Nissan Xterra. Manual - part 373

EM-120

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ENGINE UNIT

Method of Using Plastigage

• Remove oil and dust on crankshaft pin journal and the surfaces of each bearing completely. 

• Cut plastigage slightly shorter than the bearing width, and place it in crankshaft axial direction, avoiding oil

holes.

• Install connecting rod bearings to connecting rod and cap, and tighten connecting rod bolts to the specified

torque. Refer to 

EM-103, "Disassembly and Assembly"

 for the tightening procedure.

CAUTION:

Do not rotate crankshaft.

• Remove connecting rod bearing cap and bearing, and using scale

on plastigage bag, measure the plastigage width.

NOTE:

The procedure when the measured value exceeds the limit is

same as that described in the “Method by Calculation”.

MAIN BEARING OIL CLEARANCE

Method by Calculation

• Install main bearings to cylinder block and lower cylinder block,

and tighten lower cylinder block bolts to the specified torque. Refer

to 

EM-103, "Disassembly and Assembly"

 for the tightening proce-

dure.

• Measure the inner diameter of main bearing with bore gauge.

(Bearing clearance) = (Main bearing inner diameter) – (Crankshaft

main journal diameter)

• If the calculated value exceeds the limit, select proper main bearing according to main bearing inner diame-

ter and crankshaft main journal diameter to obtain specified bearing oil clearance. Refer to 

EM-125, "How to

Select Piston and Bearing"

.

Method of Using Plastigage

• Remove engine oil and dust on crankshaft main journal and the surfaces of each bearing completely.

• Cut plastigage slightly shorter than the bearing width, and place it in crankshaft axial direction, avoiding oil

holes.

• Install main bearings to cylinder block and lower cylinder block, and tighten lower cylinder block bolts to the

specified torque. Refer to 

EM-103, "Disassembly and Assembly"

 for the tightening procedure.

CAUTION:

Do not rotate crankshaft.

• Remove lower cylinder block and bearings, and using scale on

plastigage bag, measure the plastigage width. 

NOTE:

The procedure when the measured value exceeds the limit is

same as that described in the “Method by Calculation”.

CRUSH HEIGHT OF MAIN BEARING

PBIC1149E

Standard

: 0.035 - 0.045 mm (0.0014 - 0.0018 in) 

(actual clearance)

Limit

: 0.065 mm (0.0026 in)

PBIC2204E

PBIC1149E

ENGINE UNIT

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• When lower cylinder block is removed after being tightened to the

specified torque with main bearings installed, the tip end of bearing

must protrude. Refer to 

EM-103, "Disassembly and Assembly"

 for

the tightening procedure.

• If the standard is not met, replace main bearings.

CRUSH HEIGHT OF CONNECTING ROD BEARING

• When connecting rod bearing cap is removed after being tightened

to the specified torque with connecting rod bearings installed, the

tip end of bearing must protrude. Refer to 

EM-103, "Disassembly

and Assembly"

 for the tightening procedure.

• If the standard is not met, replace connecting rod bearings.

LOWER CYLINDER BLOCK BOLT OUTER DIAMETER

• Measure the outer diameters [(d

1)

, (d

2

)] at two positions as shown.

• If reduction appears in (A) range, regard it as (d

2)

.

• If it exceeds the limit (large difference in dimensions), replace

lower cylinder block bolt with new one.

CONNECTING ROD BOLT OUTER DIAMETER

• Measure the outer diameter (d) at position shown.

• If the reduction appears in a position other than (d), regard it as (d).

• When (d) exceeds the limit (when it becomes thinner), replace

connecting rod bolt with new one.

FLYWHEEL RUNOUT (M/T MODELS)

NOTE:

• This inspection is for double mass flywheel only.

• Do not disassemble the double mass flywheel.

Flywheel Deflection

Standard

: There must be crush height.

SEM502G

Standard

: There must be crush height.

PBIC1646E

Limit [(d

1)

 – (d

2

)]

: 0.11 mm (0.0051 in)

PBIC0911E

Limit

: 7.75 mm (0.3051 in)

PBIC0912E

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ENGINE UNIT

• Measure the deflection of the flywheel contact surface to the clutch

with a dial gauge.

• Measure the runout at 210 mm (8.27 in) diameter.

• When measured value exceeds the limit, replace the flywheel with

a new one.

MOVEMENT AMOUNT OF FLYWHEEL (M/T MODELS)

CAUTION:

Do not disassemble double mass flywheel.

Movement Amount of Thrust (Fore-and-Aft) Direction

• Measure the movement amount of thrust (fore-and-aft) direction when 100 N (10.2 kg, 22 lb) force is added

at the portion of 125 mm (4.92 in) radius from the center of flywheel.

• If measured value is out of the standard, replace flywheel.

Movement Amount in Radial (Rotation) Direction

Check the movement amount of radial (rotation) direction with the following procedure:
1. Install a bolt to clutch cover mounting hole, and place a torque wrench on the extended line of the flywheel

center line.

• Tighten bolt at a force of 9.8 N·m (1.0 kg-m, 87 in-lb) to keep it from loosening.

2. Put a mating mark on circumferences of the two flywheel

masses without applying any load (Measurement standard

points).

3. Apply a force of 9.8 N·m (1.0 kg-m, 87 in-lb) in each direction,

and mark the movement amount on the mass on the transmis-

sion side.

4. Measure the dimensions of movement amounts (A) and (B) on

circumference of flywheel on the transmission side.

• If measured value is out of the standard, replace flywheel.

DRIVE PLATE (A/T MODELS)

• Check drive plate and signal plate for deformation or cracks.

CAUTION:

• Do not disassemble drive plate.

• Do not place drive plate with signal plate facing down.

• When handling signal plate, take care not to damage or

scratch it. 

• Handle signal plate in a manner that prevents it from becom-

ing magnetized.

• If anything is found, replace drive plate.

OIL JET

• Check nozzle for deformation and damage.

• Blow compressed air from nozzle, and check for clogs.

• If it is not satisfied, clean or replace oil jet.

OIL JET RELIEF VALVE

Limit

: 0.45 mm (0.0177 in) or less 

PBIC2168E

Standard

: 1.3 mm (0.051 in) or less

Standard: 44.3 mm (1.744 in) or less.

PBIC1263E

PBIC2938E

ENGINE UNIT

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• Using clean plastic stick, press check valve in oil jet relief valve.

Make sure that valve moves smoothly with proper reaction force.

• If it is not satisfied, replace oil jet relief valve.

Dowel Pin Alignment

INFOID:0000000009484494

REMOVAL

1. Use suitable tool to lock the drive plate (A/T models) or flywheel

(M/T models) and match mark (A) the drive plate or flywheel

before removing the bolts.

CAUTION:

Do not damage the ring gear teeth, or the signal plate teeth

behind the ring gear.

2. Remove drive plate (A/T models) or flywheel (M/T models).

• Loosen the drive plate or flywheel bolts in a diagonal order.

CAUTION:

• Do not place drive plate (A/T models) or flywheel (M/T

models) with signal plate facing down.

• When handling the signal plate, take care not to damage

or scratch it.

• Handle the signal plate in a manner that prevents it from

becoming magnetized

INSTALLATION (A/T MODELS)

1. Installation is in the reverse order of removal.

• When installing the drive plate to the crankshaft, use the

match mark (A) as shown to correctly align the crankshaft side

dowel pin to the drive plate side dowel pin hole.

EMU0468D

ALBIA0522ZZ

SEM760G

ALBIA0522ZZ