Infiniti M45 (Y34). Manual - part 536

CYLINDER BLOCK

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DISASSEMBLY

NOTE:
Explained here is how to disassemble with engine stand supporting transmission surface. When using differ-
ent type of engine stand, note with difference in steps and etc.

1.

Remove engine assembly. Refer to 

EM-76, "ENGINE ASSEMBLY"

 .

2.

Remove the parts that may restrict installation of engine to widely use engine stand.

NOTE:
The procedure is described assuming that you use a widely use engine stand holding the surface, to
which transmission is installed.

a.

Remove drive plate as follows:

i.

Remove rear plate cover. Refer to 

EM-25, "OIL PAN AND OIL STRAINER"

 .

ii.

Set the ring gear stopper (SST).

iii.

Loosen fixing bolts diagonally.

CAUTION:

●

Be careful not to damage drive plate. Especially, avoid
deforming and damaging of signal plate teeth (circumfer-
ence position).

●

Place drive plate with signal plate surface facing other
than downward.

●

Keep magnetic materials away from signal plate.

b.

Remove engine rear plate.

3.

Lift the engine with hoist to install it onto the widely use engine
stand.

CAUTION:

Use an engine stand that has a load capacity (240kg or more) large enough for supporting the
engine weight. 

●

If the load capacity of the stand is not adequate, remove the following parts beforehand to reduce the
potential risk of overturning the stand.

–

Remove intake manifold upper and intake manifold lower. Refer to 

EM-18, "INTAKE MANIFOLD"

 . 

–

Remove fuel injector and fuel tube (left and right). Refer to 

EM-31, "FUEL INJECTOR AND FUEL

TUBE"

 .

–

Remove ignition coil. Refer to 

EM-28, "IGNITION COIL"

 .

–

Remove rocker cover. Refer to 

EM-36, "ROCKER COVER"

 .

–

Other removable brackets.
NOTE:
The figure shows an example of widely use engine stand that
can hold mating surface of transmission with drive plate and
rear plate removed.

CAUTION:

Before removing the hanging chains, make sure the
engine stand is stable and there is no risk of overturning.

4.

Drain engine oil. Refer to 

LU-7, "Changing Engine Oil"

 .

PBIC1656E

PBIC0085E

EM-82

CYLINDER BLOCK

5.

Drain engine coolant from inside of engine by removing water
drain plug “B” as shown in the figure.

6.

Remove oil pan and oil strainer. Refer to 

EM-25, "OIL PAN AND OIL STRAINER"

 .

7.

Remove crankshaft pulley as follows:

a.

Lock crankshaft with a hammer handle or similar tool to loosen
fixing bolt.

b.

Pull crankshaft pulley with both hands to remove it.

CAUTION:

●

Do not remove fixing bolts. Keep loosened fixing bolts in
place to protect removed crankshaft pulley from drop-
ping.

●

Do not remove balance weight (inner hexagon bolt) at the
front of crankshaft pulley.

8.

Remove the following components and associated parts (The parts listed in step 3 are not included here.)

●

Front cover and timing chain: Refer to 

EM-38, "TIMING CHAIN"

 .

●

Camshaft: Refer to 

EM-49, "CAMSHAFT"

 .

●

Cylinder head: Refer to 

EM-65, "CYLINDER HEAD"

 .

9.

Remove knock sensor.

CAUTION:

Carefully handle the sensor, avoiding shocks.

10. Remove piston and connecting rod assembly.

●

Before removing piston and connecting rod assembly, check
the connecting rod side clearance. Refer to 

EM-96, "CON-

NECTING ROD SIDE CLEARANCE"

 .

a.

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

b.

Remove connecting rod cap. 

c.

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

11. Remove connecting rod bearings from connecting rod and con-

necting rod cap. 

CAUTION:

●

When removing them, note the installation position. Keep them in the correct order.

PBIC1265E

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CYLINDER BLOCK

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12. Remove piston rings form piston. 

●

Before removing piston rings, check the piston ring side clear-
ance. Refer to 

EM-97, "PISTON RING SIDE CLEARANCE"

 .

●

Use the piston ring expander (commercial service tool).

CAUTION:

●

When removing piston rings, be careful not to damage
piston.

●

Be careful not to damage piston rings by expanding
them excessively.

13. Remove piston from the connecting rod as follows. 

a.

Using the snap ring pliers, remove snap ring.

b.

Heat piston to 60 to 70

°

C (140 to 158

°

F) with industrial use drier

or equivalent.

c.

Push out piston pin with stick of outer diameter approximately 20
mm (0.8 in).

14. Remove rear oil seal retainer from cylinder block.

●

Insert a minus-head screwdriver or similar tool between the rear end of the crankshaft counter weight
and rear oil seal retainer, and separate the liquid gasket to remove.

CAUTION:

Be careful not to damage the mating surface.

15. Using a minus-head screwdriver or similar tool, and lever off rear oil seal from rear oil seal retainer.

PBIC0087E

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CYLINDER BLOCK

16. Remove main bearing cap as follows: 

●

Before loosening main bearing cap bolts, measure the crank-
shaft end play. Refer to 

EM-96, "CRANKSHAFT END PLAY"

 .

●

Loosen bolts in several different steps.

a.

Remove cover attached to the rear right side of cylinder block
(next to the starter motor housing).   

NOTE:
Bolts (No. 28 shown in the figure) are installed on inside of the
cover.

b.

Loosen the side bolts (M10) starting from 30 to 21 to remove.

c.

Loosen main bearing cap sub bolts (M9) starting from 20 to 11 to
remove.

d.

Loosen main bearing cap bolts (M12) starting from 10 to 1 to remove. 

e.

Using the main bearing cap remover (SST), remove main bear-
ing cap. 

17. Remove crankshaft.

18. Remove main bearings and thrust bearings from cylinder block and main bearing caps.

●

When removing them, note the installation position. Keep them in the correct order. 

19. If pilot converter must be removed, remove it from the rear end

of crankshaft using the pilot bushing puller (SST).

●

Removal and installation without the engine stand is possible.

PBIC0090E

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