Content .. 245 246 247 248 ..

Nissan Pathfinder (2006 year). Manual - part 247

CYLINDER BLOCK

EM-123

2006 Pathfinder

Inspection After Disassembly

EBS00QCC

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 crank-
shaft 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 crank-
shaft also.

PISTON TO PISTON PIN OIL 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)

●

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

Standard

: 0.14 - 0.22 mm (0.0055 - 0.0087 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

Standard

: 0.002 - 0.006 mm (0.0001 - 0.0002 in)

EM-124

CYLINDER BLOCK

2006 Pathfinder

●

When replacing piston and piston pin assembly, refer to

EM-118, "HOW TO SELECT PISTON"

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
specification. Refer to

EM-127, "Cylinder Bore Inner Diameter"

●

Lubricate with new engine oil to piston and piston ring, and then
insert piston ring until middle of cylinder with piston, and mea-
sure 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.

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

CYLINDER BLOCK

EM-125

2006 Pathfinder

CONNECTING ROD BEND AND TORSION

●

Check with connecting rod aligner.

●

If it exceeds the limit, replace connecting rod assembly.

CONNECTING ROD BIG END DIAMETER

●

Install connecting rod bearing cap without installing connecting
rod bearing, and tightening connecting rod bolts to the specified
torque. Refer to

EM-112, "ASSEMBLY"

for the tightening proce-

dure.

●

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
Connecting Rod Bushing Inner Diameter

Measure the inner diameter of connecting rod bushing with inside
micrometer.

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-126

CYLINDER BLOCK

2006 Pathfinder

Piston Pin Outer Diameter

Measure the outer diameter of piston pin with micrometer.

Connecting Rod Bushing Oil Clearance

(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-118, "HOW TO SELECT PISTON"

●

If replacing connecting rod assembly, refer to

EM-129, "CON-

NECTING ROD BEARING OIL CLEARANCE"

to select the

connecting rod bearing.

Factory installed parts grading:

●

Service parts apply only to grade “0”.

Unit: mm (in)

*: After installing in connecting rod

CYLINDER BLOCK DISTORTION

●

Using scraper, remove gasket on the cylinder block surface, and also remove engine oil, scale, carbon, or
other contamination.

CAUTION:

Be careful not to allow gasket flakes 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

CYLINDER BLOCK

EM-127

2006 Pathfinder

●

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-112, "ASSEMBLY"

for the tightening procedure.

●

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”
directions 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
satisfies the standard.

CAUTION:

When using oversize piston, use oversize pistons for all
cylinders with oversize piston rings.

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-128

CYLINDER BLOCK

2006 Pathfinder

Piston Skirt Diameter

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-118, "HOW

TO SELECT PISTON"

Re-boring Cylinder Bore

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

Install lower cylinder block, 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 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. Refer to

EM-

130, "MAIN BEARING OIL CLEARANCE"

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.

CYLINDER BLOCK

EM-129

2006 Pathfinder

CRANKSHAFT PIN JOURNAL DIAMETER

●

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. Refer to

EM-129,

"CONNECTING ROD BEARING OIL CLEARANCE"

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 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. Refer to

EM-130, "MAIN BEARING OIL CLEAR-

ANCE"

and/or

EM-129, "CONNECTING ROD BEARING OIL CLEARANCE"

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-

112, "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)

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 (0.0020 in)

Limit

: 0.10 mm (0.0039 in)

SEM346D

Standard

: 0.034 - 0.059 mm (0.0013 - 0.0023 in)

(actual clearance)

Limit

: 0.070 mm (0.0028 in)

PBIC1642E

EM-130

CYLINDER BLOCK

2006 Pathfinder

●

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-119, "HOW TO SELECT CONNECTING ROD BEARING"

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 speci-
fied torque. Refer to

EM-112, "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 to

EM-112, "ASSEMBLY"

for the tightening procedure.

●

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

EM-120, "HOW TO SELECT MAIN 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-112, "ASSEMBLY"

for the tightening procedure.

CAUTION:

Do not rotate crankshaft.