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Nissan Teana J32. Manual - part 500

EM-124

< DISASSEMBLY AND ASSEMBLY >

CYLINDER BLOCK

• If the measured value exceeds the limit, or if there are scratches

and/or seizure on the cylinder inner wall, hone or rebore the inner
wall.

• Oversize piston is provided. When using oversize piston, rebore

cylinder so that the clearance of the piston to cylinder bore satis-
fies the standard.

CAUTION:

When using oversize piston, use oversize pistons for all cylin-
ders 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 (B), position (D)].
(Clearance) = (Cylinder bore inner diameter) – (Piston skirt diameter).

• If the calculated value exceeds the limit, replace piston and piston pin assembly. Refer to

EM-129, "Piston"

Reboring Cylinder Bore

Cylinder bore size is determined by adding piston to cylinder bore clearance to piston skirt diameter.

Install main bearing caps and main bearing beam, and tighten to the specified torque. Otherwise, cylinder
bores may be distorted in final assembly.

Cut cylinder bores.
NOTE:
• When any cylinder needs boring, all other cylinders must also be bored.
• Do not cut too much out of cylinder bore at a time. Cut only 0.05 mm (0.0020 in) or so in diameter at a

time.

Hone cylinders to obtain the specified piston to cylinder bore clearance.

Measure finished cylinder bore for the out-of-round and taper.
NOTE:
Measurement should be done after cylinder bore cools down.

CRANKSHAFT MAIN JOURNAL DIAMETER

• Measure the outer diameter of crankshaft main journals with a micrometer.

Oversize (O/S)

: 0.2 mm (0.008 in)

SEM843E

Measure point

: Refer to

EM-143, "Cylinder Block"

Standard

JPBIA0227ZZ

Standard and limit

: Refer to

EM-143, "Cylinder Block"

Rebored size calculation: D = A + B – C

where,

A: Piston skirt diameter as measured

B: Piston to cylinder bore clearance (standard value)

C: Honing allowance 0.02 mm (0.0008 in)

D: Bored diameter

Standard

: Refer to

EM-143, "Cylinder Block"

CYLINDER BLOCK

EM-125

< DISASSEMBLY AND ASSEMBLY >

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

EM-

132, "Main Bearing"

CRANKSHAFT PIN JOURNAL DIAMETER

• Measure the outer diameter of crankshaft pin journal with a

micrometer (A).

• If out of the standard, measure the connecting rod bearing oil

clearance. Then use undersize bearing. Refer to

EM-130,

"Connecting Rod Bearing"

CRANKSHAFT OUT-OF-ROUND AND TAPER

• 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 the dimensions

between (d) and (c) at (a) and (b).

• Taper is indicated by the difference in the dimensions between.

• If the measured value exceeds the limit, correct or replace crank-

shaft.

• If corrected, measure the bearing oil clearance of the corrected

main journal and/or pin journal. Then select the main bearing and/
or connecting rod bearing. Refer to

EM-132, "Main Bearing"

and/

EM-130, "Connecting Rod Bearing"

CRANKSHAFT RUNOUT

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

dial indicator. (Total indicator reading)

• If it exceeds the limit, replace crankshaft.

CONNECTING ROD BEARING OIL CLEARANCE

Method by Calculation

• Install connecting rod bearings (1) to connecting rod (2) and con-

necting rod cap, and tighten connecting rod bolts to the specified
torque. Refer to

EM-110, "Disassembly and Assembly"

for the

tightening procedure.

• Measure the inner diameter of connecting rod bearing with an

inside micrometer.

(Oil clearance) = (Connecting rod bearing inner diameter) – (Crank-
shaft pin journal diameter)

Standard

: Refer to

EM-143, "Cylinder Block"

JPBIA0228ZZ

Limit

: Refer to

EM-143, "Cylinder Block"

JPBIA0229ZZ

Standard and limit

: Refer to

EM-143, "Cylinder Block"

SEM346D

Standard and limit

: Refer to

EM-147,

"Connecting Rod Bearing"

JPBIA0230ZZ

EM-126

< DISASSEMBLY AND ASSEMBLY >

CYLINDER BLOCK

• If the calculated value exceeds the limit, select proper connecting rod bearing according to connecting rod

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

EM-130, "Connecting Rod Bearing"

Method of Using Plastigage

• Remove oil and dust on crankshaft pin 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.

• Install connecting rod bearings to connecting rod and connecting rod bearing cap, and tighten connecting

rod bolts to the specified torque. Refer to

EM-110, "Disassembly and Assembly"

for the tightening proce-

dure.

CAUTION:

Never rotate crankshaft.

• Remove connecting rod 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 limit is
same as that described in the “Method by Calculation”.

MAIN BEARING OIL CLEARANCE

Method by Calculation

• Install main bearings (3) to cylinder block (1) and main bearing

caps (2), and main bearing cap bolts with main bearing beam to
the specified torque. Refer to

EM-110, "Disassembly and Assem-

bly"

for the tightening procedure.

• Measure the inner diameter of main bearing with a bore gauge.
(Oil clearance) = (Main bearing inner diameter) – (Crankshaft main
journal diameter)

• If the calculated value exceeds the limit, select proper main bear-

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

EM-132, "Main Bearing"

Method of Using Plastigage

• Remove engine oil and dust on crankshaft 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.

• Install main bearing to cylinder block and main bearing caps, and tighten main bearing cap bolts with main

bearing beam to the specified torque. Refer to

EM-110, "Disassembly and Assembly"

for the tightening pro-

cedure.

CAUTION:

Never rotate crankshaft.

JPBIA0231ZZ

Standard and limit

: Refer to

EM-146, "Main Bearing"

JPBIA0232ZZ

CYLINDER BLOCK

EM-127

< DISASSEMBLY AND ASSEMBLY >

• Remove main bearing caps and bearings, and using the scale 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 (1) installed, the tip end of
bearing must protrude. Refer to

EM-110, "Disassembly and

Assembly"

for the tightening procedure.

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

CONNECTING ROD BEARING CRUSH HEIGHT

• When connecting rod bearing cap is removed after being tightened

to the specified torque with connecting rod bearings (1) installed,
the tip end of bearing must protrude. Refer to

EM-110, "Disassem-

bly and Assembly"