Nissan Primera P11. Instruction — part 399
If out of specification, replace piston ring. If gap exceeds maximum
limit with a new ring, rebore cylinder and use oversized piston and
piston rings.
Refer to SDS, EM-185.
I
When replacing the piston, check the cylinder block surface for
scratches or seizure. If scratches or seizure is found, hone or
replace the cylinder block.
CONNECTING ROD BEND AND TORSION
NCEM0026S04
Bend:
Limit 0.15 mm (0.0059 in)
per 100 mm (3.94 in) length
Torsion:
Limit 0.3 mm (0.012 in)
per 100 mm (3.94 in) length
If it exceeds the limit, replace connecting rod assembly.
CYLINDER BLOCK DISTORTION AND WEAR
NCEM0026S05
Clean upper surface of cylinder block.
Use a reliable straightedge and feeler gauge to check the flatness
of cylinder block surface. Check along six positions shown in fig-
ure.
Block surface flatness:
Standard Less than 0.03 mm (0.0012 in)
Limit 0.10 mm (0.004 in)
If out of specification, resurface it.
The limit for cylinder block resurfacing is determined by the amount
of cylinder head resurfacing.
Amount of cylinder head resurfacing is “A”.
Amount of cylinder block resurfacing is “B”.
The maximum limit is as follows:
A + B = 0.2 mm (0.008 in)
Nominal cylinder block height
from crankshaft center:
213.95 - 214.05 mm (8.4232 - 8.4271 in)
If necessary, replace cylinder block.
SEM150B
Feeler gauge
SEM003F
Torsion
Feeler gauge
SEM486C
Feeler gauge
Straightedge
SEM102F
213.95
-
214.05
mm
(8.4232
-
8.4271
in)
CYLINDER BLOCK
QG
Inspection (Cont’d)
EM-55
PISTON-TO-BORE CLEARANCE
NCEM0026S06
1.
Using a bore gauge, measure cylinder bore for wear, out-of-
round and taper.
Standard inner diameter:
Refer to SDS, EM-184
Wear limit:
0.2 mm (0.008 in)
Out-of-round (X − Y) standard:
Less than 0.015 mm (0.0006 in)
Taper (A − B) standard:
Less than 0.01 mm (0.0004 in)
If it exceeds the limit, rebore all cylinders. Replace cylinder
block if necessary.
2.
Check for score and seizure. If seizure is found, hone it.
I
If cylinder block or piston is replaced, match piston grade
with grade number on cylinder block lower surface.
3.
Measure piston skirt diameter.
Piston diameter “A”:
Refer to SDS, EM-185.
Measuring point “a” (Distance from the top):
Refer to SDS, EM-185
4.
Check that piston-to-bore clearance is within specification.
Piston-to-bore clearance = Cylinder bore measure-
ment “B” − Piston diameter “A”:
Refer to SDS, EM-185
5.
Determine piston oversize according to amount of cylinder
wear.
Oversize pistons are available for service. Refer to SDS
EM-185.
6.
Cylinder bore size is determined by adding piston-to-bore
clearance to piston diameter “A”.
Rebored size calculation:
D = A + B − C
where,
D: Bored diameter
A: Piston diameter as measured
B: Piston-to-bore clearance
C: Honing allowance 0.02 mm (0.0008 in)
7.
Install main bearing caps and tighten bolts to the specified
torque. This will prevent distortion of cylinder bores.
8.
Cut cylinder bores.
I
When any cylinder needs boring, all other cylinders must
also be bored.
I
Do not cut too much out of cylinder bore at a time. Cut
only 0.05 mm (0.0020 in) or so at a time.
9.
Hone cylinders to obtain specified piston-to-bore clearance.
10. Measure finished cylinder bore for out-of-round and taper.
I
Measurement should be done after cylinder bore cools
down.
SEM166D
20
(0.79)
60
(2.36)
100
(3.94)
Unit: mm (in)
SEM929F
Front
Cylinder bore
grade number
(1, 2, 3)
Cylinder
block
No.2
No.4
No.1
No.3
SEM258C
CYLINDER BLOCK
QG
Inspection (Cont’d)
EM-56
CRANKSHAFT
NCEM0026S07
1.
Check crankshaft main and pin journals for score, wear or
cracks.
2.
With a micrometer, measure journals for taper and out-of-
round.
Out-of-round (X − Y):
Less than 0.003 mm (0.0001 in)
Taper (A − B):
Less than 0.004 mm (0.0002 in)
3.
Measure crankshaft runout.
Runout (Total indicator reading):
Less than 0.04 mm (0.0016 in)
BEARING CLEARANCE
NCEM0026S08
I
Use Method A or Method B. Method A is preferred because it
is more accurate.
Method A (Using bore gauge and micrometer)
Main bearing
NCEM0026S0801
1.
Set main bearings in their proper positions on cylinder block
and main bearing cap.
2.
Install main bearing cap to cylinder block.
Tighten all bolts in correct order in two or three stages. Refer
to EM-52.
3.
Measure inner diameter “A” of each main bearing.
4.
Measure outer diameter “Dm” of each main journal in crank-
shaft.
5.
Calculate main bearing clearance.
Main bearing clearance = A − Dm
Standard: 0.020 - 0.044 mm (0.0008 - 0.0017 in)
Limit: 0.1 mm (0.004 in)
If it exceeds the limit, replace bearing.
If clearance cannot be adjusted within standard of any bearing,
grind crankshaft journal and use undersized bearing.
SEM316A
Taper:
Out-of-round:
SEM346D
SEM366E
Oil hole
Oil groove
Front
AEM153
Bore gauge
.
AEM026
CYLINDER BLOCK
QG
Inspection (Cont’d)
EM-57
When grinding crank pin and crank journal:
I
Grind until clearance is within specified standard bearing
clearance.
I
Fillets should be finished as shown in the figure. R: 2.3 -
2.5 mm (0.091 - 0.098 in)
Refer to SDS, EM-187 for standard bearing clearance and
available spare parts.
6.
If the crankshaft is replaced, select thickness of main bearings
as follows:
a.
Grade number of each cylinder block main journal is punched
on the respective cylinder block. These numbers are punched
in either Arabic or Roman numerals.
b.
Grade number of each crankshaft main journal is punched on
the respective crankshaft. These numbers are punched in
either Arabic or Roman numerals.
c.
Select main bearing with suitable thickness according to the
following table.
Main bearing grade color:
Crankshaft main jour-
nal grade number
Cylinder block main journal grade number
0
1
2
0
Black
Red
Green
1
Red
Green
Yellow
2
Green
Yellow
Blue
For example:
Cylinder block main journal grade number: 1
Crankshaft main journal grade number: 2
Main bearing grade number = 1 + 2 = Yellow
Connecting rod bearing (Big end)
NCEM0026S0802
1.
Install connecting rod bearing to connecting rod and cap.
2.
Install connecting rod cap to connecting rod.
Tighten bolts to the specified torque.
3.
Measure inner diameter “C” of each bearing.
SEM588A
Main journal and pin journal
SEM930F
Front
Main journal
grade number
(0, 1, 2)
Cylinder block
No.1
No.3
No.5
No.2
No.4
AEM172
Crankshaft journal
grade number
No. 1
No. 5
SEM194C
Oil hole
Oil groove
Identification colour
Front
AEM027
Inside micrometer
CYLINDER BLOCK
QG
Inspection (Cont’d)
EM-58
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