Infiniti Q45 (FY33). Manual — part 508
NVH Troubleshooting Chart
Use the chart below to help you find the cause of the symptom. If necessary, repair or replace these parts.
Reference page
—
—
—
PD-8
PD-18
PD-26
—
Refer
to
Refer
to
PROPELLER
SHAFT
in
this
chart.
Refer
to
DIFFERENTIAL
in
this
chart.
Refer
to
and
Refer
to
Refer
to
F
A
section.
Refer
to
RA
section.
Refer
to
BR
section.
Refer
to
Possible cause and
SUSPECTED PARTS
Uneven
rotation
torque
Center
bearing
improper
installation
Excessive
center
bearing
axial
end
play
Center
bearing
mounting
(insulator)
cracks,
damage
or
deterioration
Excessive
joint
angle
Rotation
imbalance
Excessive
runout
Rough
gear
tooth
Improper
gear
contact
T
ooth
surfaces
worn
Incorrect
backlash
Companion
flange
excessive
runout
Improper
gear
oil
PROPELLER
SHAFT
DIFFERENTIAL
AXLE
AND
SUSPENSION
TIRES
ROAD
WHEEL
DRIVE
SHAFT
BRAKES
STEERING
Symptom
PRO-
PELLER
SHAFT
Noise
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Shake
X
X
X
X
X
X
X
X
Vibration
X
X
X
X
X
X
X
X
X
X
X
DIFFER-
ENTIAL
Noise
X
X
X
X
X
X
X
X
X
X
X
X
X
X: Applicable
GI
MA
EM
LC
EC
FE
AT
FA
RA
BR
ST
RS
BT
HA
EL
IDX
NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING
PD-5
SPD377A
SPD053A
On-vehicle Service
PROPELLER SHAFT VIBRATION
If vibration is present at high speed, check mounting between pro-
peller shaft and companion flange.
Make sure alignment marks A and B are located as close to
each other as possible.
If not, change mounting as indicated in “Installation”.
APPEARANCE CHECKING
I
Inspect propeller shaft tube surface for dents or cracks.
If damaged, replace propeller shaft assembly.
I
If center bearing is noisy or damaged, replace center bearing.
Removal
When removing the propeller shaft from the vehicle, confirm
the alignment mark on the bolt head before removal. Also,
when installing the propeller shaft, be sure to use new bolts
and make sure the alignment marks on the bolt heads are in
the same position as before removal.
If propeller shaft is replaced with a new one, replace all bolts
with “9” bolts. Do not use “A”, “B” or “C” bolts.
PROPELLER SHAFT
PD-6
SPD378A
SPD359
I
Draw out propeller shaft from transmission and plug up rear
end of transmission rear extension housing.
SPD053A
Installation
If companion flange has been removed, put new alignment marks
B and C on it. Then reassemble using the following procedure.
(Perform step 4 when final drive and propeller shaft are separated
from each other. Also perform step 4 when either of these parts is
replaced with a new one.)
SPD062A
1.
Erase original marks B and C from companion flange with
suitable solvent.
2.
Mark (B)
a.
Measure companion flange vertical runout.
b.
Determine the position where maximum runout is read on dial
gauge. Put mark (shown by B in figure at left) on flange perim-
eter corresponding to maximum runout position.
SPD063A
3.
Mark (C)
a.
Measure companion flange surface runout.
b.
Determine the position where maximum runout is read on dial
gauge. Put mark (shown by C in figure at left) on flange perim-
eter corresponding to maximum runout position.
GI
MA
EM
LC
EC
FE
AT
FA
RA
BR
ST
RS
BT
HA
EL
IDX
PROPELLER SHAFT
Removal (Cont’d)
PD-7
SPD061A
4.
Position companion flange and propeller shaft using alignment
marks A and B. Set the marks A and B as close to each other
as possible. Temporarily attach bolts and nuts.
5.
Press down propeller shaft with alignment mark C facing
upward. Then tighten the lower nut to specified torque.
6.
Tighten remaining nuts to specified torque.
SPD139AB
CENTER BEARING BRACKET INSTALLATION
I
Position the bearing cushion overlap as illustrated at left.
SPD106
Inspection
I
Inspect propeller shaft runout. If runout exceeds specifications,
replace propeller shaft assembly.
Runout limit: 0.6 mm (0.024 in)
SPD874
I
Inspect journal axial play.
If the play exceeds specifications, replace propeller shaft
assembly.
Journal axial play:
0 mm (0 in)
SPD109-A
Disassembly
CENTER BEARING
1.
Put matchmarks on flanges, and separate 2nd tube from 1st
tube.
PROPELLER SHAFT
Installation (Cont’d)
PD-8
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