Nissan Qashqai J11. Manual — part 74

CYLINDER BLOCK

EM-235

< UNIT DISASSEMBLY AND ASSEMBLY >

[MR20DD]

C

D

E

F

G

H

I

J

K

L

M

A

EM

N

P

O

Cylinder Bore Inner Diameter

• Using a cylinder gauge, measure the cylinder bore for wear, out-of-

round and taper at six different points on each cylinder. [

and

directions at

,

, and

] [

is in longitudinal direction of engine]

NOTE:
When determining cylinder bore grade, measure the cylinder bore

direction at

position.

• If the measured value exceeds the limit, or if there are scratches and/or seizure on the cylinder inner wall,

replace cylinder block.
NOTE:
Oversize piston is not provided.

Piston Skirt Diameter

Measure the outer diameter of piston skirt with a micrometer (A).

Piston to Cylinder Bore Clearance

Calculate by piston skirt diameter and cylinder bore inner diameter
[direction ,

position ].

(Clearance) = (Cylinder bore inner diameter) – (Piston skirt diame-
ter)

: 10 mm (0.39 in)

: 60 mm (2.36 in)

: 130 mm (5.12 in)

Standard:

Cylinder bore inner diameter

: Refer to

EM-253, "Cylinder Block"

.

Limit:

Out-of-round [Difference between

and

]

Taper [Difference between

and

]

: Refer to

EM-253, "Cylinder Block"

.

JPBIA2059ZZ

Standard :

Refer

to

EM-253, "Cylinder Block"

.

JPBIA0227ZZ

: Direction A

: Position C

: Position E

: 10 mm (0.39 in)

: 60 mm (2.36 in)

: 130 mm (5.12 in)

Standard and Limit

: Refer to

EM-253, "Cylinder Block"

.

JPBIA2059ZZ

EM-236

< UNIT DISASSEMBLY AND ASSEMBLY >

[MR20DD]

CYLINDER BLOCK

• If it exceeds the limit, replace piston and piston pin assembly and/or cylinder block. Refer to

EM-240, "Pis-

ton"

.

CRANKSHAFT MAIN JOURNAL DIAMETER

• Measure the outer diameter of crankshaft main journals with a

micrometer (A).

• If out of the standard, measure the main bearing oil clearance.

Then use undersize bearing. Refer to

EM-243, "Main Bearing"

.

CRANKSHAFT PIN JOURNAL DIAMETER

• Measure the outer diameter of crankshaft pin journal with a micrometer.

• If out of the standard, measure the connecting rod bearing oil clearance. Then use undersize bearing. Refer

to

EM-241, "Connecting Rod Bearing"

.

OUT-OF-ROUND AND TAPER OF CRANKSHAFT

• Measure the dimensions at four different points as shown in the

figure on each main journal and pin journal with a micrometer.

• Out-of-round is indicated by the difference in dimensions between

and

at

and

.

• Taper is indicated by the difference in dimension between

and

at

and

.

• If the measured value exceeds the limit, correct or replace crankshaft.
• If corrected, measure the bearing oil clearance of the corrected main journal and/or pin journal. Then select

main bearing and/or connecting rod bearing. Refer to

EM-241, "Connecting Rod Bearing"

and/or

EM-243,

"Main Bearing"

.

CRANKSHAFT RUNOUT

• Place a V-block on a precise flat table to support the journals on the both end of the crankshaft.
• Place a dial indicator (A) straight up on the No. 3 journal.
• While rotating crankshaft, read the movement of the pointer on the

dial indicator. (Total indicator reading)

• If it exceeds the limit, replace crankshaft.

CONNECTING ROD BEARING OIL CLEARANCE

Method by Calculation

Standard :

Refer

to

EM-253, "Cylinder Block"

.

JPBIA6344ZZ

Standard :

Refer

to

EM-253, "Cylinder Block"

.

Limit:

Out-of-round [Difference between (X) and (Y)]

Taper [Difference between (A) and (B)]

: Refer to

EM-253, "Cylinder Block"

.

JPBIA0229ZZ

Standard and Limit

: Refer to

EM-253, "Cylinder

Block"

.

JPBIA6345ZZ

CYLINDER BLOCK

EM-237

< UNIT DISASSEMBLY AND ASSEMBLY >

[MR20DD]

C

D

E

F

G

H

I

J

K

L

M

A

EM

N

P

O

• Install connecting rod bearings

to connecting rod

and con-

necting rod bearing cap

, and tighten connecting rod cap bolts to

the specified torque. Refer to

EM-223, "Disassembly and Assem-

bly"

.

• Measure the inner diameter of connecting rod bearing with an

inside micrometer.
(Bearing oil clearance) = (Connecting rod bearing inner diameter)
– (Crankshaft pin journal diameter)

• If clearance exceeds the limit, select proper connecting rod bearing according to connecting rod big end

diameter and crankshaft pin journal diameter to obtain specified bearing oil clearance. Refer to

EM-241,

"Connecting Rod Bearing"

.

Method of Using Plastigage

• Remove engine oil and dust on crankshaft pin and the surfaces of each bearing completely.
• Cut a plastigage slightly shorter than the bearing width, and place it in crankshaft axial direction, avoiding oil

holes.

• Install connecting rod bearings to connecting rod and cap, and tighten connecting rod cap bolts to the speci-

fied torque. Refer to

EM-241, "Connecting Rod Bearing"

.

CAUTION:

Never rotate crankshaft.

• Remove connecting rod cap and bearing, and using the scale (A)

on the plastigage bag, measure the plastigage width.
NOTE:
The procedure when the measured value exceeds the limit is
same as that described in the “Method by Calculation”.

MAIN BEARING OIL CLEARANCE

Method by Calculation

• Install main bearings

to cylinder block

and main bearing cap

, and tighten main bearing cap mounting bolts to the specified

torque. Refer to

EM-223, "Disassembly and Assembly"

.

• Measure the inner diameter of main bearing with a cylinder gauge.
(Bearing oil clearance) = (Main bearing inner diameter) – (Crank-
shaft main journal diameter)

• If clearance exceeds the limit, select proper main bearing according to main bearing inner diameter and

crankshaft main journal diameter to obtain specified bearing oil clearance. Refer to

EM-243, "Main Bearing"

.

Method of Using Plastigage

• Remove engine oil and dust on crankshaft main journal and the surfaces of each bearing completely.
• Cut a plastigage slightly shorter than the bearing width, and place it in crankshaft axial direction, avoiding oil

holes.

: Example

: Inner diameter measuring direction

Standard and Limit

: Refer to

EM-256, "Connecting Rod Bearing"

.

PBIC3275J

JPBIA6346ZZ

: Example

: Inner diameter measuring direction

Standard and Limit

: Refer to

EM-257, "Main Bearing"

.

PBIC3277J

EM-238

< UNIT DISASSEMBLY AND ASSEMBLY >

[MR20DD]

CYLINDER BLOCK

• Install main bearings to cylinder block and main bearing cap, and tighten main bearing cap mounting bolts to

the specified torque. Refer to

EM-223, "Disassembly and Assembly"

.

CAUTION:

Never rotate crankshaft.

• Remove main bearing cap and bearings, and using the scale (A)

on the plastigage bag, measure the plastigage width.
NOTE:
The procedure when the measured value exceeds the limit is
same as that described in the “Method by Calculation”.

MAIN BEARING CRUSH HEIGHT

• When main bearing cap is removed after being tightened to the

specified torque with main bearings

installed, the tip end of

bearing must protrude

. Refer to

EM-223, "Disassembly and

Assembly"

.

• If the standard is not met, replace main bearings.

CONNECTING ROD BEARING CRUSH HEIGHT

• When connecting rod cap is removed after being tightened to the

specified torque with connecting rod bearings

installed, the tip

end of bearing must protrude

. Refer to

EM-223, "Disassembly

and Assembly"

.

• If the standard is not met, replace connecting rod bearings.

MAIN BEARING CAP BOLT OUTER DIAMETER

• Measure the outer diameters (d

1

) and (d

2

) at two positions as

shown in the figure.

• If reduction appears in places other than

range, regard it as (d

2

).

• If it exceeds the limit (a large difference in dimensions), replace

main bearing cap mounting bolt with a new one.

CONNECTING ROD CAP BOLT OUTER DIAMETER

JPBIA6347ZZ

: Example

Standard

: There must be crush height.

PBIC3279J

: Example

Standard

: There must be crush height.

PBIC3279J

: (d1) measuring position

: (d2) measuring position

Limit [(d

1

) – (d

2

)]: 0.15 mm (0.0059 in)

PBIC4015E