Maserati Technical Bulletin
Date: November 29th, 2016
Bulletin No. MAS001052 – Rear Differential
Inspection_US
Recall Campaign ‐ 328
Supersedes: N/A
Model: Quattroporte (M156) and Ghibli (M157)
Model Year: 2017
Subject: Vehicle Safety Recall Campaign 328 – Rear Differential Inspection
MASERATI SAFETY RECALL BULLETIN
PERFORM THE PROCEDURE OUTLINED IN THIS TECHNICAL BULLETIN ON ALL
AFFECTED NEW VEHICLES BEFORE CUSTOMER DELIVERY OR FOR VEHICLES
ALREADY SOLD AND DELIVERED THE NEXT TIME THE VEHICLE IS IN THE SHOP FOR
MAINTENANCE OR REPAIRS.
Maserati dealers must ensure recalls are completed after having been notified by
Maserati North America, Inc. (MNA) that a safety-related defect or noncompliance exists
in any motor vehicle or item of replacement equipment in the dealer’s possession at the
time of notification. In MNA's case, this notification would typically be made by the
issuance of a recall notification in the form of a Technical Bulletin.
Under the National Traffic and Motor Vehicle Safety Act of 1966, as amended, if a recall
campaign is announced by MNA, dealers must ensure that all recalls on new vehicles
and new items of replacement equipment are completed BEFORE delivery to the
consumer. This means that dealers may not legally deliver new motor vehicles or new
items of replacement equipment to consumers with an open recall.
The Safety Act also prohibits dealers from selling or leasing the motor vehicle or item of
replacement equipment, unless and until the open recall has been completed BEFORE
delivery. This also pertains to vehicles in the Certified Pre-Owned program, and to items
of replacement equipment.
Finally, MNA dealers should not sell or use parts that have been recalled by MNA. Please
follow the specific instructions provided by MNA on the return or disposition of any
parts.
© 2016 Maserati North America, Inc.
AfterSales
www.maseratiusa.com
All rights reserved. Reproduction or translation
in whole or in part is not permitted without
authorization from the publisher. Printed in USA
Description of Vehicle Safety Recall 328
Maserati S.p.A. and MNA have determined that the above described vehicles were
manufactured with a rear differential unit pinion nut that was not torqued correctly. The function
of the pinion nut is to provide the axial force required for proper location of the pinion within the
differential unit bearing assemblies. A loose pinion nut will result in a reduction or total loss of
axial force, as well as, insufficient orientation of the pinion itself. A loose pinion nut will
potentially have an adverse effect on noise, vibration and harshness (NVH) performance,
reduced gear, and bearing life, and can cause a differential fluid leak at the pinion seal. In the
most severe cases of a loose pinion nut, axial loads could force the pinion into a differential gear
binding condition, which can result in blocking the rotation of the ring gear, and potentially
locking the rear wheels, thereby increasing the risk of a vehicle crash.
Which Vehicles Are Affected
Please refer to ModisCS+ and the attached VIN list at the end of this bulletin for the
affected vehicles in the U.S.
Vehicle Remedy Information
1. Check that the vehicle is included in this Recall campaign, and that this repair
has not been previously performed.
2. Inspect the rear differential pinion nut torque. If a replacement differential is
needed, see attachment “A” at the end of this bulletin.
3. The recall procedure is now complete.
This repair procedure will be performed free of charge to the customer.
Parts Needed For The Recall
For this Recall campaign, the rear differential P/N: 670039125 (if needed), must be
ordered from the Maserati Parts Department.
MAS001052_Recall_328_Rear_Differential_Inspection
2
OPERATING PROC
CEDURE
E
1. Drive
D
the vehicle on to a lift.
S the park
king brake to lock the rear
r
wheelss.
2. Set
3. Disengage
D
the
t
gearbo
ox parking lock releasse by pullin
ng the cab
ble as show
wn in
section 03.0
02.018 – 02
2 of the Wo
orkshop Ma
anual and be
elow in Fig.1.
Fig.1
D
the battery (08.20.001
1 – 02 of the
e Workshop Manual).
4. Disconnect
5. Lift
L the vehic
cle.
6. Remove
R
the
e r/s and l/s exhaust ta
ailpipes as sshown belo
ow and in se
ection
01.81.004
0
– 00 and 01.81.005 – 00
0 of the W
Workshop Ma
anual.
a. Remove
e the space
er bar (Fig.2
2)
Fig.2
st clamps (N
Num.1, in F
Fig.3)
b. Loosen the exhaus
Fig
g.3
Fig.4
c. Remove
e the vacum
me hose fro
om the exha
aust change
e-over valvve (Fig.4)
MAS0010
052_Recall_3
328_Rear_Diffferential_Inspection
3
d. Remove
e the hange
er bolt from the front o
of the silenccer (Fig.5)
Fig.5
5
Fig.6
e. Slide the pipe brac
cket out of the
t vibration
n dampene
er (Fig.6)
f. Remove
e the hanger bolt from the rear of the silence
er (Fig.7)
Fig.7
g. Repeat the above procedures
s (Fig’s. 3 th
hru 7) to re
emove the o
other silenccer
7. Remove
R
the
e three scre
ews (red arrrows) and t hen remove
e the heat sshield off of the
rear
r
differen
ntial (1 in Fig.8).
Fig.8
MAS0010
052_Recall_3
328_Rear_Diffferential_Inspection
4
8. Using a marrker, make a reference
e mark possition (Red line, Fig.9 and 9a) on
n the
differential flange
f
(1), the drive shaft
s
and t he mass d
dampener ((2). Then m
make
cing nuts (ffor re-assem
mbly). Rem
move the 6 bolts
notes of the position off the balanc
astening the
e drive shafft to the diffferential.
fa
Reference
Mark
Fig.9
Fig.9a
9. Remove
R
the
e driveshaft from the differential a
and supportt it on a hyd
draulic lift as
shown in Fig
g.10
Fig.10
10. With
W a marker, draw a line from one
o side of the lock nu
ut to the oth
her side as
shown
s
in Fig.11. Take
e a picture of
o the nut b
before moving to the ne
ext step.
Fig.11
MAS0010
052_Recall_3
328_Rear_Diffferential_Inspection
5
11. With a calibrated torque wrench, tighten the lock nut to 245 Nm. (Fig.12)
NOTE: Make sure the axles / wheels do not turn during this stage.
Fig.12
12. Perform a visual inspection of the nut to make sure it has not moved (Fig.13).
Compare it with the picture taken in step 10. If there was any movement of the
nut, the differential must be replaced. Refer to section 3.21.001 – 00 of the
Workshop Manual and attachment “A” in this bulletin.
Fig.13
NOTE: Only perform step 13 if the nut moved and the differential has to be
replaced.
13. Perform a visual inspection of the drive shaft cover to make sure there are no
bumps or protrusions that may alter the smoothness of the cover (Fig.14).
If any bumps or protrusions are found, the drive shaft must be replaced.
If replacing the drive shaft, refer to section 3.30.001 of the Workshop Manual.
Fig.14
MAS001052_Recall_328_Rear_Differential_Inspection
6
14. Reassemb
bly - after In
nspection only. (No pa
arts replace
ed.)
a. Re-insta
all the drive shaft making sure the
e reference mark made
e in Fig. 9 is
aligned with
w the driv
ve shaft, the mass dam
mpener and
d the differe
ential. (Fig
g.15)
Reference Mark
Fig.15
b. Install th
he drive sha
aft bolts in their origina
al positions and torque
e to
30 Nm (+
+ 90°).
all all of the parts previously remo
oved.
c. Re-insta
En
ntering A Warrantty Claim
Complette the warra
anty claim as
a follows:
CampaignN
C
umber
328
24
Warranty
W
Co
ode
Defect
D
Code
e
063
Code
Component
C
3.2
21.001
Operation
O
Code
C
for Ins
spection onlly
3.21.001.9 (1.1h)
Operation
O
Code
C
for Ins
spection and
d Replacem
ment Differe
ential 3.21
1.001.8 (2.1
1h)
Operation
O
Code
C
for In
nspection and
a
Replaccement Diffferential a
and Drive shaft
3.21.001.7 (2.7h)
Component
C
Se
ee Parts se
ection
Code
MAS0010
052_Recall_3
328_Rear_Diffferential_Inspection
7
Attachment “A”
(Replacing the Differential)
1. Replacing the rear differential
a. Position a lift and place a block between the lift and differential. (Fig.1)
Fig.1
Fig.2
b. Using special tool p/n: 900000226 (Fig.2), remove the fastening bolts from
the chassis to the differential. (Fig.3 and Fig.4)
Fig.3
Fig.4
c. Remove the lower bolt from the differential to the rear frame. (Fig.5)
Fig.5
MAS001052_Recall_328_Rear_Differential_Inspection
8
d. Lower the lift just enough so that you can carefully pry out the axles as shown
in Fig.6 and Fig.7.
Fig.6
Fig.7
e. Slowly lower the lift while at the same time removing the axles. (Fig’s. 8 and 9)
Fig.8
Fig.9
3. Installing the rear differential
a. Re-install all of the parts removed following the removal procedure in reverse
order.
b. Torque the lower bolt on the differential to the rear frame to 65 Nm. (Fig.10)
Fig.10
MAS001052_Recall_328_Rear_Differential_Inspection
9
c. Torque
T
the rear
r
fastening bolts (Fig.11 and F
Fig.12) betw
ween the differential an
nd
chassis to 190 Nm.
Fig.11
Fig.12
d. Place the drive shaftt in the diffe
erential flan
nge and alig
gn the referrence markss
made durring remova
al (Fig.13 an
nd 13a) alo
ong with the
e mark on the new
differentia
al (Num. 1 in Fig.13a) and the ma
ass dampen
ner. (Num.2
2 in Fig.13a
a)
Reference
Mark
Fig.13
Fig.13a
e. Install th
he drive sha
aft bolts in their origina
al positions and torque
e to
30 Nm (+
+ 90°). (Fig
g.14)
Fig.14
4
c. Re-insta
all rest of th
he parts pre
eviously rem
moved.
d. After roa
ad testing, if any vibra
ations are observed, ba
alance the drive shaft.
e. To balance the driv
ve shaft, re
effer to Secttion 3.30.00
01-35 of the
e Workshop
p
Manual.
MAS0010
052_Recall_3
328_Rear_Diffferential_Inspection
10
VIN
N List U.S.
MAS0010
052_Recall_3
328_Rear_Diffferential_Inspection
11