MTB-153

SB-10053586-7778
Maserati Technical Bulletin
Date:
Bulletin No.:
Supersedes:
Section:
May 24, 2013
MTB_153
N/A
Suspension
Model Type: GranTurismo Convertible, Gran Turismo, Granturismo MC, Quattroporte
Model Year: All
Subject:
.
Heli-Coil Installation Procedure into Rear Hub Holder
DESCRIPTION
A new procedure has been developed to avoid unnecessary replacement of the rear hub holder
as a result of damage to the bolt hole threads. Refer to the illustrations below when performing
vehicle service requiring the removal of the car shock absorber. When threads (B) are found to
be damaged and/or unusable during removal of screw (A), the following helicoil installation
procedure will help avoid costly rear hub replacement.
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AfterSales
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in whole or in part is not permitted without
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Tools Needed

Special tool no.900000223 “Helicoil Insertion Centering Tool"


Drill bit diameter 14.50 mm with minimum useful length 110 mm;
Drill;
Sheet metal protection (approx. 100*100mm).
Heli-coil M 14x1.5; (commercially available e.g., HELICOIL PLUS BOLLHOFF)
– Length: 14 mm (or 1.0D);
– Material: X5CrNi18-10(AISI304); or X5CrNi17-7(AISI 302) – hardness
HV0.2425Min;
Tap for Heli-coil M14x1.5 – 6H;
Heli-coil insertion tool; (commercially available e.g., HELI-COIL PLUS BOLLHOFF)

27MM Combination Wrench

Channel Locks or equivalent

Bushing driver sized 13/16”-15/16” ( Suggesting Mac Tools # BD3142-9)




Thread repair kit (commercially available e.g., SPIRALOCK) including:
Professional insertion tool
Male for support threading
Heli-coil M 14x1.5.
MTB_153_HeliCoil_Repair
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IMPORTANT- Each dealer will receive the following tools automatically from MNA
Parts Operations:
Helicoil Insertion Centering Tool
900000223 X1
Power Coil Thread Repair Kit
2018249 X1
Drill Bit (14.5mm X 4 7/8 x 8 3/4)
2018250 X1
Note: Service is carried out directly on the vehicle. However, in order to make these instructions
easier to understand and follow, the hub holder has been placed on the bench.
Caution: Ensure to wear suitable eye protection.
Heli-Coil Installation Procedure
1. Remove metal ring (1) from rear hub holder unthreaded seat.
2. Using a clean cloth and a suitable degreaser, clean hub holder unthreaded seat (A).
3. Insert special tool No.900000223 “Helicoil Insertion Centering Tool” (1), without stop nut,
inside the unthreaded seat.
MTB_153_HeliCoil_Repair
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AfterSales
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All rights reserved. Reproduction or translation
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4. Install corresponding stop nut (2) onto the threading of special tool no.900000223 “Helicoil
Insertion Centering Tool” (1), until contact has been made with the hub.
5. Secure nut portion (1) using channel locks or other suitable wrench, then using a
27mm wrench, tighten nut (B). Do not over tighten this nut.
6. Using commercially available cutting oil, lubricate the seat of hub holder bolt hole (B).
7. Using a suitable drill, install the drill bit supplied and insert it in through the Heli-coil
Insertion Centering Tool No. 900000223 (1), until drill bit tip is fully contacting the bolt
hole (B) as shown in the illustration below.
MTB_153_HeliCoil_Repair
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8. Using commercially available cutting oil, lubricate the drill bit at the points indicated (red
arrows) in the illustration below.
9. Place metal protection plate (1) between hub holder and lower lever, behind hub holder bolt
exit hole (2)
10. Using the drill, remove damaged threading by drilling into nut screw seat (2) until the drill bit
comes out of the other side by a few millimeters (3).
MTB_153_HeliCoil_Repair
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11. Remove drill and special tool Helicoil Insertion Centering Tool 900000223.
12. Using a suitable clean cloth, clean and remove any residual metal fragments from inside the
bolt hole (B).
13. Install tap (1) included in the thread repair kit onto a suitable tap wrench (2) as shown.
14. Using a commercially available13/16-15/16 bushing guide, insert the 13/16 end of the
bushing guide into the unthreaded seat (A), lubricate the tap head then insert the tap in
through the bushing driver as shown below in the illustration.
MTB_153_HeliCoil_Repair
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Bushing driver uses as a guide
is Mac Tools item # BD3142-9.
Bushing driver size is (13/1615/16)
Side View of how the Tap
will look passed through the
bushing driver inserted into
the non-threaded end of the
knuckle assembly. Ensure
Tap is level before beginning
threading process
15. Tap hole (B) by rotating and pressing slightly on the tap, until it comes out by a few
millimeters on the other side as shown below.
16. Thoroughly clean and remove any residual metal from the bolt hole (B).
MTB_153_HeliCoil_Repair
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17. Install Helicoil (1) onto the manual insertion tool (2) included in the thread repair kit as
shown.
18. Ensure that the Heli-Coil is inserted enough that it sits flush with the outside edge of the
threaded section.
 With the relevant Helicoil fitted correctly on the insertion tool, position the tool
on nut screw (B) opening, and turn slowly, making sure that the Helicoil is fitted correctly
inside seat (B) and does not stick out.
 Make sure that Helicoil (B) is inserted correctly, checking that it adheres perfectly to the
threading.
 If the Helicoil is not fitted correctly, remove it and repeat the insertion procedure.
 Then, break Helicoil driver:
 Using a hammer or the palm of your hand, hit firmly but not too hard on the head
of insertion tool (1).
MTB_153_HeliCoil_Repair
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
 Make sure that the Helicoil driver, previously broken, is not stuck inside seat (B).
At the end of the procedure, replace metal ring (1) inside the unthreaded seat of hub holder
 Thread repair procedure is complete.
 Reassemble suspension corner according to workshop procedure and torque
requirements
SERVICE TIME


Part No.
o
6.20.007 Rh.
o
6.20.008 Lh.
Operation Code:
o
6.20.007.9 Rh. Rear rh hub holder - Shock Absorber Mount Helicoil Assembly
(1.00 h).
o
6.20.008.9 Lh. Rear lh hub holder - Shock Absorber Mount Helicoil Assembly
(1.00 h).
MTB_153_HeliCoil_Repair
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All rights reserved. Reproduction or translation
in whole or in part is not permitted without
authorization from the publisher. Printed in
USA