Qashqai J11. Engine mechanical (HRA2DDT, K9K, MR20DD) — part 14
CYLINDER HEAD
EM-209
< UNIT DISASSEMBLY AND ASSEMBLY >
[MR20DD]
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Removal and Installation
INFOID:0000000010715509
REMOVAL
1.
Release fuel pressure. Refer to
2.
Drain engine coolant and engine oil. Refer to
3.
Remove the following components and related parts.
• Intake manifold: Refer to
.
• Exhaust manifold: Refer to
• High pressure fuel pump: Refer to
.
• Fuel tube and fuel injector assembly: Refer to
.
• Water outlet: Refer to
.
• Rocker cover: Refer to
• Front cover, timing chain: Refer to
.
Valve collet
Valve spring retainer
Valve spring
(with valve spring seat) (EXH)
Valve oil seal
Valve guide (EXH)
Valve seat (EXH)
Valve (EXH)
Valve (INT)
Valve seat (INT)
Cylinder head
Valve guide (INT)
Spark plug
Valve spring
(with valve spring seat) (INT)
Comply with the installation procedure
when tightening. Refer to
: Always replace after every disassembly.
: N·m (kg-m, ft-lb)
: Should be lubricated with oil.
JPBIA1753GB
EM-210
< UNIT DISASSEMBLY AND ASSEMBLY >
[MR20DD]
CYLINDER HEAD
• Camshaft: Refer to
.
4.
Remove cylinder head.
• Loosen cylinder head bolts in the order from 10 to 1 as shown
in the figure.
• Using TORX socket (size: E18), loosen cylinder head bolts.
5.
Remove cylinder head gasket.
INSTALLATION
1.
Install cylinder head gasket.
2.
Install cylinder head, and tighten cylinder head bolts in the order
from 1 to 10 as shown in the figure with the following procedure.
CAUTION:
If cylinder head bolts are reused, check their outer diame-
ters before installation. Refer to
.
a.
Apply new engine oil to threads and seating surface of mounting
bolts.
b.
Tighten all cylinder head bolts.
c.
Turn all cylinder head bolts 100 degrees clockwise (angle tightening).
CAUTION:
Check and confirm the tightening angle by using an angle
wrench [SST: KV10112100]
or protractor. Never judge by
visual inspection without the tool.
d.
Completely loosen.
CAUTION:
In this step, loosen cylinder head bolts in reverse order that
indicated in the figure.
e.
Tighten all cylinder head bolts.
f.
Turn all cylinder head bolts 95 degrees clockwise (angle tightening).
g.
Turn all cylinder head bolts 95 degrees clockwise again (angle tightening).
3.
Install in the reverse order of removal, for the rest of parts.
Disassembly and Assembly
INFOID:0000000010715510
DISASSEMBLY
1.
Remove spark plug with spark plug wrench (commercial service tool).
2.
Remove valve lifter.
• Identify installation positions, and store them without mixing them up.
: Engine front
PBIC3206J
: Engine front
: 40.0 N·m (4.1 kg-m, 30 ft-lb)
: 0 N·m (0 kg-m, 0 ft-lb)
: 40.0 N·m (4.1 kg-m, 30 ft-lb)
PBIC3206J
PBIC3208J
CYLINDER HEAD
EM-211
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[MR20DD]
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3.
Remove valve collet.
• Compress valve spring with the valve spring compressor [SST:
KV10116200] (A), the attachment [SST: KV10115900] (C), and
the adapter [SST: KV10109220] (B). Remove valve collet with
a magnet hand.
CAUTION:
• Be careful not to damage valve lifter holes.
• Fit the attachment [SST: KV10115900 (J-26336-20)]
in
thecenter of valve spring retainer
to press it.
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.
• Identify installation positions, and store them without mixing them up.
6.
Remove valve oil seal with a valve oil seal puller [SST:
KV10107902] .
7.
When valve seat must be replaced.
• 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
.
CAUTION:
Never bore excessively to prevent cylinder head from scratching.
8.
When valve guide must be replaced.
JPBIA0180ZZ
JPBIA4477ZZ
PBIC3210J
EM-212
< UNIT DISASSEMBLY AND ASSEMBLY >
[MR20DD]
CYLINDER HEAD
a.
To remove valve guide, heat cylinder head to 110 to 130
°
C (230
to 266
°
F) by soaking in heated oil
.
b.
Drive out valve guide with a hammer and valve guide drift (com-
mercial service tool) (A).
CAUTION:
Cylinder head contains heat, wear protective equipment to
avoid getting burned.
ASSEMBLY
1.
When valve guide is removed, install it.
CAUTION:
Replace with oversize [0.2 mm (0.008 in)] valve guide.
a.
Ream cylinder head valve guide hole with a valve guide reamer
(commercial service tool) (A).
b.
Heat cylinder head to 110 to 130
°
C (230 to 266
°
F) by soaking in
heated oil
.
PBIC3214J
JSBIA2470ZZ
For service parts: Oversize [0.2 mm (0.008 in)]
.
JPBIA0185ZZ
PBIC3214J
CYLINDER HEAD
EM-213
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[MR20DD]
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c.
Press valve guide
from camshaft side to dimensions as
shown in the figure.
CAUTION:
Cylinder head contains heat, wear protective equipment to
avoid getting burned.
d.
Apply reamer finish to valve guide with a valve guide reamer
(commercial service tool) (A).
2.
When valve seat is removed, install it.
CAUTION:
Replace with oversize [0.5 mm (0.020 in)] valve seat.
a.
Ream cylinder head
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.
b.
Heat cylinder head to 110 to 130
°
C (230 to 266
°
F) by soaking in
heated oil
.
c.
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, wear protective equipment to avoid getting burned.
: Cylinder head
Projection (H)
: Refer to
.
PBIC3217J
Standard
: Refer to
.
JPBIA0185ZZ
For service parts: Oversize [0.5 mm (0.020 in)]
PBIC3218J
PBIC3214J
EM-214
< UNIT DISASSEMBLY AND ASSEMBLY >
[MR20DD]
CYLINDER HEAD
d.
Using valve seat cutter set (commercial service tool) (A) or valve
seat grinder, finish valve seat to the specified dimensions. For
dimensions, refer to
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.
e.
Using compound, grind to adjust valve fitting.
f.
Check again for normal contact. Refer to
.
3.
Install valve oil seal.
• Install with a valve oil seal drift [SST: KV10115600]
to match
dimension in the figure.
NOTE:
Dimension is height that measured before installing valve
spring (with valve spring seat).
4.
Install valve.
• Install larger diameter to intake side.
5.
Install valve spring (with valve spring seat).
• Install smaller pitch (valve spring seat side) to cylinder head
side .
• Confirm identification color
of valve spring.
6.
Install valve spring retainer.
7.
Install valve collet.
• Compress valve spring with the valve spring compressor [SST:
KV10116200] (A), the attachment [SST: KV10115900] (C), and
the adapter [SST: KV10109220] (B). Install valve collet with a
magnet hand.
CAUTION:
• Be careful not to damage valve lifter holes.
JSBIA2471ZZ
Height (H)
: 15.1 - 15.7 mm (0.594 - 0.618 in)
PBIC3211J
: Valve spring seat (Do not remove from valve spring.)
Intake
: White
Exhaust
: Orange
JPBIA4479ZZ
JPBIA0180ZZ
CYLINDER HEAD
EM-215
< UNIT DISASSEMBLY AND ASSEMBLY >
[MR20DD]
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• Fit the attachment [SST: KV10115900 (J-26336-20)]
in
thecenter of valve spring retainer
to press it.
• 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 with spark plug wrench (commercial service tool).
Inspection
INFOID:0000000010715511
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
.
1.
Wipe off engine oil and remove water scale (like deposit), gasket, sealant, carbon, etc. with a scraper.
CAUTION:
Never 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.
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
CONTACT".
VALVE GUIDE CLEARANCE
JPBIA4477ZZ
Limit [(d1) – (d2)]: 0.15 mm (0.0059 in)
PBIC3994E
Limit: Refer to
JSBIA2474ZZ
EM-216
< UNIT DISASSEMBLY AND ASSEMBLY >
[MR20DD]
CYLINDER HEAD
Valve Stem Diameter
• Measure the diameter of valve stem with micrometer (B).
Valve Guide Inner Diameter
• Measure the inner diameter of valve guide with bore gauge (A).
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
EM-210, "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 circum-
ference.
• If not, grind to adjust valve fitting and check again. If the contacting
surface still has “NG” conditions
even after the recheck, replace
valve seat. Refer to
EM-210, "Disassembly and Assembly"
.
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
• Check valve spring pressure with valve spring seat installed at the
specified spring height.
CAUTION:
Never remove valve spring seat from valve spring.
• If the installation load or load with valve open is out of the stan-
dard, replace valve spring (with valve spring seat).
Standard and Limit: Refer to
JSBIA2475ZZ
: OK
JPBIA0187ZZ
: Contact
C
: V-block
Limit
: Refer to
JSBIA4163ZZ
Standard
: Refer to
SEM113
CYLINDER HEAD
EM-217
< UNIT DISASSEMBLY AND ASSEMBLY >
[MR20DD]
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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-59, "Fluids and Lubricants"
.
• 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:
*: Power steering fluid, brake fluid, etc.
Items
Before starting engine
Engine running
After engine stopped
Engine coolant
Level
Leakage
Level
Engine oil
Level
Leakage
Level
Transmission /
transaxle fluid
AT & CVT Models
Leakage
Level / Leakage
Leakage
MT Models
Level / Leakage
Leakage
Level / Leakage
Other oils and fluids*
Level
Leakage
Level
Fuel
Leakage
Leakage
Leakage
Exhaust gases
—
Leakage
—
E M - 2 1 8
< UNIT DISASSEMBLY AND ASSEMBLY >
[MR20DD]
OIL PAN (UPPER)
OIL PAN (UPPER)
Exploded View
INFOID:0000000010715512
Removal and Installation
INFOID:0000000010715513
REMOVAL
1.
Remove oil pan (lower). Refer to
2.
Remove oil filter. Refer to
LU-25, "Removal and Installation"
3.
Remove water hoses of oil cooler.
4.
Remove oil level gauge and oil level gauge guide.
5.
Remove front cover, timing chain, balancer unit timing chain, and other related parts. Refer to
Rear oil seal
O-ring
Oil pan (upper)
Drain plug
Drain plug washer
Oil pan (lower)
O-ring
Oil level gauge guide
Oil level gauge
To oil cooler
Oil pan (lower) side
: Oil pan side
: Always replace after every disassembly.
: N·m (kg-m, ft-lb)
: Should be lubricated with oil.
: Sealing point
JPBIA6893GB
OIL PAN (UPPER)
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6.
Remove oil pan (upper) with the following procedure:
a.
Loosen bolts in the order from 10 to 1 as shown in the figure.
b.
Insert a screwdriver shown by the arrow (
) in the figure and
open up a crack between oil pan (upper) and cylinder block.
CAUTION:
A more adhesive liquid gasket is applied compared to previ-
ous types when shipped, so it should not be forced off the
position not specified.
c.
Insert seal cutter [SST: KV10111100] between oil pan (upper) and cylinder block, and slide it by tapping on
the side of the tool with a hammer.
CAUTION:
Be careful not to damage the mating surface.
7.
Remove O-ring between cylinder block and oil pan (upper).
8.
Remove rear oil seal. Refer to
EM-206, "REAR OIL SEAL : Removal and Installation"
.
9.
Remove oil tempareture sensor, if necessary.
10. Remove oil cooler, if necessary.Refer to
INSTALLATION
CAUTION:
Do not reuse O-rings.
1.
Install oil pan (upper) with the following procedure:
a.
Use a scraper
to remove old liquid gasket from mating sur-
faces.
• Remove the old liquid gasket from mating surface of cylinder
block.
• Remove old liquid gasket from the bolt holes and threads.
CAUTION:
Never scratch or damage the mating surfaces when clean-
ing off old liquid gasket.
: Engine front
JPBIA5158ZZ
: Engine front
JPBIA5159ZZ
PBIC3949E
EM-220
< UNIT DISASSEMBLY AND ASSEMBLY >
[MR20DD]
OIL PAN (UPPER)
b.
Apply a continuous bead of liquid gasket
with a tube presser
(commercial service tool) as shown in the figure.
Use Genuine Liquid Gasket (Three Bond 1217H) or equiva-
lent.
CAUTION:
• Apply liquid gasket to outside of bolt hole for the posi-
tions shown by marks.
• Attaching should be done within 5 minutes after liquid
gasket application.
c.
Install new O-ring at cylinder block side.
CAUTION:
Install avoiding misalignment of O-ring.
d.
Tighten bolts in the order from 1 to 10 as shown in the figure.
2.
Install rear oil seal with the following procedure.
CAUTION:
• The installation of rear oil seal should be completed within 5 minutes after installing oil pan
(upper).
• Always replace rear oil seal with new one.
• Never touch oil seal lip.
a.
Wipe off liquid gasket protruding to the rear oil seal mounting part of oil pan (upper) and cylinder block
using a scraper.
b.
Apply engine oil to entire outside area of rear oil seal.
c.
Press-fit the rear oil seal using a suitable drift
with outer diam-
eter 115 mm (4.53 in) and inner diameter 90 mm (3.54 in).
: Oil pan (upper)
: 2 mm (0.08 in) protruded to outside
: 2 mm (0.08 in) protruded to rear oil seal mounting side
: 6.5 mm (0.26 in)
:
φ
4.0 - 5.0 (0.157 - 0.197 in)
: Engine front
: Engine outside
JPBIA5160ZZ
: Engine front
JPBIA5158ZZ
PBIC3951E
OIL PAN (UPPER)
EM-221
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[MR20DD]
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• Press-fit to the specified dimensions as shown in the figure.
CAUTION:
• Never touch the grease applied to the oil seal lip.
• Be careful not to damage the rear oil seal mounting part of
oil pan (upper) and cylinder block or the crankshaft.
• Press-fit straight, checking that rear oil seal does not curl
or tilt.
NOTE:
The standard surface of the dimension is the rear end surface of cylinder block.
3.
Install in the reverse order of removal, for the rest of parts.
Inspection
INFOID:0000000010715514
INSPECTION AFTER REMOVAL
Clean oil strainer portion (part of the oil pump) if any object attached.
: Rear oil seal
: Cylinder block rear end surface
: 0 - 0.5 mm (0 - 0.020 in)
JPBIA3011ZZ
EM-222
< UNIT DISASSEMBLY AND ASSEMBLY >
[MR20DD]
CYLINDER BLOCK
CYLINDER BLOCK
Exploded View
INFOID:0000000010715515
Cylinder block
O-ring
Crankshaft position sensor (POS)
Crankshaft position sensor (POS) cover
Oil filter (for intake valve timing control)
Knock sensor
JPBIA6819GB
CYLINDER BLOCK
EM-223
< UNIT DISASSEMBLY AND ASSEMBLY >
[MR20DD]
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Disassembly and Assembly
INFOID:0000000010715516
DISASSEMBLY
1.
Remove oil pan (upper). Refer to
.
2.
Remove thermostat housing. Refer to
3.
Remove knock sensor.
CAUTION:
Handle it carefully and avoid impacts.
4.
Remove crankshaft position sensor (POS) cover and crankshaft position sensor (POS).
CAUTION:
• Handle crankshaft position sensor (POS) carefully and avoid impacts.
• Never disassemble.
• Never place crankshaft position sensor (POS) in a location where it is exposed to magnetism.
5.
Remove oil filter (for intake valve timing control).
6.
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
.
a.
Position crankshaft pin corresponding to connecting rod to be removed onto the bottom dead center.
b.
Remove connecting rod 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 matching surface with connect-
ing rod cap.
• Be careful not to damage the cylinder wall and crankshaft
pin, resulting from an interference of the connecting rod
big end.
7.
Remove connecting rod bearings.
CAUTION:
When removing them, note the installation position. Keep them in the correct.
Oil pressure switch
Oil tempareture sensor
Oil jet
Top ring
Second ring
Oil ring
Snap ring
Piston
Piston pin
Connecting rod
Thrust bearing
Connecting rod bearing (upper)
Main bearing (upper)
Crankshaft key
Main bearing (lower)
Connecting rod bearing (lower)
Connecting rod cap
Connecting rod cap bolt
Main bearing cap
Main bearing cap bolt
Crankshaft
Signal plate
Rear oil seal
Comply with the installation procedure
when tightening. Refer to
: Always replace after every disassembly.
: N·m (kg-m, ft-lb)
: N·m (kg-m, in-lb)
: Sealing point
: Should be lubricated with oil.
: Select with proper thickness.
PBIC0259E
EM-224
< UNIT DISASSEMBLY AND ASSEMBLY >
[MR20DD]
CYLINDER BLOCK
8.
Remove piston rings form piston.
• Before removing piston rings, check the piston ring side clearance. Refer to
.
• Use a piston ring expander (commercial service tool) (A).
CAUTION:
• When removing piston rings, be careful not to damage
the piston.
• Be careful not to damage piston rings by expanding
them excessively.
9.
Remove piston from connecting rod with the following procedure:
a.
Using 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 (A) of outer diameter approxi-
mately 18 mm (0.71 in).
10. Remove main bearing cap bolts.
• Measure crankshaft end play before loosening main bearing cap bolts. Refer to
.
JSBIA2493ZZ
JSBIA2494ZZ
JSBIA2495ZZ
JSBIA2496ZZ
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