Nissan X-Trail 32. Manual - part 1056

CYLINDER BLOCK

EM-121

< UNIT DISASSEMBLY AND ASSEMBLY >

[MR20DD]

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• 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-107, "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-125,

"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-107, "Disassembly and Assembly"

.

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-107, "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-127, "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-140, "Connecting Rod Bearing"

.

PBIC3275J

JPBIA6346ZZ

: Example

: Inner diameter measuring direction

Standard and Limit

: Refer to 

EM-141, "Main Bearing"

.

PBIC3277J

EM-122

< 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-107, "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-107, "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-107, "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

CYLINDER BLOCK

EM-123

< UNIT DISASSEMBLY AND ASSEMBLY >

[MR20DD]

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• Measure the outer diameter (d) at position as shown in the figure.
• If reduction appears in a position other than (d), regard it as (d).

• When (d) exceeds the limit (when it becomes thinner), replace

connecting rod cap bolt with a new one.

CLOGGED OR DAMAGED OIL FILTER (FOR VALVE TIMING CONTROL)

• Check that there is no foreign material on the oil filter and check it

for clogging.

- Clean it if necessary.
• Check the oil filter for damage.
- Replace it if necessary.

Limit: 7.75 mm (0.3051 in) 

PBIC4016E

PBIC3273J

EM-124

< UNIT DISASSEMBLY AND ASSEMBLY >

[MR20DD]

HOW TO SELECT PISTON AND BEARING

HOW TO SELECT PISTON AND BEARING

Description

INFOID:0000000010783735

• The identification grade stamped on each part is the grade for the dimension measured in new condition.

This grade cannot apply to reused parts. 

• For reused or repaired parts, measure the dimension accurately. Determine the grade by comparing the

measurement with the values of each selection table.

• For details of the measurement method of each part, the reuse standards and the selection method of the

selective fitting parts, refer to the text.

Piston

INFOID:0000000010783736

WHEN NEW CYLINDER BLOCK IS USED

• Check the cylinder bore grade on rear left side of cylinder block 

,

and select piston of the same grade.

• If there is a correction stamp mark on the cylinder block, use it as a

correct reference.

WHEN CYLINDER BLOCK IS REUSED

1.

Measure the cylinder bore inner diameter. Refer to 

EM-137, "Cylinder Block"

.

2.

Determine the bore grade by comparing the measurement with the values under the cylinder bore inner
diameter of the “Piston Selection Table”.

Selection points

Selection parts 

Selection items

Selection methods

Between cylinder block and 
crankshaft

Main bearing

Main bearing grade (bearing 
thickness)

Determined by match of cylin-
der block bearing housing 
grade (inner diameter of hous-
ing) and crankshaft journal 
grade (outer diameter of jour-
nal)

Between crankshaft and con-
necting rod

Connecting rod bearing

Connecting rod bearing grade 
(bearing thickness)

Combining service grades for 
connecting rod big end diame-
ter and crankshaft pin outer di-
ameter determine connecting 
rod bearing selection.

Between cylinder block and pis-
ton

Piston and piston pin assembly
(piston is available together with 
piston pin as an assembly.)

Piston grade (piston outer diam-
eter)

Piston grade = cylinder bore 
grade (inner diameter of bore)

: Correction stamp

: Standard stamp

: Cylinder No. 1 bore grade

: Cylinder No. 2 bore grade

: Cylinder No. 3 bore grade

: Cylinder No. 4 bore grade

: No. 1 main bearing housing grade

: No. 2 main bearing housing grade

: No. 3 main bearing housing grade

: No. 4 main bearing housing grade

: No. 5 main bearing housing grade

: Engine front

PBIC3264J