Infiniti G37 Coupe. Manual - part 623

ENGINE ASSEMBLY

EM-67

< REMOVAL AND INSTALLATION >

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REMOVAL AND INSTALLATION

ENGINE ASSEMBLY

Exploded View

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Removal and Installation

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WARNING:

• Situate the vehicle on a flat and solid surface.
• Place chocks at the front and back of rear wheels.
• For engines not equipped with engine slingers, attach proper slingers and bolts described in PARTS

CATALOG.

CAUTION:

• Always be careful to work safely, and avoid forceful or uninstructed operations.
• Never start working until exhaust system and engine coolant are cool enough.
• If items or work required are not covered by the engine section, refer to the applicable sections.
• Always use the support point specified for lifting.
• Use either 2-pole lift type or separate type lift as much as possible. If board-on type is used for

unavoidable reasons, support at rear axle jacking point with transmission jack or similar tool before
starting work, in preparation for the backward shift of the center of gravity.

• For supporting points for lifting and jacking point at rear axle, refer to 

GI-30, "Garage Jack and

Safety Stand and 2-Pole Lift"

.

REMOVAL

Outline

1.

Engine mounting bracket (RH)

2.

Engine mounting insulator (RH)

3.

Engine mounting bracket (LH)

4.

Engine mounting insulator (LH)

5.

Rear engine mounting member

6.

Engine mounting insulator (rear)

7.

Dynamic damper (M/T models)

8.

Dynamic damper (A/T models)

A.

Front mark

JPBIA1304GB

EM-68

< REMOVAL AND INSTALLATION >

ENGINE ASSEMBLY

At first, remove the engine and the transmission assembly with front suspension member facing downward.
Then separate the engine from transmission.

Preparation

1.

Release fuel pressure. Refer to 

EC-601, "Inspection"

.

2.

Disconnect both battery cables. Refer to 

PG-96, "Exploded View"

.

3.

Drain engine coolant from radiator. Refer to 

CO-8, "Draining"

.

CAUTION:

• Perform this step when engine is cold.
• Never spill engine coolant on drive belts.

4.

Remove the following parts:
• Radiator reservoir tank: Refer to 

CO-14, "Exploded View"

.

• Engine cover: Refer to 

EM-24, "Exploded View"

.

• Front road wheel and tires (power tool)
• Engine undercover (power tool)
• Cowl top cover: Refer to 

EXT-21, "Exploded View"

.

• Air duct and air cleaner case assembly (RH and LH): Refer to 

EM-26, "Exploded View"

.

• Cooling fan assembly: Refer to 

CO-14, "Exploded View"

.

5.

Discharge refrigerant from A/C circuit. Refer to 

CO-17, "Exploded View"

.

6.

Remove radiator hoses (upper and lower). Refer to 

CO-14, "Exploded View"

.

Engine Room LH

1.

Disconnect heater hose at vehicle side, and fit a plug onto hose end to prevent engine coolant leakage.

2.

Disconnect A/C piping from A/C compressor, and temporarily fasten it on vehicle with a rope. Refer to 

HA-

38, "Exploded View"

.

3.

Disconnect brake booster vacuum hose.

4.

Disconnect ground cable.

Engine Room RH

1.

Disconnect battery positive cable at vehicle side and temporarily fasten it on engine. 

2.

Disconnect all clips and connectors of the engine room harness from engine back side.

3.

Disconnect fuel feed hose (with damper) and EVAP hose. Refer to 

EM-36, "Exploded View"

.

CAUTION:

Fit plugs onto disconnected hoses to prevent fuel leakage.

4.

Remove reservoir tank of power steering oil pump and piping from vehicle, and temporarily secure them
on engine. Refer to 

ST-45, "Exploded View"

.

CAUTION:

When temporarily securing, keep the reservoir tank upright to avoid fluid leakage.

Vehicle Inside

Follow the procedure below to disconnect engine room harness connectors at passenger room side, and tem-
porarily secure them on engine.

1.

Remove passenger-side kicking plate and dash side finisher. Refer to 

INT-14, "Exploded View"

.

2.

Disconnect engine room harness connectors at unit sides TCM, ECM and other locations.

3.

Disengage intermediate fixing point. Pull out engine room harnesses to engine room side, and temporarily
secure them on engine.

CAUTION:

• When pulling out harnesses, take care not to damage harnesses and connectors.
• After temporarily securing, cover connectors with vinyl or similar material to protect against

adhesion of foreign materials.

Vehicle Underbody

1.

Remove A/T fluid cooler hoses (A/T models) and power steering oil pump oil cooler hoses.
• Install plug to avoid leakage of A/T fluid and power steering fluid.

2.

Disconnect heated oxygen sensor 2 harness.

3.

Remove three way catalyst and exhaust front tube. Refer to 

EX-5, "Exploded View"

.

ENGINE ASSEMBLY

EM-69

< REMOVAL AND INSTALLATION >

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4.

Disconnect steering lower joint at power steering gear assembly side, and release steering lower shaft.
Refer to 

ST-20, "WITHOUT 4WAS : Exploded View"

 (without 4WAS models) or 

ST-21, "WITH 4WAS :

Exploded View"

 (with 4WAS models).

5.

Remove rear propeller shaft. Refer to 

DLN-7, "Exploded View"

 (M/T models) or 

DLN-14, "Exploded View"

(A/T models).

6.

Disengage shift lever and remove clutch tube (M/T models). Refer to 

TM-18, "Exploded View"

.

7.

Disengage A/T control rod at control device assembly side. Then, temporarily secure it on the transmis-
sion assembly, so that it does not sag (A/T models). Refer to 

TM-227, "Exploded View"

. 

8.

Remove rear plate cover from oil pan (upper). Then remove bolts fixing drive plate to torque converter (A/
T models). Refer to 

EM-42, "Exploded View"

. 

9.

Remove transmission joint bolts that pierce at oil pan (upper) lower rear side. Refer to 

EM-42, "Exploded

View"

.

10. Remove front stabilizer connecting rod from transverse link. Refer to 

FSU-19, "Exploded View"

. 

11. Remove lower ends of left and right steering knuckle from transverse link. Refer to 

FSU-23, "Exploded

View"

. 

12. Separate steering outer sockets from steering knuckle. Refer to 

ST-26, "Exploded View"

. 

13. Remove transverse links mounting bolts at suspension member side. Refer to 

FSU-23, "Exploded View"

. 

Removal Work

1.

Use a manual lift table caddy (commercial service tool) or equiv-
alently rigid tool such as a transmission jack. Securely support
bottom of suspension member and the transmission assembly.

CAUTION:

Use a piece of wood or a similar item as the supporting sur-
face to secure a completely stable condition.

2.

Remove rear engine mounting member bolts.

3.

Remove front suspension member mounting bolts and nuts. Refer to 

FSU-23, "Exploded View"

. 

4.

Carefully lower jack, or raise lift, to remove the engine, the transmission assembly and front suspension
member. When performing work, observe the following caution items:

CAUTION:

• Confirm there is no interference with the vehicle.
• Check that all connection points have been disconnected.
• Keep in mind that the center of gravity of the vehicle changes. If necessary, use jack(s) to sup-

port the vehicle at rear jacking point(s) to prevent it from falling off the lift.

Separation Work

1.

Install engine slingers into front of cylinder head (bank 1) and
rear of cylinder head (bank 2).

2.

Remove power steering oil pump from engine side. Refer to 

ST-34, "EXCEPT FOR SPORT MODELS :

Exploded View"

.

PBIC0804E

1

: Engine front slinger

2

: Engine rear slinger

A

:  Bank  1 

B

:  Bank  2

: Engine front

Slinger bolts:  

: 28.0 N·m (2.9 kg-m, 21 ft-lb)

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EM-70

< REMOVAL AND INSTALLATION >

ENGINE ASSEMBLY

3.

Remove engine mounting insulators (RH and LH) under side nuts with power tool.

4.

Lift with hoist and separate the engine and the transmission assembly from front suspension member.

CAUTION:

• Before and during this lifting, always check that any harnesses are left connected.
• Never damage engine mounting insulator and avoid oil/grease smearing or spills onto engine

mounting insulator.

5.

Remove alternator. Refer to 

CHG-25, "Exploded View"

.

6.

Remove starter motor. Refer to 

STR-15, "Exploded View"

.

7.

Separate the engine from the transmission assembly. Refer to 

TM-25, "Exploded View"

 (M/T models) or

TM-263, "Exploded View"

 (A/T models).

8.

Remove each engine mounting insulator and each engine mounting bracket from the engine with power
tool.

INSTALLATION

Note the following, and install in the reverse order of removal.
• Do not damage engine mounting insulator and do not spill oil on it.
• For a location with a positioning pin, insert it securely into hole of mating part.
• For a part with a specified installation orientation, refer to component figure in 

EM-67, "Exploded View"

.

• When installing engine mounting bracket (RH and LH) on cylinder

block, tighten two upper bolts [shown as (B) in the figure] first.
Then tighten two lower bolts [shown as (C) in the figure].

• Check that all engine mounting insulators are seated properly, then tighten mounting nuts.
• Tighten rear engine mounting member bolts in numerical order as

shown in the figure.

Inspection

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INSPECTION AFTER INSTALLATION

Inspection for Leakage

The following are procedures for checking fluid leakage, lubricant leakage.

• Before starting engine, check oil/fluid levels including engine coolant and engine oil. If any are less than the

required quantity, fill them to the specified level. Refer to 

MA-10, "Fluids and Lubricants"

.

• Follow the procedure below to check for fuel leakage.
- Turn ignition switch to the “ON” position (with engine stopped). With fuel pressure applied to fuel piping,

check for fuel leakage at connection points.

- Start engine. With engine speed increased, check again for fuel leakage at connection points.
• Run engine to check for unusual noise and vibration.

NOTE:

A

: Example Left

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: Vehicle front

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