OK found it. Don't know how to attach a PDF so have copied and pasted!!
1
MASERATI NORTH AMERICA, INC.
TECHNICAL SERVICE DEPARTMENT
TECHNICAL INFORMATION
Section Section serial n° Bulletin n° Date Pages
1 43 200722 13 August 2007 5
MODEL: M138 (all models), M139 (all models)
SUBJECT: Auxiliary Belt Noise
In case of customer complaint of a squealing noise, or in case of a squealing noise
occurring during PDI, then it is necessary to replace the accessory belt (Figure 1,
Callout 1) AND align the alternator pulley.
Figure 1
This bulletin is organized in the following sections:
A. Important Notes
B. Procedure for Resolving the Noise from the Auxiliary Belt
C. Warranty Information
2
A. Important Notes
• The following vehicles are affected by the noise:
All M139 (DuoSelect and Automatic) up to an including Assembly #
33414
All M138
• The root cause of the noise could be the belt having poor alignment across the
alternator pulley.
• This issue does NOT cause damage or rupture of the belt, nor loss of integrity
and function; it only causes noise.
• Refer to the Technical Documentation to correctly identify the parts and the
operating procedure referenced in this document.
• Protect all exposed parts against possible damage
3
B. Procedure for Resolving the Noise from the Auxiliary Belt
1. Remove the air filter assembly and intake
manifold to gain access to the belt (refer
the Service Manual)
2. Loosen the mounting screw on the right
side of the alternator (A, Figure 2), and
remove the mounting screw on the left side
of the alternator (B, Figure 2).
Figure 2
3. Set the distance between the interior side
of the front bushing and the left cylinder
head according to the following
specifications per model:
• 3 ± 0.1 mm for M139 Automatic
• 2 ± 0.1 mm for M139 DuoSelect and
all M138
NOTE: It is recommended to use a thickness
gauge to verify the final, adjusted distance. Figure 3
4. Tighten the left rear bushing until there is
no space between it the bushing and the
alternator (Arrows, Figure 4).
Figure 4
4
5. Screw (without tightening) the screw on the
left mounting side of the alternator (B,
Figure 5), while keeping the rear bushing
locked in place.
Figure 5
6. Tighten the screw of the right mounting
side of the alternator (Arrow, Figure 6) to a
value of 49 Nm.
Figure 6
7. Tighten the screw of the left side of the
alternator (B, Figure 7) to a value of 49 Nm,
while keeping the rear bushing locked in
place.
8. Reassemble the intake manifold and air
filter assembly.
Figure 7
5
C. Warranty Information
FOR M139
• Component code 1.11.002
• Labor operation 1.11.002.9 (4h)
• Problem code 67
• Cost code 16
FOR M138
• Component code 8.20.005
• Labor operation 8.20.005.9 (3h)
• Problem code 67
• Cost code 16
Blue on Line Report is NOT REQUIRED
ABM Authorization is NOT REQUIRED
