lock INFINITI QX4 2001 Factory Service Manual

SEM845E
2. Install main bearing cap and bearing beam to cylinder block.
Tighten all bolts in correct order.
3. Measure inner diameters ªAº of each main bearing.
AEM033
4. Measure outer diameters ªDmº of each crankshaft main jour-
nal.
5. Calculate main bearing clearance.
Main bearing clearance = A þ Dm
Standard: 0.035 - 0.045 mm (0.0014 - 0.0018 in)
Limit: 0.065 mm (0.0026 in)
IIf it exceeds the limit, replace bearing.
IIf clearance cannot be adjusted using any standard bearing
grade, grind crankshaft journal and use undersized bearing.
SEM964
a. When grinding crankshaft journal, confirm that ªLº dimension in
fillet roll is more than the specified limit.
ªLº: 0.1 mm (0.004 in)
b. Refer to SDS for grinding crankshaft and available service
parts.
SEM451G
6. If crankshaft or cylinder block is replaced with a new one,
select thickness of main bearings as follows:
a. Grade number of each cylinder block main journal is punched
on the respective cylinder block. These numbers are punched
in either Arabic or Alphabet. Refer to SDS, EM-81.
If measured diameter is out of grade punched, decide suitable
grade using table in SDS.
SEM452G
b. Grade number of each crankshaft main journal is punched on
the respective crankshaft. These numbers are punched in
either Arabic or Alphabet. Refer to SDS, EM-84.
If measured diameter is out of grade punched, decide suitable
grade using table in SDS.
c. Select main bearing with suitable thickness according to the
following table.
Refer to ªSDSº, EM-85, for available main bearings.
CYLINDER BLOCK
Inspection (Cont'd)
EM-68

SEM280G
AEM027
Connecting Rod Bearing (Big end)NBEM0027S08021. Install connecting rod bearing to connecting rod and cap.
2. Install connecting rod cap to connecting rod.
Tighten bolts to the specified torque.
3. Measure inner diameter ªCº of connecting rod.
AEM034
4. Measure outer diameter ªDpº of each crankshaft pin journal.
5. Calculate connecting rod bearing clearance.
Connecting rod bearing clearance=CþDp
Standard: 0.034 - 0.059 mm (0.0013 - 0.0023 in)
Limit: 0.070 mm (0.0028 in)
6. If it exceeds the limit, replace bearing.
7. If clearance cannot be adjusted within the standard of any
bearing, grind crankshaft journal and use undersized bearing.
Refer to ªBEARING CLEARANCE Ð Main bearingº, EM-67.
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CYLINDER BLOCK
Inspection (Cont'd)
EM-69

SEM452G
EM142
8. If crankshaft is replaced with a new one, select connecting rod
bearing according to the following table.
Connecting rod bearing grade number (Identification
color):
These numbers are punched in either Arabic or Roman numer-
als.
Crankshaft pin journal grade
numberConnecting rod bearing grade number
0 0 (Black)
1 1 (Brown)
2 2 (Green)
Method B (Using plastigage)
CAUTION:
IDo not turn crankshaft or connecting rod while plastigage
is being inserted.
IWhen bearing clearance exceeds the specified limit,
ensure that the proper bearing has been installed. If incor-
rect bearing clearance exists, use a thicker or undersized
main bearing to ensure specified clearance.
SEM673E
CONNECTING ROD BUSHING CLEARANCE (SMALL
END)
NBEM0027S091. Measure inner diameter ªCº of bushing.
2. Measure outer diameter ªDpº of piston pin.
3. Calculate connecting rod bushing clearance.
Connecting rod bushing clearance=CþDp
Standard: 0.005 - 0.017 mm (0.0002 - 0.0007 in)
Limit: 0.030 mm (0.0012 in)
If it exceeds the limit, replace connecting rod assembly or
connecting rod bushing and/or piston set with pin.
SEM849EB
SEM536G
DRIVE PLATE RUNOUTNBEM0027S11Runout (Total indicator reading):
Less than 0.15 mm (0.0059 in)
CAUTION:
IThe signal plate is built into the drive plate assembly. Be
careful not to damage the signal plate, especially the
teeth.
ICheck the drive plate and signal plate for deformation or
cracks.
IKeep any magnetized objects away from the signal plate.
IDo not allow any magnetic materials to contact the signal
plate teeth.
CYLINDER BLOCK
Inspection (Cont'd)
EM-70

SEM838F
AssemblyNBEM0028PISTONNBEM0028S011. Install new snap ring on one side of piston pin hole.
2. Heat piston to 60 to 70ÉC (140 to 158ÉF) and assemble piston,
piston pin, connecting rod and new snap ring.
IAlign the direction of piston and connecting rod.
INumbers stamped on connecting rod and cap correspond
to each cylinder.
IAfter assembly, make sure connecting rod swings
smoothly.
SEM453G
3. Set piston rings as shown.
CAUTION:
IWhen piston rings are not replaced, make sure that piston
rings are mounted in their original positions.
IWhen replacing piston rings, these without punchmarks,
present, piston rings can be mounted with either side up.
SEM160B
IAlign piston rings so that end gaps are positioned as
shown in the figure.
SEM454G
OIL JETNBEM0028S051. Install oil jets.
IInsert oil jet knock pin into the cylinder block knock pin hole,
and tighten the mounting bolts.
SEM175F
CRANKSHAFTNBEM0028S021. Set main bearings in their proper positions on cylinder block
and main bearing beam.
IConfirm that correct main bearings are used. Refer to
ªInspectionº of this section.
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CYLINDER BLOCK
Assembly
EM-71

SEM177F
SEM456G
2. Instructions for re-use of main bearing cap bolts.
IA plastic zone tightening method is used for tightening
main bearing cap bolts. Measure d1 and d2 as shown in
the figure.
d2: Select minimum diameter in the measuring area.
If the difference between d1 and d2 exceeds the limit,
replace the bolts with new ones.
Limit (d1 - d2): 0.11 mm (0.0043 in)
SEM851E
3. After installing crankshaft, main bearing cap, main bearing
beam and bearing cap bolts, tighten bearing cap bolts in
numerical order as shown.
IMake sure that the front mark on the main bearing beam
faces the front of the engine.
ITightening procedure
a)Tighten all bolts to 32 to 38 N´m (3.3 to 3.9 kg-m, 24 to 28
ft-lb).
b)Turn all bolts 90 to 95 degrees clockwise with angle
wrench.
IPrior to tightening bearing cap bolts, place bearing beam
in its proper position by shifting crankshaft in the axial
direction.
IAfter securing bearing cap bolts, make sure crankshaft
turns smoothly by hand.
ILubricate threads and seat surfaces of the bolts with new
engine oil.
SEM852E
4. Measure crankshaft end play.
Crankshaft end play:
Standard
0.10 - 0.25 mm (0.0039 - 0.0098 in)
Limit
0.30 mm (0.0118 in)
If beyond the limit, replace bearing with a new one.
CYLINDER BLOCK
Assembly (Cont'd)
EM-72

SEM455G
5. Install connecting rod bearings in connecting rods and con-
necting rod caps.
IConfirm that correct bearings are used.
SEM620
6. Install pistons with connecting rods.
a. Install them into corresponding cylinders with Tool.
IBe careful not to scratch cylinder wall with the connecting
rod.
IArrange so that front mark on piston head faces toward
engine front.
SEM457G
b. Install connecting rod caps.
ILubricate threads and seat surfaces with new engine oil.
IInstall so that the cylinder number stamped on the connecting
rod agrees with that stamped on cap side.
IMake sure that front mark on the connecting rod cap faces the
front of the engine.
SEM538G
SEM953E
c. Re-use connecting rod cap bolts as follows.
IMake sure that the bolts can be smoothly screwed-in to the
end manually.
IIf not, measure the outer diameter ªdº shown in the figure.
Outer diameter ªdº of connecting rod cap bolt:
Standard
7.90 - 8.00 mm (0.3110 - 0.3150 in)
Limit
7.75 mm (0.3051 in)
d. Tighten connecting rod cap bolts to the specified torque.
Connecting rod cap bolt:
(1) Tighten nuts to 19 to 21 N´m (1.9 to 2.1 kg-m, 14
to 15 ft-lb).
(2) Turn nuts 90 to 95 degrees clockwise with angle
wrench.
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CYLINDER BLOCK
Assembly (Cont'd)
EM-73

SEM954E
7. Measure connecting rod side clearance.
Connecting rod side clearance:
Standard
0.20 - 0.35 mm (0.0079 - 0.0138 in)
Limit
0.40 mm (0.0157 in)
If beyond the limit, replace connecting rod and/or crankshaft.
8. Install rear oil seal retainer.
SEM005G
REPLACEMENT OF PILOT CONVERTERNBEM0028S041. Remove pilot converter using tool or suitable tool.
SEM537E
2. Install pilot converter as shown.
SEM539G
DRIVE PLATENBEM0028S06Install drive plate.
IInstall the drive plate and reinforce plate in the direction shown
in the figure.
ISecure the crankshaft using a ring gear stopper.
ITighten the installation bolts crosswise over several times.
CYLINDER BLOCK
Assembly (Cont'd)
EM-74

EM671
Cam height ªAº Intake and exhaust 44.465 - 44.655 (1.7506 - 1.7581)
Wear limit of cam height 0.2 (0.008)
Valve timing
Unit: degree
abcde f
232 230 ±3 53 6 46
Cylinder BlockNBEM0035Unit: mm (in)
SEM022EA
Surface flatnessStandardLess than 0.03 (0.0012)
Limit0.10 (0.0039)
Cylinder bore Inner diameterStandardGrade No. 1 95.500 - 95.510 (3.7598 - 3.7602)
Grade No. 2 95.510 - 95.520 (3.7602 - 3.7606)
Grade No. 3 95.520 - 95.530 (3.7606 - 3.7610)
Wear limit 0.20 (0.0079)
Out-of-round (X þ Y)Less than 0.015 (0.0006)
Taper (AþBþC)Less than 0.015 (0.0006)
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SERVICE DATA AND SPECIFICATIONS (SDS)
Camshaft and Camshaft Bearing (Cont'd)
EM-81

Main journal inner
diameter grade
(Without bearing)Grade No. A
Grade No. B
Grade No. C
Grade No. D
Grade No. E
Grade No. F
Grade No. G
Grade No. H
Grade No. J
Grade No. K
Grade No. L
Grade No. M
Grade No. N
Grade No. P
Grade No. R
Grade No. S
Grade No. T
Grade No. U
Grade No. V
Grade No. W
Grade No. X
Grade No. Y
Grade No. 4
Grade No. 763.993 - 63.994 (2.5194 - 2.5194)
63.994 - 63.995 (2.5194 - 2.5195)
63.995 - 63.996 (2.5195 - 2.5195)
63.996 - 63.997 (2.5195 - 2.5196)
63.997 - 63.998 (2.5196 - 2.5196)
63.998 - 63.999 (2.5196 - 2.5196)
63.999 - 64.000 (2.5196 - 2.5197)
64.000 - 64.001 (2.5197 - 2.5197)
64.001 - 64.002 (2.5197 - 2.5198)
64.002 - 64.003 (2.5198 - 2.5198)
64.003 - 64.004 (2.5198 - 2.5198)
64.004 - 64.005 (2.5198 - 2.5199)
64.005 - 64.006 (2.5199 - 2.5199)
64.006 - 64.007 (2.5199 - 2.5200)
64.007 - 64.008 (2.5200 - 2.5200)
64.008 - 64.009 (2.5200 - 2.5200)
64.009 - 64.010 (2.5200 - 2.5201)
64.010 - 64.011 (2.5201 - 2.5201)
64.011 - 64.012 (2.5201 - 2.5202)
64.012 - 64.013 (2.5202 - 2.5202)
64.013 - 64.014 (2.5202 - 2.5202)
64.014 - 64.015 (2.5202 - 2.5203)
64.015 - 64.016 (2.5203 - 2.5203)
64.016 - 64.017 (2.5203 - 2.5203)
Difference in inner
diameter between
cylindersStandardLess than 0.03 (0.0012)
Piston, Piston Ring and Piston PinNBEM0036AVAILABLE PISTONNBEM0036S01Unit: mm (in)
SEM882E
Piston skirt diameter ªAº StandardGrade No. 1 95.480 - 95.490 (3.7590 - 3.7594)
Grade No. 2 95.490 - 95.500 (3.7594 - 3.7598)
Grade No. 3 95.500 - 95.510 (3.7598 - 3.7602)
0.20 (0.0079) oversize (Service) 95.680 - 95.710 (3.7669 - 3.7681)
ªaº dimension41.0 (1.614)
Piston pin hole diameterGrade No. 0 21.993 - 21.999 (0.8659 - 0.8661)
Grade No. 1 21.999 - 22.005 (0.8661 - 0.8663)
Piston clearance to cylinder block 0.010 - 0.030 (0.0004 - 0.0012)
SERVICE DATA AND SPECIFICATIONS (SDS)
Cylinder Block (Cont'd)
EM-82

Removal and InstallationNBFE0002CAUTION:
IWhen removing accelerator wire, make a mark to indicate lock nut's initial position.
ICheck that throttle valve opens fully when accelerator pedal is fully depressed. Also check that it
returns to idle position when pedal is released.
ICheck accelerator control parts for improper contact with any adjacent parts.
IWhen connecting accelerator wire, be careful not to twist or scratch its inner wire.
IRefer to EL-240, ªAUTOMATIC SPEED CONTROL DEVICEº for ASCD wire adjustment.
SFE635A
SEF793W
SFE249AE
Adjusting Accelerator WireNBFE00031. Remove the vacuum hose connected to the throttle opener.
2. Connect suitable vacuum hose to vacuum pump as shown left.
3. Apply vacuum [more than þ40.0 kPa (þ300 mmHg, þ11.81
inHg)] until the throttle drum becomes free from the rod of the
throttle opener.
Make sure that there is clearance between the throttle
drum and rod.
If NG, refer to EC-101, ªBasic Inspectionº.
If OK, go to following step.
4. Loosen lock nut.
5. Tighten accelerator adjusting nut until throttle drum starts to
move.
6. From that position, turn back adjusting nut 1.5 to 2 turns, and
secure lock nut.
7. Release vacuum from the throttle opener.
8. Remove vacuum pump and vacuum hose from the throttle
opener.
9. Reinstall the original vacuum hose to the throttle opener
securely.
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ACCELERATOR CONTROL SYSTEM
Removal and Installation
FE-3