Nissan Frontier D40. Instruction — part 591
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ENGINE UNIT
CAUTION:
Do not rotate crankshaft.
• Remove connecting rod cap and bearing, and using the scale on
the 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-79, "Disassembly and Assembly"
• Measure the inner diameter of main bearing with a bore gauge.
(Bearing oil clearance) = (Main bearing inner diameter) – (Crank-
shaft main journal diameter)
• If the clearance exceeds the limit, select proper main bearing according to main bearing inner diameter and
crankshaft main journal diameter to obtain the specified bearing oil clearance. Refer to
.
Method of Using Plastigage
• Remove engine oil and dust on crankshaft main journal and the surfaces of each bearing completely.
• Cut a 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-79, "Disassembly and Assembly"
CAUTION:
Do not rotate crankshaft.
• Remove lower cylinder block and bearings, and using the scale on
the 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 CRUSH HEIGHT
PBIC1149E
Standard:
No. 1, 3 and 5 journals
: 0.028 - 0.042 mm (0.0011 - 0.0017 in)
No. 2 and 4 journals
: 0.041 - 0.056 mm (0.0016 - 0.0022 in)
Limit
: 0.1 mm (0.004 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-79, "Disassembly and Assembly"
the tightening procedure.
• If the standard is not met, replace main bearings.
CONNECTING ROD BEARING CRUSH HEIGHT
• 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
for the tightening procedure.
• If the standard is not met, replace connecting rod bearings.
LOWER CYLINDER BLOCK MOUNTING BOLT OUTER DIAMETER
• Perform only with M10 bolts.
• 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 (a large difference in dimensions), replace
lower cylinder block bolt with a new one.
CONNECTING ROD BOLT OUTER DIAMETER
• Measure the outer diameter (d) at position as shown.
• If reduction appears in a position other than (d), regard it as (d).
• When (d) falls below the limit (when it becomes thinner), replace
connecting rod bolt 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.
Standard: There must be crush height.
SEM502G
Standard: There must be crush height.
PBIC1646E
Limit [(d
1)
– (d
2
)]: 0.13 mm (0.0051 in)
PBIC0911E
Limit: 7.75 mm (0.3051 in)
PBIC0912E
Standard
: 1.3 mm (0.051 in) or less
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ENGINE UNIT
• 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.
Standard: 44.3 mm (1.744 in) or less.
PBIC1263E
PBIC2938E
HOW TO SELECT PISTON AND BEARING
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HOW TO SELECT PISTON AND BEARING
How to Select Piston and Bearing
INFOID:0000000005274300
DESCRIPTION
*For the service parts, the grade for fitting cannot be selected between piston pin and connecting rod. (Only grade “0” 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, follow the applicable procedures.
HOW TO SELECT PISTON
When New Cylinder Block Is Used
• Check the cylinder bore grade on rear-left side of cylinder block,
and select piston of the same grade.
• If there is a corrected stamp mark on cylinder block, use it as a cor-
rect reference.
When Cylinder Block Is Reused
Selection points
Selection parts
Selection items
Selection methods
Between cylinder block and
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 and con-
necting rod
Connecting rod bearing
Connecting rod bearing grade
(bearing thickness)
Combining service grades for
connecting rod big end diame-
ter and crankshaft pin outer di-
ameter determine connecting
rod bearing selection.
Between cylinder block and pis-
ton
Piston and piston pin assembly
(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 and connecting
rod
*
—
—
—
SBIA0283E
PBIC3019E
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