Infiniti G37 Coupe. Manual - part 619

TIMING CHAIN

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a.

Remove rear cover plate and set the ring gear stopper [SST:
KV10118600 (J-48641)] (A) as shown in the figure.

b.

Loosen crankshaft pulley bolt and rotate bolt seating surface at
10 mm (0.39 in) from its original position.

CAUTION:

Never remove crankshaft pulley bolt because it is used as a
supporting point for suitable puller.

c.

Place suitable puller tab on holes of crankshaft pulley, and pull
crankshaft pulley through.

CAUTION:

Never put suitable puller tab on crankshaft pulley periphery,
because this damages internal damper.

29. Remove oil pan (lower). Refer to 

EM-42, "Exploded View"

.

30. Loosen two mounting bolts in front of oil pan (upper) with power

tool in reverse order as shown in the figure.

31. Remove front timing chain case as follows:

1

: Oil pan (upper)

2

: Flywheel (M/T models) or drive plate (A/T models)

: Vehicle front

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1

: Crankshaft pulley

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: Engine front

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TIMING CHAIN

a.

Loosen mounting bolts in reverse order as shown in the figure.

b.

Insert a suitable tool (A) into the notch at the top of front timing
chain case as shown.

c.

Pry off case by moving the suitable tool as shown.
• Use the seal cutter [SST: KV10111100 (J37228)] to cut liquid

gasket for removal. 

CAUTION:

• Never use a screwdriver or a similar item.   
• After removal, handle front timing chain case carefully so

it does not tilt, cant, or warp under a load.

32. Remove front oil seal from front timing chain case using a suit-

able tool.
• Use a screwdriver for removal.

CAUTION:

Be careful not to damage front timing chain case.

33. Remove O-ring (1) from rear timing chain case.

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A

:  Bank  1

B

:  Bank  2

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TIMING CHAIN

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34. Remove timing chain tensioner (primary) as follows:

a.

Remove lower mounting bolt (1).

b.

Loosen upper mounting bolt (2) slowly, and then turn timing
chain tensioner (primary) (3) on the upper mounting bolt so that
plunger (4) is fully expanded.
NOTE:
Even if plunger is fully expanded, it does not drop from the body
of timing chain tensioner (primary).

c.

Remove upper mounting bolt, and then remove timing chain ten-
sioner (primary).

35. Remove internal chain guide (1), slack guide (2) and tension

guide (3).

36. Remove timing chain (primary) and crankshaft sprocket.

CAUTION:

After removing timing chain (primary), never turn crankshaft and camshaft separately, or valves
strike the piston heads.

37. Remove timing chain (secondary) and camshaft sprockets as follows:

a.

Attach suitable stopper pin (C) to the timing chain tensioners
(secondary) (1), (2).

NOTE:
• Use approximately 0.5 mm (0.02 in) dia. hard metal pin as a

stopper pin.

• For removal of timing chain tensioners (secondary), refer to

EM-83, "Exploded View"

. (Removing VVEL ladder assembly is

required.)

b.

Remove camshaft sprocket (EXH) mounting bolt.
• Secure the hexagonal portion of camshaft (EXH) using a wrench to loosen mounting bolt.

CAUTION:

Never loosen the mounting bolt by securing anything other than the camshaft (EXH) hexagonal
portion or with tensioning the timing chain.

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A

:  Bank  1

B

:  Bank  2

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TIMING CHAIN

c.

Remove camshaft sprocket (INT) mounting bolt.
• Secure the hexagonal portion (located in between journal No.

1 and journal No. 2) of drive shaft (A) using a wrench to loosen
mounting bolt.

CAUTION:

• Never loosen the mounting bolt by securing anything

other than the drive shaft hexagonal portion or with ten-
sioning the timing chain.

• When holding the hexagonal part of drive shaft on the

intake side with a wrench, be careful not to allow the wrench to cause interference with other
parts.

• Never disassemble camshaft sprocket (INT). [Never

loosen bolts (A) as shown in the figure.]

d.

Remove timing chain (secondary) together with camshaft sprockets.

38. Use a scraper to remove all traces of old liquid gasket from front

and rear timing chain cases and oil pan (upper), and liquid gas-
ket mating surfaces.

CAUTION:

Be careful not to allow gasket fragments to enter oil pan.

39. Remove old liquid gasket from bolt hole and thread.

INSTALLATION

NOTE:
The figure below shows the relationship between the matching mark on each timing chain and that on the cor-
responding sprocket with the components installed.

1

: Camshaft (EXH) (bank 2)

: Engine front

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A

: Remove old liquid gasket that is stuck

B

: Bolt hole

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