Infiniti FX35, FX50 (S51). Manual - part 941

EM-64

< REMOVAL AND INSTALLATION >

[VQ35HR]

TIMING CHAIN

Never overtighten slack guide mounting bolts (2). It is nor-
mal for a gap (A) to exist under the bolt seats when mount-
ing bolts are tightened to the specification.

Install the timing chain tensioner (primary) with the following procedure:

Pull plunger stopper tab (A) up (or turn lever downward) so as to
remove plunger stopper tab from the ratchet of plunger (D).
NOTE:
Plunger stopper tab and lever (C) are synchronized.

Push plunger into the inside of tensioner body.

Hold plunger in the fully compressed position by engaging
plunger stopper tab with the tip of ratchet.

To secure lever, insert stopper pin (E) through hole of lever into
tensioner body hole (B).
• The lever parts and the plunger stopper tab are synchronized.

Therefore, the plunger will be secured under this condition.

NOTE:
Figure shows the example of 1.2 mm (0.047 in) diameter thin screwdriver being used as the stopper pin.

Install timing chain tensioner (primary) (1).
• Remove any dirt and foreign materials completely from the

back and the mounting surfaces of timing chain tensioner (pri-
mary).

Pull out stopper pin (A) after installing, and then release plunger.

Check again that the matching marks on sprockets and timing chain have not slipped out of alignment.

Install new O-rings (1) on rear timing chain case.

Install new front oil seal on front timing chain case.

: Slack guide

: Cylinder block

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: Bank 1

: Bank 2

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TIMING CHAIN

EM-65

< REMOVAL AND INSTALLATION >

[VQ35HR]

• Apply new engine oil to both oil seal lip (A) and dust seal lip

(B).

• Install it so that each seal lip is oriented as shown in the figure.

• Using a suitable drift [outer diameter: 60 mm (2.36 in)] (A),

press-fit oil seal until it becomes flush with front timing chain
case end face.

• Check the garter spring is in position and seal lip is not

inverted.

10. Install front timing chain case as per the following:

• Check O-rings stay in place during installation to rear timing chain case.

Apply a continuous bead of liquid gasket with the tube presser
(commercial service tool) to front timing chain case back side as
shown in the figure.

Use Genuine RTV Silicone Sealant or an equivalent. Refer
to

: Engine inside

: Engine outside

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: Protrusion

3.4 - 4.4 mm (0.134 - 0.173 in)

2.6 - 3.6 mm (0.102 - 0.142 in)

: 4.0 - 5.6 mm (0.157 - 0.220 in)

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EM-66

< REMOVAL AND INSTALLATION >

[VQ35HR]

TIMING CHAIN

Apply liquid gasket to top surface of oil pan (upper) as shown in
the figure.

Use Genuine RTV silicone Sealant or an equivalent. Refer to

Assemble front timing chain case.

CAUTION:

• Be careful not to damage front oil seal by interference

with front end of crankshaft.

• Attaching must be done within 5 minutes after liquid gas-

ket application.

Install front timing chain case as to fit its dowel pin hole together dowel pin on rear timing chain case.

Tighten mounting bolts to the specified torque in numerical order
as shown in the figure.
• There are two types of mounting bolts. Refer to the following

for locating bolts.

After all bolts are tightened, retighten them to the specified
torque in numerical order shown in the figure.

CAUTION:

Be sure to wipe out any excessive liquid gasket leaking on surface mating with oil pan (upper).

Install two mounting bolts in front of oil pan (upper) in numerical
order shown in the figure.

11. Install valve timing control covers (bank 1 and bank 2) as per the following:

4.0 - 5.0 mm (0.157 - 0.197 in)

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: Front timing chain case

: Oil pan (upper)

: Cylinder block

: Engine front

M10 bolts

: 1, 2, 3, 4, 5, 6, 7

: 55.0 N·m (5.6 kg-m, 41 ft-lb)

M6 bolts

: Except the above

: 12.7 N·m (1.3 kg-m, 9 ft-lb)

: Engine front

Tightening torque

: Refer to

EM-46, "Exploded View"

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TIMING CHAIN

EM-67

< REMOVAL AND INSTALLATION >

[VQ35HR]

Install new seal rings (1) in shaft grooves.

CAUTION:

When replacing seal ring, replace all rings with new one.

To check the joint between dowel pins and dowel pin holes,
check the looseness in the axle direction by pushing the circum-
ferential looseness (between dowel pins and dowel pin holes) by
twisting in the circumferential direction.

CAUTION:

Always perform this procedure when removing because the
gap between dowel pins and dowel pin holes may not be
caused on purpose.

Install valve timing control cover with new gasket to front timing
chain case.

CAUTION:

• Never face the magnet retarder side down to prevent mag-

net retarder from dropping.

• Check the mating surface of magnet retarder and the

drum of exhaust side camshaft sprocket for foreign mate-
rials.

• Align the center of both shaft holes of the shaft and the

intake side camshaft sprocket, and then insert them.

• Be careful not to drop the seal ring from the shaft groove.
• When setting the valve timing control cover in position by hand, if valve timing control cover is

not contacting with the front timing chain case, the dowel pin of magnet retarder may not be
aligned with the dowel pin holes of cover. In this case, return to step “b”.

Being careful not to move seal ring from the installation groove, align dowel pins on front timing chain
case with holes to install valve timing control covers.

Tighten mounting bolts in numerical order as shown in the fig-
ure.

• After all bolts are tightened, tighten No. 1 bolt to the specified

torque again.

12. Install oil pan (lower). Refer to

EM-46, "Exploded View"

: Bank 2

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: Mating surface of magnet retarder

: Moves slightly

: Not shaken

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: Valve timing control cover

: Magnet retarder

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: Bank 1

: Bank 2

: Dowel pin hole

Tightening torque

: Refer to

EM-53, "Exploded View"

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