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EM-64Revision: June 2006
CYLINDER HEAD
2007 Versa
Water outlet; Refer to CO-20, "WATER OUTLET AND WATER CONTROL VALVE" .
Rocker cover; Refer to EM-30, "IGNITION COIL, SPARK PLUG AND ROCKER COVER" .
Front cover, timing chain; Refer to EM-37, "TIMING CHAIN" .
Camshaft; Refer to EM-47, "CAMSHAFT" .
6. Remove cylinder head.
Loosen bolts in reverse order as shown.
Using TORX socket (size E18), loosen cylinder head bolts.
7. Remove cylinder head gasket.
INSPECTION AFTER REMOVAL
Cylinder Head Bolts Outer Diameter
Cylinder head bolts are tightened by plastic zone tightening
method. Whenever the size difference between “d1” and “d2”
exceeds the limit, replace them with a new one.
If reduction of outer diameter appears in a position other than
“d2”, use it as “d2” point.
Cylinder Head Distortion
NOTE:
When performing this inspection, cylinder block distortion should be also checked. Refer to EM-98, "
CYLIN-
DER BLOCK TOP SURFACE DISTORTION" .
1. Wipe off engine oil and remove water scale (like deposit), gasket, sealant, carbon, etc. with a scraper.
CAUTION:
Use utmost care not to allow gasket debris to enter passages for engine oil or water.
2. At each of several locations on bottom surface of cylinder head,
measure the distortion in six directions using straightedge (A)
and feeler gauge (B).
If it exceeds the limit, replace cylinder head.
: Engine front
PBIC3206J
Limit (“d1” – “d2”): 0.15 mm (0.0059 in)
PBIC3994E
Limit: 0.1 mm (0.004 in)
PBIC3207J
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CYLINDER HEAD
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INSTALLATION
1. Install cylinder head gasket.
2. Apply new engine oil to threads and seating surface of bolts.
CAUTION:
If cylinder head bolts re-used, check their outer diameters before installation. Refer to EM-64, "
Cyl-
inder Head Bolts Outer Diameter" .
3. Install cylinder head, follow the steps below to tighten cylinder
head bolts in numerical order as shown.
: Engine front
CAUTION:
Check and confirm the tightening angle by using Tool (A) or
protractor. Never judge by visual inspection without the
tool.
4. Installation of the remaining components is in the reverse order of removal.Step a : 40 N·m (4.1 kg-m, 30 ft-lb)
Step b : 100° clockwise
Step c : Loosen to 0 N·m in the reverse order of
tightening.
Step d : 40 N·m (4.1 kg-m, 30 ft-lb)
Step e : 100° clockwise
Step f : 100° clockwise
Tool number : KV10112100 (BT-8653-A)
PBIC3206J
PBIC3208J
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EM-66Revision: June 2006
CYLINDER HEAD
2007 Versa
ComponentsEBS00U7T
Disassembly and AssemblyEBS00U7U
DISASSEMBLY
1. Remove spark plug using suitable tool.
2. Remove valve lifter.
Identify installation positions, and store them without mixing them up.
3. Remove valve collet.
1. Valve collet 2. Valve spring retainer 3.Va l ve sp r in g ( E XH )
(with valve spring seat)
4. Valve oil seal 5. Valve guide (EXH) 6. Valve seat (EXH)
7. Valve (EXH) 8. Valve (INT) 9. Valve seat (INT)
10. Cylinder head 11. Valve guide (INT) 12. Spark plug
13.Va l v e s p r i n g (I N T )
(with valve spring seat)
A. Refer to EM-69
B. Refer to EM-70
PBIC3543J
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Compress valve spring using Tool, attachment and adapter
(A). Remove valve collet using a suitable magnet hand.
CAUTION:
When working, be careful not to damage valve lifter holes.
4. Remove valve spring retainer and valve spring (with valve spring seat).
CAUTION:
Never remove valve spring seat from valve spring.
5. Push valve stem to combustion chamber side, and remove valve.
NOTE:
Identify installed positions, and store them without mixing them up.
6. Remove valve oil seal using Tool (A).
7. When valve seat must be replaced, refer to EM-70, "
VALVE SEAT REPLACEMENT" to removal.
8. When valve guide must be replaced, refer to EM-69, "
VALVE GUIDE REPLACEMENT" to removal.
ASSEMBLY
1. Install valve guide if removed. Refer to EM-69, "VALVE GUIDE REPLACEMENT" .
2. Install valve seat if removed. Refer to EM-70, "
VALVE SEAT REPLACEMENT" .
3. Install valve oil seal.
Install with a valve oil seal using Tool (A) to match dimension
as shown.
NOTE:
Dimension “H” is height that measured before installing valve
spring (with valve spring seat).
4. Install valve.
Install larger diameter to intake side.Tool number : KV101092S0 (J-26336-B)
PBIC3209J
Tool number : KV10107902 (J-38959)
PBIC3210J
Tool number : KV10115600 (J-38958)
Height “H” : 15.1 - 15.7 mm (0.594 - 0.618 in)
PBIC3 211 J
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EM-68Revision: June 2006
CYLINDER HEAD
2007 Versa
5. Install valve spring (with valve spring seat).
Install smaller pitch (valve spring seat side) to cylinder head
side (B).
Confirm identification color (A) of valve spring.
6. Install valve spring retainer.
7. Install valve collet.
Compress valve spring using Tool (A). Install valve collet with a magnet hand.
CAUTION:
When working, be careful not to damage valve lifter
holes.
Tap valve stem edge lightly with a plastic hammer after instal-
lation to check its installed condition.
8. Install valve lifter.
Install it in the original position.
9. Install spark plug using suitable tool.
Inspection After DisassemblyEBS00U7V
VALVE DIMENSIONS
Check dimensions of each valve. For dimensions, refer to EM-106, "Valve Dimensions" .
If dimensions are out of the standard, replace valve.
VALVE GUIDE CLEARANCE
Valve Stem Diameter
Measure the diameter of valve stem with a micrometer (A).
Valve Guide Inner Diameter
Measure the inner diameter of valve guide with a bore gauge.
Valve Guide Clearance
(Valve guide clearance) = (Valve guide inner diameter) – (Valve stem diameter).
1 : Valve spring seat (Do not remove from valve spring.)
Intake : White
Exhaust : Orange
PBIC3462J
Tool number : KV101092S0 (J-26336 B)
PBIC3209J
Standard
Intake : 5.465 - 5.480 mm (0.2152 - 0.2157 in)
Exhaust : 5.455 - 5.470 mm (0.2148 - 0.2154 in)
PBIC3213J
Standard
: 5.500 - 5.518 mm (0.2165 - 0.2172 in)
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If it exceeds the limit, replace valve guide and/or valve.
VALVE GUIDE REPLACEMENT
When valve guide is removed, replace with oversized [0.2 mm (0.008 in)] valve guide.
1. To remove valve guide, heat cylinder head to 110° to 130°C
(230° to 266°F) by soaking in heated oil (A).
2. Drive out valve guide using suitable tools.
CAUTION:
Cylinder head contains heat, when working, wear protective
equipment to avoid getting burned.
3. Ream cylinder head valve guide hole using suitable tool (A).Valve guide clearance:
Standard
Intake : 0.020 - 0.053 mm (0.0008 - 0.0021 in)
Exhaust : 0.030 - 0.063 mm (0.0012 - 0.0025 in)
Limit
: 0.1 mm (0.004 in)
PBIC3214J
SEM 93 1C
Valve guide hole diameter (for service parts):
: 9.675 - 9.696 mm (0.3809 - 0.3817 in)
PBIC3215J
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EM-70Revision: June 2006
CYLINDER HEAD
2007 Versa
4. Heat cylinder head to 110° to 130°C (230° to 266°F) by soaking
in heated oil (A).
5. Press valve guide (1) from camshaft side to dimensions as
shown.
CAUTION:
Cylinder head contains heat, when working, wear protective
equipment to avoid getting burned.
6. Apply reamer finish to valve guide using suitable tool (A).
VALVE SEAT CONTACT
After confirming that the dimensions of valve guides and valves are within specifications, perform this pro-
cedure.
Apply prussian blue (or white lead) onto contacting surface of valve seat to check the condition of the
valve contact on the surface.
Check if the contact area band is continuous all around the cir-
cumference.
If not, grind to adjust valve fitting and check again. If the contact-
ing surface still has NG conditions even after the re-check,
replace valve seat.
VALVE SEAT REPLACEMENT
When valve seat is removed, replace with oversized [0.5 mm (0.020 in)] valve seat.
1. Bore out old seat until it collapses. Boring should not continue beyond the bottom face of the seat recess
in cylinder head. Set the machine depth stop to ensure this. Refer to EM-109, "
Valve Seat" .
PBIC3214J
2 : Cylinder head
Projection “H” : 13.35 - 13.65 mm (0.526 - 0.537 in)
PBIC3217J
Standard
: 5.500 - 5.518 mm (0.2165 - 0.2172 in)
PBIC3215J
SBIA0322E
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2. Ream cylinder head (1) recess diameter for service valve seat.
Be sure to ream in circles concentric to the valve guide center.
This will enable valve seat to fit correctly.
3. Heat cylinder head to 110° to 130°C (230° to 266°F) by soaking
in heated oil (A).
4. Provide valve seats cooled well with dry ice. Press-fit valve seat into cylinder head.
CAUTION:
Never touch cold valve seats directly.
Cylinder head contains heat, when working, wear protective equipment to avoid getting burned.
5. Using valve seat cutter set or valve seat grinder, finish valve
seat to the specified dimensions. For dimensions, refer to EM-
109, "Valve Seat" .
CAUTION:
When using valve seat cutter, firmly grip the cutter handle
with both hands. Then, press on the contacting surface all
around the circumference to cut in a single drive. Improper
pressure on with the cutter or cutting many different times
may result in stage valve seat.
6. Using compound, grind to adjust valve fitting.
7. Check again for normal contact. Refer to EM-70, "
VALVE SEAT CONTACT" .
VALVE SPRING SQUARENESS
Set try square along the side of valve spring and rotate the
spring. Measure the maximum clearance between the top of
valve spring and try square.
CAUTION:
Never remove valve spring seat from valve spring.
If it exceeds the limit, replace valve spring (with valve spring
seat).
2 : Valve seat
Oversize [0.5 mm (0.020 in)]
Intake : 35.200 - 35.227 mm (1.3858 - 1.3869 in)
Exhaust : 29.200 - 29.227 mm (1.1496 - 1.1507 in)
PBIC3218J
PBIC3214J
SEM 93 4C
Limit: 1.9 mm (0.075 in)
PBIC0080E