Nissan Murano Z51 (2008 year). Manual — part 178
CYLINDER HEAD
EM-113
< DISASSEMBLY AND ASSEMBLY >
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a.
Apply new engine oil on valve oil seal joint and seal lip.
b.
Install with the valve oil seal drift [SST: KV10115600 (J-38958)]
(A) press fit valve seal to height (b) shown in the figure.
NOTE:
Dimension: Height measured before valve spring seat installa-
tion.
4.
Install valve spring seat.
5.
Install valve.
• Install it in the original position.
NOTE:
Larger diameter valves are for intake side.
6.
Install valve spring (uneven pitch type).
• Install narrow pitch end (paint mark) to cylinder head side
(valve spring seat side).
7.
Install valve spring retainer.
8.
Install valve collet.
• Compress valve spring with the valve spring compressor [SST:
KV10116200 (J-26336-A)] (A), the attachment [SST:
KV10115900 (J-26336-20)] (C) and the adapter [SST:
KV10109220 ( — )] (B). Install valve collet with a magnet
hand.
CAUTION:
When working, take care not to damage valve lifter holes.
• Tap valve stem edge lightly with plastic hammer after installa-
tion to check its installed condition.
9.
Install valve lifter.
• Install it in the original position.
10. Install spark plug tube.
• Press-fit spark plug tube as follows:
a.
Remove old liquid gasket adhering to cylinder head mounting hole.
b.
Apply sealant to area within approximately 12 mm (0.47 in) from edge of spark plug tube press-fit side.
Use genuine high strength thread locking sealant or equivalent. Refer to
Chemical Products and Sealants"
Intake and exhaust
: 14.3 - 14.9 mm (0.563 - 0.587 in)
JPBIA0178ZZ
A
: Wide pitch
B
: Narrow pitch
C
: Paint mark
: Cylinder head side
Paint mark color: Blue
JPBIA0179ZZ
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c.
Using a drift, press-fit spark plug tube so that its height (A) is as
specified in the figure.
CAUTION:
• When press-fitting, take care not to deform spark plug
tube.
• After press-fitting, wipe off liquid gasket protruding onto
cylinder-head upper face.
11. Install spark plug with the spark plug wrench (commercial service tool).
Inspection
INFOID:0000000003304160
INSPECTION AFTER REMOVAL
Cylinder Head Bolts Outer Diameter
• Cylinder head bolts are tightened by plastic zone tightening
method. Whenever the size difference between (C) and (B)
exceeds the limit, replace them with new one.
• If reduction of outer diameter appears in a position other than (B),
use it as (B) point.
Cylinder Head Distortion
NOTE:
When performing this inspection, cylinder block distortion should be also checking. Refer to
.
1.
Using a scraper, wipe off oil, scale, gasket, sealant and carbon deposits from surface of cylinder head.
CAUTION:
Never allow gasket fragments to enter engine oil or engine coolant passages.
2.
At each of several locations on bottom surface of cylinder head,
measure the distortion in six directions (A), (B), (C), (D), (E), and
(F).
• If it exceeds the limit, replace cylinder head.
INSPECTION AFTER DISASSEMBLY
Valve Dimensions
• Check the dimensions of each valve. For the dimensions, refer to
.
• If dimensions are out of the standard, replace valve and check valve seat contact. Refer to “Valve Seat Con-
tact”.
Valve Guide Clearance
Valve Stem Diameter
B
: Genuine high strength thread locking sealant application area
Standard press-fit height: 37.7 - 38.7 mm (1.484 - 1.524 in)
JPBIA0181ZZ
A
: Measuring point
d
: 11 mm (0.43 in)
e
: 48 mm (1.89 in)
Limit [(C) - (B)]
: 0.11 mm (0.0043 in)
JPBIA0173ZZ
Limit
: Refer to
.
JPBIA0176ZZ
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CYLINDER HEAD
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• Measure the diameter of valve stem with micrometer (A).
Valve Guide Inner Diameter
• Measure the inner diameter of valve guide with bore gauge.
Valve Guide Clearance
• (Valve guide clearance) = (Valve guide inner diameter) – (Valve stem diameter)
• If the calculated value exceeds the limit, replace valve and/or valve guide. When valve guide must be
replaced, refer to
EM-110, "Disassembly and Assembly"
Valve Seat Contact
• After confirming that the dimensions of valve guides and valves are within the specifications, perform this
procedure.
• 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 circumference.
• If not, grind to adjust valve fitting and check again. If the contacting
surface still has “NG” conditions (B) even after the recheck,
replace valve seat. Refer to
EM-110, "Disassembly and Assem-
Valve Spring Squareness
• Set a try square (A) along the side of valve spring and rotate
spring. Measure the maximum clearance between the top of spring
and try square.
• If it exceeds the limit, replace valve spring.
Valve Spring Dimensions and Valve Spring Pressure Load
Standard
: Refer to
.
(Intake and exhaust)
Standard
: Refer to
.
(Intake and exhaust)
Valve guide clearance
: Refer to
.
Standard and limit (Intake and exhaust)
JPBIA0183ZZ
A
: OK
JPBIA0187ZZ
B
: Contact
Limit
: Refer to
.
JPBIA0189ZZ
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CYLINDER HEAD
• Check the valve spring pressure at specified spring height.
• If the installation load or load with valve open is out of the stan-
dard, replace valve spring.
INSPECTION AFTER INSTALLATION
Inspection for Leakage
The following are procedures for checking fluids leakage, lubricates leakage, and exhaust gases leakage.
• Before starting engine, check oil/fluid levels including engine coolant and engine oil. If less than required
quantity, fill to the specified level. Refer to
MA-15, "FOR NORTH AMERICA : Fluids and Lubricants"
(for
North America) or
MA-16, "FOR MEXICO : Fluids and Lubricants"
(for Mexico).
• Use procedure below to check for fuel leakage.
- Turn ignition switch “ON” (with engine stopped). With fuel pressure applied to fuel piping, check for fuel leak-
age at connection points.
- Start engine. With engine speed increased, check again for fuel leakage at connection points.
• Run engine to check for unusual noise and vibration.
• Warm up engine thoroughly to check there is no leakage of fuel, exhaust gases, or any oil/fluids including
engine oil and engine coolant.
• Bleed air from lines and hoses of applicable lines, such as in cooling system.
• After cooling down engine, again check oil/fluid levels including engine oil and engine coolant. Refill to the
specified level, if necessary.
Summary of the inspection items:
*: Transmission/transaxle/CVT fluid, power steering fluid, brake fluid, etc.
Standard (Intake and exhaust)
: Refer to
.
Free height
Installation height
Installation load
Height during valve open
Load with valve open
SEM113
Items
Before starting engine
Engine running
After engine stopped
Engine coolant
Level
Leakage
Level
Engine oil
Level
Leakage
Level
Other oils and fluid*
Level
Leakage
Level
Fuel
Leakage
Leakage
Leakage
Exhaust gases
—
Leakage
—
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CYLINDER BLOCK
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CYLINDER BLOCK
Exploded View
INFOID:0000000003304161
1.
Reinforcement plate
2.
Drive plate
3.
Rear oil seal retainer
4.
Sub harness
5.
Knock sensor
6.
Cylinder block
7.
Thrust bearing (upper)
8.
Main bearing (upper)
9.
Crankshaft
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Disassembly and Assembly
INFOID:0000000003304231
DISASSEMBLY
1.
Remove the following parts:
• Intake manifold collector: Refer to
.
• Intake manifold: Refer to
• Oil pans (lower and upper): Refer to
.
• Front and rear timing chain case: Refer to
• Cylinder head: Refer to
2.
Remove knock sensor.
CAUTION:
Carefully handle sensor avoiding shocks.
3.
Remove rear oil seal retainer.
• Remove by inserting screwdriver between main bearing cap and rear oil seal retainer.
CAUTION:
If rear oil seal retainer is removed, replace it with new one.
NOTE:
Regard both rear oil seal and retainer as an assembly.
4.
Remove baffle plate from main bearing beam.
5.
Remove piston and connecting rod assembly with the following procedure:
• Before removing piston and connecting rod assembly, check the connecting rod side clearance. Refer to
.
CAUTION:
Be careful not to drop connecting rod bearing, and to scratch the surface.
a.
Position crankshaft pin corresponding to connecting rod to be removed onto the bottom dead center.
b.
Remove connecting rod bearing cap.
c.
Using a hammer handle or similar tool, push piston and connect-
ing rod assembly out to the cylinder head side.
CAUTION:
Be careful not to damage the cylinder wall and crankshaft
pin, resulting from an interference of the connecting rod big
end.
6.
Remove connecting rod bearings from connecting rod and connecting rod bearing cap.
CAUTION:
• Be careful not to drop connecting rod bearing, and to scratch the surface.
• Identify installation positions, and store them without mixing them up.
7.
Remove piston rings form piston.
• Before removing piston rings, check the piston ring side clearance. Refer to
.
10. Crankshaft key
11. Thrust bearing (lower)
12. Main bearing (lower)
13. Main bearing cap
14. Main bearing cap bolt
15. Main bearing beam
16. Baffle plate
17. Connecting rod bolt
18. Connecting rod bearing cap
19. Connecting rod bearing
20. Connecting rod
21. Snap ring
22. Piston pin
23. Piston
24. Oil ring
25. Second ring
26. Top ring
27. Pilot converter
28. Oil jet
29. Gasket (for Canada)
30. Cylinder block heater (for Canada)
A.
Crankshaft side
B.
Chamfered
C.
D.
Front mark
for symbols in the figure.
EMQ0191D
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• Use a piston ring expander (commercial service tool) (A).
CAUTION:
• When removing piston rings, be careful not to damage
piston.
• Be careful not to damage piston rings by expanding them
excessively.
8.
Remove piston from connecting rod as follows:
a.
Using a snap ring pliers (A), remove snap rings.
b.
Heat piston to 60 to 70
°
C (140 to 158
°
F) with an industrial use
drier (A) or equivalent.
c.
Push out piston pin with stick of outer diameter approximately 20
mm (0.79 in).
9.
Remove main bearing cap bolts.
NOTE:
• Before loosening main bearing cap bolts, measure the crankshaft end play. Refer to
JPBIA0194ZZ
JPBIA0195ZZ
JPBIA0196ZZ
PBIC0262E
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EM-120
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CYLINDER BLOCK
• Loosen main bearing cap bolts in the reverse order shown in
the figure in several different steps.
10. Remove main bearing beam.
11. Remove main bearing caps.
CAUTION:
Be careful not to drop main bearing, and to scratch the sur-
face.
• Using main bearing cap bolts, remove main bearing cap while
shaking it back-and-forth.
12. Remove crankshaft.
13. Remove main bearings and thrust bearings from cylinder block and main bearing caps.
CAUTION:
• Be careful not to drop main bearing, and to scratch the surface.
• Identify installation positions, and store them without mixing them up.
14. Remove oil jet.
ASSEMBLY
1.
Fully air-blow engine coolant and engine oil passages in cylinder block, cylinder bore and crankcase to
remove any foreign material.
CAUTION:
Use a goggles to protect your eye.
: Engine front
JPBIA0439ZZ
PBIC0881E
EMQ0195D
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CYLINDER BLOCK
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2.
Install each plug to cylinder block as shown in the figure.
• Apply sealant to the thread of water drain plug (A).
Use Anaerobic Liquid Gasket or equivalent. Refer to
17, "Recommended Chemical Products and Sealants"
.
NOTE:
For Canada, water drain plug (A) in the figure is not water
drain plug but block heater. Refer to
• Apply sealant to the thread of connector bolt (D).
Use Genuine RTV Silicone Sealant or equivalent. Refer to
GI-17, "Recommended Chemical Products and Sealants"
.
• Apply sealant to the thread of plug (C).
Use genuine high strength thread locking sealant or
equivalent. Refer to
• Replace washers with new one.
• Tighten each plug and connector bolt as specified below.
3.
Install oil jet.
• Insert oil jet dowel pin (A) into cylinder block dowel pin hole,
and tighten mounting bolts.
4.
Install main bearings and thrust bearings as follows:
CAUTION:
Be careful not to drop main bearing, and to scratch the surface.
a.
Remove dust, dirt, and engine oil on bearing mating surfaces of cylinder block and main bearing caps.
B
: Water drain plug
PBIC2487E
Part
Washer
Tightening torque
A
Yes
62.0 N·m (6.3 kg-m, 46 ft-lb)
B
No
9.8 N·m (1.0 kg-m, 87 in-lb)
C
Yes
62.0 N·m (6.3 kg-m, 46 ft-lb)
D
No
39.2 N·m (4.0 kg-m, 29 ft-lb)
: Engine front
JPBIA0198ZZ
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CYLINDER BLOCK
b.
Install thrust bearings (1) to the both sides of the No. 3 journal
housing on cylinder block and main bearing cap.
• Install thrust bearings with the oil groove (E) facing crankshaft
arm (outside).
• Install thrust bearing with a projection on one end on cylinder block, and thrust bearing with a projection
at center on main bearing cap. Align each projection with mating notch.
c.
Install main bearings paying attention to the direction.
• Main bearing with oil hole (B) and groove (C) goes on cylinder
block. The one without them goes on main bearing cap.
• Before installing main bearings, apply engine oil to the bearing
surface (inside). Do not apply engine oil to the back surface,
but thoroughly clean it.
• When installing, align main bearing stopper protrusion to cut-
out of cylinder block and main bearing caps.
• Ensure the oil holes on cylinder block and those on the corresponding bearing are aligned.
5.
Install crankshaft to cylinder block.
• While turning crankshaft by hand, check that it turns smoothly.
6.
Install main bearing caps.
• Main bearing caps are identified by identification mark cast on
them. For installation, face front mark (E) to front side.
NOTE:
Main bearing cap cannot be replaced as a single part, because it
is machined together with cylinder block.
7.
Install main bearing beam.
• Install main bearing beam with front mark facing downward (oil pan side).
• Install main bearing beam with front mark facing front of the
engine.
A
: No. 1
B
: No. 2
C
: No. 3
D
: No. 4
F
: Thrust bearing installation position
: Engine front
JPBIA0199ZZ
A
: Cylinder block side
D
: Main bearing cap side
: Engine front
JPBIA0200ZZ
A
: No. 1
B
: No. 2
C
: No. 3
D
: No. 4
: Engine front
JPBIA0440ZZ
PBIC0881E
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8.
Install main bearing cap bolts in numerical order as shown in the
figure as follows:
a.
Inspect the outer diameter of main bearing cap bolt. Refer to
.
b.
Apply new engine oil to threads and seat surfaces of main bear-
ing cap bolts.
c.
Tighten main bearing cap bolts in several different steps.
d.
Turn all main bearing cap bolts 90 degrees clockwise (angle tightening).
CAUTION:
Use the angle wrench [SST: KV10112100 (BT8653-A)] to
check tightening angle. Never make judgment by visual
inspection.
• After installing main bearing cap bolts, check that crankshaft
can be rotated smoothly by hand.
• Check the crankshaft end play. Refer to
9.
Install piston to connecting rod as follows:
a.
Using snap ring pliers, install new snap ring to the groove of piston rear side.
• Insert it fully into groove to install.
b.
Install piston to connecting rod.
• Using an industrial drier or similar tool, heat piston until piston pin can be pushed in by hand without
excess force [approximately 60 to 70
°
C (140 to 158
°
F)]. From the front to the rear, insert piston pin into
piston and connecting rod.
• Assemble so that the front mark on the piston crown and the
cylinder number on connecting rod are positioned as shown in
the figure.
c.
Install new snap ring to the groove of the piston front side.
• Insert it fully into groove to install.
• After installing, check that connecting rod moves smoothly.
10. Using a piston ring expander (commercial service tool) (A),
install piston rings.
CAUTION:
• When installing piston rings, be careful not to damage
piston.
• Be careful not to damage piston rings by expending them
excessively.
: Engine front
: 35.3 N·m (3.6 kg-m, 26 ft-lb)
JPBIA0439ZZ
PBIC0921E
SEM838F
JPBIA0194ZZ
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EM-124
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• If there is stamped mark on ring, mount it with marked side up.
NOTE:
If there is no stamp on ring, no specific orientation is required
for installation.
• Position each ring with the gap as shown in the figure referring
to the piston front mark (D).
• Check the piston rings side clearance. Refer to
.
11. Install connecting rod bearings to connecting rod and connecting rod bearing cap.
CAUTION:
Be careful not to drop connecting rod bearing, and to scratch the surface.
• Before installing connecting rod bearings, apply engine oil to the bearing surface (inside). Do not apply
engine oil to the back surface, but thoroughly clean it.
• When installing, align connecting rod bearing stopper protru-
sion (B) with cutout (C) of connecting rod and connecting rod
bearing cap to install.
• Ensure the oil hole (A) on connecting rod and that on the cor-
responding bearing are aligned.
12. Install piston and connecting rod assembly to crankshaft.
• Position crankshaft pin corresponding to connecting rod to be installed onto the bottom dead center.
• Apply engine oil sufficiently to the cylinder bore, piston and crankshaft pin journal.
• Match the cylinder position with the cylinder number on connecting rod to install.
• Be sure that front mark on piston crown is facing front of engine.
• Using a piston ring compressor [SST: EM03470000 (J-8037)]
(A) or suitable tool, install piston with the front mark on the pis-
ton crown facing the front of the engine.
CAUTION:
Be careful not to damage the cylinder wall and crankshaft
pin, resulting from an interference of the connecting rod big
end.
Stamped mark:
Top ring (A)
: —
Second ring (B)
: 2 R
JPBIA0263ZZ
C
: Top ring gap
E
: Oil ring upper or lower rail gap (either of then)
F
: Second ring and oil ring spacer gap
a
: 90 degrees
b
: 45 degrees
JPBIA0205ZZ
JPBIA0206ZZ
JPBIA0207ZZ
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13. Install connecting rod bearing cap.
• Match the stamped cylinder number marks on connecting rod
with those on connecting rod bearing cap to install.
• Be sure that front mark (H) on connecting rod bearing cap is facing front of the engine.
14. Tighten connecting rod bolt as follows:
a.
Inspect the outer diameter of connecting rod bolt. Refer to
.
b.
Apply engine oil to the threads and seats of connecting rod bolts.
c.
Tighten connecting rod bolts.
d.
Then tighten all connecting rod bolts 90 degrees clockwise (angle tightening).
CAUTION:
Always use the angle wrench [SST: KV10112100 (BT8653-
A)]. Avoid tightening based on visual check alone.
• After tightening connecting rod bolts, check that crankshaft
rotates smoothly.
• Check the connecting rod side clearance. Refer to
.
15. Install baffle plate to main bearing beam.
16. Install new rear oil seal retainer to cylinder block. Refer to
EM-104, "REAR OIL SEAL : Removal and
.
17. Install pilot converter.
• With drift [outer diameter: approximately 33 mm (1.30 in)],
press-fit as far as it will go.
A
: Sample codes
B
: Bearing stopper groove
C
: Small-end diameter grade
D
: Standard stamp
E
: Weight grade
F
: Cylinder No.
G
: Management code
I
: Management code
JPBIA0208ZZ
: 19.6 N·m (2.0 kg-m, 14 ft-lb)
SEM953E
PBIC0899E
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EM-126
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CYLINDER BLOCK
• Press-fit pilot converter with its chamfer facing crankshaft as
shown in the figure.
18. Install knock sensors.
• Install knock sensor so that connector faces the rear of the
engine.
• After installing knock sensor, connect harness connector, and
lay it out to rear of engine.
CAUTION:
• Never tighten mounting bolts while holding connector.
• If any impact by dropping is applied to knock sensor,
replace it with new one.
NOTE:
• Check that there is no foreign material on the cylinder block
mating surface and the back surface of knock sensor.
• Check that knock sensor does not interfere with other parts.
19. Note the following, assemble in the reverse order of disassembly after this step.
Drive plate
• When installing drive plate to crankshaft, be sure to correctly align crankshaft side dowel pin and drive
plate side dowel pin hole.
- If these are not aligned correctly, engine runs roughly and “MIL” turns on.
• Install drive plate (2) and reinforcement plate (3) as shown in
the figure.
• Holding ring gear with the pulley holder (commercial service
tool).
• Tighten mounting bolts crosswise over several times.
Inspection
INFOID:0000000003304163
CRANKSHAFT END PLAY
: Crankshaft side
JPBIA0210ZZ
A
: Bank 1
B
: Bank 2
: Engine front
JPBIA0211ZZ
1
: Ring gear
4
: Pilot converter
5
: Crankshaft
A
: Rounded
: Engine front
JPBIA0212ZZ
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• Measure the clearance between thrust bearings and crankshaft
arm when crankshaft is moved fully forward or backward with a dial
indicator.
• If the measured value exceeds the limit, replace thrust bearings,
and measure again. If it still exceeds the limit, replace crankshaft
also.
CONNECTING ROD SIDE CLEARANCE
• Measure the side clearance between connecting rod and crank-
shaft arm with a feeler gauge (A).
• If the measured value exceeds the limit, replace connecting rod,
and measure again. If it still exceeds the limit, replace crankshaft
also.
PISTON TO PISTON PIN OIL CLEARANCE
Piston Pin Hole Diameter
Measure the inner diameter of piston pin hole with an inside
micrometer (A).
Piston Pin Outer Diameter
Measure the outer diameter of piston pin with a micrometer (A).
Piston to Piston Pin Oil Clearance
(Piston to piston pin oil clearance) = (Piston pin hole diameter) – (Piston pin outer diameter)
• If the calculated value is out of the standard, replace piston and piston pin assembly.
• When replacing piston and piston pin assembly, refer to
.
NOTE:
• Piston is available together with piston pin as assembly.
Standard and limit
: Refer to
.
EMQ0196D
Standard and limit
: Refer to
JPBIA0536ZZ
Standard
: Refer to
JPBIA0217ZZ
Standard
: Refer to
JPBIA0218ZZ
Standard
: Refer to
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EM-128
< DISASSEMBLY AND ASSEMBLY >
CYLINDER BLOCK
• Piston pin (piston pin hole) grade is provided only for the parts installed at the plant. For service parts, no
piston pin grades can be selected. (Only “0” grade is available.)
PISTON RING SIDE CLEARANCE
• Measure the side clearance of piston ring (1) and piston ring
groove with a feeler gauge (C).
• If the measured value exceeds the limit, replace piston ring, and
measure again. If it still exceeds the limit, replace piston also.
PISTON RING END GAP
• Check that the cylinder bore inner diameter is within the specification. Refer to
• Lubricate with new engine oil to piston (1) and piston ring (2), and
then insert piston ring until middle of cylinder with piston, and mea-
sure the piston ring end gap with a feeler gauge (B).
• If the measured value exceeds the limit, replace piston ring, and
measure again. If it still exceeds the limit, rebore cylinder and use
oversize piston and piston rings.
CONNECTING ROD BEND AND TORSION
• Check with a connecting rod aligner.
• If it exceeds the limit, replace connecting rod assembly.
CONNECTING ROD BIG END DIAMETER
• Install connecting rod bearing cap without installing connecting rod bearing, and tightening connecting rod
bolts to the specified torque. Refer to
EM-118, "Disassembly and Assembly"
for the tightening procedure.
A
: NG
B
: OK
Standard and limit
: Refer to
.
JPBIA0219ZZ
A
: Press-fit
C
: Measuring point
Standard and limit
: Refer to
JPBIA0220ZZ
A
: Bend
B
: Torsion
C
: Feeler gauge
Bend limit
: Refer to
Torsion limit
JPBIA0221ZZ
Revision: 2008 October
2009 Murano
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