Nissan Qashqai J11. Manual — part 49

CAMSHAFT VALVE CLEARANCE

EM-135

< BASIC INSPECTION >

[MR20DD]

C

D

E

F

G

H

I

J

K

L

M

A

EM

N

P

O

3.

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

4.

Use the equation below to calculate valve lifter thickness for replacement.

• Thickness of new valve lifter

can be identified by stamp

mark

on the reverse side (inside the cylinder).

• Stamp mark “302H” indicates 3.02 mm (0.1189 in) in thick-

ness.

NOTE:
Available thickness of valve lifter: 26 sizes range 3.00 to 3.50 mm (0.1181 to 0.1378 in) in steps of 0.02
mm (0.0008 in) (when manufactured at factory). Refer to

EM-249, "Camshaft"

.

5.

Install the selected valve lifter.

6.

Install camshaft. Refer to

EM-196, "Exploded View"

.

7.

Install timing chain and related parts. Refer to

EM-183, "Exploded View"

.

8.

Manually rotate crankshaft pulley a few rotations.

9.

Check that the valve clearances is within the standard. Refer to “INSPECTION”.

10. Install remaining parts in the reverse order of removal.

11. Warm up the engine, and check for unusual noise and vibration.

JPBIA0169ZZ

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

: 0.28 mm (0.011 in)

Exhaust

: 0.30 mm (0.012 in)

PBIC3196J

EM-136

< BASIC INSPECTION >

[MR20DD]

COMPRESSION PRESSURE

COMPRESSION PRESSURE

Inspection

INFOID:0000000010715453

1.

Warm up engine thoroughly. Then, stop it.

2.

Release the fuel pressure. Refer to

ECM-135, "Work Procedure"

.

3.

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

EM-170, "Exploded View"

.

4.

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

5.

Install compression gauge (A) with an adapter (B) (commercial
service tool) onto spark plug hole.

• Use the adapter 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.

6.

With accelerator pedal fully depressed, turn ignition switch to “START” for cranking. When the gauge
pointer stabilizes, read the compression pressure and the engine rpm. Perform these steps to check each
cylinder.

CAUTION:

Always use a fully charged battery to obtain the specified engine speed.
• If the engine speed is out of the specified range, check battery liquid for proper gravity. Check the

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 cylinder has low compression pressure, pour small amount of engine oil into the spark plug hole

of the cylinder to recheck it for compression.

- If the added engine oil improves the compression, piston rings may be worn out or damaged. Check pis-

ton rings and replace if necessary.

- If the compression pressure remains at low level despite the addition of engine oil, valves may be mal-

functioning. Check valves for damage. Replace valve or valve seat accordingly.

• If two adjacent cylinders have respectively low compression pressure and their compression remains

low even after the addition of engine oil, cylinder head gaskets are leaking. In such a case, replace cyl-
inder head gaskets.

7.

After inspection is completed, install removed parts.

8.

Start the engine, and check that the engine runs smoothly.

9.

Perform trouble diagnosis. If DTC appears, erase it. Refer to

ECM-65, "CONSULT Function"

.

JPBIA6826ZZ

: 20 mm (0.79 in)

JPBIA0171ZZ

Compression pressure

: Refer to

EM-248, "General Specification"

.

NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING

EM-137

< SYMPTOM DIAGNOSIS >

[MR20DD]

C

D

E

F

G

H

I

J

K

L

M

A

EM

N

P

O

SYMPTOM DIAGNOSIS

NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING

NVH troubleshooting Chart

INFOID:0000000010715454

1.

Locate the area where noise occurs.

2.

Confirm the type of noise.

3.

Specify the operating condition of engine.

4.

Check specified noise source.

If necessary, repair or replace these parts.

JPBIA6913GB

EM-138

< SYMPTOM DIAGNOSIS >

[MR20DD]

NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING

A: Closely related

B: Related

C: Sometimes related

—: Not related

Location

of noise

Type of

noise

Operating condition of engine

Source of

noise

Check item

Refer-

ence page

Before

warm-

up

After

warm-

up

When

start-

ing

When

idling

When

racing

While

driving

Top of en-
gine
Rocker
cover
Cylinder
head

Ticking or
clicking

C

A

—

A

B

—

Tappet
noise

Valve clearance

EM-133

Rattle

C

A

—

A

B

C

Camshaft
bearing
noise

Camshaft journal oil
clearance
Camshaft runout

EM-249

Crank-
shaft pul-
ley
Cylinder
block
(Side of
engine)
Oil pan

Slap or
knock

—

A

—

B

B

—

Piston pin
noise

Piston to piston pin oil
clearance
Connecting rod bushing
oil clearance

EM-253

Slap or
rap

A

—

—

B

B

A

Piston
slap noise

Piston to cylinder bore
clearance
Piston ring side clear-
ance
Piston ring end gap
Connecting rod bend
and torsion

EM-253

Knock

A

B

C

B

B

B

Connect-
ing rod
bearing
noise

Connecting rod bushing
oil clearance
Connecting rod bearing
oil clearance

EM-253
EM-256

Knock

A

B

—

A

B

C

Main bear-
ing noise

Main bearing oil clear-
ance
Crankshaft runout

EM-257
EM-253

Front of
engine
Front cov-
er

Tapping or
ticking

A

A

—

B

B

B

Timing
chain and
chain ten-
sioner
noise

Timing chain cracks
and wear
Timing chain tensioner
operation

EM-194
EM-183

Front of
engine

Squeak-
ing or fizz-
ing

A

B

—

B

—

C

Drive belt
(Sticking
or slip-
ping)

Drive belt deflection

EM-139

Creaking

A

B

A

B

A

B

Drive belt
(Slipping)

Idler pulley bearing op-
eration

Squall
Creak

A

B

—

B

A

B

Water
pump
noise

Water pump operation

CO-49