NISSAN ALMERA N16 2001 Electronic Repair Manual

ComponentsNJEM0108
SEM106G
1. Oil filler cap
2. Rocker cover
3. Rocker cover gasket
4. Intake valve timing control sole-
noid (Models with intake valve tim-
ing control)
5. Camshaft bracket
6. Intake camshaft7. Exhaust camshaft
8. Timing chain guide
9. Cylinder head bolt
10. Shim
11. Valve lifter
12. Valve cotter
13. Valve spring retainer
14. Valve spring15. Valve spring seat
16. Valve oil seal
17. Valve guide
18. Cylinder head
19. Cylinder head gasket
20. Valve seat
21. Valve
CYLINDER HEADQG
Components
EM-33

CAUTION:
+When installing camshaft and oil seal, lubricate contacting
surfaces with new engine oil.
+When tightening cylinder head bolts, camshaft sprocket
bolts and camshaft bracket bolts, lubricate bolt threads
and seat surfaces with new engine oil.
+Attach tags to valve lifters so as not to mix them up.
SEM869F
RemovalNJEM00171. Drain engine coolant from radiator and cylinder block.
Be careful not to spill coolant on drive belts.
2. Release fuel pressure.
Refer to EC-38, ªFuel Pressure Releaseº.
3. Remove drive belts.
4. Remove air duct to intake manifold collector.
5. Remove front undercovers.
6. Remove front exhaust tube.
SEM870F
7. Disconnect vacuum hoses, fuel hoses, water hoses, wires,
harness, connectors and so on.
8. Remove intake manifold rear supports.
9. Remove exhaust manifold.
10. Remove ignition coils.
11. Remove spark plugs.
SEM102G
12. Remove rocker cover bolts in numerical order as shown in the
figure.
SEM872F
13. Set No. 1 piston at TDC on its compression stroke.
CYLINDER HEADQG
Components (Cont'd)
EM-34

SEM873F
+Rotate crankshaft until mating mark on camshaft sprocket
is set at position indicated in figure at left.
SEM874F
14. Remove camshaft position sensor (PHASE).
+Do not allow any magnetic materials to contact the cam-
shaft position sensor (PHASE).
+Be careful not to damage sensor.
15. Remove cylinder head front cover.
SEM875F
16. Remove timing chain guide from camshaft bracket.
17. Attach a suitable stopper pin to chain tensioner.
18. Remove chain tensioner.
SEM876F
19. Remove camshaft sprocket bolts.
+Apply paint to timing chain and cam sprockets for align-
ment during installation.
20. Remove camshaft sprockets.
SEM877F
21. Remove camshaft brackets and camshafts.
+Apply I.D. marks to brackets to ensure correct reassembly.
+Bolts should be loosened in two or three steps.
CYLINDER HEADQG
Removal (Cont'd)
EM-35

SEM878F
22. Remove cylinder head bolts.
23. Remove cylinder head with manifolds.
+Head warpage or cracking could result from removing in
incorrect order.
+Cylinder head bolts should be loosened in two or three
steps.
SEM914F
DisassemblyNJEM00181. Remove valve components with Tool.
2. Remove valve oil seal with a suitable tool.
SEM915F
InspectionNJEM0019CYLINDER HEAD DISTORTIONNJEM0019S01+Clean surface of cylinder head.
+Use a reliable straightedge and feeler gauge to check the flat-
ness of cylinder head mating surface.
+Check along six positions shown in figure.
Head surface flatness:
Standard: Less than 0.03 mm (0.0012 in)
Limit: 0.1 mm (0.004 in)
If beyond the specified limit, replace or resurface it.
Resurfacing limit:
The limit for cylinder head resurfacing is determined by the
amount of cylinder block resurfacing.
Amount of cylinder head resurfacing is ªAº.
Amount of cylinder block resurfacing is ªBº.
The maximum limit is as follows:
A + B = 0.2 mm (0.008 in)
After resurfacing cylinder head, check that camshaft rotates freely
by hand. If resistance is felt, replace cylinder head.
Nominal cylinder head height:
117.8 - 118.0 mm (4.638 - 4.646 in)
CAMSHAFT VISUAL CHECKNJEM0019S02Check camshaft for scratches, seizure and wear.
CYLINDER HEADQG
Removal (Cont'd)
EM-36

SEM154D
CAMSHAFT RUNOUTNJEM0019S031. Measure camshaft runout at the center journal.
Runout (Total indicator reading):
Standard
Less than 0.02 mm (0.0008 in)
Limit
0.1 mm (0.004 in)
2. If it exceeds the limit, replace camshaft.
SEM916F
CAMSHAFT CAM HEIGHTNJEM0019S041. Measure camshaft cam height.
Standard cam height:
Intake
40.610 - 40.800 mm (1.5988 - 1.6063 in)
Exhaust
40.056 - 40.246 mm (1.5770 - 1.5845 in)
Cam wear limit:
0.20 mm (0.0079 in)
2. If wear is beyond the limit, replace camshaft.
SEM917F
CAMSHAFT JOURNAL CLEARANCENJEM0019S051. Install camshaft bracket and tighten bolts to the specified
torque.
2. Measure inner diameter of camshaft bearing.
Standard inner diameter:
No. 1 bearing
28.000 - 28.021 mm (1.1024 - 1.1032 in)
No. 2 to No. 5 bearings
24.000 - 24.021 mm (0.9449 - 0.9457 in)
SEM156D
3. Measure outer diameter of camshaft journal.
Standard outer diameter:
No. 1 journal
27.935 - 27.955 mm (1.0998 - 1.1006 in)
No. 2 to No. 5 journals
23.935 - 23.955 mm (0.9423 - 0.9431 in)
4. If clearance exceeds the limit, replace camshaft and/or cylin-
der head.
Camshaft journal clearance:
Standard
0.045 - 0.086 mm (0.0018 - 0.0034 in)
Limit
0.15 mm (0.0059 in)
CYLINDER HEADQG
Inspection (Cont'd)
EM-37

SEM918F
CAMSHAFT END PLAYNJEM0019S061. Install camshaft in cylinder head. Refer to EM-45.
2. Measure camshaft end play.
Camshaft end play:
Standard
0.115 - 0.188 mm (0.0045 - 0.0074 in)
Limit
0.20 mm (0.0079 in)
3. If limit is exceeded, replace camshaft and remeasure end play.
+If limit is still exceeded after replacing camshaft, replace
cylinder head.
SEM919F
CAMSHAFT SPROCKET RUNOUTNJEM0019S071. Install sprocket on camshaft.
2. Measure camshaft sprocket runout.
Runout (Total indicator reading):
Limit 0.15 mm (0.0059 in)
3. If it exceeds the limit, replace camshaft sprocket.
SEM345D
VALVE GUIDE CLEARANCENJEM0019S081. Measure valve deflection as shown in figure. (Valve and valve
guide wear the most in this direction.)
Valve deflection limit (Dial gauge reading):
Intake & Exhaust
0.2 mm (0.008 in)
SEM938C
2. If it exceeds the limit, check valve to valve guide clearance.
a. Measure valve stem diameter and valve guide inner diameter.
b. Calculate valve to valve guide clearance.
Valve to valve guide clearance = valve guide inner diam-
eter þ valve stem diameter.
c. Check that clearance is within specification.
CYLINDER HEADQG
Inspection (Cont'd)
EM-38

Unit: mm (in)
Standard Limit
Intake0.020 - 0.050
(0.0008 - 0.0020)0.1 (0.004)
Exhaust0.040 - 0.070
(0.0016 - 0.0028)0.1 (0.004)
+If it exceeds the limit, replace valve and remeasure clearance.
+If limit is still exceeded after replacing valve, replace valve
guide.
SEM008A
VALVE GUIDE REPLACEMENTNJEM0019S091. To remove valve guide, heat cylinder head to 110 to 130ÉC
(230 to 266ÉF).
SEM931C
2. Drive out valve guide with a press [under a 20 kN (2 ton, 2.2
US ton, 2.0 Imp ton) pressure] or hammer and suitable tool.
SEM932C
3. Ream cylinder head valve guide hole.
Valve guide hole diameter
(for service parts):
Intake & Exhaust
9.685 - 9.696 mm (0.3813 - 0.3817 in)
MEM096A
4. Heat cylinder head to 110 to 130ÉC (230 to 266ÉF) and press
service valve guide into cylinder head.
Projection ªLº:
11.5 - 11.7 mm (0.453 - 0.461 in)
CYLINDER HEADQG
Inspection (Cont'd)
EM-39

SEM932C
5. Ream valve guide.
Finished size:
Intake & Exhaust
5.500 - 5.515 mm (0.2165 - 0.2171 in)
SEM934C
VALVE SEATSNJEM0019S10Check valve seats for pitting at contact surface. Resurface or
replace if excessively worn.
+Before repairing valve seats, check valve and valve guide
for wear. If they have worn, replace them. Then correct
valve seat.
+Use both hands to cut uniformly.
SEM795A
REPLACING VALVE SEAT FOR SERVICE PARTSNJEM0019S111. Bore out old seat until it collapses. Set machine depth stop so
that boring cannot contact the bottom face of seat recess in
cylinder head.
2. Ream cylinder head recess.
Reaming bore for service valve seat
Oversize [0.5 mm (0.020 in)]:
Refer to SDS, EM-70.
Use the valve guide center for reaming to ensure valve seat
will have the correct fit.
SEM008A
3. Heat cylinder head to 110 to 130ÉC (230 to 266ÉF).
4. Press fit valve seat until it seats on the bottom.
SEM892B
5. Cut or grind valve seat using suitable tool to the specified
dimensions as shown in SDS, EM-70.
6. After cutting, lap valve seat with abrasive compound.
7. Check valve seating condition.
Seat face angle ªaº:
44É53¢- 45É07¢
Contacting width ªWº:
Intake
1.06 - 1.34 mm (0.0417 - 0.0528 in)
Exhaust
1.20 - 1.68 mm (0.0472 - 0.0661 in)
CYLINDER HEADQG
Inspection (Cont'd)
EM-40

AEM343
8. Use a depth gauge to measure the distance ªLº between the
mounting surface of the cylinder head spring seat and the
valve stem end. If the distance is shorter than specified, repeat
step 5 above to correct it. If the distance is longer, replace the
valve seat.
Valve seat resurface limit:
Intake
35.95 - 36.55 mm (1.4154 - 1.4390 in)
Exhaust
35.92 - 36.52 mm (1.4142 - 1.4378 in)
SEM188A
VALVE DIMENSIONSNJEM0019S12Check dimensions of each valve. Refer to SDS, EM-66 for dimen-
sions.
When valve head has been worn down to 0.5 mm (0.020 in) in
margin thickness, replace valve.
Grinding allowance for valve stem tip is 0.2 mm (0.008 in) or
less.
SEM288A
VALVE SPRINGNJEM0019S13SquarenessNJEM0019S13011. Measure dimension ªSº.
Out-of-square ªSº:
Less than 1.80 mm (0.0709 in)
2. If it exceeds the limit, replace spring.
EM113
PressureNJEM0019S1302Check valve spring pressure at specified spring height.
Pressure:
Standard
370.0 N (37.73 kg, 83.19 lb) at 23.64 mm (0.9307 in)
Limit
More than 347.8 N (35.46 kg, 78.19 lb) at 23.64 mm
(0.9307 in)
If it exceeds the limit, replace spring.
SEM160D
VALVE LIFTER AND VALVE SHIMNJEM0019S161. Check contact and sliding surfaces for wear or scratches.
CYLINDER HEADQG
Inspection (Cont'd)
EM-41

SEM161D
2. Check diameter of valve lifter and valve lifter guide bore.
Valve lifter outside diameter:
29.960 - 29.975 mm (1.1795 - 1.1801 in)
SEM920F
Lifter guide inside diameter:
30.000 - 30.021 mm (1.1811 - 1.1819 in)
Clearance between valve lifter and valve lifter guide:
0.025 - 0.065 mm (0.0010 - 0.0026 in)
If it exceeds the limit, replace valve lifter or cylinder head which
exceeds the standard diameter tolerance.
SEM921F
Valve ClearanceNJEM0041CHECKINGNJEM0041S01Check valve clearance while engine is warm and not running.
1. Remove rocker cover.
2. Remove all spark plugs.
3. Set No. 1 cylinder at TDC on its compression stroke.
+Align pointer with TDC mark on crankshaft pulley.
+Check that valve lifters on No. 1 cylinder are loose and valve
lifters on No. 4 are tight.
+If not, turn crankshaft one revolution (360É) and align as
described above.
SEM922F
4. Check only those valves shown in the figure.
CYLINDER HEADQG
Inspection (Cont'd)
EM-42