Nissan Murano Z50 (2003 year). Manual — part 129
CAMSHAFT
EM-73
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Inner Diameter of Camshaft Bracket
●
Tighten camshaft bracket bolt with specified torque.
●
Using inside micrometer, measure inner diameter “A” of cam-
shaft bracket.
Calculation of Camshaft Journal Clearance
●
(Journal clearance) = (inner diameter of camshaft bracket) –
(outer diameter of camshaft journal).
●
When out of the limit, replace either or both camshaft and cylinder head.
NOTICE:
Inner diameter of camshaft bracket is manufactured together with cylinder head. Replace the whole cylin-
der head assembly.
Camshaft End Play
●
Install dial gauge in thrust direction on front end of camshaft.
Measure end play of dial gauge when camshaft is moved for-
ward/backward (in direction to axis).
●
When out of the limit, replace with new camshaft and measure
again.
●
When out of the limit again, replace with new cylinder head.
Camshaft Sprocket Runout
1.
Put V block on precise flat bed, and support No. 2 and No. 4 journal of camshaft.
2.
Using dial gauge and measure camshaft sprocket runout. (Total
indicator reading)
●
If it exceeds the limit, replace camshaft sprocket.
Standard inner diameter:
No. 1
: 26.000 - 26.021 mm (1.0236 - 1.0244 in)
No. 2, 3, 4
: 23.500 - 23.521 mm (0.9252 - 0.9260 in)
Standard:
No. 1
: 0.045 - 0.086 mm (0.0018 - 0.0034 in)
No. 2, 3, 4
: 0.035 - 0.076 mm (0.0014 - 0.0030 in)
Limit
: 0.15 mm (0.0059 in)
PBIC1645E
Standard
: 0.115 - 0.188 mm (0.0045 - 0.0074 in)
Limit
: 0.24 mm (0.0094 in)
SEM864E
Limit
: 0.15 mm (0.0059 in)
PBIC0930E
EM-74
CAMSHAFT
Revision; 2004 April
2003 Murano
Valve Lifter
Check if surface of valve lifter has any wear or cracks.
●
If anything above is found, replace valve lifter.
Valve Lifter Clearance
Outer Diameter of Valve Lifter
●
Measure outer diameter of valve lifter.
Valve Lifter Hole Diameter
●
Using inside micrometer, measure diameter of valve lifter hole of
cylinder head.
Calculation of Valve Lifter Clearance
●
(Valve lifter clearance) = (hole diameter of valve lifter) – (outer
diameter of valve lifter).
●
When out of specified range, referring to each specification of outer and inner diameter, replace either or
both valve lifter and cylinder head.
INSTALLATION
1.
Install secondary chain tensioners on both sides of cylinder
head.
●
Install chain tensioner with its stopper pin attached.
●
Install tensioner with sliding part facing downward on right-
side cylinder head, and with sliding part facing upward on left-
side cylinder head.
●
Install O-ring as shown.
2.
Install valve lifter.
●
Install it in the original position.
KBIA0182E
Valve lifter outer diameter (Intake and exhaust)
: 33.977 - 33.987mm (1.3377 - 1.3381 in)
JEM798G
Standard (Intake and exhaust)
: 34.000 - 34.016 mm (1.3386 - 1.3392 in)
Standard (Intake and exhaust)
: 0.013 - 0.039 mm (0.0005 - 0.0015 in)
SEM867E
SEM947G
CAMSHAFT
EM-75
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3.
Install camshafts.
●
Install camshaft with dowel pin attached to its front end face
on the exhaust side.
●
Follow your identification marks made during removal, or fol-
low the identification marks that are present on the new cam-
shafts for proper placement and direction.
●
Install camshaft so that dowel pin hole and dowel pin on front
end face are positioned as shown in figure. (No. 1 cylinder
TDC on its compression stroke)
NOTE:
Large- and small-pin holes are located on front end face of
intake camshaft, at intervals of 180
°
. Face small dia. side pin
hole upward (in cylinder head upper face direction).
4.
Install camshaft brackets.
●
Remove foreign material completely from camshaft bracket
backside and from cylinder head installation face.
●
Install camshaft bracket in original position and direction as
shown in figure.
KBIA1071E
Bank
INT/EXH
Dowel pin
Paint marks
ID mark
M1
M2
RH
INT
No
Pink
No
RE
EXH
Yes
No
Orange
RE
LH
INT
No
Pink
No
LH
EXH
Yes
No
Orange
LH
KBIA1009E
KBIA1072E
SEM446G
EM-76
CAMSHAFT
Revision; 2004 April
2003 Murano
●
Install No.2 to 4 camshaft brackets aligning the stamp marks
as shown.
NOTE:
There are no identification marks indicating left and right for
No. 1 camshaft bracket.
●
Apply sealant to mating surface of No.1 camshaft bracket as
shown on RH and LH banks.
●
Use Genuine RTV Silicone Sealant or equivalent. Refer to
46, "RECOMMENDED CHEMICAL PRODUCTS AND SEAL-
ANTS"
.
5.
Tighten the camshaft brackets in the following steps, in numeri-
cal order as shown.
a.
Tighten No. 7 to 10, then tighten No.1 to 6 in order as shown.
b.
Tighten all bolts in the numerical order as shown.
c.
Tighten all bolts in the numerical order as shown.
SEM564G
PBIC0915E
: 1.96 N·m (0.2 kg-m, 17 in-lb)
: 5.88 N·m (0.6 kg-m, 52 in-lb)
: 9.02 - 11.8 N·m (0.92 - 1.20 kg-m, 80 - 104 in-lb)
PBIC0794E
CAMSHAFT
EM-77
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6.
Measure difference in levels between front end faces of No. 1
camshaft bracket and cylinder head.
●
If measurement is outside the specified range, re-install cam-
shaft and camshaft bracket.
7.
Inspect and adjust valve clearance. Refer to
.
8.
Install in the reverse order of removal after this step.
Valve Clearance
ABS003MI
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 RH and LH rocker covers with power tool.
Refer to
2.
Measure valve clearance as below:
a.
Set No.1 cylinder at TDC of its compression stroke.
●
Align crankshaft pulley timing mark (grooved line without
color) with timing indicator.
●
Check that No. 1 cylinder intake and exhaust cam nose is fac-
ing in direction shown in figure.
●
If not, rotate crankshaft pulley 360
°
clockwise (when viewed
from front).
Standard
: –0.14 to 0.14 mm (–0.0055 to 0.0055 in)
EMQ0044D
SEM713A
SEM918G
SEM418G
EM-78
CAMSHAFT
Revision; 2004 April
2003 Murano
b.
Using a feeler gauge, measure valve clearance.
*: Approximately 80
°
C (176
°
F) (Reference data)
●
No.1 cylinder at compression TDC
CAUTION:
If inspection was carried out with cold engine, check that
values with fully warmed up engine are still within specifi-
cations.
c.
Rotate crankshaft by 240
°
clockwise (when viewed from front) to
align No. 3 cylinder at TDC of its compression stroke.
NOTE:
Crankshaft pulley mounting bolt flange has a stamped line every
60
°
. They can be used as a guide to rotation angle.
Valve clearance standard:
Cold
Intake
: 0.26 - 0.34 mm (0.010 - 0.013 in)
Exhaust
: 0.29 - 0.37 mm (0.011 - 0.015 in)
Hot*
Intake
: 0.304 - 0.416 mm (0.012 - 0.016 in)
Exhaust
: 0.308 - 0.432 mm (0.012 - 0.016 in)
SEM139D
KBIA0185E
Measuring position (RH bank)
No.1 CYL.
No.3 CYL.
No.5 CYL.
No.1 cylinder at
TDC
EXH
×
INT
×
Measuring position (LH bank)
No.2 CYL.
No.4 CYL.
No.6 CYL.
No.1 cylinder at
TDC
INT
×
EXH
×
SEM893E
SEM751G
CAMSHAFT
EM-79
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No.3 cylinder at compression TDC
d.
Turn crankshaft pulley clockwise by 240
°
from the position of
No. 5 cylinder at compression TDC.
3.
For measurements that are outside the specified range, perform
adjustment below.
ADJUSTMENT
●
Perform adjustment depending on selected head thickness of valve lifter.
●
The specified valve lifter thickness is the dimension at normal temperatures. Ignore dimensional differ-
ences caused by temperature. Use the specifications for hot engine condition to adjust.
1.
Remove camshaft. Refer to
EM-70, "Removal and Installation"
2.
Remove the valve lifters at the locations that are outside the standard.
Measuring position (RH bank)
No.1 CYL.
No.3 CYL.
No.5 CYL.
No.3 cylinder at
TDC
EXH
×
INT
×
Measuring position (LH bank)
No.2 CYL.
No.4 CYL.
No.6 CYL.
No.3 cylinder at
TDC
INT
×
EXH
×
SEM894E
Measuring position (RH bank)
No.1 CYL.
No.3 CYL.
No.5 CYL.
No.5 cylinder at
TDC
EXH
×
INT
×
Measuring position (LH bank)
No.2 CYL.
No.4 CYL.
No.6 CYL.
No.5 cylinder at
TDC
INT
×
EXH
×
SEM958E
EM-80
CAMSHAFT
Revision; 2004 April
2003 Murano
3.
Measure the center thickness of the removed valve lifters with a
micrometer.
4.
Use the equation below to calculate valve lifter thickness for replacement.
●
Thickness of a new valve lifter can be identified by stamp
marks on the reverse side (inside the cylinder).
Stamp mark 788U or 788R indicates 7.88 mm (0.3102 in) in
thickness.
NOTE:
2 types of stamp marks are used for parallel setting and for
manufacturer identification.
Available thickness of valve lifter: 27 sizes with range 7.88 to 8.40 mm (0.3102 to 0.3307 in) in steps of
0.02 mm (0.0008 in) (when manufactured at factory).
5.
Install the selected valve lifter.
6.
Install camshaft.
7.
Manually turn crankshaft pulley a few turns.
8.
Check that valve clearances for cold engine are within specifications by referring to the specified values.
9.
After completing the repair, check valve clearances again with the specifications for warmed engine. Make
sure the values are within specifications.
Valve clearance:
Unit: mm (in)
*: Approximately 80
°
C (176
°
F)
KBIA0057E
Valve lifter thickness calculation:
t = t
1
+ (C
1
- C
2
)
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)*
*: Approximately 20
°
C (68
°
F)
KBIA0119E
Cold
Hot * (reference data)
Intake
0.26 - 0.34 (0.010 - 0.013)
0.304 - 0.416 (0.012 - 0.016)
Exhaust
0.29 - 0.37 (0.011 - 0.015)
0.308 - 0.432 (0.012 - 0.016)
OIL SEAL
EM-81
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OIL SEAL
PFP:00100
Removal and Installation of Valve Oil Seal
ABS003MJ
REMOVAL
1.
Remove camshaft relating to valve oil seal to be removed. Refer to
.
2.
Remove valve lifters. Refer to
3.
Turn crankshaft until the cylinder requiring new oil seals is at TDC. This will prevent the valve from drop-
ping into the cylinder.
4.
Using valve spring compressor (special service tool), remove
valve collet. Then remove valve spring and valve spring seat.
5.
Remove valve oil seal using valve oil seal puller (special service
tool).
INSTALLATION
1.
Apply engine oil on new valve oil seal joint and seal lip.
2.
Using valve oil seal drift (special service tool), press fit valve
seal to height “H” shown in figure.
NOTE:
Dimension “H”: Height measured before valve spring seat instal-
lation
3.
Perform steps in the reverse order of removal for the following
operations.
PBIC1649E
PBIC0884E
Intake and exhaust
: 14.3 - 14.9 mm (0.563 - 0.587 in)
PBIC0802E
EM-82
OIL SEAL
Revision; 2004 April
2003 Murano
Removal and Installation of Front Oil Seal
ABS003MK
REMOVAL
1.
Remove the following parts:
●
Splash guard (RH)
●
Front RH road wheel and engine side cover
●
Drive belts; Refer to
●
Rear cover plate; Refer to
EM-26, "OIL PAN AND OIL STRAINER"
2.
Remove crankshaft pulley as follows:
a.
Loosen crankshaft pulley mounting bolt.
CAUTION:
Exercise care not to damage signal plate.
b.
Locate bolt seating surface at 10 mm (0.39 in) from its original
position. Remove crankshaft pulley.
3.
Remove front oil seal using a suitable tool.
CAUTION:
Be careful not to damage front timing chain case and crank-
shaft.
SEM965F
SEM915E
SEM829E
OIL SEAL
EM-83
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INSTALLATION
1.
Apply engine oil on new front oil seal.
2.
Using a suitable drift, press fit until the height of front oil seal is level with the mounting surface.
●
Suitable drift: outer diameter 59 mm (2.32 in), inner diameter 49 mm (1.93 in).
CAUTION:
●
Press fit straight and avoid causing burrs or tilting the oil
seal.
3.
Perform steps in the reverse order of removal for the following operations.
Removal and Installation of Rear Oil Seal
ABS003ML
REMOVAL
1.
Remove engine assembly from vehicle, and separate front suspension member, transaxle and transfer
(AWD models) assembly from engine. Refer to
EM-95, "Removal and Installation"
2.
Install engine slingers. Refer to
.
3.
install engine sub-attachment to right side of cylinder block, then lift engine, and mount it onto the engine
stand. Refer to
.
4.
Remove drive plate.
5.
Remove upper oil pan. Refer to
EM-26, "OIL PAN AND OIL STRAINER"
.
6.
Use a seal cutter (special service tool) to cut away liquid gasket
and remove rear oil seal retainer.
CAUTION:
Be careful not to damage mounting surface.
NOTE:
Rear oil seal and retainer form a single part and are handled as
an assembly.
INSTALLATION
1.
Remove old liquid gasket on mating surface of cylinder block and oil pan using scraper.
2.
Apply liquid gasket to rear oil seal retainer using tube presser
(special service tool) as shown in the figure.
●
Use Genuine RTV Silicone Sealant or equivalent. Refer to
46, "RECOMMENDED CHEMICAL PRODUCTS AND SEAL-
ANTS"
●
Assembly should be done within 5 minutes after coating.
3.
Install rear oil seal retainer to cylinder block.
4.
Perform steps in the reverse order of removal for the following operations.
SEM715A
SEM830E
PBIC0922E
EM-84
CYLINDER HEAD
Revision; 2004 April
2003 Murano
CYLINDER HEAD
PFP:11041
On-Vehicle Service
ABS003MM
CHECKING COMPRESSION PRESSURE
1.
Warm up engine thoroughly. Then, stop it.
2.
Release fuel pressure. Refer to
EC-66, "FUEL PRESSURE RELEASE"
3.
Disconnect fuel pump fuse to avoid fuel injection during mea-
surement.
4.
Remove engine cover. Refer to
5.
Remove ignition coil and spark plug from each cylinder.
Refer to
and
6.
Connect engine tachometer (not required in use of CONSULT-
ll).
7.
Install compression tester with adapter onto spark plug hole.
●
Use compression gauge whose picking up end inserted to
spark plug hole is smaller than 20 mm (0.79 in) in diameter.
Otherwise, it may be caught by cylinder head during removal.
8.
With accelerator pedal fully depressed, turn ignition switch to
“START” for cranking. When the gauge pointer stabilizes, read
the compression pressure and engine rpm. Perform these steps
to check each cylinder.
Unit: kPa (kg/cm
2
, psi) /rpm
CAUTION:
Always use a fully changed battery to obtain specified engine speed.
●
If the engine speed is out of specified range, check battery liquid for proper gravity. Check engine
speed again with normal battery gravity.
●
If compression pressure is below minimum value, check valve clearances and parts associated with
combustion chamber (valve, valve seat, piston, piston ring, cylinder bore, cylinder head, cylinder head
gasket). After the checking, measure compression pressure again.
●
If some cylinders have 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, the piston rings may be worn out or damaged. Check
the piston rings and replace if necessary.
–
If the compression pressure remains at low level despite the addition of engine oil, the valves may be
malfunctioning. Check the valves for damage. Replace the valve or valve seat accordingly.
PBIB1375E
PBIC1186E
Standard
Minimum
Deference limit
between cylinders
1,275 (13.0, 185) / 300
981 (10.0, 142) / 300
98 (1.0, 14) / 300
SEM387C
CYLINDER HEAD
EM-85
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●
If two adjacent cylinders have respectively low compression pressure and their compression remains
low even after the addition of engine oil, the gaskets are leaking. In such a case, replace the cylinder
head gaskets.
9.
After inspection is completed, install removed parts.
Removal and Installation
ABS003MN
REMOVAL
1.
Remove the following components and related parts:
●
Fuel tube and fuel injector assembly. Refer to
EM-38, "FUEL INJECTOR AND FUEL TUBE"
.
●
Intake manifold. Refer to
●
EM-22, "EXHAUST MANIFOLD AND THREE WAY CATALYST"
●
Water inlet and thermostat assembly. Refer to
CO-24, "THERMOSTAT AND THERMOSTAT HOUS-
.
●
Water outlet and water piping. Refer to
CO-26, "WATER OUTLET AND WATER PIPING"
2.
Remove camshaft. Refer to
3.
Remove cylinder head loosening bolts in reverse order shown in
the figure.
1.
Cylinder head (LH bank)
2.
Cylinder head bolt
3.
Cylinder head (RH bank)
4.
Cylinder head gasket
5.
Oil level gauge
PBIC1187E
PBIC0798E
EM-86
CYLINDER HEAD
Revision; 2004 April
2003 Murano
INSPECTION AFTER REMOVAL
Outer Diameter of Cylinder Head Bolts
●
Cylinder head bolts are tightened by plastic zone tightening
method. Whenever the size difference between d1 and d2
exceeds the limit, replace them with new one.
●
If reduction of outer diameter appears in a position other than
d2, use it as d2 point.
INSTALLATION
1.
Install cylinder head gasket.
2.
Turn the crankshaft until No. 1 piston is set at TDC on the com-
pression stroke.
●
The crankshaft key should line up with the right bank cylinder
center line as shown.
3.
Install cylinder head follow the steps below to tighten cylinder
head bolts in the order shown in figure.
a.
Tighten all bolts to 98.1 N·m (10 kg-m, 72 ft-lb).
b.
Completely loosen to 0 N·m (0 kg-m, 0 ft-lb).
CAUTION:
In step “b”, loosen bolts in the reverse order of that indi-
cated in figure.
c.
Tighten all bolts to 34.3 to 44.1 N·m (3.5 to 4.4 kg-m, 26 to 32 ft-
lb).
d.
Turn all bolts 90 to 95 degrees clockwise [target: 90 degrees
(angle tightening)].
PBIC0799E
Limit (d1 - d2)
: 0.11 mm (0.0043 in)
SEM957E
SEM532G
PBIC0798E
CYLINDER HEAD
EM-87
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e.
Turn all bolts 90 to 95 degrees clockwise again [target: 90
degrees (angle tightening)].
CAUTION:
Check and confirm the tightening angle by using angle
wrench (special service tool). Avoid judgment by visual
inspection without the tool.
●
Check tightening angle indicated on the angle wrench indica-
tor plate.
4.
After installing cylinder head, measure distance between front
end faces of cylinder block and cylinder head (left and right
banks).
●
If measurement is outside the specified range, re-install cylin-
der head.
5.
Perform steps in reverse order of removal for the following operations.
PBIC0799E
PBIC0888E
Standard
: 14.1 - 14.9 mm (0.555 - 0.587 in)
EMQ0662D
EM-88
CYLINDER HEAD
Revision; 2004 April
2003 Murano
Disassembly and Assembly
ABS003MO
DISASSEMBLY
1.
Remove spark plug with spark plug wrench (commercial service tool).
2.
Remove valve lifter.
●
Mark position on valve lifter for assembly.
3.
Remove valve collet.
●
Compress valve spring with valve spring compressor (special
service tool). Remove valve collet with magnet hand.
CAUTION:
When working, take care not to damage valve lifter holes.
4.
Remove valve spring retainer and valve spring.
5.
Push valve stem to combustion chamber side, and remove
valve.
●
Inspect valve guide clearance before removal. Refer to
●
Mark position on valve for assembly.
1.
Valve lifter
2.
Valve collet
3.
Valve spring retainer
4.
Valve spring
5.
Valve oil seal
6.
Valve spring seat
7.
Valve guide
8.
Spark plug
9.
Spark plug tube
10. Cylinder head (RH bank)
11.
Valve seat
12. Valve (EXH)
13. Valve (INT)
14. Cylinder head (LH bank)
PBIC1594E
PBIC1649E
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