Nissan Altima HL32 Hybrid. Manual - part 393

EM-86

< DISASSEMBLY AND ASSEMBLY >

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CYLINDER BLOCK

• Measure outer diameter of piston pin. Refer to 

EM-98, "Standard

and Limit"

.

Connecting Rod Bushing Oil Clearance (Small End)

(Connecting rod small end oil clearance) = (Inner diameter of con-

necting rod small end) – (Outer diameter of piston pin)

• If the measured value exceeds the standard, replace the connect-

ing rod assembly and/or piston and piston pin assembly.

• If replacing the piston and piston pin assembly, use the "Piston

Selection Table" to select the piston corresponding to the applica-

ble bore grade of the cylinder block to be used. Refer to 

EM-91,

"How to Select Piston and Bearing"

.

Factory Installed Parts Grading:

• Service parts apply only to piston pin grade 0 (B).

Unit: mm (in)

• A: Front mark

• C: Piston grade I.D. stamp

• D: Piston crown I.D. code stamp

CYLINDER BLOCK DISTORTION

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

contamination. 

CAUTION:

Be careful not to allow gasket debris to enter the oil or coolant passages.

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

points in 6 directions.

• If out of the distortion limit, replace the cylinder block and lower

block they are machined together as an assembly.

INNER DIAMETER OF MAIN BEARING HOUSING

• Install the main bearing caps with the main bearings removed and tighten the bolts to the specified torque.

Refer to 

EM-75, "Disassembly and Assembly"

.

PBIC0117E

Standard

: 0.005 - 0.017 mm (0.0002 - 0.0007 in)

Piston Pin Grade (B)

0

1

Connecting rod small end 
inner diameter

         20.000 - 20.006          
       (0.7874 - 0.7876)

         20.006 - 20.012
        (0.7876 - 0.7879)

Piston pin outer diameter

        19.989 - 19.995
       (0.7870 - 0.7872)

         19.995 - 20.001
        (0.7872 - 0.7874)

Piston pin bore diameter

        19.993 - 19.999
       (0.7871- 0.7874)

         19.999 - 20.005
        (0.7874 - 0.7876)

SBIA0282E

ALBIA0209ZZ

Limit

: 0.1 mm (0.004 in)

PBIC0121E

CYLINDER BLOCK

EM-87

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• Using a bore gauge, measure the inner diameter of the main bear-

ing housing. 

• If out of the standard, replace the cylinder block and lower cylinder

block assembly. 

NOTE:

These components cannot be replaced as a single unit because

they were processed together.

PISTON TO CYLINDER BORE CLEARANCE

Inner Diameter of Cylinder Bore

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

and taper at 6 different points on each cylinder. (X and Y directions

at A, B and C). The Y axis is in the longitudinal direction of the

engine.

NOTE:

When determining cylinder bore grade, measure cylinder bore at B

position. Refer to 

EM-98, "Standard and Limit"

.

• If there are scratches and/or seizure on the cylinder inner wall,

hone the inner wall. 

Outer Diameter of Piston

• Measure piston skirt diameter using a micrometer. Refer to 

EM-98,

"Standard and Limit"

.

• Measuring point (distance from the top): 37.5 mm (1.476 in)

Piston to Cylinder Bore Clearance

• Calculate by outer diameter of piston skirt and inner diameter of cylinder (direction X, position B).

(Clearance) = (Inner diameter of cylinder) – (Outer diameter of piston skirt).

• If it exceeds the limit, replace piston/piston pin assembly.

Reboring Cylinder Bore

1. Cylinder bore size is determined by adding piston-to-bore clearance to piston diameter “A”.

Standard

: 58.944 - 58.967 mm (2.3206 - 2.3215 in)

PBIC0269E

SBIA0284E

PBIC0125E

Standard

: 0.010 - 0.030 mm (0.0004 - 0.0012 in)

Limit

: 0.08 mm (0.0031 in)

Rebored size calculation: D = A + B - C

D: Bored diameter
A: Piston diameter as measured
B: Piston-to-bore clearance (standard value)
C: Honing allowance 0.02 mm (0.0008 in)

EM-88

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CYLINDER BLOCK

2. Install lower cylinder block, and tighten to the specified torque. Otherwise, cylinder bores may be distorted

in final assembly.

3. Cut cylinder bores.

• 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.

4. Hone cylinders to obtain specified piston-to-bore clearance.
5. Measure finished cylinder bore for out-of-round and taper.

• Measurement should be done after cylinder bore cools down.

OUTER DIAMETER OF CRANKSHAFT JOURNAL

• Measure outer diameter of crankshaft journals.

OUTER DIAMETER OF CRANKSHAFT PIN

• Measure outer diameter of crankshaft pin.

OUT-OF-ROUND AND TAPER OF CRANKSHAFT

• Measure the dimensions at four different points as shown on each

journal and pin using a micrometer. 

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

(X) and (Y) at (A) and (B).

• Taper is indicated by the difference in dimension between (A) and

(B) at (X) and (Y).

CRANKSHAFT RUNOUT

• Place a V-block on a precise flat table to support the journals on

both ends of the crankshaft.

• Place a dial gauge straight up on the No. 3 journal. 

• While rotating the crankshaft, read the movement of the pointer on

the dial gauge, the total indicator reading. 

OIL CLEARANCE OF CONNECTING ROD BEARING

Method of Measurement

Standard

: 54.955 - 54.979 mm (2.1636 - 2.1645 in)

Standard

: 44.956 - 44.974 mm (1.7699 - 1.7706 in)

PBIC0270E

Limit
Out-of-round (X - Y)

: 0.005 mm (0.0002 in)

Taper (A - B)

: 0.005 mm (0.0002 in)

PBIC0128E

Limit

: Less than 0.05 mm (0.002 in)

PBIC0271E

CYLINDER BLOCK

EM-89

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• Install the connecting rod bearings to the connecting rod and the

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

Using a inside micrometer measure the inner diameter of connect-

ing rod bearing.

(Oil clearance) = (Inner diameter of connecting rod bearing) –

(Outer diameter of crankshaft pin)

• If clearance cannot be adjusted within the standard, grind crank-

shaft pin and use undersized bearing. Refer to 

EM-91, "How to

Select Piston and Bearing"

.

Method of Using Plastigage

• Remove oil and dust on the crankshaft pin and the surfaces of

each bearing completely. 

• Cut the Plastigage slightly shorter than the bearing width, and

place it in crankshaft axial direction, avoiding oil holes.

• Install the connecting rod bearings to the connecting rod cap, and

tighten the connecting rod bolts to the specified torque. 

CAUTION:

Never rotate the crankshaft.

• Remove the connecting rod 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.

OIL CLEARANCE OF MAIN BEARING

Method of Measurement

• Install the main bearings to the cylinder block and bearing cap. Measure the main bearing inner diameter

with the bearing cap bolt tightened to the specified torque. 

(Oil clearance) = (Inner diameter of main bearing) – (Outer diameter of crankshaft journal)

• If the measured value exceeds the limit, select main bearings referring to the main bearing inner diameter

and crankshaft journal outer diameter, so that the oil clearance satisfies the standard. Refer to 

EM-91, "How

to Select Piston and Bearing"

.

Method of Using Plastigage

• Remove oil and dust on the crankshaft journal and the surfaces of

each bearing completely. 

• Cut the Plastigage slightly shorter than the bearing width, and

place it in crankshaft axial direction, avoiding oil holes.

• Tighten the main bearing bolts to the specified torque. 

CAUTION:

Never rotate the crankshaft.

• Remove the 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".

CRUSH HEIGHT OF MAIN BEARING

Standard

: 0.035 - 0.045 mm (0.0014 - 0.0018 in)

Limit

: 0.10 mm (0.0039 in)

PBIC0119E

EM142

Standard:
No. 1, 3, and 5 journals

: 0.012 - 0.022 mm (0.0005 - 0.0009 in)

No. 2 and 4 journals

: 0.018 - 0.028 mm (0.0007 - 0.0011 in)

Limit

: 0.1 mm (0.004 in)

EM142