Infiniti FX35, FX50 (S51). Manual - part 991

EM-264

< UNIT DISASSEMBLY AND ASSEMBLY >

[VK50VE]

CYLINDER BLOCK

• Be sure that front mark (H) on connecting rod bearing cap is facing the front of the engine.

16. Tighten connecting rod bolts as per the following:
a.

Inspect the outer diameter of connecting rod bolt. Refer to 

EM-265, "Inspection"

.

b.

Apply engine oil to the threads and seats of connecting rod bolts. 

c.

Tighten connecting rod bolts.

d.

Completely loosen connecting rod bolts.

e.

Tighten connecting rod bolts.

f.

Tighten connecting rod bolts. (clockwise)

CAUTION:

Always use the angle wrench [SST: KV10112100 (BT8653-A)]. Never make judgment by visual
inspection.
• After tightening connecting rod bolts, check that crankshaft rotates smoothly.
• Check the connecting rod side clearance. Refer to 

EM-265, "Inspection"

.

17. Install knock sensors.

• Install knock sensors in the direction shown in the figure.

• After installing knock sensor, connect harness connector, and

lay it out to front of the engine.

CAUTION:

• Never tighten mounting bolts while holding connector.   
• If any impact by dropping is applied to knock sensor,

replace it with new one.

NOTE:
• Check that there is no foreign material on the cylinder block

mating surface and the back surface of knock sensor. 

• Check that knock sensor does not interfere with other parts.

18. Install oil filter (for VVEL ladder assembly).

19. Install drive plate.

• Install drive plate (4) and reinforcement plate (3) as shown in

the figure.

• When installing drive plate to crankshaft (1), be sure to cor-

rectly align crankshaft side dowel pin and drive plate side
dowel pin hole.

CAUTION:

If these are not aligned correctly, engine runs roughly and
“MIL” illuminates.

• Holding ring gear with the ring gear stopper [SST: KV10119200 (J-49277)].
• Tighten the mounting bolts crosswise over several times.

20. Assemble in the reverse order of disassembly.

: 28.4 N·m (2.9 kg-m, 21 ft-lb)

: 0 N·m (0 kg-m, 0 ft-lb)

: 24.5 N·m (2.5 kg-m, 18 ft-lb)

Angle tightening: 90 degrees

: Engine front

2

: Pilot converter

A

: Rounded

: Engine front

JPBIA2274ZZ

JPBIA2275ZZ

CYLINDER BLOCK

EM-265

< UNIT DISASSEMBLY AND ASSEMBLY >

[VK50VE]

C

D

E

F

G

H

I

J

K

L

M

A

EM

N

P

O

Inspection

INFOID:0000000005245261

CRANKSHAFT END PLAY

• Measure the clearance between thrust bearings and crankshaft

arm when crankshaft is moved fully forward or backward with a dial
indicator (A).

• If the measured value exceeds the limit, replace thrust bearings,

and measure again. If it still exceeds the limit, replace crankshaft
also.

CONNECTING ROD SIDE CLEARANCE

• Measure the side clearance between connecting rod and crank-

shaft arm with a feeler gauge (A).

• If the measured value exceeds the limit, replace connecting rod,

and measure again. If it still exceeds the limit, replace crankshaft
also.

PISTON TO PISTON PIN OIL CLEARANCE

Piston Pin Hole Diameter

Measure the inner diameter of piston pin hole with an inside
micrometer (A).

Piston Pin Outer Diameter

Measure the outer diameter of piston pin with a micrometer (A).

Piston to Piston Pin Oil Clearance

(Piston to piston pin oil clearance) = (Piston pin hole diameter) – (Piston pin outer diameter)

Standard and limit

: Refer to 

EM-287, "Cylinder Block"

.

JPBIA2477ZZ

Standard and limit

: Refer to 

EM-287, "Cylinder Block"

.

JPBIA2476ZZ

Standard

: Refer to 

EM-287, "Cylinder Block"

.

JPBIA0217ZZ

Standard

: Refer to 

EM-287, "Cylinder Block"

.

JPBIA0218ZZ

Standard

: Refer to 

EM-287, "Cylinder Block"

.

EM-266

< UNIT DISASSEMBLY AND ASSEMBLY >

[VK50VE]

CYLINDER BLOCK

• If the calculated value is out of the standard, replace piston and piston pin assembly.
• When replacing piston and piston pin assembly, refer to 

EM-274, "Description"

.

NOTE:
Piston is available together with piston pin as assembly.

PISTON RING SIDE CLEARANCE

• Measure the side clearance of piston ring (1) and piston ring

groove with a feeler gauge (C).

• If the measured value exceeds the limit, replace piston ring, and

measure again. If it still exceeds the limit, replace piston also.

PISTON RING END GAP

• Check that the cylinder bore inner diameter is within the specifica-

tion.

• Lubricate with new engine oil to piston (1) and piston ring (2), and

then insert piston ring until middle of cylinder with piston, and mea-
sure the piston ring end gap with a feeler gauge (B).

• If the measured value exceeds the limit, replace piston ring, and

measure again. If it still exceeds the limit, re-bore cylinder and use
oversize piston and piston rings.

CONNECTING ROD BEND AND TORSION

• Check with a connecting rod aligner.

• If it exceeds the limit, replace connecting rod assembly.

CONNECTING ROD BIG END DIAMETER

A

:  OK

B

:  NG

Standard and limit

: Refer to 

EM-287, "Cylinder Block"

.

JPBIA2276ZZ

A

: Press-fit

Standard and limit

: Refer to 

EM-287, "Cylinder Block"

.

JPBIA2277ZZ

A

:  Bend

B

:  Torsion

C

: Feeler gauge

Bend limit 

: Refer to 

EM-287, 

"Cylinder Block"

.

Torsion limit

JPBIA0221ZZ

CYLINDER BLOCK

EM-267

< UNIT DISASSEMBLY AND ASSEMBLY >

[VK50VE]

C

D

E

F

G

H

I

J

K

L

M

A

EM

N

P

O

• Install connecting rod bearing cap without installing connecting rod

bearing, and tighten connecting rod bolts to the specified torque.
Refer to 

EM-256, "Disassembly and Assembly"

 for the tightening

procedure.

• Measure the inner diameter of connecting rod big end with an

inside micrometer.

• If out of the standard, replace connecting rod assembly.

CONNECTING ROD BUSHING OIL CLEARANCE

Connecting Rod Bushing Inner Diameter

Measure the inner diameter of connecting rod bushing with an inside
micrometer (A).

Piston Pin Outer Diameter

Measure the outer diameter of piston pin with a micrometer (A).

Connecting Rod Bushing Oil Clearance

(Connecting rod bushing oil clearance) = (Connecting rod bushing inner diameter) – (Piston pin outer diame-
ter)

• If the calculated value exceeds the limit, replace connecting rod assembly and/or piston and piston pin

assembly.

• If replacing piston and piston pin assembly, refer to 

EM-274, "Description"

.

• If replacing connecting rod assembly, refer to 

EM-275, "Connecting Rod Bearing"

 to select the connecting

rod bearing.

CYLINDER BLOCK DISTORTION

• Using a scraper, remove gasket on the cylinder block surface, and also remove engine oil, scale, carbon, or

other contamination. 

CAUTION:

Be careful not to allow gasket flakes to enter engine oil or engine coolant passages.

1

: Connecting rod

Standard

: Refer to 

EM-287, "Cylinder Block"

.

JPBIA0222ZZ

Standard

: Refer to 

EM-287, "Cylinder Block"

.

JPBIA0223ZZ

Standard

: Refer to 

EM-287, "Cylinder Block"

.

JPBIA0218ZZ

Standard and limit

: Refer to 

EM-287, "Cylinder Block"

.