Nissan X-Trail 32. Instruction - part 1090

CYLINDER BLOCK

EM-257

< UNIT DISASSEMBLY AND ASSEMBLY >

[QR25DE]

C

D

E

F

G

H

I

J

K

L

M

A

EM

N

P

O

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 oil clearance is out of the standard, replace piston and piston pin assembly. 
• When replacing piston and piston pin assembly, refer to "PISTON TO CYLINDER BORE CLEARANCE".

NOTE:
• Piston is available together with piston pin as assembly.
• Piston pin (piston pin hole) grade is provided only for the parts installed at the plant. For service parts, no

grades can be selected. (Only grade “0” is available.) 

PISTON RING SIDE CLEARANCE

• Measure the side clearance of piston ring and piston ring groove

with a feeler gauge (A).

• 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 cylinder bore inner diameter is within specification. Refer to “PISTON TO CYLINDER BORE

CLEARANCE”.

• Lubricate with new engine oil to piston 

 and piston ring 

, and

then insert 

 piston ring until middle of cylinder 

 with piston, and

measure piston ring end gap 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 cylinder block.

CONNECTING ROD BEND AND TORSION

Standard : 

Refer 

to 

EM-280, "Cylinder Block"

.

JSBIA2511ZZ

Standard : 

Refer 

to 

EM-280, "Cylinder Block"

.

Standard and Limit

: Refer to 

EM-280, "Cylinder Block"

.

JSBIA2512ZZ

Standard and Limit

: Refer to 

EM-280, 

"Cylinder Block"

.

JSBIA2513ZZ

EM-258

< UNIT DISASSEMBLY AND ASSEMBLY >

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CYLINDER BLOCK

• Check with a connecting rod aligner.

• If it exceeds the limit, replace connecting rod assembly.

CONNECTING ROD BIG END DIAMETER

• Install connecting rod cap 

 without connecting rod bearing

installed, and tightening connecting rod bolts to the specified
torque. Refer to 

EM-247, "Exploded View"

.

• Measure the inner diameter of connecting rod big end with an

inside micrometer.

• If out of the standard, replace connecting rod assembly.

CONNECTING ROD BUSHING OIL CLEARANCE

Connecting Rod Bushing Inner Diameter

Measure the inner diameter of connecting rod bushing with an inside
micrometer (A).

Piston Pin Outer Diameter

: Bend

: Torsion

C

: Feeler gauge

Limit

: Refer to 

EM-280, "Cylinder Block"

.

JSBIA2514ZZ

: Connecting rod

: Example

B

: Measuring direction of inner diameter

Standard : 

Refer 

to 

EM-280, "Cylinder Block"

.

JSBIA2521ZZ

Standard

: Refer to 

EM-280, "Cylinder Block"

.

JPBIA0223ZZ

CYLINDER BLOCK

EM-259

< UNIT DISASSEMBLY AND ASSEMBLY >

[QR25DE]

C

D

E

F

G

H

I

J

K

L

M

A

EM

N

P

O

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

Connecting Rod Bushing Oil Clearance

(Connecting rod bushing oil clearance) = (Connecting rod bushing inner diameter) – (Piston pin outer diame-
ter)

• If the measured value is out of the standard. Replace connecting rod assembly and/or piston and piston pin

assembly.

• If replacing piston and piston pin assembly. Refer to 

EM-265, "Piston"

.

• If replacing connecting rod assembly. Refer to 

EM-266, "Connecting Rod Bearing"

 to select connecting rod

bearing.

CYLINDER BLOCK DISTORTION

• Using a scraper, remove gasket on the cylinder block surface, and also remove engine oil, scale, carbon, or

other contamination. 

CAUTION:

Be careful not to allow gasket flakes to enter engine oil or engine coolant passages.

• Measure the distortion on the cylinder block upper face at some

different points in six directions with a straight edge (A) and a
feeler gauge (B).

• If it exceeds the limit, replace cylinder block.

MAIN BEARING HOUSING INNER DIAMETER

• Install lower cylinder block 

 without main bearings installed, and

tighten lower cylinder block mounting bolts to the specified torque.
Refer to 

EM-248, "Disassembly and Assembly"

 for the tightening

procedure.

• Measure the inner diameter of main bearing housing with a bore

gauge. 

• If out of the standard, replace cylinder block 

 and lower cylinder

block assembly. 
NOTE:
Cylinder block cannot be replaced as a single, because it is
machined together with lower cylinder block.

PISTON TO CYLINDER BORE CLEARANCE

Cylinder Bore Inner Diameter

Standard : 

Refer 

to 

EM-280, "Cylinder Block"

.

JPBIA0218ZZ

Standard

: Refer to 

EM-280, "Cylinder Block"

.

Limit : 

Refer 

to 

EM-280, "Cylinder Block"

.

JSBIA2526ZZ

Standard : 

Refer 

to 

EM-280, "Cylinder Block"

.

JPBIA0225ZZ

EM-260

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CYLINDER BLOCK

• 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. 

CAUTION:

When using an oversize piston, use oversize pistons for all cylinders with oversize piston rings.

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)

: 120 mm (4.72 in)

Standard:

Cylinder bore inner diameter 

: Refer to 

EM-280, "Cylinder Block"

.

Limit:

Out-of-round (Difference between 

 and 

)

Taper (Difference between 

 and 

)

: Refer to 

EM-280, "Cylinder Block"

.

Oversize (O/S): 0.2 mm (0.008 in)

JPBIA2059ZZ

Standard : 

Refer 

to 

EM-280, "Cylinder Block"

.

JPBIA0227ZZ

: Direction A

: Position C

: Position E

: 10 mm (0.39 in)

: 60 mm (2.36 in)

: 120 mm (4.72 in)

Standard and Limit 

: Refer to 

EM-280, "Cylinder Block"

.

JPBIA2059ZZ