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Nissan Qashqai (2007-2010). Manual - part 48

EM-140

< ON-VEHICLE MAINTENANCE >

[MR20DE]

CAMSHAFT VALVE CLEARANCE

Set No.4 cylinder at TDC of its compression stroke.
• Rotate crankshaft pulley (1) one revolution (360 degrees) and

align TDC mark (no paint) (B) to timing indicator (A) on front
cover.

• By referring to the figure, measure the valve clearance at loca-

tions marked “

” as shown in the table below [locations indi-

cated with black arrow (

) in the figure] with a feeler gauge.

If out of standard, perform adjustment. Refer to “ADJUSTMENT”.

ADJUSTMENT

• Perform adjustment depending on selected head thickness of valve lifter.

Remove camshaft. Refer to

EM-173, "Exploded View"

Remove valve lifters at the locations that are out of the standard.

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

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

: Intake side

: Engine front

Measuring position

No. 1 CYL.

No. 2 CYL.

No. 3 CYL.

No. 4 CYL.

No. 1 cylinder at compression TDC

EXH

INT

C : White paint mark (Not use for service)

PBIC3960E

: Exhaust side

: No.1 cylinder

: No.2 cylinder

: No.3 cylinder

: No.4 cylinder

: Intake side

: Engine front

Measuring position

No. 1 CYL.

No. 2 CYL.

No. 3 CYL.

No. 4 CYL.

No. 4 cylinder at compression TDC

EXH

INT

PBIC3194J

PBIC3195J

CAMSHAFT VALVE CLEARANCE

EM-141

< ON-VEHICLE MAINTENANCE >

[MR20DE]

• Thickness of new valve lifter (B) can be identified by stamp

mark (A) on the reverse side (inside the cylinder).

• Stamp mark “302” indicates 3.02 mm (0.118 in) in thickness.

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-237, "Camshaft"

Install the selected valve lifter.

Install camshaft. Refer to

EM-173, "Exploded View"

Install timing chain and related parts. Refer to

EM-162, "Exploded View"

Manually rotate crankshaft pulley a few rotations.

Make sure 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.

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)

PBIC3196J

EM-142

< ON-VEHICLE MAINTENANCE >

[MR20DE]

COMPRESSION PRESSURE

COMPRESSION PRESSURE

Inspection

INFOID:0000000000893927

Warm up engine thoroughly. Then, stop it.

Release fuel pressure. Refer to

EC-357, "Inspection"

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

EM-160, "Exploded View"

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

Install compression gauge (B) with an adapter (A) (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.

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 changed 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 re-check 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.

After inspection is completed, install removed parts.

Start the engine, and make sure that the engine runs smoothly.

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

EC-109, "Description"

PBIC3541J

SBIA0533E

Compression pressure

: Refer to

EM-236, "General Specification"

DRIVE BELT AUTO-TENSIONER

EM-143

< ON-VEHICLE REPAIR >

[MR20DE]

ON-VEHICLE REPAIR

DRIVE BELT AUTO-TENSIONER

Exploded View

INFOID:0000000000902357

Removal and Installation

INFOID:0000000000902358

Removal

Remove drive belt. Refer to

EM-134, "Exploded View"

• Keep drive belt auto-tensioner pulley arm locked after drive belt is removed.

Remove front fender protector (RH). Refer to

STR-31, "Starter Motor"

Support the bottom surface of engine using a transmission jack, and then remove the engine mounting
stay and the engine mounting insulator (RH). Refer to

EM-194, "M/T : Exploded View"

(M/T models) or

EM-198, "CVT : Exploded View"

(CVT models).

Loosen mounting bolt and remove drive belt auto-tensioner.
• Lift the front side of the engine with a jack sustaining engine base to remove mounting bolt.
NOTE:
Use TORX socket (size T50).

Installation

Installation is the reverse order of removal.

CAUTION:

When installing drive belt auto-tensioner, be careful not to interfere with water pump pulley.

Front cover

Drive belt auto-tensioner

PBIC3937E

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