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Infiniti Q45. Manual - part 569

CYLINDER BLOCK

EM-93

Put mating (with paint) on each nut and connecting rod cap, all in the same direction (when using a pro-
tractor).

Then all nuts 60 degrees clockwise (angle tightening).

CAUTION:

Always use either the angle wrench (SST) or protractor.
Avoid tightening based on visual check alone.

●

After tightening the nuts, make sure that crankshaft rotates
smoothly.

●

Check the connecting rod side clearance. Refer to

EM-100,

"CONNECTING ROD SIDE CLEARANCE"

16. Install knock sensor.

●

Install it with its connector facing the rear of engine.

●

Install the sub-harness with its shorter branch line to the right
bank.

CAUTION:

●

Do not tighten mounting bolts while holding connector.

●

If any impact by dropping is applied to knock sensor,
replace it with new one.

NOTE:

●

Make sure that there is no foreign material on the cylinder
block mating surface and the back surface of knock sensor.

●

Make sure that knock sensor does not interfere with other parts.

17. Install the following in the reverse order of removal.

18. Remove engine assembly from engine stand.

19. Install drive plate.

●

Align guide pin of crankshaft rear end with pin holes of each
parts to install.

●

Install drive plate, reinforcement plate and pilot converter (if
not installed in step 4) as shown in the figure.

●

Holding ring gear with the ring gear stopper (SST: J-45476).

●

Using drift of 33 mm (1.30 in) dia, push pilot converter into the
end.

●

Face pilot converter chamfered or rounded edge side to
crankshaft.

: 14.7 N·m (1.5 kg-m, 11 ft-lb)

PBIC0104E

PBIC0105E

PBIC2867E

PBIC1965E

EM-94

CYLINDER BLOCK

How to Select Piston and Bearing

NBS001P3

DESCRIPTION

*For the service parts, the grade for fitting cannot be selected between a piston pin and a connecting rod.
(Only “0” grade is available.) The information at the shipment from the plant is described as a reference.

●

The identification grade stamped on each part is the grade for the dimension measured in new condition.
This grade cannot apply to reused parts.

●

For reused or repaired parts, measure the dimension accurately. Determine the grade by comparing the
measurement with the values of each selection table.

●

For details of the measurement method of each part, the reuse standards, and the selection method of the
selective fitting parts, refer to the text.

HOW TO SELECT PISTON
When New Cylinder Block is Used:

Check the cylinder bore grade (“1”, “2” or “3”) on the rear upper side
between cylinder block banks, and select piston of the same grade.

NOTE:
Piston is available with piston pin as a set for the service part. (Only
“0” grade piston pin is available.)

When Cylinder Block is Reused:

Measure the cylinder block bore inner diameter. Refer to

EM-104, "Cylinder Bore Inner Diameter"

Connecting points

Connecting parts

Selection items

Selection methods

Between cylinder block to
crankshaft

Main bearing

Main bearing grade (bearing
thickness)

Determined by match of cylin-
der block bearing housing
grade (inner diameter of hous-
ing) and crankshaft main jour-
nal grade (outer diameter of
main journal)

Between crankshaft to connect-
ing rod

Connecting rod bearing

Connecting rod bearing grade
(bearing thickness)

Connecting rod bearing grade
= crankshaft pin journal (outer
diameter of pin journal). No
grade exists for inner diameter
of connecting rod large end.

Between cylinder block to pis-
ton

Piston and piston pin assembly.
The piston is available together
with piston pin as an assembly.

Piston grade (piston skirt diam-
eter)

Piston grade = cylinder bore
grade (inner diameter of bore)

*Between piston to connecting
rod

—

PBIC2371E

PBIC2372E

CYLINDER BLOCK

EM-95

Determine the bore grade by comparing the measurement with the values under the “Cylinder bore inner
diameter” of the “Piston Selection Table”. Select piston of the same grade.

Piston Selection Table

Unit: mm (in)

NOTE:

●

Piston is available together with piston pin as an assembly.

●

Piston pin (piston pin hole) grade is provided only for the parts installed at the plant. For the service parts,
no grades can be selected (Only “0” grade is available.).

●

No second grade mark is available on piston.

HOW TO SELECT CONNECTING ROD BEARING
When New Connecting Rod and Crankshaft are Used:

Check pin journal diameter grade (“0”, “1” or “2”) on front of crank-
shaft, and select connecting rod bearing of the same grade.

NOTE:
There is no grading for connecting rod big end.

When Crankshaft and Connecting Rod are Reused:

Measure the connecting rod big end diameter. Refer to

EM-102, "CONNECTING ROD BIG END DIAME-

TER"

Make sure that the connecting rod big end diameter is within the standard value.

Measure the crankshaft pin journal diameter. Refer to

EM-106, "CRANKSHAFT PIN JOURNAL DIAME-

TER"

Determine the grade of crankshaft pin diameter grade by corresponding to the measured dimension in
“Crankshaft pin journal diameter” column of “Connecting Rod Bearing Selection Table”.

Select connecting rod bearing of the same grade.

Connecting Rod Bearing Selection Table

Unit: mm (in)

Undersize Bearings Usage Guide

●

When the specified oil clearance is not obtained with standard size connecting rod bearings, use under-
size (US) bearings.

●

When using undersize bearings, measure the connecting rod bearing inner diameters with bearings
installed, and grind crankshaft pin so that the oil clearance satisfies the standard.

Grade number (Mark)

2 (or no mark)

Cylinder bore inner diameter

93.000-93.010 (3.6614-3.6618)

93.010-93.020 (3.6618-3.6622)

93.020-93.030 (3.6622-3.6626)

Piston skirt diameter

92.980-92.990 (3.6606-3.6610)

92.990-93.000 (3.6610-3.6614)

93.000-93.010 (3.6614-3.6618)

PBIC2374E

Connecting rod big end diameter

55.000 - 55.013 (2.1654 - 2.1659)

Crankshaft pin journal diameter

Grade (Mark)

Dimension (Bearing thickness range)

Bearing grade No.

Color

51.968 - 51.974 (2.0460 - 2.0462)

1.500 - 1.503 (0.0591 - 0.0592)

STD 0

No color

51.962 - 51.968 (2.0457 - 2.0460)

1.503 - 1.506 (0.0592 - 0.0593)

STD 1

Brown

51.956 - 51.962 (2.0455 - 2.0457)

1.506 - 1.509 (0.0593 - 0.0594)

STD 2

Green

EM-96

CYLINDER BLOCK

Bearing undersize table

Unit: mm (in)

CAUTION:

In grinding crankshaft pin journal to use undersize bearings, do
not damage the fillet R [1.5 mm (0.059 in)]

HOW TO SELECT MAIN BEARING
When New Cylinder Block and Crankshaft are Used:

“Main Bearings Selection Table” rows correspond to main bear-
ing housing grade on rear upper side between cylinder block
banks.

“Main Bearings Selection Table” columns correspond to main
journal diameter grade on front side of crankshaft.

Select main bearing grade at the point where selected row and column meat in “Main Bearings Selection
Table”.

CAUTION:

●

Initial clearance for No. 1, 5 journal and No. 2, 3, 4 journal is different. Use two different selection
table for each part.

●

No. 1, 5 journal and No. 2, 3, 4 journal have the same signs but different measures. Do not con-
fuse.

Apply sign at crossing in above step 3 to “Main Bearings Grade Table”.

NOTE:

●

“Main Bearings Grade Table” applies to all journals.

●

Service parts is available as a set of both upper and lower.

When Cylinder Block and Crankshaft are Reused:

Measure the cylinder block main bearing housing inner diameter and the crankshaft main journal diame-
ter. Refer to

EM-104, "MAIN BEARING HOUSING INNER DIAMETER"

and

EM-106, "CRANKSHAFT

MAIN JOURNAL DIAMETER"

Correspond the measured dimension in “Cylinder block main bearing housing inner diameter” row of
“Main Bearings Selection Table”.

Correspond the measured dimension in “Crankshaft main journal diameter” column of “Main Bearings
Selection Table”.

Size

Thickness

US 0.25 (0.0098)

1.626 - 1.634 (0.0640 - 0.0643)

PBIC2373E

PBIC2371E

PBIC2374E

Content .. 567 568 569 570 ..