versa