Nissan Pathfinder (2008 year). Manual - part 369

ENGINE UNIT

EM-115

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• When installing, align connecting rod bearing stopper protru-

sion with cutout of connecting rods and connecting rod bearing
caps to install. 

• Ensure the oil hole on connecting rod and that on the corre-

sponding bearing are aligned. 

12. Install piston and connecting rod assembly to crankshaft. 
13. Position crankshaft pin corresponding to connecting rod to be installed onto the bottom dead center.

14. Apply engine oil sufficiently to the cylinder bore, piston and crankshaft pin journal.

15. Match the cylinder position with the cylinder number on connecting rod to install. 

NOTE:
Be sure that front mark on piston head is facing front of engine.

16. Install piston with the front mark on the piston head facing the

front of engine using Tool.

CAUTION:

Be careful not to damage the cylinder wall and crankshaft
pin, resulting from an interference of the connecting rod big
end.

17. Install connecting rod bearing cap.

• Match the stamped cylinder number marks on connecting rod

with those on connecting rod bearing cap to install.

• Be sure that front mark on connecting rod bearing cap is fac-

ing front of engine.

18. Tighten connecting rod bolts as follows:
a.

Apply engine oil to the threads and seats of connecting rod bolts. 

b.

Tighten connecting rod bolts.

PBIC2067E

Tool number

: EM03470000 (J-8037)

WBIA0585E

PBIC0809E

Connecting rod bolt 

: 19.6 N·m (2.0 kg-m, 14 ft-lb)

EM-116

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ENGINE UNIT

c.

Then tighten all connecting rod bolts 90

°

 clockwise.

CAUTION:

Always use Tool. Avoid tightening based on visual check
alone.

• After tightening connecting rod bolts, make sure that crank-

shaft rotates smoothly.

• Check the connecting rod side clearance. Refer to 

EM-117,

"Inspection After Disassembly"

.

19. Install pilot converter.

• With drift of the following outer diameter, press-fit as far as it

will go.

• Press-fit pilot converter with its chamfer facing crankshaft as

shown. 

20. Install knock sensors.

• Install knock sensor so that connector faces rear of engine.
• After installing knock sensor, connect harness connector, and

lay it out to rear of engine.

CAUTION:

• Do not tighten bolts while holding connector.   
• If any impact by dropping is applied to knock sensor,

replace it with new one.

NOTE:
• Make sure that there is no foreign material on the cylinder

block mating surface and the back surface of knock sensor. 

• Make sure that knock sensor does not interfere with other

parts.

Tool number

: KV10112100 (BT-8653-A)

WBIA0586E

Pilot converter

: Approx. 33 mm (1.30 in)

PBIC2947E

SEM537E

PBIC2948E

ENGINE UNIT

EM-117

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21. Assemble in the reverse order of disassembly after this step.

Drive plate 

• Install drive plate and reinforcement plate as shown.
• Holding ring gear using Tool.

• Tighten bolts crosswise over several times.

Inspection After Disassembly

INFOID:0000000001281999

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

Tool number

: KV10117700 (J-44716)

PBIC0910E

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

EM-118

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ENGINE UNIT

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)

• 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-127, "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 also.

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. If it still exceeds the limit,

re-bore cylinder and use oversize piston and piston rings.

CONNECTING ROD BEND AND TORSION

Standard

: 21.989 - 22.001 mm (0.8657 - 0.8662 in)

PBIC0117E

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

ENGINE UNIT

EM-119

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• 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-106, "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

EM-120

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ENGINE UNIT

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-127, "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

                    0

                    1

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

ENGINE UNIT

EM-121

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• 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-106, "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.

• Oversize piston is provided. When using oversize piston, re-bore

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

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)

Oversize (OS)

: 0.2 mm (0.008 in)

PBIC2955E

SEM843E

EM-122

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ENGINE UNIT

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-127, "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 finished the 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. Follow the

"MAIN BEARING OIL CLEARANCE" procedure.

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.