Service

Technical Information

6/14

ENU

1373

1

Checking Belt Tensioner In The Event Of A Complaint About "Leaks" (6/14)

Revisions:

Revision 1 — June 27, 2018
Changes/additions:
Reference to required photographic documentation added under Information.

Model Year:

As of 2010

Model Line:

Panamera (970)
Cayenne (92A)
Macan (95B)

Concerns:

Belt tensioner

Information:

Checking belt tensioner in the event of a complaint about "leaks" before carrying out any other
work.
Information
Our analyzes have shown that traces of oil on the hydraulic belt tensioner are only very rarely caused
by a leaking belt tensioner.
Given this, it is important to check where the oil leak/oil contamination is coming from before replacing
the belt tensioner:
•

Clean the belt tensioner and spray it with a suitable leak-locating agent/leak detecting spray
(commercially available). Cover adjacent areas around the belt tensioner with a cloth. Spray leak
detecting spray only on the belt tensioner. Never spray leak detecting spray on the drive
belt or deflection and tensioning rollers.

•

When cleaning the belt tensioner, check for oil contamination on other components near the
drive belt. Oil that is leaking from another component, for example, can be distributed/transferred
to the belt tensioner via the drive belt.

•

Then perform a test drive.

•

After the test drive, check the belt tensioner for oil leaks and assess any traces of oil that are visible.

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Jun 27, 2018
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1

Service
1373

ENU

Technical Information

6/14

Information
For repair scopes, which are invoiced using WWS, the repairs must always be documented in PQIS
by taking photos:
•

before cleaning/before carrying out any other work and

•

after cleaning/test-driving the vehicle

and attaching them to the job.
For further information about the required documentation, see  Technical Information '0X0000 Documentation requirements particularly for repairing visually or acoustically verifiable complaints in warranty
and goodwill cases (14/16)'.
Assessment:

"Oil sweating" around the boot bleed point (cut-out):
•
•
•

Traces of oil are visible,
the amount of oil emerging does not form drops of oil and
there is no oil visible on the underbody protection or on the ground.

 No action is required in this case.
"Drops of oil":
•
•
•
•

Oil is clearly visible,
the oil is clearly coming from the belt tensioner,
the amount of oil emerging forms a trail with drops of oil and
oil is also visible on the underbody protection and on the ground.

 The belt tensioner must be replaced in this case.
Noises:

Tip for analyzing noises:
In the event of a complaint about noise, if the noise is coming from the belt tensioner, please
proceed as follows:
 Create a relevant sound file of the noise and attach it to the PQIS job.

References:

 Workshop Manual '137319 Removing and installing belt tensioner'

Important Notice: Technical Bulletins issued by Porsche Cars North America, Inc. are intended only for use by professional automotive technicians who have attended Porsche service training
courses. They are written to inform those technicians of conditions that may occur on some Porsche vehicles, or to provide information that could assist in the proper servicing of a vehicle. Porsche special
tools may be necessary in order to perform certain operations identified in these bulletins. Use of tools and procedures other than those Porsche recommends in these bulletins may be detrimental to the
safe operation of your vehicle, and may endanger the people working on it. Properly trained Porsche technicians have the equipment, tools, safety instructions, and know-how to do the job properly and
safely. Part numbers listed in these bulletins are for reference only. The work procedures updated electronically in the Porsche PIWIS diagnostic and testing device take precedence and, in the event of a
discrepancy, the work procedures in the PIWIS Tester are the ones that must be followed.

© 2018 Porsche Cars North America, Inc.

Jun 27, 2018
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