Nissan Xterra. Manual — part 375
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HOW TO SELECT PISTON AND BEARING
Main Bearing Selection Table
Main Bearing Grade Table (All Journals)
WBIA0625E
Grade number
Thickness
Unit: mm (in)
Width
Unit: mm (in)
Identification color
Remarks
HOW TO SELECT PISTON AND BEARING
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Undersize Bearing Usage Guide
• When the specified main bearing oil clearance is not obtained with standard size main bearings, use under-
side (US) bearing.
• When using undersize (US) bearing, measure the main bearing inner diameter with bearing installed, and
grind main journal so that the main bearing oil clearance satisfies the standard.
CAUTION:
In grinding crankshaft main journal to use undersize bearings,
keep the fillet R [1.5 - 1.7 mm (0.059 - 0.067 in)].
Bearing undersize table
Unit: mm (in)
0
2.500 - 2.503 (0.0984 - 0.0985)
19.9 - 20.1
(0.783 - 0.791)
Black
Grade is the same for
upper and lower bear-
ings.
1
2.503 - 2.506 (0.0985 - 0.0987)
Brown
2
2.506 - 2.509 (0.0987 - 0.0988)
Green
3
2.509 - 2.512 (0.0988 - 0.0989)
Yellow
4
2.512 - 2.515 (0.0989 - 0.0990)
Blue
5
2.515 - 2.518 (0.0990 - 0.0991)
Pink
6
2.518 - 2.521 (0.0991 - 0.0993)
Purple
7
2.521 - 2.524 (0.0993 - 0.0994)
White
01
UPR
2.503 - 2.506 (0.0985 - 0.0987)
Brown
Grade is different for
upper and lower bear-
ings.
LWR
2.500 - 2.503 (0.0984 - 0.0985)
Black
12
UPR
2.506 - 2.509 (0.0987 - 0.0988)
Green
LWR
2.503 - 2.506 (0.0985 - 0.0987)
Brown
23
UPR
2.509 - 2.512 (0.0988 - 0.0989)
Yellow
LWR
2.506 - 2.509 (0.0987 - 0.0988)
Green
34
UPR
2.512 - 2.515 (0.0989 - 0.0990)
Blue
LWR
2.509 - 2.512 (0.0988 - 0.0989)
Yellow
45
UPR
2.515 - 2.518 (0.0990 - 0.0991)
Pink
LWR
2.512 - 2.515 (0.0989 - 0.0990)
Blue
56
UPR
2.518 - 2.521 (0.0991 - 0.0993)
Purple
LWR
2.515 - 2.518 (0.0990 - 0.0991)
Pink
67
UPR
2.521 - 2.524 (0.0993 - 0.0994)
White
LWR
2.518 - 2.521 (0.0991 - 0.0993)
Purple
PBIC1908E
Size
Thickness
US 0.25 (0.0098)
2.633 - 2.641 (0.1037 - 0.1040)
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SERVICE DATA AND SPECIFICATIONS (SDS)
SERVICE DATA AND SPECIFICATIONS (SDS)
SERVICE DATA AND SPECIFICATIONS (SDS)
Standard and Limit
INFOID:0000000009484496
GENERAL SPECIFICATIONS
DRIVE BELT
INTAKE MANIFOLD COLLECTOR, INTAKE MANIFOLD AND EXHAUST MANIFOLD
Cylinder arrangement
V-6
Displacement cm
3
(cu in)
3,954 (241.30)
Bore and stroke mm (in)
95.5
× 92.0 (3.76 × 3.622)
Valve arrangement
DOHC
Firing order
1-2-3-4-5-6
Number of piston rings
Compression
2
Oil
1
Number of main bearings
4
Compression ratio
9.7
Compression pressure
kPa (kg/cm
2
, psi)/300 rpm
Standard
1,275 (13.0, 185)
Minimum
981 (10.0, 142)
Differential limit between cylinders
98 (1.0, 14)
Cylinder number
Valve timing
(Intake valve timing control - “OFF”)
Unit: degree
a
b
c
d
e
f
244
240
−4
64
6
58
SEM713A
PBIC0187E
Tension of drive belts
Auto adjustment by auto-tensioner
SERVICE DATA AND SPECIFICATIONS (SDS)
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Unit: mm (in)
SPARK PLUG
*: Always check with the Parts Department for the latest parts information.
CAMSHAFT AND CAMSHAFT BEARING
Unit: mm (in)
*
1
: Total indicator reading
Valve Seal
Unit: mm (in)
Valve Lifter
Unit: mm (in)
Items
Limit
Surface distortion
Intake manifold collector
0.1 (0.004)
Intake manifold
0.1 (0.004)
Exhaust manifold
0.3 (0.012)
Make
NGK
Standard type*
DILFR5A-11
Gap (nominal)
1.1 mm (0.043 in)
Items
Standard
Limit
Camshaft journal oil clearance
No. 1
0.045 - 0.086 (0.0018 - 0.0034)
0.15 (0.0059)
No. 2, 3, 4
0.035 - 0.076 (0.0014 - 0.0030)
Camshaft journal length
No. 1
27.500 - 27.548 (1.0827 - 1.0846)
—
Camshaft bracket inner diameter
No. 1
26.000 - 26.021 (1.0236 - 1.0244)
—
No. 2, 3, 4
23.500 - 23.521 (0.9252 - 0.9260)
—
Camshaft journal diameter
No. 1
25.935 - 25.955 (1.0211 - 1.0218)
—
No. 2, 3, 4
23.445 - 23.465 (0.9230 - 0.9238)
—
Camshaft end play
0.115 - 0.188 (0.0045 - 0.0074)
0.24 (0.0094)
Camshaft cam height (A)
Intake
45.465 - 45.655 (1.7900 - 1.7974)
45.265 (1.7821)
Exhaust
45.075 - 45.265 (1.7746 - 1.7821)
44.875 (1.7667)
Camshaft runout [TIR*
1
]
Less than 0.02 (0.0008)
0.05 (0.002)
Camshaft sprocket runout [TIR*
2
]
—
0.15 (0.0059)
SEM671
Items
Standard
Valve seal installed height (H)
14.3 - 14.9 (0.563 - 0.587)
Items
Standard
Valve lifter outer diameter
33.977 - 33.987 (1.3377 - 1.3381)
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