Infiniti G37 Coupe. Manual - part 634

CYLINDER BLOCK

EM-111

< DISASSEMBLY AND ASSEMBLY >

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Disassembly and Assembly

INFOID:0000000001547566

DISASSEMBLY

1.

Remove the following parts:
• Oil pans (lower and upper): Refer to 

EM-75, "Exploded View"

.

• Front and rear timing chain case: Refer to 

EM-48, "Exploded View"

 and 

EM-78, "Exploded View"

.

• Cylinder head: Refer to 

EM-100, "Exploded View"

.

2.

Remove knock sensor.

CAUTION:

Carefully handle sensor avoiding shocks.

3.

Remove baffle plate from lower cylinder block.

4.

Remove piston and connecting rod assembly with the following procedure:
• Before removing piston and connecting rod assembly, check the connecting rod side clearance. Refer to

EM-148, "Connecting Rod Bearing"

.

CAUTION:

Be careful not to drop connecting rod bearing, and to scratch the surface.

a.

Position crankshaft pin corresponding to connecting rod to be removed onto the bottom dead center.

b.

Remove connecting rod bearing cap.

c.

Using a hammer handle or similar tool, push piston and connect-
ing rod assembly out to the cylinder head side.

CAUTION:

Be careful not to damage the cylinder wall and crankshaft
pin, resulting from an interference of the connecting rod big
end.

5.

Remove connecting rod bearings from connecting rod and connecting rod bearing cap.

CAUTION:

• Be careful not to drop connecting rod bearing, and to scratch the surface.
• Identify installation positions, and store them without mixing them up.

6.

Remove piston rings from piston.
• Before removing piston rings, check the piston ring side clearance. Refer to 

EM-143, "Cylinder Block"

.

• Use a piston ring expander (commercial service tool) (A).

CAUTION:

• When removing piston rings, be careful not to damage

piston.

• Be careful not to damage piston rings by expanding them

excessively.

7.

Remove piston from connecting rod as follows: 

A.

Refer to 

EM-111

B.

Chamfered

C.

Front mark

: Crankshaft side

PBIC2940E

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EM-112

< DISASSEMBLY AND ASSEMBLY >

CYLINDER BLOCK

a.

Using snap ring pliers (A), remove snap rings.

b.

Heat piston to 60 to 70

°

C (140 to 158

°

F) with an industrial use

dryer (A) or equivalent.

c.

Push out piston pin using a stick than has an outer diameter of
approximately 20 mm (0.79 in).

8.

Remove lower cylinder block bolts.
NOTE:
Use TORX socket for bolts No.1 to 16.
• Before loosening lower cylinder block bolts, measure the crankshaft end play. Refer to 

EM-143,

"Cylinder Block"

.

• Loosen lower cylinder block bolts in the reverse order shown

in the figure in several different steps.

9.

Remove lower cylinder block as follows:

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: Engine front

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CYLINDER BLOCK

EM-113

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Screw M8 bolt [pitch: 1.25 mm (0.049 in) length: approximately
50 mm (1.97 in)] into bolt holes (A). Then equally tighten each
bolt, and remove lower cylinder block.

CAUTION:

• Be careful not to damage the mounting surfaces.
• Never tighten bolts excessively.
• Never insert screwdriver, this will damage the mating sur-

face.

10. Remove crankshaft.
11. Pull rear oil seal out from rear end of crankshaft.

12. Remove main bearings and thrust bearings from cylinder block and lower cylinder block.

CAUTION:

• Be careful not to drop main bearing, and to scratch the surface.
• Identify installation positions, and store them without mixing them up.

13. Remove oil jet.

ASSEMBLY

1.

Fully air-blow engine coolant and engine oil passages in cylinder block, cylinder bore and crankcase to
remove any foreign material.

CAUTION:

Use goggles to protect your eyes.

2.

Install each plug to cylinder block as shown in the figure.

• Apply sealant to the thread of water drain plug (1).

Use Genuine RTV Silicone Sealant or equivalent. Refer to

GI-15, "Recommended Chemical Products and Sealants"

.

• Apply sealant to the thread of plug (4).

Use Genuine High Strength Thread Locking Sealant or
equivalent. Refer to 

GI-15, "Recommended Chemical

Products and Sealants"

.

• Replace washers (2) with new ones.

• Tighten each plug as specified below.

3.

Install oil jet.

: Engine front

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3

: plug

: Engine front

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Part

Washer

Tightening torque

1

No

19.6 N·m (2.0 kg-m, 14 ft-lb)

3

Yes

78.0 N·m (8.0 kg-m, 58 ft-lb)

4

Yes

12.3 N·m (1.3 kg-m, 9 ft-lb)

EM-114

< DISASSEMBLY AND ASSEMBLY >

CYLINDER BLOCK

• Insert oil jet dowel pin (A) into cylinder block dowel pin hole,

and tighten mounting bolts.

4.

Install main bearings and thrust bearings as follows:

CAUTION:

Be careful not to drop main bearing, and to scratch the surface.

a.

Remove dust, dirt, and engine oil on bearing mating surfaces of cylinder block and lower cylinder block.

b.

Install thrust bearings (1) to both sides of the No. 3 journal hous-
ing on cylinder block.

• Install thrust bearings with the oil groove (E) facing crankshaft

arm (outside). 

c.

Install main bearings paying attention to the direction.

• Main bearing with oil hole (B) and groove (C) goes on cylinder

block. The one without them goes on lower cylinder block.

• Before installing main bearings, apply engine oil to the bearing

surface (inside). Do not apply engine oil to the back surface,
but thoroughly clean it.

• When installing, align main bearing stopper protrusion to cut-

out of cylinder block and lower cylinder block.

• Ensure the oil holes on cylinder block and those on the corresponding bearing are aligned.

5.

Install crankshaft to cylinder block.
• While turning crankshaft by hand, check that it turns smoothly. 

6.

Install lower cylinder block.
NOTE:
Lower cylinder block cannot be replaced as a single part, because it is machined together with cylinder
block.

: Engine front

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A

:  No.  1

B

:  No.  2

C

:  No.  3

D

:  No.  4

F

: Thrust bearing installation position

: Engine front

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A

: Cylinder block side

D

: Lower cylinder block side

: Engine front

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