Nissan Murano Z50 (2003 year). Manual

CAMSHAFT

EM-73

Revision; 2004 April

2003 Murano

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

Put V block on precise flat bed, and support No. 2 and No. 4 journal of camshaft.

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

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.

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

Revision; 2004 April

2003 Murano

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).

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

INT

Pink

EXH

Yes

Orange

INT

Pink

EXH

Yes

Orange

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

GI-

Tighten the camshaft brackets in the following steps, in numeri-
cal order as shown.

Tighten No. 7 to 10, then tighten No.1 to 6 in order as shown.

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

Revision; 2004 April

2003 Murano

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.

Inspect and adjust valve clearance. Refer to

EM-77, "Valve Clearance"

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.

Remove RH and LH rocker covers with power tool.
Refer to

EM-43, "ROCKER COVER"

Measure valve clearance as below:

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

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.

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

Revision; 2004 April

2003 Murano

●

No.3 cylinder at compression TDC

Turn crankshaft pulley clockwise by 240

from the position of

No. 5 cylinder at compression TDC.

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.

Remove camshaft. Refer to

EM-70, "Removal and Installation"

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

Measure the center thickness of the removed valve lifters with a
micrometer.

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).

Install the selected valve lifter.

Install camshaft.

Manually turn crankshaft pulley a few turns.

Check that valve clearances for cold engine are within specifications by referring to the specified values.

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

KBIA0057E

Valve lifter thickness calculation:

t = t

+ (C

- C

)

= Valve lifter thickness to be replaced

= Removed valve lifter thickness

= Measured valve clearance

= Standard valve clearance:

Intake

: 0.30 mm (0.012 in)*

Exhaust

: 0.33 mm (0.013 in)*

*: Approximately 20

C (68

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

Revision; 2004 April

2003 Murano

OIL SEAL

PFP:00100

Removal and Installation of Valve Oil Seal

ABS003MJ

REMOVAL

Remove camshaft relating to valve oil seal to be removed. Refer to

EM-70, "CAMSHAFT"

Remove valve lifters. Refer to

EM-70, "CAMSHAFT"

Turn crankshaft until the cylinder requiring new oil seals is at TDC. This will prevent the valve from drop-
ping into the cylinder.

Using valve spring compressor (special service tool), remove
valve collet. Then remove valve spring and valve spring seat.

Remove valve oil seal using valve oil seal puller (special service
tool).

INSTALLATION

Apply engine oil on new valve oil seal joint and seal lip.

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

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

Remove the following parts:

●

Splash guard (RH)

●

Front RH road wheel and engine side cover

●

Drive belts; Refer to

EM-11, "DRIVE BELTS"

●

Rear cover plate; Refer to

EM-26, "OIL PAN AND OIL STRAINER"

Remove crankshaft pulley as follows:

Loosen crankshaft pulley mounting bolt.

CAUTION:

Exercise care not to damage signal plate.

Locate bolt seating surface at 10 mm (0.39 in) from its original
position. Remove crankshaft pulley.

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

Revision; 2004 April

2003 Murano

INSTALLATION

Apply engine oil on new front oil seal.

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.

Perform steps in the reverse order of removal for the following operations.

Removal and Installation of Rear Oil Seal

ABS003ML

REMOVAL

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"

Install engine slingers. Refer to

EM-95, "ENGINE ASSEMBLY"

install engine sub-attachment to right side of cylinder block, then lift engine, and mount it onto the engine
stand. Refer to

EM-100, "CYLINDER BLOCK"

Remove drive plate.

Remove upper oil pan. Refer to

EM-26, "OIL PAN AND OIL STRAINER"

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

Remove old liquid gasket on mating surface of cylinder block and oil pan using scraper.

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

GI-

●

Assembly should be done within 5 minutes after coating.

Install rear oil seal retainer to cylinder block.

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

Warm up engine thoroughly. Then, stop it.

Release fuel pressure. Refer to

EC-66, "FUEL PRESSURE RELEASE"

Disconnect fuel pump fuse to avoid fuel injection during mea-
surement.

Remove engine cover. Refer to

EM-16, "INTAKE MANIFOLD

COLLECTOR"

Remove ignition coil and spark plug from each cylinder.
Refer to

EM-35, "IGNITION COIL"

and

EM-36, "SPARK PLUG

(PLATINUM-TIPPED TYPE)"

Connect engine tachometer (not required in use of CONSULT-
ll).

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.

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

, 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

Revision; 2004 April

2003 Murano

●

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.

After inspection is completed, install removed parts.

Removal and Installation

ABS003MN

REMOVAL

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-20, "INTAKE MANIFOLD"

●

Exhaust manifold. Refer to

EM-22, "EXHAUST MANIFOLD AND THREE WAY CATALYST"

●

Water inlet and thermostat assembly. Refer to

CO-24, "THERMOSTAT AND THERMOSTAT HOUS-

ING"

●

Water outlet and water piping. Refer to

CO-26, "WATER OUTLET AND WATER PIPING"

Remove camshaft. Refer to

EM-70, "CAMSHAFT"

Remove cylinder head loosening bolts in reverse order shown in
the figure.

Cylinder head (LH bank)

Cylinder head bolt

Cylinder head (RH bank)

Cylinder head gasket

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

Install cylinder head gasket.

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.

Install cylinder head follow the steps below to tighten cylinder
head bolts in the order shown in figure.

Tighten all bolts to 98.1 N·m (10 kg-m, 72 ft-lb).

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.

Tighten all bolts to 34.3 to 44.1 N·m (3.5 to 4.4 kg-m, 26 to 32 ft-
lb).

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

Revision; 2004 April

2003 Murano

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.

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.

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

Remove spark plug with spark plug wrench (commercial service tool).

Remove valve lifter.

●

Mark position on valve lifter for assembly.

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.

Remove valve spring retainer and valve spring.

Push valve stem to combustion chamber side, and remove
valve.

●

Inspect valve guide clearance before removal. Refer to

EM-

89, "VALVE GUIDE CLEARANCE"

●

Mark position on valve for assembly.

Valve lifter

Valve collet

Valve spring retainer

Valve spring

Valve oil seal

Valve spring seat

Valve guide

Spark plug

Spark plug tube

10. Cylinder head (RH bank)

11.

Valve seat

12. Valve (EXH)

13. Valve (INT)

14. Cylinder head (LH bank)

PBIC1594E

PBIC1649E

Nissan Murano Z50 (2003 year). Manual - part 129