Nissan Titan A60. Manual - part 479

 

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Nissan Titan A60. Manual - part 479

 

 

ENGINE UNIT

EM-101

< UNIT DISASSEMBLY AND ASSEMBLY >

C

D

E

F

G

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K

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A

EM

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• Install the main bearing caps with the main bearings removed, and

tighten the bolts to the specified torque. Refer to 

EM-89, "Disas-

sembly and Assembly"

.

• Measure inside diameter of main bearing housing.

• If out of the standard, replace cylinder block and main bearing

caps as an assembly. 

NOTE:

These components must be replaced as a single unit, because

they were processed together.

PISTON TO CYLINDER BORE CLEARANCE

Cylinder Bore Diameter

• Measure the cylinder bore for wear, out-of-round and taper at six

different points on each cylinder (

″X″ and ″Y″ directions at ″A″, ″B″

and 

″C″).

NOTE:

When determining cylinder bore grade, measure cylinder bore at 

"B" position.

• If measured value exceeds the repair limit, or if there are scratches and/or seizure on the cylinder inner wall,

hone or bore the inner wall. 

Piston Skirt Diameter

• Measure piston skirt diameter using suitable tool.

Standard

: 68.944 - 68.968 mm (2.7143 - 2.7153 in)

PBIC1643E

PBIC0123E

Standard diameter:

98.000 - 98.030 mm (3.8583 - 3.8594 in)

Wear limit:

0.20 mm (0.0079 in)

Out-of-round (Difference between 

X and Y):

Limit: 0.015 mm (0.0006 in)

Taper limit (Difference between 

A and C):

Limit: 0.010 mm (0.0004 in)

PBIC0124E

Standard

: 97. 980 - 98. 010 mm (3.8575 - 3.8587 in)

PBIC0125E

EM-102

< UNIT DISASSEMBLY AND ASSEMBLY >

ENGINE UNIT

• Measure point 

″H″.

Piston to Cylinder Bore Clearance

• Calculate by using diameter of the piston skirt and the cylinder bore diameter (direction X, position B).

(Clearance) = (Cylinder bore diameter) – (piston skirt diameter)

• If calculation 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”.

2. Install main bearing caps, and tighten them to the specified torque. Otherwise, cylinder bores may be dis-

torted in final assembly.

3. Cut the 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 one time. Cut only 0.05 mm (0.0020 in) or so in diameter at a

time.

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

NOTE:

Measurement should be done after cylinder bore cools down.

CRANKSHAFT JOURNAL DIAMETER

• Measure diameter of crankshaft journals.

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

CRANKSHAFT PIN DIAMETER

Distance from the top

: 39 mm (1.54 in)

KBIA2545E

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

Standard

: 63.940 - 63.964 mm (2.5173 - 2.5183 in)

ENGINE UNIT

EM-103

< UNIT DISASSEMBLY AND ASSEMBLY >

C

D

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• Measure diameter of crankshaft pin using suitable tool.

• If measurement is out of standard, measure connecting rod bear-

ing oil clearance. Then use undersize bearing. 

OUT-OF-ROUND AND TAPER OF CRANKSHAFT

• Measure dimensions at four different points as shown on each

journal and pin. 

• Out-of-roundness is indicated by the difference in dimension

between 

″X″ and ″Y″ at ″A″ and ″B″.

• Taper is indicated by the difference in dimension between 

″A″ and

″B″ at ″X″ and ″Y″.

• If measured value exceeds the standard, correct or replace crankshaft.

• If corrected, measure the bearing oil clearance of the corrected journal or pin. Then select the main bearing

or connecting rod bearing. 

CRANKSHAFT RUNOUT

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

both ends of the crankshaft.

• Measure at No. 3 journal using suitable tool. 

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

• Half of the movement shows the runout.

• If measurement exceeds the limit, replace crankshaft.

 CONNECTING ROD BEARING OIL CLEARANCE

Method of Measurement

• Install connecting rod bearings to the connecting rod and cap. Tighten connecting rod bolts to the specified

torque. Refer to 

EM-89, "Disassembly and Assembly"

.

Measure inside diameter of connecting rod bearing.

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

(Crankshaft pin diameter)

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

shaft pin and use undersized bearing. Refer to 

EM-107, "How to

Select Piston and Bearing"

.

Method of Using Plastigage

Standard

: 53.956 - 53.974 mm (2.1243 - 2.1250 in)

PBIC0127E

Limit

Out-of-round (Difference between 

X and Y)

: 0.002 mm (0.0001 in)

Taper (Difference between 

A and B)

: 0.002 mm (0.0001 in)

PBIC1685E

Limit

: Less than 0.05 mm (0.002 in)

PBIC0129E

Standard

: 0.020 - 0.039 mm (0.0008 - 0.0015 in)

Limit

: 0.055 mm (0.0022 in)

PBIC1642E

EM-104

< UNIT DISASSEMBLY AND ASSEMBLY >

ENGINE UNIT

• Remove oil and dust on the crankshaft pin and 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 the connecting rod bearings to the connecting rod and con-

necting rod bearing cap, and tighten the connecting rod bolts to the

specified torque. 

CAUTION:

Do not rotate crankshaft with plastigage installed.

• Remove the connecting rod bearing cap and bearings. Measure

the plastigage width using the scale on the plastigage bag.

NOTE:

The procedure when the measured value exceeds the repair limit is the same as that described in “Method

of Measurement”.

MAIN BEARING OIL CLEARANCE

Method of Measurement

• Install the main bearings to the cylinder block and main bearing

cap. Measure the main bearing inside diameter with the bearing

cap bolts tightened to the specified torque. Refer to 

EM-89, "Disas-

sembly and Assembly"

.

(Oil clearance) = (Inside diameter of main bearing) – (Crankshaft

journal diameter)

• If measured value exceeds the repair limit, select main bearings referring to the main bearing inside diame-

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

EM-107, "How

to Select Piston and Bearing"

.

Method of Using Plastigage

• Remove oil and dust on the crankshaft journal and 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 the main bearings to the cylinder block and main bearing

cap, and tighten the main bearing bolts to the specified torque. 

CAUTION:

Do not rotate crankshaft with plastigage installed.

• Remove bearing cap and bearings. Measure plastigage width

using the scale on the plastigage bag.

NOTE:

The procedure when the measured value exceeds the repair limit

is the same as that described in “Method of Measurement”.

CRUSH HEIGHT OF MAIN BEARING

KBIA2550E

Standard:

No. 1 and 5 journals

: 0.001 - 0.011 mm (0.00004 - 0.0004 in)

No. 2, 3 and 4 journals

: 0.007 - 0.017 mm (0.0003 - 0.0007 in)

Limit:

No.1 and 5 journals

: 0.021 mm (0.0008 in)

No. 2, 3 and 4 journals

: 0.027 mm (0.0011 in)

PBIC1644E

KBIA2551E

 

 

 

 

 

 

 

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