Manufacturer: Maserati North America, Inc.
The rear differential unit pinion nut may not have been properly tightened, allowing the pinion nut to loosen.
A loose pinion gear may bind, possibly resulting in the rear wheels locking up and increasing the risk of a crash.
Maserati will notify owners, and dealers will inspect the rear differential unit pinion nut torque, and, as necessary, replace the rear differential unit, free of charge.
The recall is expected to begin in December 2016.
Owners may contact Maserati customer service at 1-201-510-2369.
Maserati's number for this recall is 328.
Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to www.safercar.gov.
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.
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
- Check that the vehicle is included in this Recall campaign, and that this repair has not been previously performed.
- Inspect the rear differential pinion nut torque. If a replacement differential is needed, see attachment “A” at the end of this bulletin.
- 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.
- Drive the vehicle on to a lift.
- Set the parking brake to lock the rear wheels.
- Disengage the gearbox parking lock release by pulling the cable as shown in section 02.018 – 02 of the Workshop Manual and below in Fig.1.
- Disconnect the battery (08.20.001 – 02 of the Workshop Manual).
- Lift the vehicle.
- Remove the r/s and l/s exhaust tailpipes as shown below and in section 81.004 – 00 and 01.81.005 – 00 of the Workshop Manual.
a. Remove the spacer bar (Fig.2)
b. Loosen the exhaust clamps (Num.1, in Fig.3)
c. Remove the vacume hose from the exhaust change-over valve (Fig.4)
d. Remove the hanger bolt from the front of the silencer (Fig.5)
e. Slide the pipe bracket out of the vibration dampener (Fig.6)
f. Remove the hanger bolt from the rear of the silencer (Fig.7)
g. Repeat the above procedures (Fig’s. 3 thru 7) to remove the other silencer
- Remove the three screws (red arrows) and then remove the heat shield off of the rear differential (1 in Fig.8).
- Using a marker, make a reference mark position (Red line, Fig.9 and 9a) on the differential flange (1), the drive shaft and the mass dampener (2). Then make notes of the position of the balancing nuts (for re-assembly). Remove the 6 bolts fastening the drive shaft to the differential.
- Remove the driveshaft from the differential and support it on a hydraulic lift as shown in Fig.10
- With a marker, draw a line from one side of the lock nut to the other side as shown in Fig.11. Take a picture of the nut before moving to the next step.
- 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.
- 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.
NOTE: Only perform step 13 if the nut moved and the differential has to be replaced.
- 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.
- Reassembly - after Inspection only. (No parts replaced.)
a. Re-install the drive shaft making sure the reference mark made in Fig. 9 is aligned with the drive shaft, the mass dampener and the differential. (Fig.15)
b. Install the drive shaft bolts in their original positions and torque to 30 Nm (+ 90°).
c. Re-install all of the parts previously removed.
Entering A Warranty Claim
Complete the warranty claim as follows:
||See Parts section|
(Replacing the Differential)
- Replacing the rear differential
a. Position a lift and place a block between the lift and differential. (Fig.1)
b. Using special tool p/n: 900000226 (Fig.2), remove the fastening bolts from the chassis to the differential. (Fig.3 and Fig.4)
c. Remove the lower bolt from the differential to the rear frame. (Fig.5)
d. Lower the lift just enough so that you can carefully pry out the axles as shown in Fig.6 and Fig.7.
e. Slowly lower the lift while at the same time removing the axles. (Fig’s. 8 and 9)
- Installing the rear differential
a. Re-install all of the parts removed following the removal procedure in reverse
b. Torque the lower bolt on the differential to the rear frame to 65 (Fig.10)
c. Torque the rear fastening bolts (Fig.11 and Fig.12) between the differential and chassis to 190
d. Place the drive shaft in the differential flange and align the reference marks made during removal (Fig.13 and 13a) along with the mark on the new differential (Num. 1 in Fig.13a) and the mass dampener. (Num.2 in Fig.13a)
e. Install the drive shaft bolts in their original positions and torque to 30 Nm (+ 90°). (Fig.14)
c. Re-install rest of the parts previously removed.
d. After road testing, if any vibrations are observed, balance the drive shaft.
e. To balance the drive shaft, reffer to Section 3.30.001-35 of the Workshop