Infiniti I35 (A33). Manual — part 480
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SEM709G
TIGHTENING PROCEDURES
NHEM0006S01
Intake Manifold
NHEM0006S0101
I
Loosen in reverse order shown in the figure.
I
Tighten in numerical order shown in the figure.
1.
Tighten all bolts and nuts to 4.9 to 9.8 N·m (0.50 to 0.99 kg-m,
4 to 7 ft-lb).
2.
Finally tighten all bolts and nuts to 26.5 to 31.4 N·m (2.7 to 3.2
kg-m, 20 to 23 ft-lb).
I
Tighten all bolts and nuts to the final torque, evenly dividing the
tightening into at least three steps.
SEM710G
Fuel Tube
NHEM0006S0102
I
Tighten in numerical order shown in the figure.
1.
Tighten all bolts to 9.3 to 10.8 N·m (0.95 to 1.1 kg-m, 6.9 to
7.9 ft-lb).
2.
Then tighten all bolts to 20.6 to 26.5 N·m (2.1 to 2.7 kg-m, 16
to 19 ft-lb).
SEM952F
Fuel Damper
NHEM0006S0103
Tighten fuel damper to 2.9 to 3.8 N·m (0.3 to 0.39 kg-m, 26.0 to
33.9 in-lb).
I
Tighten screws evenly several times to have the fuel
damper tightened at the specified torque.
I
Always replace O-ring with new ones.
I
Lubricate O-ring with new engine oil.
SEM711G
Electronic Control Throttle Actuator
NHEM0006S0105
I
Tighten in numerical order shown in the figure.
Tighten all bolts to 7.2 to 9.6 N·m (0.74 to 0.97 kg-m, 64 to 84 in-
lb).
CAUTION:
I
Perform “Throttle Valve Closed Position Learning” when
harness connector of electronic throttle control actuator
is disconnected.
Refer to “BASIC SERVICE PROCEDURE” in EC section.
I
Perform “Idle Air Volume Learning” when electronic
throttle control actuator is replaced.
Refer to “BASIC SERVICE PROCEDURE” in EC section.
GI
MA
LC
EC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
OUTER COMPONENT PARTS
Removal and Installation (Cont’d)
EM-11
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SEM712G
Intake Manifold Upper Collector
NHEM0006S0108
I
Loosen in reverse order and tighten in numerical order
shown in the figure.
Tighten all bolts to 17.6 to 21.6 N·m (1.8 to 2.2 kg-m, 13 to 15
ft-lb).
SEM713G
Intake Manifold Lower Collector
NHEM0006S0107
I
Loosen in reverse order shown in the figure.
I
Tighten in numerical order shown in the figure.
Tighten bolts and nuts to 17.6 to 21.6 N·m (1.8 to 2.2 kg-m, 13 to
15 ft-lb).
SEM714G
Power Valve
NHEM0006S0109
I
Tighten in numerical order shown in the figure.
Tighten all bolts to 17.6 to 21.6 N·m (1.8 to 2.2 kg-m, 13 to 15
ft-lb).
JEM802G
JEM803G
Exhaust Manifold
NHEM0006S0110
I
Loosen in reverse order shown in the figure.
I
Tighten in numerical order shown in the figure.
Tighten nuts to 28.4 to 33.3 N·m (2.9 to 3.3 kg-m, 21 to 24 ft-lb).
OUTER COMPONENT PARTS
Removal and Installation (Cont’d)
EM-12
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NHEM0007
SEM087G
1.
Warm up engine.
2.
Turn ignition switch OFF.
3.
Release fuel pressure.
Refer to EC-55, “Fuel Pressure Release”.
4.
Disconnect
ignition
coil
with
power
transistor
harness
connectors, then remove ignition coils.
5.
Remove all spark plugs.
6.
Remove fuse for fuel injector.
SEM909E
SEM387C
7.
Attach a compression tester to No. 1 cylinder.
8.
Depress accelerator pedal fully to keep throttle valve wide
open.
9.
Crank engine and record highest gauge indication.
10. Repeat the measurement on each cylinder as shown above.
I
Always use a fully-charged battery to obtain specified
engine speed.
Unit: kPa (kg/cm
2
, psi)/rpm
Standard
Minimum
Difference limit between
cylinders
1,275 (13.0, 185)/300
981 (10.0, 142)/300
98 (1.0, 14)/300
11. If compression in one or more cylinders is low:
a.
Pour a small amount of engine oil into cylinders through spark
plug holes.
b.
Retest compression.
I
If adding oil helps compression, piston rings may be worn
or damaged. If so, replace piston rings after checking pis-
ton.
I
If pressure stays low, a valve may be sticking or seating
improperly. Inspect and repair valve and valve seat. (Refer
to SDS, EM-88 and EM-91.) If valve or valve seat is dam-
aged excessively, replace them.
I
If compression stays low in two cylinders that are next to
each other:
a)
The cylinder head gasket may be leaking, or
b)
Both cylinders may have valve component damage. Inspect
and repair as necessary.
GI
MA
LC
EC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
MEASUREMENT OF COMPRESSION PRESSURE
EM-13
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Components
NHEM0008
SEM830GA
Removal
NHEM0009
CAUTION:
When removing the aluminum oil pan from engine, first
remove the crankshaft position sensor (POS) from the assem-
bly.
Be careful not to damage sensor edges and signal plate teeth.
1.
Remove engine undercover.
2.
Drain engine oil.
I
To avoid the danger of being scalded, never drain the
engine oil when the engine is hot.
SEM956F
3.
Loosen steel oil pan bolts in reverse order shown in the figure.
OIL PAN
Components
EM-14
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