Infiniti FX35, FX50 (S51). Manual - part 989

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< UNIT DISASSEMBLY AND ASSEMBLY >

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CYLINDER BLOCK

Disassembly and Assembly

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DISASSEMBLY

1.

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

EM-208, "Exploded View"

.

• Front cover and timing chain: Refer to 

EM-212, "Exploded View"

.

• Cylinder head: Refer to 

EM-245, "Exploded View"

.

2.

Remove knock sensor.

CAUTION:

Carefully handle knock sensor avoiding shocks.

3.

Remove oil filter (for VVEL ladder assembly) from cylinder block, if necessary. Refer to 

EM-245,

"Exploded View"

.

4.

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

EM-265, "Inspection"

.

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.

Loosen mounting bolts, and remove connecting rod bearing cap.

c.

Using a hammer handle (A) or similar tool, push piston and con-
necting 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-265, "Inspection"

.

10. Main bearing cap sub bolt

11. Main bearing cap bolt

12. Connecting rod cap bolt

13. Connecting rod cap

14. Connecting rod bearing

15. Connecting rod

16. Snap ring

17. Piston pin

18. Piston

19. Oil ring

20. Second ring

21. Top ring

22. Pilot converter

23. Piston oil jet

24. Drive plate

25. Reinforcement plate

26. Rear oil seal

27. Rear oil seal retainer

28. Cylinder block heater (for Canada)

A.

Refer to 

EM-256

B.

Chamfered

: Crankshaft side

Refer to 

GI-4, "Components"

 for symbol marks in the figure.

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• 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 per the following: 

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 an equivalent.

c.

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

8.

Remove rear oil seal and rear oil seal retainer assembly from cylinder block.
• Insert screwdriver or similar tool between rear end of crankshaft counter weight and rear oil seal

retainer, and separate liquid gasket to remove.

CAUTION:

Be careful not to damage the mating surfaces.

9.

Using screwdriver or similar tool, and lever off rear oil seal from rear oil seal retainer.

10. Remove main bearing cap as per the following:

• Before loosening cylinder block bolts, measure the crankshaft end play. Refer to 

EM-265, "Inspection"

.

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CYLINDER BLOCK

a.

Loosen side bolts starting from No. 30 to 21 to remove.

b.

Loosen main bearing cap sub bolts starting from No. 20 to 11 to
remove.

c.

Loosen main bearing cap bolts starting from No. 10 to 1 to
remove.

d.

Remove the main bearing cap.
• Insert bolts (1) into bolt holes, and then remove main bearing

cap (2) by lifting up and shaking forward and backward.

CAUTION:

Be careful not to damage the mounting surface.

11. Remove crankshaft.

12. Remove main bearings and thrust bearings from main bearing cap and 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 pilot converter using the pilot bushing puller (commercial service tool), if necessary.

14. 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.

: Engine front

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2.

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

• Tighten each plug as specified below.

• Replace washers (1), (5) with new ones.
• Apply sealant to the thread of water drain plug (3).

Use Genuine RTV Silicone Sealant or an equivalent. Refer
to 

GI-16, "Recommended Chemical Products and Seal-

ants"

.

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

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

GI-16, "Recommended Chemical

Products and Sealants"

.

3.

Install oil jet.
• Insert oil jet into cylinder block hole, and tighten the mounting

bolt on the corner side (A) first.

4.

Install pilot converter to crankshaft, if removed.
• With drift [outer diameter: approx. 35 mm (1.38 in)], press-fit

as far as it will go.

: Engine front

Part

Tightening torque

Plug (2)

78.0 N·m (8.0 kg-m, 58 ft-lb)

Water drain plug (3)

19.6 N·m (2.0 kg-m, 14 ft-lb)

Plug (4)

65.0 N·m (6.6 kg-m, 48 ft-lb)

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