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Nissan Pathfinder (2010 year). Manual - part 373

EM-112

< DISASSEMBLY AND ASSEMBLY >

[VQ40DE]

ENGINE UNIT

21. Assembly is in the reverse order of disassembly after this step.

Inspection After Disassembly

INFOID:0000000005260477

CRANKSHAFT END PLAY

• Measure the clearance between thrust bearings and crankshaft

arm when crankshaft is moved fully forward or backward with dial

indicator.

• If the measured value exceeds the limit, replace thrust bearings,

and measure again. If it still exceeds the limit, replace crankshaft

also.

CONNECTING ROD SIDE CLEARANCE

• Measure the side clearance between connecting rod and crank-

shaft arm with feeler gauge.

• If the measured value exceeds the limit, replace connecting rod,

and measure again. If it still exceeds the limit, replace crankshaft

also.

PISTON TO PISTON PIN CLEARANCE

Piston Pin Hole Diameter

Measure the inner diameter of piston pin hole with inside microme-

ter.

Piston Pin Outer Diameter

Measure the outer diameter of piston pin with micrometer.

Piston to Piston Pin Oil Clearance

(Piston to piston pin oil clearance) = (Piston pin hole diameter) – (Piston pin outer diameter)

Standard

: 0.10 - 0.25 mm (0.0039 - 0.0098 in)

Limit

: 0.30 mm (0.0118 in)

PBIC2953E

Standard

: 0.20 - 0.35 mm (0.0079 - 0.0138 in)

Limit

: 0.40 mm (0.0157 in)

PBIC2954E

Standard

: 21.993 - 22.005 mm (0.8659 - 0.8663 in)

PBIC0116E

Standard

: 21.989 - 22.001 mm (0.8657 - 0.8662 in)

PBIC0117E

2010 Pathfinder

ENGINE UNIT

EM-113

< DISASSEMBLY AND ASSEMBLY >

[VQ40DE]

• If the calculated value is out of the standard, replace piston and piston pin assembly.

• When replacing piston and piston pin assembly, refer to

EM-123, "How to Select Piston and Bearing"

NOTE:

• Piston is available together with piston pin as assembly.

• Piston pin (piston pin hole) grade is provided only for the parts installed at the plant. For service parts, no

piston pin grades can be selected. (Only “0” grade is available.)

PISTON RING SIDE CLEARANCE

• Measure side clearance of piston ring and piston ring groove with

feeler gauge.

• If the measured value exceeds the limit, replace piston ring, and measure again.

If it still exceeds the limit, replace piston.

PISTON RING END GAP

• Make sure that the cylinder bore inner diameter is within the speci-

fication. Follow the "Cylinder Bore Inner Diameter" procedure.

• Lubricate with new engine oil to piston and piston ring, and then

insert piston ring until middle of cylinder with piston, and measure

the piston ring end gap with feeler gauge.

• If the measured value exceeds the limit, replace piston ring, and measure again.

CONNECTING ROD BEND AND TORSION

Standard

: 0.002 - 0.006 mm (0.0001 - 0.0002 in)

Standard:

Top ring

: 0.045 - 0.080 mm (0.0018 - 0.0031 in)

2nd ring

: 0.030 - 0.070 mm (0.0012 - 0.0028 in)

Oil ring

: 0.065 - 0.135 mm (0.0026 - 0.0053 in)

Limit:

Top ring

: 0.11 mm (0.0043 in)

2nd ring

: 0.10 mm (0.0039 in)

SEM024AA

Standard:

Top ring

: 0.23 - 0.33 mm (0.0091 - 0.0130 in)

2nd ring

: 0.33 - 0.48 mm (0.0130 - 0.0189 in)

Oil ring

: 0.20 - 0.50 mm (0.0079 - 0.0197 in)

Limit:

Top ring

: 0.56 mm (0.0220 in)

2nd ring

: 0.68 mm (0.0268 in)

Oil ring

: 0.85 mm (0.0335 in)

PBIC0118E

2010 Pathfinder

EM-114

< DISASSEMBLY AND ASSEMBLY >

[VQ40DE]

ENGINE UNIT

• Check with connecting rod aligner.

• If it exceeds the limit, replace connecting rod assembly.

CONNECTING ROD DIAMETER (BIG END)

• Install connecting rod bearing cap without installing connecting rod

bearing, and tightening connecting rod bolts to the specified

torque. Refer to

EM-102, "Disassembly and Assembly"

for the

tightening procedure.

• Measure the inner diameter of connecting rod big end with inside

micrometer.

• If out of the standard, replace connecting rod assembly.

CONNECTING ROD BUSHING OIL CLEARANCE (SMALL END)

Connecting Rod Bushing Inside Diameter (Small End)

Measure inside diameter of connecting rod bushing using suitable

tool.

Piston Pin Diameter

Bend:

Limit: 0.15 mm (0.0059 in) per 100 mm (3.94 in) length

Torsion:

Limit: 0.30 mm (0.0118 in) per 100 mm (3.94 in) length

PBIC2077E

Standard

: 57.000 - 57.013 mm (2.2441 - 2.2446 in)

PBIC1641E

Standard

: 22.000 - 22.012 mm (0.8661 - 0.8666 in)

PBIC0120E

2010 Pathfinder

ENGINE UNIT

EM-115

< DISASSEMBLY AND ASSEMBLY >

[VQ40DE]

Measure diameter of piston pin using suitable tool.

Connecting Rod Bushing Oil Clearance (Small End)

(Connecting rod bushing oil clearance) = (Connecting rod bushing inner diameter) – (Piston pin outer diame-

ter)

• If the calculated value exceeds the limit, replace connecting rod assembly and/or piston and piston pin

assembly.

• If replacing piston and piston pin assembly, refer to

EM-123, "How to Select Piston and Bearing"

• If replacing connecting rod assembly, follow the "CONNECTING

ROD BEARING OIL CLEARANCE" procedure to select the con-

necting rod bearing.

Factory installed parts grading:

• Only grade “0”.

Unit: mm (in)

*: After installing in connecting rod

CYLINDER BLOCK DISTORTION

• Remove any oil, scale, gasket, sealant and carbon deposits from the cylinder block surface.

CAUTION:

Do not allow any debris to enter engine oil or engine coolant passages.

Standard

: 21.989 - 22.001 mm (0.8657 - 0.8662 in)

PBIC0117E

Standard

: 0.005 - 0.017 mm (0.0002 - 0.0007 in)

Limit

: 0.030 mm (0.0012 in)

PBIC0809E

Grade

Connecting rod bushing
inner diameter *

22.000 - 22.006
(0.8661 - 0.8664)

22.006 - 22.012
(0.8664 - 0.8666)

Piston pin hole diameter

21.993 - 21.999
(0.8659 - 0.8661)

21.999 - 22. 005
(0.8661 - 0.8663)

Piston pin outer diameter

21.989 - 21.995
(0.8657- 0.8659)

21.995 - 22.001
(0.8659 - 0.8662)

PBIC2950E

2010 Pathfinder

EM-116

< DISASSEMBLY AND ASSEMBLY >

[VQ40DE]

ENGINE UNIT

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

different points in six directions with straightedge and feeler gauge.

• If it exceeds the limit, replace cylinder block.

MAIN BEARING HOUSING INNER DIAMETER

• Install lower cylinder block without installing main bearings, and

tighten lower cylinder block bolts to the specified torque. Refer to

EM-102, "Disassembly and Assembly"

for the tightening proce-

dure.

• Measure the inner diameter of main bearing housing with bore

gauge.

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

block as assembly.

NOTE:

Cylinder block cannot be replaced as a single part, because it is

machined together with lower cylinder block.

PISTON TO CYLINDER BORE CLEARANCE

Cylinder Bore Inner Diameter

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

and taper at six different points on each cylinder. (“X” and “Y” direc-

tions at “A”, “B” and “C”) (“X” is in longitudinal direction of engine)

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

and/or seizure on the cylinder inner wall, hone or re-bore the inner

wall.

Piston Skirt Diameter

Limit : 0.1 mm (0.004 in)

SEM123C

Standard

: 74.993 - 75.017 mm (2.9525 - 2.9534 in)

PBIC2012E

Standard inner diameter:

95.500 - 95.530 mm (3.7598 - 3.7610 in)

Out-of-round (Difference between “X” and “Y”):

0.015 mm (0.0006 in)

Taper limit (Difference between “A” and “C”):

0.01 mm (0.0004 in)

PBIC2955E

SEM843E

2010 Pathfinder

ENGINE UNIT

EM-117

< DISASSEMBLY AND ASSEMBLY >

[VQ40DE]

Measure the outer diameter of piston skirt with micrometer.

Piston to Cylinder Bore Clearance

Calculate by piston skirt diameter and cylinder bore inner diameter (direction “X”, position “B”).

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

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

EM-123, "How to

Select Piston and Bearing"

Re-boring Cylinder Bore

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

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

in final assembly.

3. 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.

4. Hone cylinders to obtain the specified piston to cylinder bore clearance.
5. Measure the finished cylinder bore for 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 micrometer.

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

CRANKSHAFT PIN JOURNAL DIAMETER

Measure point

: Distance from the top 43.03 mm (1.6941 in)

Standard

: 95.480 - 95.510 mm (3.7590 - 3.7602 in)

PBIC2956E

Standard

: 0.010 - 0.030 mm (0.0004 - 0.0012 in)

Limit

: 0.08 mm (0.0031 in)

Re-bored size calculation: D = A + B – C
where,

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

Standard

: 69.951 - 69.975 mm (2.7540 - 2.7549 in) dia.

2010 Pathfinder

EM-118

< DISASSEMBLY AND ASSEMBLY >

[VQ40DE]

ENGINE UNIT

• Measure the outer diameter of crankshaft pin journal with

micrometer.

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

clearance. Then use undersize bearing.

OUT-OF-ROUND AND TAPER OF CRANKSHAFT

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

main journal and pin journal with micrometer.

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

between (X) and (Y) at (A) and (B).

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

and (B) at (X) and (Y).

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

• 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.

CRANKSHAFT RUNOUT

• Place V-block on precise flat table, and support the journals on the

both end of crankshaft.

• Place dial indicator straight up on the No. 3 journal.

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

indicator. (Total indicator reading)

• If it exceeds the limit, replace crankshaft.

CONNECTING ROD BEARING OIL CLEARANCE

Method by Calculation

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

tighten connecting rod bolts to the specified torque. Refer to

EM-

102, "Disassembly and Assembly"

for the tightening procedure.

• Measure the inner diameter of connecting rod bearing with inside

micrometer.

(Bearing oil clearance) = (Connecting rod bearing inner diameter) –

(Crankshaft pin journal diameter)

• 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-123, "How to Select Piston and Bearing"

Standard

: 53.956 - 53.974 mm (2.1242 - 2.1250 in) dia.

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)

SBIA0535E

Standard : Less than 0.05 mm (0.002 in)
Limit

: 0.10 mm (0.0039 in)

SEM346D

Standard

: 0.034 - 0.059 mm (0.0013 - 0.0023 in) (actu-

al clearance)

Limit

: 0.070 mm (0.0028 in)

PBIC1642E

2010 Pathfinder

ENGINE UNIT

EM-119

< DISASSEMBLY AND ASSEMBLY >

[VQ40DE]

Method of Using Plastigage

• Remove oil and dust on crankshaft pin journal and the surfaces of each bearing completely.

• Cut 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 bolts to the specified

torque. Refer to

EM-102, "Disassembly and Assembly"

for the tightening procedure.

CAUTION:

Do not rotate crankshaft.

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

on 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 lower cylinder block,

and tighten lower cylinder block bolts to the specified torque. Refer

EM-102, "Disassembly and Assembly"

for the tightening proce-

dure.

• Measure the inner diameter of main bearing with bore gauge.

(Bearing clearance) = (Main bearing inner diameter) – (Crankshaft

main journal diameter)

• If the calculated value exceeds the limit, select proper main bearing according to main bearing inner diame-

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

EM-123, "How to

Select Piston and Bearing"

Method of Using Plastigage

• Remove engine oil and dust on crankshaft main journal and the surfaces of each bearing completely.

• Cut plastigage slightly shorter than the bearing width, and place it in crankshaft axial direction, avoiding oil

holes.

• Install main bearings to cylinder block and lower cylinder block, and tighten lower cylinder block bolts to the

specified torque. Refer to

EM-102, "Disassembly and Assembly"

for the tightening procedure.

CAUTION:

Do not rotate crankshaft.

• Remove lower cylinder block and bearings, and using scale on

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

PBIC1149E

Standard

: 0.035 - 0.045 mm (0.0014 - 0.0018 in)

(actual clearance)

Limit

: 0.065 mm (0.0026 in)

PBIC2204E

PBIC1149E

2010 Pathfinder

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