Nissan Maxima. Instruction — part 558
EM-120
< UNIT DISASSEMBLY AND ASSEMBLY >
CYLINDER BLOCK
• Install the connecting rod cap without the connecting rod bearing
installed. After tightening the connecting rod nut to the specified
torque, measure the connecting rod bearing housing big end inner
diameter using an inside micrometer.
CONNECTING ROD BUSHING OIL CLEARANCE (SMALL END)
Inner Diameter of Connecting Rod (Small End)
• Measure inner diameter of piston pin bushing.
Outer Diameter of Piston Pin
• Measure outer diameter of piston pin.
Connecting Rod Bushing Oil Clearance (Small End)
(Connecting rod small end oil clearance) = (Inner diameter of con-
necting rod small end) – (Outer diameter of piston pin)
• If the measured value exceeds the standard, replace the connect-
ing rod assembly and/or piston and piston pin assembly.
• If replacing the piston and piston pin assembly, use the Table for
Selective Fitting for Piston to select the piston corresponding to the
applicable bore grade of the cylinder block to be used. Follow the
"PISTON-TO-CYLINDER BORE CLEARANCE" procedure.
Factory installed parts grading:
Standard
: 55.000 - 55.013 mm (2.1654 - 2.1659 in)
PBIC0119E
Standard
Grade No. 0
: 22.000 - 22.006 mm (0.8661 - 0.8664 in)
Grade No. 1
: 22.006 - 22.012 mm (0.8664 - 0.8666 in)
PBIC0120E
Standard
Grade No. 0
: 21.989 - 21.995 mm (0.8657 - 0.8659 in)
Grade No. 1
: 21.995 - 22.001 mm (0.8659 -0.8662 in)
PBIC0117E
Standard
: 0.005 - 0.017 mm (0.0002 - 0.0007 in)
Limit
: 0.030 mm (0.0012 in)
SEM457G
CYLINDER BLOCK
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•
: Engine front
• Piston Grade No. (A)
• Piston front mark (B)
• Oil hole (C)
• Connecting rod front mark (D)
• Cylinder No. (E)
• Pin Grade No. (F)
• Crown I.D. code (G)
Service parts apply only to grade 0.
Unit: mm (in)
CYLINDER BLOCK DISTORTION
• Using a scraper, remove any old gasket material on the cylinder
block surface, and remove any oil, scale, carbon, or other contami-
nation.
CAUTION:
Be careful not to allow gasket flakes to enter the oil or coolant
passages.
• Measure the distortion on the block upper face at different points in
six directions.
• If out of specification, resurface the cylinder block. The allowable
amount of resurfacing is dependent on the amount of any cylinder
head resurfacing. The resurfacing limit is [amount of cylinder head resurfacing] + [amount of cylinder head
resurfacing] = 0.2 mm (0.008 in).
INNER DIAMETER OF MAIN BEARING HOUSING
• Install the main bearing caps with the main bearings removed, and tighten the bolts to the specified torque.
• Using a bore gauge, measure the inner diameter of the main bear-
ing housing "A".
• If out of the standard, replace the cylinder block and main bearing
caps as an assembly.
NOTE:
These components cannot be replaced as a single unit, because
they were processed together.
PISTON-TO-CYLINDER BORE CLEARANCE
1. Using a bore gauge, measure cylinder bore for wear, out-of-round and taper at (A), (B) and (C). The X axis
is in the longitudinal direction of the engine.
AWBIA1399ZZ
Grade
0
1
Connecting rod small end inner diameter
22.000 - 22.006
(0.8661 - 0.8664)
22.006 - 22.012
(0.8664 - 0.8666)
Piston pin outer diameter
21.989 - 21.995
(0.8657 - 0.8659)
21.995 - 22. 001
(0.8659 - 0.8662)
Piston pin hole diameter
21.993 - 21.999
(0.8659 - 0.8661)
21.999 - 22.005
(0.8661 - 0.8663)
Distortion limit
: 0.10 mm (0.0039 in)
Cylinder block height
: 214.95 - 215.05 mm
(8.4626 - 8.4665 in)
SEM123C
Standard
: 63.993 - 64.017 mm (2.5194 - 2.5203 in)
SEM845E
EM-122
< UNIT DISASSEMBLY AND ASSEMBLY >
CYLINDER BLOCK
Cylinder bore inner diameter
If it exceeds the limit, rebore all cylinders. Replace cylinder block
if necessary.
2. Check for scratches and seizure. If seizure is found, hone it.
• If both cylinder block and piston are replaced with new
ones, select piston of the same grade number punched on
cylinder block rear position. These numbers are punched
in either Arabic or Roman numerals.
3. Measure piston skirt diameter.
4. Check that piston-to-bore clearance is within specification.
• The piston-to-bore clearance is measured at the "B" level in
the cylinder as shown.
Grade No.
Standard inner diameter
Wear limit
No. 1
95.500 - 95.510 mm (3.7598 - 3.7602 in)
0.20 mm (0.0079 in)
No. 2
95.510 - 95.520 mm (3.7602 - 3.7606 in)
No. 3
95.520 - 95.530 mm (3.7606 - 3.7610 in)
SEM843E
Out-of-round (Dif-
ference between X
and Y)
: limit 0.015 mm (0.0006 in)
Taper (Difference
between A and C)
: limit 0.010 mm (0.0004 in)
JPBIA2238GB
SEM756G
Piston diameter “A”
: Refer to
.
Measuring point “a”
(Distance from the top)
: 38.0 mm (1.496 in)
SEM258C
Piston-to-bore
clearance at “B”
: 0.010 - 0.030 mm (0.0004 - 0.0012 in)
JPBIA2238GB
CYLINDER BLOCK
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5. Cylinder bore size is determined by adding piston-to-bore clearance to piston diameter “A”.
6. Install main bearing caps, and tighten to the specified torque. Otherwise, cylinder bores may be distorted
after boring.
7. Cut cylinder bores.
• 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.
8. Hone cylinders to obtain specified piston-to-bore clearance.
9. Measure finished cylinder bore for out-of-round and taper.
• Measurement should be done after cylinder bore cools down.
CRANKSHAFT
1. Check the crankshaft main and pin journals for scoring, wear, or
cracks.
2. Measure the journals for taper and out-of-round.
3. Measure crankshaft runout.
a. Place a V-block on a precise flat table to support the journals on
the both ends of the crankshaft.
b. Place a dial gauge straight up on the No. 3 journal.
c. While rotating the crankshaft, read the movement of the pointer
on the dial gauge.
BEARING CLEARANCE
• Use either of the following two methods, however method "A" gives more reliable results and so is the pre-
ferred method.
Method A (Using Bore Gauge and Micrometer)
Main Bearing
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)
Standard
Out-of-round (X - Y) : 0.002 mm (0.0001 in)
Taper (A - B)
: 0.002 mm (0.0001 in)
SEM316A
Runout limit (total indicator
reading)
: 0.10 mm (0.0039 in)
SEM346D
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