Infiniti G37 Coupe. Manual - part 621

TIMING CHAIN

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

5.

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

a.

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.

b.

Push plunger into the inside of tensioner body.

c.

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

d.

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 is 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.

e.

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).

f.

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

6.

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

7.

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

1

: Slack guide

3

: Cylinder block

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A

:  Bank  1

B

:  Bank  2

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TIMING CHAIN

8.

Install new front oil seal on front timing chain case.

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

inverted.

9.

Install front timing chain case as follows:
• Check that O-rings stay in place during installation to rear timing chain case.

a.

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 equivalent. Refer to

GI-15, "Recommended Chemical Products and Sealants"

.

: Engine inside

: Engine outside

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B

: Protrusion

c

: 3.4 - 4.4 mm (0.134 - 0.173 in) dia.

d

: 2.6 - 3.6 mm (0.102 - 0.142 in) dia.

e

: 4.0 - 5.6 mm (0.157 - 0.220 in)

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TIMING CHAIN

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b.

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

Use Genuine RTV Silicone Sealant or equivalent. Refer
to

GI-15, "Recommended Chemical Products and Sealants"

.

c.

Assemble front timing chain case.

CAUTION:

• Be careful not to damage front oil seal by interference

with front end of crankshaft.

• Attaching should be done within 5 minutes after liquid

gasket application.

d.

Install front timing chain case fitting its dowel pin hole together with dowel pin on rear timing chain case.

e.

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.

f.

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

CAUTION:

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

g.

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

10. Install intake valve timing control covers as follows:

A

: 4.0 - 5.0 mm (0.157 - 0.197 in) dia.

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1

: Front timing chain case

2

: Oil pan (upper)

3

: 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-75, "Exploded View"

.

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TIMING CHAIN

a.

Install new seal rings (1) in shaft grooves.

CAUTION:

When replacing seal ring, replace all rings with new ones.
NOTE:
The figure shows an example of bank 2.

b.

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

CAUTION:

• 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.

c.

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

d.

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.

11. Install oil pan (lower). Refer to 

EM-42, "Exploded View"

.

12. Install rocker covers (bank 1 and bank 2). Refer to 

EM-45, "Exploded View"

.

13. Install crankshaft pulley as follows:

a.

Fix crankshaft using the ring gear stopper [SST: KV10118600 (J-48641)].

b.

Install crankshaft pulley, taking care not to damage front oil seal.
• When press-fitting crankshaft pulley with plastic hammer, tap on its center portion (not circumference).

c.

Tighten crankshaft pulley bolt.

d.

Tighten the bolt 90 degrees (one mark) (b).
• Place a matching mark (A) on crankshaft pulley (2) aligning

with the matching (C) of crankshaft pulley bolt (1).

e.

Rotate crankshaft pulley in normal direction (clockwise when viewed from front) to confirm it turns
smoothly.

14. For the following operations, perform steps in the reverse order of removal.

Inspection

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INSPECTION AFTER REMOVAL

A

: Bank 2

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A

: Bank 1

B

: Bank 2

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: 44.1 N·m (4.5 kg-m, 33 ft-lb)

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