Nissan Altima L32. Instruction — part 637
EM-84
< DISASSEMBLY AND ASSEMBLY >
[QR25DE]
CYLINDER BLOCK
• Using a dial gauge, measure the clearance between the thrust
bearings and the crankshaft arm when the crankshaft is moved
fully forward or backward.
• If the measured value exceeds the limit, replace the thrust bear-
ings, and measure again. If it still exceeds the limit, replace the
crankshaft.
CONNECTING ROD SIDE CLEARANCE
• Measure side clearance between connecting rod and crankshaft
arm using a feeler gauge.
• If the measured value exceeds the limit, replace the connecting
rod bearings, and measure again. If it still exceeds the limit,
replace the crankshaft also.
PISTON AND PISTON PIN CLEARANCE
Diameter of Piston Pin Bore
• Measure the diameter of piston pin bore using an inside microme-
ter. Refer to
.
Outer Diameter of Piston Pin
• Measure outer diameter of piston pin using a micrometer. Refer to
Piston to Piston Pin Clearance
Standard
: 0.10 - 0.26 mm (0.0039 - 0.0102 in)
Limit
: 0.30 mm (0.0118 in)
PBIC0268E
Standard
: 0.20 - 0.35 mm (0.0079 - 0.0138 in)
Limit
: 0.50 mm (0.0197 in)
KBIA0071E
PBIC0116E
PBIC0117E
CYLINDER BLOCK
EM-85
< DISASSEMBLY AND ASSEMBLY >
[QR25DE]
C
D
E
F
G
H
I
J
K
L
M
A
EM
N
P
O
(Piston pin clearance) = (Piston pin bore diameter) – (Outer diameter
of piston pin)
• A: Front mark
• B: Piston pin bore grade
• C: Piston grade I.D. stamp
• D: Piston crown I.D. code stamp
• If clearance exceeds specification, replace either or both of piston/
piston pin assembly and connecting rod assembly with reference
to specification of each parts.
• Use the piston selection table to replace piston/piston pin assem-
bly. Refer to
EM-93, "How to Select Piston and Bearing"
• Use the connecting rod bearing selection table to replace connecting rod. Refer to
.
NOTE:
• The connecting rod small end grade and piston pin hole (piston
pin) grade are provided only for the parts installed at the plant. For
service parts, no grades can be selected. Only 0 grade is avail-
able.
• Follow the "CONNECTING ROD BUSHING OIL CLEARANCE
(SMALL END)" procedure for the values for each grade at the
plant.
PISTON RING SIDE CLEARANCE
• Measure side clearance of piston ring and piston ring groove using
.
• If out of specification, replace piston and/or piston ring assembly.
PISTON RING END GAP
• Check if inner diameter of cylinder bore is within specification.
Follow the "PISTON TO CYLINDER BORE CLEARANCE" proce-
dure.
• Insert piston ring until middle of cylinder with piston, and measure
gap using a feeler gauge. Refer to
• If out of specification, replace piston ring.
CONNECTING ROD BEND AND TORSION
Standard
: 0.002 - 0.006 mm (0.0001 - 0.0002 in)
ALBIA0209ZZ
SBIA0282E
SEM024AA
SEM822B
EM-86
< DISASSEMBLY AND ASSEMBLY >
[QR25DE]
CYLINDER BLOCK
• Check with connecting rod aligner. Refer to
• If it exceeds the limit, replace connecting rod assembly.
CONNECTING ROD BEARING (BIG END)
• Install the connecting rod cap without the connecting rod bearing
installed. After tightening the connecting rod bolt to the specified
torque, measure the connecting rod big end inner diameter using
an inside micrometer. Refer to
CONNECTING ROD BUSHING OIL CLEARANCE (SMALL END)
Inner Diameter of Connecting Rod (Small End)
• Measure inner diameter of bushing. Refer to
Outer Diameter of Piston Pin
SEM003F
SEM038F
PBIC0119E
PBIC0120E
CYLINDER BLOCK
EM-87
< DISASSEMBLY AND ASSEMBLY >
[QR25DE]
C
D
E
F
G
H
I
J
K
L
M
A
EM
N
P
O
• Measure outer diameter of piston pin. Refer to
.
Piston Pin to Connecting Rod Bushing Clearance (Small End)
(Piston pin to connecting rod bushing clearance (small end)) = (Inner
diameter of connecting 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 "Piston
Selection Table" to select the piston corresponding to the applica-
ble bore grade of the cylinder block to be used. Refer to
"How to Select Piston and Bearing"
Factory Installed Parts Grading:
• Service parts apply only to grade 0 (B).
Unit: mm (in)
• A: Front mark
• C: Piston grade I.D. stamp
• D: Piston crown I.D. code stamp
CYLINDER BLOCK DISTORTION
• Using a scraper, remove gasket on the cylinder block surface, and also remove oil, scale, carbon, or other
contamination.
CAUTION:
Be careful not to allow gasket debris to enter the oil or coolant passages.
• Measure the distortion on the block upper face at some different
points in 6 directions.
• If out of the distortion limit, replace the cylinder block and lower
block they are machined together as an assembly.
INNER DIAMETER OF MAIN BEARING HOUSING
PBIC0117E
Standard
: 0.005 - 0.017 mm (0.0002 - 0.0007 in)
SBIA0282E
Piston Pin Grade (B)
0
1
Connecting rod small end
inner bushing diameter
20.000 - 20.006
(0.7874 - 0.7876)
20.006 - 20.012
(0.7876 - 0.7879)
Piston pin outer diameter
19.989 - 19.995
(0.7870 - 0.7872)
19.995 - 20. 001
(0.7872 - 0.7874)
Piston pin bore diameter
19.993 - 19.999
(0.7871- 0.7874)
19.999 - 20.005
(0.7874 - 0.7876)
ALBIA0209ZZ
Limit
: 0.1 mm (0.004 in)
PBIC0121E
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст