Infiniti G37 Coupe. Manual - part 616

FUEL INJECTOR AND FUEL TUBE

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1.

Install fuel damper (4) as follows:

a.

Install new O-ring (1) to fuel tube as shown. When handling new
O-ring, pay attention to the following caution items:

CAUTION:

• Handle O-ring with bare hands. Never wear gloves.
• Lubricate O-ring with new engine oil.
• Never clean O-ring with solvent.
• Check that O-ring and its mating part are free of foreign

material.

• When installing O-ring, be careful not to scratch it with

tool or fingernails. Also be careful not to twist or stretch
O-ring. If O-ring was stretched while it was being
attached, do not insert it quickly into fuel tube.

• Insert new O-ring straight into fuel tube. Never twist it.

b.

Install spacer (3) to fuel damper.

c.

Insert fuel damper straight into fuel tube.

CAUTION:

• Insert straight, making sure that the axis is lined up.
• Never pressure-fit with excessive force.

• Insert fuel damper until (A) is touching (B) of fuel tube.

d.

Install the cut-out (A) of the clip (2) to the projection (B), which
ensures that the fuel tube does not move or rotate.

e.

Unlock the clip after making sure that the rib of the cup and the
brim of the fuel damper are mated each other and positioned in
the holes (C) of the clip.

f.

Check that the opening (B) and the slit (C) of the clip are posi-
tioned and fixed properly so it does not rotate or pull out.

2.

Install fuel sub-tube.
• When handling new O-rings, be careful of the following caution items:

CAUTION:

• Handle O-ring with bare hands. Never wear gloves.
• Lubricate O-ring with new engine oil.
• Never clean O-ring with solvent.
• Check that O-ring and its mating part are free of foreign material.

2

:  Cup

5

:  Clip

C

:  Cut-out

Reference value

: 130 N (13.3 kg, 29.2 lb)

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: Fuel tube

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: Under view

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< ON-VEHICLE REPAIR >

FUEL INJECTOR AND FUEL TUBE

• When installing O-ring, be careful not to scratch it with tool or fingernails. Also be careful not

to twist or stretch O-ring. If O-ring was stretched while it was being attached, never insert it
quickly into fuel tube.

• Insert new O-ring straight into fuel tube. Never decenter or twist it.

• Insert fuel sub-tube straight into fuel tube.
• Tighten mounting bolts evenly in turn.
• After tightening mounting bolts, Check that there is no gap between flange and fuel tube.

3.

Install new O-rings to fuel injector, paying attention to the following items.

CAUTION:

• Upper and lower O-ring are different. Be careful not to confuse them.

• Handle O-ring with bare hands. Never wear gloves.
• Lubricate O-ring with new engine oil.
• Never clean O-ring with solvent.
• Check that O-ring and its mating part are free of foreign material.
• When installing O-ring, be careful not to scratch it with tool or fingernails. Also be careful not to

twist or stretch O-ring. If O-ring was stretched while it was being attached, never insert it quickly
into fuel tube.

• Insert O-ring straight into fuel injector. Never decenter or twist it.

4.

Install fuel injector to fuel tube as follows:

a.

Insert clip (3) into clip mounting groove (F) on fuel injector (5).

CAUTION:

• Never reuse clip. Replace it with a new one.
• Be careful to keep clip from interfering with O-ring. If

interference occurs, replace O-ring.

• Insert clip so that protrusion (E) of fuel injector matches

cut-out (C) of clip.

b.

Insert fuel injector into fuel tube (1) with clip attached.
• Insert it while matching it to the axial center.
• Insert fuel injector so that protrusion (A) of fuel tube matches

cutout (B) of clip.

• Check that fuel tube flange (G) is securely fixed in flange fixing

groove (D) on clip.

c.

Check that installation is complete by checking that fuel injector
does not rotate or come off.
• Check that protrusions of fuel injectors and fuel tube are

aligned with cutouts of clips after installation.

5.

Install fuel tube and fuel injector assembly to intake manifold.

CAUTION:

Be careful not to let tip of injector nozzle come in contact with other parts.
• Tighten mounting bolts in two steps in numerical order as

shown in the figure.

Fuel tube side

: Black

Nozzle side

: Green

2

: O-ring (Black)

4

: O-ring (Green)

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: Engine front

 1st step: 10.1 N·m (1.0 kg-m, 7 ft-lb)

 2nd step: 23.6 N·m (2.4 kg-m, 17 ft-lb)

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FUEL INJECTOR AND FUEL TUBE

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6.

Connect injector sub-harness.

7.

Install fuel sub tube mounting bolt.

8.

Connect fuel feed hose (with damper).
• Handling procedure of O-ring is the same as that of fuel damper and fuel sub-tube.
• Insert fuel damper straight into fuel sub-tube.
• Tighten mounting bolts evenly in turn.
• After tightening mounting bolts, check that there is no gap between flange and fuel sub-tube.

9.

Connect quick connector between fuel feed hose (with damper) and centralized under-floor piping con-
nection as follows:

a.

Check that no foreign substances are deposited in and around centralized under-floor piping and quick
connector, and that there is no damage to them.

b.

Thinly apply new engine oil around centralized under-floor piping from tip end to spool end.

c.

Align center to insert quick connector (1) straightly into central-
ized under-floor piping.

• Insert quick connector to centralized under-floor piping until

top spool (2) is completely inside quick connector and 2nd
level spool (3) exposes just below quick connector.

CAUTION:

• Hold (A) position as shown in the figure when inserting

centralized under-floor piping into quick connector.

• Carefully align center to avoid inclined insertion to prevent damage to O-ring inside quick con-

nector.

• Insert until a “click” sound is heard and the engagement is felt.
• To avoid misidentification of engagement with a similar sound, be sure to perform the next step.

d.

Pull quick connector by hand holding (A) position. Check that it
is completely engaged (connected) so that it does not come out
from centralized under-floor piping.

e.

Install quick connector cap (3) to quick connector connection.
• Install quick connector cap with arrow on surface facing in the

direction of quick connector (fuel feed hose side).

CAUTION:

If quick connector cap cannot be installed smoothly, quick connector may have not been installed
correctly. Check the connection again.

10. Install in the reverse order of removal after this step.

Inspection

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INSPECTION AFTER INSTALLATION

Check for Fuel Leakage

1.

Turn ignition switch “ON” (with the engine stopped). With fuel pressure applied to fuel piping, check that
there is no fuel leakage at connection points.
NOTE:
Use mirrors for checking at points out of clear sight.

2.

Start the engine. With engine speed increased, check that again that there is no fuel leakage at connec-
tion points.

CAUTION:

Never touch the engine immediately after it is stopped because the engine is extremely hot.

B

: Fitted condition

: Upright insertion

1

: Centralized under-floor piping

2

: Fuel feed hose

B

: Under view

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OIL PAN (LOWER)

OIL PAN (LOWER)

Exploded View

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Removal and Installation

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REMOVAL

CAUTION:

Drain engine oil when the engine is hot to avoid the danger of being scalded.

1.

Remove engine undercover with power tool.

2.

Remove oil pan (lower) as follows:

1.

Oil level gauge

2.

Oil level gauge guide

3.

O-ring

4.

O-ring

5.

O-ring

6.

Oil cooler

7.

Connector bolt

8.

Oil filter

9.

Relief valve

10. Oil strainer

11.

Oil pressure switch

12. Oil temperature sensor

13. Washer

14. Oil pan (upper)

15. Drain plug

16. Drain plug washer

17. Oil pan (lower)

18. Rear plate cover

19. Rear cover plate (M/T models)

A.

Refer to 

LU-9

B.

To oil pump

C.

Oil pan side

Refer to 

GI-4, "Components"

 for symbols in the figure.

PBIC5312E