Infiniti FX35, FX50 (S51). Manual — part 957
EM-128
< UNIT DISASSEMBLY AND ASSEMBLY >
[VQ35HR]
CYLINDER BLOCK
• Measure the side clearance of piston ring (1) and piston ring
groove with a feeler gauge (C).
• If the measured value exceeds the limit, replace piston ring, and
measure again. If it still exceeds the limit, replace piston also.
PISTON RING END GAP
• Check that the cylinder bore inner diameter is within the specification. Refer to
• Lubricate with new engine oil to piston (1) and piston ring (2), and
then insert piston ring until middle of cylinder with piston, and mea-
sure the piston ring end gap with a feeler gauge (B).
• If the measured value exceeds the limit, replace piston ring, and
measure again. If it still exceeds the limit, rebore cylinder and use
oversize piston and piston rings.
CONNECTING ROD BEND AND TORSION
• Check with a connecting rod aligner.
• If it exceeds the limit, replace connecting rod assembly.
CONNECTING ROD BIG END DIAMETER
A
: OK
B
: NG
Standard and limit
: Refer to
.
JPBIA0219ZZ
A
: Press-fit
C
: Measuring point
Standard and limit
: Refer to
JPBIA0220ZZ
A
: Bend
B
: Torsion
C
: Feeler gauge
Bend limit
: Refer to
Torsion limit
JPBIA0221ZZ
CYLINDER BLOCK
EM-129
< UNIT DISASSEMBLY AND ASSEMBLY >
[VQ35HR]
C
D
E
F
G
H
I
J
K
L
M
A
EM
N
P
O
• Install connecting rod bearing cap without installing connecting rod
bearing, and tightening connecting rod bolts to the specified
torque. Refer to
EM-118, "Disassembly and Assembly"
for the
tightening procedure.
• Measure the inner diameter of connecting rod big end with an
inside micrometer.
• If out of the standard, replace connecting rod assembly.
CONNECTING ROD BUSHING OIL CLEARANCE
Connecting Rod Bushing Inner Diameter
Measure the inner diameter of connecting rod bushing with an inside
micrometer (A).
Piston Pin Outer Diameter
Measure the outer diameter of piston pin with a micrometer (A).
Connecting Rod Bushing Oil Clearance
(Connecting rod bushing oil clearance) = (Connecting rod bushing inner diameter) – (Piston pin outer diame-
ter)
• If the calculated value exceeds the limit, replace connecting rod assembly and/or piston and piston pin
assembly.
• If replacing piston and piston pin assembly, refer to
• If replacing connecting rod assembly, refer to
to select the connecting rod bearing.
1
: Connecting rod
Standard
: Refer to
JPBIA0222ZZ
Standard
: Refer to
JPBIA0223ZZ
Standard
: Refer to
JPBIA0218ZZ
Standard and limit
: Refer to
A
: Sample codes
B
: Bearing stopper groove
C
: Small-end diameter grade
D
: Big-end diameter grade
E
: Weight grade
F
: Cylinder No.
G
: Management code
JPBIA0208ZZ
EM-130
< UNIT DISASSEMBLY AND ASSEMBLY >
[VQ35HR]
CYLINDER BLOCK
Factory installed parts grading:
• Service parts apply only to grade “0”.
Unit: mm (in)
*: After installing in connecting rod
CYLINDER BLOCK DISTORTION
• Using a scraper, remove gasket on the cylinder block surface, and also remove engine oil, scale, carbon, or
other contamination.
CAUTION:
Be careful not to allow gasket flakes to enter engine oil or engine coolant passages.
• Measure the distortion on the cylinder block upper face at some
different points in six directions (C, D, E, F, G, and H) with a
straightedge (A) and a feeler gauge (B).
• If it exceeds the limit, replace cylinder block.
MAIN BEARING HOUSING INNER DIAMETER
• Install lower cylinder block (2) without installing main bearings, and
tighten lower cylinder block bolts to the specified torque. Refer to
EM-118, "Disassembly and Assembly"
for the tightening proce-
dure.
• Measure the inner diameter of main bearing housing with a bore
gauge.
• If out of the standard, replace cylinder block (1) and lower cylinder
block as assembly.
NOTE:
Cylinder block cannot be replaced as a single part, because it is
machined together with lower cylinder block.
PISTON TO CYLINDER BORE CLEARANCE
Cylinder Bore inner Diameter
H
: Front mark
I
: Management code
A
: Piston grade number
B
: Front mark
C
: Piston pin grade number
Grade
0
1
Connecting rod bushing
inner diameter *
22.000 - 22.006
(0.8661 - 0.8664)
22.006 - 22.012
(0.8664 - 0.8666)
Piston pin hole diameter
21.993 - 21.999
(0.8659 - 0.8661)
21.999 - 22. 005
(0.8661 - 0.8663)
Piston pin outer diameter
21.989 - 21.995
(0.8657 - 0.8659)
21.995 - 22.001
(0.8659 - 0.8662)
JPBIA0267ZZ
Limit
: Refer to
JPBIA0224ZZ
Standard
: Refer to
JPBIA0225ZZ
CYLINDER BLOCK
EM-131
< UNIT DISASSEMBLY AND ASSEMBLY >
[VQ35HR]
C
D
E
F
G
H
I
J
K
L
M
A
EM
N
P
O
• Using a bore gauge, measure cylinder bore for wear, out-of-round
and taper at six different points on each cylinder. [(A) and (B) direc-
tions at (C), (D) and (E)] is in longitudinal direction of engine.
• If the measured value exceeds the limit, or if there are scratches
and/or seizure on the cylinder inner wall, hone or rebore the inner
wall.
• Oversize piston is provided. When using oversize piston, rebore
cylinder so that the clearance of the piston to cylinder bore satis-
fies the standard.
CAUTION:
When using oversize piston, use oversize pistons for all cylin-
ders with oversize piston rings.
Piston Skirt Diameter
Measure the outer diameter of piston skirt with a micrometer (A).
Piston-to-Cylinder Bore Clearance
Calculate by piston skirt diameter and cylinder bore inner diameter [direction (B), position (D)].
(Clearance) = (Cylinder bore inner diameter) – (Piston skirt diameter).
• If the calculated value exceeds the limit, replace piston and piston pin assembly. Refer to
Re-boring Cylinder Bore
1.
Cylinder bore size is determined by adding piston to cylinder bore clearance to piston skirt diameter.
2.
Install lower cylinder block, and tighten to the specified torque. Otherwise, cylinder bores may be distorted
in final assembly.
3.
Cut cylinder bores.
NOTE:
f
: 10 mm (0.39 in)
g
: 60 mm (2.36 in)
h
: 125 mm (4.92 in)
Standard and limit
: Refer to
JPBIA0226ZZ
Oversize (O/S)
: 0.2 mm (0.008 in)
SEM843E
Measure point
: Refer to
.
Standard
JPBIA0227ZZ
Standard and limit
: Refer to
.
Re-bored size calculation: D = A + B – C
where,
A: Piston skirt diameter as measured
B: Piston to cylinder bore clearance (standard value)
C: Honing allowance 0.02 mm (0.0008 in)
D: Bored diameter
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