Nissan Terrano model r20 series 2004. Manual — part 41
3) Using rod with outer diameter of 30 mm (1.18 in), press piston
pins out.
11. Remove lower cylinder block.
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The lower cylinder block is the lower part of the cylinder block,
which works as the main bearing cap (beam) and oil pan
mounting face.
1) Remove mounting bolts for engine sub-attachment shown by
arrows in the figure.
2) Loosen and remove mounting bolts in the reverse order shown
in the figure.
3) Insert flat-bladed screwdriver into 5 locations shown by arrows
in the figure. Lift lower cylinder block evenly, and remove liquid
gasket.
CAUTION:
Prevent mating faces from being damaged.
4) When removing lower cylinder block, use slot to prevent dowel
pin from interfering with engine sub-attachment.
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No part No. is given to lower cylinder block, because it is
machined with the cylinder block.
12. Remove crankshaft.
13. Remove main bearings and thrust bearings from cylinder block
and lower cylinder block.
CAUTION:
Check mounting positions. Keep them to avoid confusion.
FEM090
FEM091
FEM092
FEM093
CYLINDER BLOCK
ZD
Disassembly (Cont’d)
EM-70
Inspection
CRANKSHAFT END PLAY
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Using dial indicator, measure crankshaft travel amount by mov-
ing the crankshaft forward or backward, or
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Using feeler gauge, measure crankshaft travel amount with the
lower cylinder block removed.
Standard: 0.055 - 0.140 mm (0.0022 - 0.0055 in)
Limit: 0.250 mm (0.0098 in)
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If measured value exceeds the limit, select appropriate thrust
bearings.
Unit: mm (in)
Grade symbol
Thickness of thrust bearing
A
2.275 - 2.325 (0.0896 - 0.0915)
B
2.300 - 2.350 (0.0906 - 0.0925)
C
2.325 - 2.375 (0.0915 - 0.0935)
OS 020
2.475 - 2.525 (0.0974 - 0.0994)
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OS 020 has part No. of 12280 2W215 and OS 0.20 marked on
bearing surface.
CONNECTING ROD SIDE CLEARANCE
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Using feeler gauge, measure side clearance between connect-
ing rod and crank arm.
Standard: 0.10 - 0.22 (0.0039 - 0.0087 in)
Limit: 0.22 mm (0.0087 in)
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If measured value exceeds the limit, replace connecting rod
and repeat measurement.
If measured value still exceeds the limit, replace crankshaft.
PISTON TO PISTON PIN CLEARANCE
Piston pin hole inner diameter
Using inside micrometer, measure piston pin hole inner diameter.
Standard: 32.997 - 33.005 mm (1.2991 - 1.2994 in) dia.
Piston pin outer diameter
Using micrometer, measure piston pin outer diameter.
Standard: 32.993 - 33.000 mm (1.2989 - 1.2992 in) dia.
FEM094
FEM095
FEM096
FEM097
FEM098
CYLINDER BLOCK
ZD
EM-71
Calculation of piston to piston pin clearance
Piston pin clearance = Piston pin hole inner diameter − Piston pin
outer diameter
Standard: −0.003 (Tightening clearance) to 0.012 mm
(−0.0001 to 0.0005 in)
If out of specifications, replace piston and piston pin assembly.
PISTON RING SIDE CLEARANCE
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Using feeler gauge, measure clearance between piston ring
and piston ring groove.
Unit: mm (in)
Standard
Limit
Top ring
0.05 - 0.07 (0.0020 - 0.0028)
0.5 (0.020)
Second ring
0.04 - 0.08 (0.0016 - 0.0031)
0.3 (0.012)
Oil ring
0.02 - 0.06 (0.0008 - 0.0024)
0.15 (0.0059)
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Align top ring and external surface of piston. Measure lower
side clearance of top ring with top ring pressed onto upper side
of ring groove.
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If side clearance exceeds the limit, replace piston ring.
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Check clearance again. If side clearance still exceeds the limit,
replace piston.
PISTON RING END GAP
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Check that cylinder bore diameter is within specifications.
Refer to EM-74, “PISTON TO CYLINDER BORE CLEAR-
ANCE”.
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Using piston, press piston ring to cylinder mid point, and mea-
sure end gap.
Unit: mm (in)
Standard
Limit
Top ring
0.25 - 0.45 (0.0098 - 0.0177)
1.5 (0.059)
Second ring
0.50 - 0.65 (0.0197 - 0.0256)
Oil ring
0.25 - 0.50 (0.0098 - 0.0197)
FEM099
FEM100
FEM101
CYLINDER BLOCK
ZD
Inspection (Cont’d)
EM-72
CONNECTING ROD BEND AND TORSION
Use connecting rod aligner to check bend and torsion.
Bend limit:
0.05 mm (0.0020 in)/100 mm (3.94 in)
Torsion limit:
0.05 mm (0.0020 in)/100 mm (3.94 in)
Connecting rod big end inner diameter
Install connecting rod caps without connecting rod bearings and
tighten connecting rod nuts to the specified torque. Using inside
micrometer, measure connecting rod big end inner diameter.
Standard:
59.987 - 60.000 mm (2.3617 - 2.3622 in) dia.
CONNECTING ROD BUSHING OIL CLEARANCE (SMALL
END)
Connecting rod small end inner diameter
Use inside micrometer to measure small end inner diameter.
Standard:
33.025 - 33.038 mm (1.3002 - 1.3007 in) dia.
Piston pin outer diameter
Use micrometer to measure piston pin outer diameter.
Standard:
32.993 - 33.000 mm (1.2989 - 1.2992 in) dia.
Calculation of connecting rod bushing clearance
Connecting rod small end bushing clearance = Connecting rod
small end inner diameter − Piston pin outer diameter
Standard:
0.025 - 0.045 mm (0.0010 - 0.0018 in)
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If out of specifications, replace connecting rod and/or piston
and piston pin assembly.
FEM102
FEM103
FEM104
FEM098
CYLINDER BLOCK
ZD
Inspection (Cont’d)
EM-73
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