Nissan Terrano r20e. Manual — part 295
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
0.3 - 0.45 (0.0118 - 0.0177)
1.5 (0.059)
Second ring
0.5 - 0.65 (0.0197 - 0.0256)
Oil ring
0.25 - 0.45 (0.0098 - 0.0177)
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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New connecting rods are classified into 8 weight classes at
factory. The same class connecting rods are used on a engine.
Weight grade symbol
Weight class g (oz)
H
1,261 - 1,264 (44.5 - 44.6)
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1,264 - 1,267 (44.6 - 44.7)
K
1,267 - 1,270 (44.7 - 44.8)
L
1,270 - 1,273 (44.8 - 44.9)
M
1,273 - 1,276 (44.9 - 45.0)
O
1,276 - 1,279 (45.0 - 45.1)
P
1,279 - 1,282 (45.1 - 45.2)
S
1,282 - 1,285 (45.2 - 45.3)
CYLINDER BLOCK TOP SURFACE DISTORTION
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Using scraper, remove gasket installed onto cylinder block sur-
face. Remove contamination such as oil, scale, and carbon.
CAUTION:
Keep broken pieces of gasket clear of oil and coolant pas-
sages.
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Use straightedge and feeler gauge to check block upper sur-
face for distortion.
Limit: 0.1 mm (0.004 in)
MAIN BEARING HOUSING INNER DIAMETER
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Install main bearing caps without main bearings. Tighten
mounting bolts to the specified torque.
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Use bore gauge to measure main bearing housing inner diam-
eter.
Standard:
74.981 - 75.000 mm (2.9520 - 2.9528 in) dia.
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If out of specification, replace cylinder block and lower cylinder
block.
PISTON TO CYLINDER BORE CLEARANCE
Cylinder bore inner diameter
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Using bore gauge, measure cylinder inner diameters at 6 posi-
tions; top, middle, and bottom (A, B, C) in 2 directions (X, Y).
Cylinder inner diameter (Standard):
96.000 - 96.030 mm (3.7795 - 3.7807 in) dia.
Wear limit: 0.2 mm (0.008 in)
Out-of-round limit (X - Y): 0.02 mm (0.0008 in)
Taper limit (A - C): 0.02 mm (0.0008 in)
FEM106
FEM107
FEM108
FEM109
CYLINDER BLOCK
ZD
Inspection (Cont’d)
EM-74
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