Nissan X-Trail 32. Manual - part 1127

CYLINDER BLOCK

EM-405

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

gauge. 

• If it exceeds the standard, replace cylinder block and main bearing

caps assembly. 
NOTE:
Main bearing caps cannot be replaced individually, because it is
machined together with the cylinder block.

PISTON TO CYLINDER BORE CLEARANCE

Cylinder Bore Inner Diameter

• Using a bore gauge, measure the cylinder bore for wear, out-of-round and taper at six different points on

each cylinder.

• If it exceeds the standard, or if there are scratches and/or seizure on the cylinder inner wall, replace cylinder

block. 

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.
(Clearance) = (Cylinder bore inner diameter) – (Piston skirt diameter)

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

CONNECTING ROD BEARING OIL CLEARANCE

Method by Calculation

: Cylinder block

: Main bearing cap

Standard : 

Refer 

to 

EM-417, "Cylinder Block"

.

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Standard:

Cylinder bore inner diameter 

: Refer to 

EM-417, "Cylinder Block"

.

Standard : 

Refer 

to 

EM-417, "Cylinder Block"

.

Measure point 

:  Refer  to 

EM-417, "Cylinder Block"

.

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Standard

: Refer to 

EM-417, "Cylinder Block"

.

EM-406

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CYLINDER BLOCK

• 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-390, "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 it exceeds the standard. Replace connecting rod bearing or/and connecting rod.

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-390, "Disassembly and Assembly"

.

CAUTION:

Never rotate crankshaft.

• Remove connecting rod cap and bearing, and using the scale on

the plastigage bag, measure the plastigage width. 
NOTE:
The procedure when the measured value exceeds the standard is
the same as that described in “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-390, "Disassembly and Assembly"

. 

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

• If it exceeds the standard, select proper main bearing according to

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

EM-421, "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 the crankshaft axial direction, avoiding

oil holes.

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

the specified torque. Refer to 

EM-390, "Disassembly and Assembly"

. 

CAUTION:

Never rotate crankshaft.

Standard : 

Refer 

to 

EM-421, "Connecting Rod Bear-

ing"

.

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Standard

: Refer to 

EM-421, "Main Bearing"

.

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CYLINDER BLOCK

EM-407

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• Remove main bearing cap and bearings, and using the scale on

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

FLYWHEEL INSPECTION

For a dual mass flywheel which has worked: presence of a free rotation angle. This angle is measured by fix-
ing the primary flywheel and turning the secondary flywheel. The dual mass flywheel free rotation angle must
not exceed 15

°

 or 30mm (1.2 in) in linear movement measured on the edge.

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EM-408

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HOW TO SELECT PISTON AND BEARING

HOW TO SELECT PISTON AND BEARING

Description

INFOID:0000000010784367

• 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.

Main Bearing

INFOID:0000000010784368

WHEN NEW CYLINDER BLOCK AND CRANKSHAFT ARE USED

1.

“Main Bearing Selection Table” rows correspond to main bearing
housing grade on rear side of cylinder block.
NOTE:
This engine only has one cylinder bore grade.

 : Cylinder block bearing diameter category:

• Identification by letter of the crankshaft bearing diameter,
• the order of the marking letters goes from the bearing on the

timing end to the bearing on  the flywheel end.

•

 : cylinder diameter category.

•

 : marking only for factory use.

WORKING OUT THE CLASS OF MAIN BEARING (ORIGINAL FITMENT)

Marking On The Crankshaft

Identify the category of crankshaft main journal diameter with checking the marking of crankshaft as shown in
the figures.
NOTE:
The marking has 5 digits. Left end is the diameter category of No. 1 bearing (flywheel side) and right end is the
diameter category of No. 5 bearing (sprocket side).
Detail of the marking:

 : Line indicating the diameter category of the journal.

- identification by letters corresponding to the diameter of the journal
- the order of the marking letters goes from the bearing on the timing
end to the bearing on the flywheel end,

 :Line indicating the diameter class of the crankpins,

Selection points

Selection parts 

Selection items

Selection methods

Between cylinder block and 
crankshaft

Main bearing

Main bearing grade
(bearing thickness)

Determined by match of cylinder block 
bearing housing grade (inner diameter of 
housing) and crankshaft journal grade 
(outer diameter of journal)

Piston protrusion

Piston

Piston grade (piston height)

Refer to 

EM-401, "Inspection"

.

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