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Infiniti F50. Manual - part 548

CYLINDER BLOCK

EM-79

●

Install new oil seal in the direction shown in the figure.

Install rear oil seal retainer.

●

Apply liquid gasket thoroughly to rear oil seal retainer.
Use Genuine RTV Silicone Sealant or equivalent. Refer to

●

Apply new engine oil on lips of oil seal. Do not touch.

10. Install the piston to the connecting rod.

Using a snap ring pliers, install the snap ring to the grooves of
the piston rear side.

●

Insert it fully into groove to install.

Install the piston to the connecting rod.

●

Using an industrial drier or similar tool, heat the piston until the piston pin can be pushed in by hand
without excess force [approx. 60 to 70 C

(140 to 158

F)]. From the front to the rear, insert the piston

pin into the piston and the connecting rod.

●

Assemble so that the front mark on the piston crown and the
oil holes and the cylinder No. on the connecting rod are posi-
tioned as shown in the figure.

Install the snap rings to the front of the piston.

●

After installing, check that the connecting rod moves
smoothly.

11. Using a piston ring expander, install the piston rings.

CAUTION:

Be careful not to damage the piston.

●

Position each ring with the gap as shown in the figure, refer-
ring to the piston front mark.

●

Install the top ring and the second ring with the stamped sur-
face facing upward.

SEM715A

SBIA0391E

PBIC0099E

Stamped mark

: R (top ring)

: 2R (second ring)

PBIC0100E

EM-80

CYLINDER BLOCK

12. Install the connecting rod bearings to the connecting rod and the

connecting rod cap.

●

When installing the connecting rod 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 the connecting rod bearing stopper pro-
trusion with the notch of the connecting rod to install.

●

Check the oil holes on the connecting rod and those on the
corresponding bearing are aligned.

13. Install the piston and connecting rod assembly to the crankshaft.

●

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

●

Apply engine oil sufficiently to the cylinder bore, piston, and
crankshaft pin.

●

Match the cylinder position with the cylinder No. on the con-
necting rod to install.

●

Using a piston ring compressor, install the piston with the front
mark on the piston crown facing the front of the engine.

CAUTION:

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

14. Install the connecting rod cap.

●

Match the stamped cylinder number marks on the connecting
rod with those on the cylinder cap to install.

15. Tighten the connecting rod nuts as follows:

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

Tighten nuts to 13.7 to 15.7 N·m (1.4 to 1.6 kg-m, 10 to 12 ft-lb).

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

Then all nuts 60 to 65 degrees clockwise [target: 60 degrees]
(angle tightening).

CAUTION:

Always use either an angle wrench or protractor. Avoid
tightening based on visual check alone.

●

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

●

Check the connecting rod side clearance. Refer to

EM-88, "CONNECTING ROD SIDE CLEARANCE"

PBIC0101E

PBIC0102E

PBIC0103E

PBIC0104E

CYLINDER BLOCK

EM-81

16. Install knock sensor.

●

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

●

Install it with its connector facing the rear side.

●

Do not tighten the mounting bolts while holding the connector.

●

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

●

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

CAUTION:

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

17. Install followings in 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 figure.

●

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

●

Face chamfered or rounded edge side to crankshaft.

How to Select Piston and Bearing

EBS002MW

DESCRIPTION

PBIC0105E

PBIC0106E

PBIC0852E

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 journal
grade (outer diameter of jour-
nal)

Between crankshaft to connect-
ing rod

Connecting rod bearing

Connecting rod bearing grade
(bearing thickness)

Connecting rod bearing grade
= crankshaft pin grade (outer
diameter of pin). No grade
exists for inner diameter of con-
necting 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 outer
diameter)

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

*Between piston to connecting
rod

—

EM-82

CYLINDER BLOCK

*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
Piston Selective Fitting When New Cylinder Block is Used:

Check the cylinder bore grade on the rear upper side between cylin-
der block banks, and select the piston of the same grade.

When Cylinder Block is Reused:

Measure the cylinder block bore inner diameter.

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

Piston Selection Table

Unit: mm (in)

NOTE:

●

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

●

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

PBIC0108E

PBIC0109E

Grade number (Mark)

Inner diameter of cylinder bore

93.000-93.010 (3.6614-3.6618)

93.010-93.020 (3.6618-3.6622)

93.020-93.030 (3.6622-3.6626)

Outer diameter of piston

92.980-92.990 (3.6606-3.6610)

92.990-93.000 (3.6610-3.6614)

93.000-93.010 (3.6614-3.6618)

Content .. 546 547 548 549 ..