Infiniti Q45. Manual - part 565

CYLINDER HEAD

EM-77

●

If not, grind to adjust valve fitting and check again. If the contacting surface still has NG conditions even
after the re-check, replace valve seat. Refer to

EM-77, "VALVE SEAT REPLACEMENT"

VALVE SEAT REPLACEMENT

When valve seat is removed, replace with oversized (0.5 mm, 0.020 in) valve seat.

Bore out old seat until it collapses. Boring should not continue beyond the bottom face of the seat recess
in cylinder head. Set the machine depth stop to ensure this.

CAUTION:

Prevent to scratch cylinder head by excessive boring.

Ream cylinder head recess diameter for service valve seat.

●

Be sure to ream in circles concentric to the valve guide center.

●

This will enable valve seat to fit correctly.

Heat cylinder head to 110 to 130

C (230 to 266

F) by soaking in

heated oil.

Provide valve seats cooled well with dry ice. Force fit valve seat into cylinder head.

WARNING:

Cylinder head contains heat, when working wear protective equipment to avoid getting burned.

CAUTION:

Avoid directly touching cold valve seats.

Using the valve seat cutter set (commercial service tool) and
valve seat grinder, finish the seat to the specified dimensions.
Refer to

EM-114, "Valve Seat"

CAUTION:

When using the valve seat cutter, firmly grip the cutter han-
dle with both hands. Then, press on the contacting surface
all around the circumference to cut in a single drive.
Improper pressure on with the cutter or cutting many differ-
ent times may result in stage valve seat.

Using compound, grind to adjust valve fitting.

Check again for normal contact. Refer to

EM-76, "VALVE SEAT CONTACT"

Oversize [0.5 mm (0.020 in)]

Intake : 37.500 - 37.516 mm (1.4764 - 1.4770 in)

Exhaust : 32.700 - 32.716 mm (1.2874 - 1.2880 in)

SEM795A

SEM008A

SEM934C

EM-78

CYLINDER HEAD

VALVE SPRING SQUARENESS

Set try square along the side of valve spring and rotate the spring.
Measure the maximum clearance between the top face of spring and
try square.

●

If it exceeds the limit, replace valve spring.

VALVE SPRING DIMENSIONS AND VALVE SPRING PRESSURE LOAD

Check valve spring pressure at specified spring height.

CAUTION:

Do not remove valve spring seat from valve spring (parts for
assembly).

●

If out of the standard, replace valve spring.

Limit

: 2.0 mm (0.079 in)

PBIC0080E

Standard:

Intake and exhaust

Free height

: 46.35 - 46.85 mm (1.8247 - 1.8444 in)

Installation height

: 33.8 mm (1.331 in)

Installation load

: 165 - 189 N (16.8 - 19.3 kg, 37 - 42 lb)

Height during valve open

: 24.4 mm (0.961 in)

Load with valve open

: 290 - 330 N (29.6 - 33.7 kg, 65 - 74 lb)

SEM113

ENGINE ASSEMBLY

EM-79

ENGINE ASSEMBLY

PFP:10001

Removal and Installation

NBS001P1

WARNING:

●

Situate vehicle on a flat and solid surface.

●

Place chocks at 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, avoid forceful or uninstructed operations.

●

Do not 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-point lift type or separate type lift as best you can. If board-on type is used for
unavoidable reasons, support at the rear axle jacking point with transmission jack or similar tool
before starting work, in preparation for the backward shift of center of gravity.

●

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

GI-39, "Garage Jack and

Safety Stand"

REMOVAL
Outline

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

Preparation

Release fuel pressure. Refer to

EC-80, "FUEL PRESSURE RELEASE"

Rear engine mounting insulator

Rear member

Left engine mounting bracket

Heat insulator

Left engine mounting insulator

Right engine mounting bracket

Heat insulator

Right engine mounting insulator

PBIC0081E

EM-80

ENGINE ASSEMBLY

Drain engine coolant from radiator drain plug. Refer to

CO-8, "Changing Engine Coolant"

CAUTION:

●

Perform this step when the engine is cold.

●

Do not spill engine coolant on drive belt.

Remove the following:

●

Engine cover, battery cover and air cleaner cover; Refer to

EM-13, "ENGINE ROOM COVER"

●

Battery and battery tray; Refer to

SC-4, "BATTERY"

●

Air duct (inlet), air duct and air cleaner case assembly; Refer to

EM-17, "AIR CLEANER AND AIR

DUCT"

●

Radiator hoses and A/T fluid cooler hoses; Refer to

CO-11, "RADIATOR"

●

Cooling fan shroud assembly; Refer to

CO-18, "COOLING FAN"

CAUTION:

After the removal, protect the radiator with a cover not to be damaged.

Engine Room Left

Disconnect heater hoses, and install plugs to avoid leakage of engine coolant.

Disconnect wire bonding exhaust manifold cover to vehicle.

Discharge refrigerant from A/C circuit. Refer to

ATC-146, "REFRIGERANT LINES"

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

ATC-

149, "Removal and Installation of Compressor"

Engine Room Right

Disconnect fuel feed hose at the engine side connection.

●

For disconnection/connection of quick connector, refer to

EM-32, "Removal and Installation"

Disconnect engine room harness from the connected position close to the alternator, and set it aside for
easier work.

Disconnect ground cable.

Disconnect vacuum hose between vehicle and engine and set it aside.

After draining fluid, remove power steering piping at the following parts:

●

Reservoir tank side between oil cooler and reservoir tank.

●

High pressure hose side between oil cooler and high pressure hose.

Vehicle inside

Separate engine room harness indoors, and pull out engine room harness toward the engine side, tack
them temporarily according to the following procedures.

Remove front kicking plate and dash side finisher. Refer to

EI-43, "BODY SIDE TRIM"

Remove instrument lower cover, glove box assembly and glove box cover. Refer to

IP-10, "INSTRUMENT

PANEL ASSEMBLY"

Separate all the harness connectors connected to engine harness on the indoor side.

Remove the intermediate fixed point, pull out engine connectors to the engine room side, then temporarily
on the engine.

CAUTION:

●

Pull out the harness and connectors carefully to avoid being damaged.

●

After the temporary tacking, cover those connectors with plastic bags to avoid adhering foreign
matters.