Infiniti F50. Manual — part 552
CYLINDER BLOCK
EM-95
C
D
E
F
G
H
I
J
K
L
M
A
EM
Method of Using Plastigauge
●
Remove oil and dust on the crankshaft pin and the surfaces of
each bearing completely.
●
Cut a plastigage slightly shorter than the bearing width, and
place it in crankshaft axial direction, avoiding oil holes.
●
Install the connecting rod bearings to the connecting rod and the
connecting rod bearing cap, and tighten the connecting rod nut
to the specified torque.
CAUTION:
Never rotate the crankshaft.
●
Remove the connecting rod cap and bearings, and using the
scale on the plastigage bag, measure the plastigage width.
NOTE:
The procedure when the measured value exceeds the repair limit is same as that described in “Method of
Measurement”.
OIL CLEARANCE OF MAIN BEARING
Method of Measurement
●
Install the main bearings to the cylinder block and main bearing cap. Measure the main bearing inner
diameter with the bearing cap bolt tightened to the specified torque. Refer to
.
(Oil clearance) = (Inner diameter of main bearing) – (Outer diameter of crankshaft journal)
●
If the measured value exceeds the repair limit, select main bearings referring to the main bearing inner
diameter and crankshaft journal outer diameter, so that the oil clearance satisfies the standard. Refer to
EM-84, "HOW TO SELECT MAIN BEARING"
.
Method of Using Plastigage
●
Remove oil and dust on the crankshaft journal and the surfaces
of each bearing completely.
●
Cut a plastigage slightly shorter than the bearing width, and
place it in crankshaft axial direction, avoiding oil holes
●
Install the main bearings to the cylinder block and main bearing
cap, and tighten the main bearing bolts to the specified torque.
CAUTION:
Never rotate the crankshaft.
●
Remove the bearing cap and bearings, and using the scale on
the plastigage bag, measure the plastigage width.
NOTE:
The procedure when the measured value exceeds the repair limit is same as that described in “Method of
Measurement”.
SBIA0409E
Standard:
No. 1 and 5 journals
: 0.001 - 0.011 mm (0.0004 - 0.0004 in)
No. 2, 3, and 4 journals
: 0.007 - 0.017 mm (0.0003 - 0.0007 in)
Limit:
No.1 and 5 journals
: 0.021 mm (0.0008 in)
No. 2, 3, and 4 journals
: 0.027 mm (0.0011 in)
SBIA0410E
EM-96
CYLINDER BLOCK
CRUSH HEIGHT OF MAIN BEARING
●
When the bearing cap is removed after being tightened to the
specified torque with main bearings installed, the tip end of bear-
ing must protrude.
●
If the standard is not met, replace main bearings.
Standard
: There must be crush height
SEM502G
SERVICE DATA AND SPECIFICATIONS (SDS)
EM-97
C
D
E
F
G
H
I
J
K
L
M
A
EM
SERVICE DATA AND SPECIFICATIONS (SDS)
PFP:00030
Standard and Limit
EBS003P5
GENERAL SPECIFICATIONS
DRIVE BELTS
INTAKE MANIFOLD AND EXHAUST MANIFOLD
Unit: mm (in)
Cylinder arrangement
V-8
Displacement
cm
3
(cu in)
4,494 (274.22)
Bore and stroke
mm (in)
93 x 82.7 (3.66 x 3.256)
Valve arrangement
DOHC
Firing order
1-8-7-3-6-5-4-2
Number of piston rings
Compression
2
engine oil
1
Number of main bearings
5
Compression ratio
10.5
Compression pressure
kPa (kg/cm
2
, psi)/300 rpm
Standard
1,320 (13.5, 191)
Minimum
1,130 (11.5, 164)
Differential limit
between cylinders
98 (1.0, 14)
Cylinder number
Valve timing
Unit: degree
a
b
c
d
e
f
228
240
0
60
0
48
SEM957C
PBIC0187E
Tension of drive belts
Auto adjustment by auto tensioner
Item
Limit
Surface distortion
Intake manifold upper
0.1 (0.004)
Intake manifold lower
0.1 (0.004)
Exhaust manifold
0.3 (0.012)
EM-98
SERVICE DATA AND SPECIFICATIONS (SDS)
SPARK PLUG (PLATINUM-TIPPED TYPE)
CYLINDER HEAD
Unit: mm (in)
VALVE
Valve Dimensions
Unit: mm (in)
Make
NGK
Type
Standard
PLFR5A-11
Hot
PLFR4A-11
Cold
PLFR6A-11
Plug gap (Nominal)
1.1 mm (0.043 in)
Items
Limit
Head surface distortion
0.1 (0.004)
PBIC0183E
Valve head diameter “D”
Intake
36.0 - 36.3 (1.417 - 1.429)
Exhaust
31.2 - 31.5 (1.228 - 1.240)
Valve length “L”
Intake
96.57 (3.8020)
Exhaust
94.50 (3.720)
Valve stem diameter “d”
Intake
5.972 - 5.980 (0.2351 - 0.2354)
Exhaust
5.962 - 5.970 (0.2347 - 0.2350)
Valve seat angle “
α
”
Intake
45
°
15
′
- 45
°
45
′
Exhaust
Valve margin “T”
Intake
0.95 - 1.25 (0.0374 - 0.0492)
Exhaust
1.15 - 1.45 (0.0453 - 0.0571)
SEM188
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