Service

Technical Information

19/20

ENU

WLA4

1

WLA4 - Retrofitting Heat Shield (Workshop Campaign)

Revision:

This bulletin replaces bulletin Group 1 19/20 WLA4, dated April 30, 2020.

Model Year:

As of 2014 up to 2019

Vehicle Type:

911 Turbo (991)

Subject:

Heat shield on rear cross member

Information:

Foreign bodies, or material that is not part of the engine design or manufacture (e.g. cleaning
cloths), in the engine compartment may touch hot exhaust system components, causing a
potential fire hazard.
Analysis of this damage has identified foreign objects or materials (e.g. cleaning cloths) found in the
engine compartment as the cause of these incidents. Foreign objects or materials of this kind can touch
hot exhaust system components while driving, causing them to ignite.

Remedial
Action:

Retrofit heat shield on rear cross member in the engine compartment.
This shield may help to prevent any foreign objects or materials from touching exhaust-carrying or hot
components in the engine compartment.

Affected
Vehicles:

Only the vehicles assigned to the campaign (see also PCSS Vehicle Information). This campaign affects
41,925 vehicles in North America.

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Technical Information

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Installation
Position:

Installation position of heat shield

Required parts and materials
Parts Info:

Materials:

Part No.

Designation

Qty.

00004330476

 Heat shield

1 ea.

00004330477

 Blind rivet

2 ea.

Required materials (usually already available at the Porsche dealer):
•

Corrosion protection paint (commercially available)*

* For warranty processing, the Part No. WLA40000001 with the "expendable items" designation can be
invoiced as an additional part in the warranty claim. Maximum cost: $0.12.

Required tools
Tools:

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•

PNA 713 001 5 - Rivet Tool or commercially available riveting tool for blind rivets with a diameter
of at least 4.2 mm (rivet pin)

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Technical Information
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•
•
•
•
•

19/20

ENU

WLA4

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Commercially available HSS twist drill with a diameter of 6.5 mm
90° countersink tool or triangular scraper
Battery-operated or hand drill
Water-resistant pen
Commercially available body brush
Center punch

Preparatory work
Work Procedure: 1

2

Remove air cleaner housing  Workshop Manual '242519 Removing and installing air cleaner
housing'.
Loosen lower pressure pipe.
2.1

Loosen inner screw-type clamps 
Loosening lower pressure pipe -1- and
pull pressure pipes  Loosening lower
pressure pipe -3- out of the pressure hoses
 Loosening lower pressure pipe -2- (
Loosening lower pressure pipe -arrows A-).

2.2

Pull pressure pipe at both sides up out of the
rubber mounting in the cross member 
Loosening lower pressure pipe -arrows B-.
Loosening lower pressure pipe

Installing heat shield on rear cross member
WARNING
Airborne metal debris and dust particles produced during grinding, drilling and milling
•

Risk of eye injuries

•

Irritation to respiratory system



Wear personal protective equipment consisting of protective goggles, breathing mask and protective
gloves.

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Work Procedure: 1

ENU

Technical Information

19/20

Prepare for installing the heat shield on the rear cross
member.
1.1

Position heat shield  Marking installation
position of heat shield -1- on the cross
member  Marking installation position of
heat shield -3- as shown and align it using the
rubber sleeve  Marking installation position
of heat shield -2-.

Marking installation position of heat shield

1.2

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Part No.

Designation

Qty.

00004330476

Heat shield

1 ea.

Mark the positions of the holes for the blind rivets that will be used later to secure the heat
shield to the cross member.
To do this, mark the position for the holes using a water-resistant pen as shown  Marking
installation position of heat shield.

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19/20

1.3

Punch the markings you made on the cross
member using a center punch to make
it easier for the drill to get a grip during
subsequent drilling.

1.4

Carefully drill the cross member at the
previously marked and punched positions
using the hand drill and a twist drill bit with a
diameter of 6.5 mm.
Be particularly careful not to damage
adjacent components while drilling and make
sure to remove any drill chips immediately
using a vacuum cleaner. Use a suitable base,
if necessary, to protect components.

1.5

De-burr holes using a triangular scraper or a
90° tapered countersink.

1.6

Apply primer to the surface at the hole that is
exposed as a result of drilling.

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WLA4

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Drilling cross member

Secure heat shield on the cross member.
2.1

Position heat shield  Securing heat shield
-1- over the holes you made earlier on the
cross member  Securing heat shield -3-.

2.2

Insert blind rivet  Securing heat shield -2into the mouthpiece of the blind riveting tool
and install it fully into the first hole using the
blind riveting tool.

Securing heat shield
Part No.

Designation

Qty.

00004330477

Blind rivet

2 ea.

2.3

Hold the blind riveting tool at a right angle to the cross member and press down firmly.

2.4

Actuate the blind riveting tool to fix the rivet.

2.5

After fixing the rivet,eject the spent rivet mandrel from the blind riveting tool. Gather up spent
mandrels and dispose of them.

2.6

Repeat the riveting process on the second hole.

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Concluding work
Work Procedure: 1

Secure lower pressure pipe.
1.1

Insert pressure pipes at the sides into the
pressure hoses.

1.2

Press pressure pipes into the rubber
mountings on the cross member

1.3

Position and tighten outer screw-type clamps.
Tightening torque 5.5 Nm (4 ftlb.)

2

3

Install air cleaner housing  Workshop Manual
'242519 Removing and installing air cleaner
housing'.

Securing lower pressure pipe

Enter the campaign in the Warranty and Maintenance booklet.

Warranty processing
Scope 1:

Only relevant for 911 Carrera (991) – see Technical Information for these vehicle types

Scope 2:

Only relevant for 911 Turbo (991)
Working time:
Labor time: 176 TU

Retrofitting heat shield
Includes:
Removing and installing rear spoiler
Removing and installing air cleaner housing
Parts required:
00004330476

Heat shield

1 ea.

00004330477

Blind rivet

2 ea.

Expendable items *

1 ea.*
(for warranty invoicing only)

Required materials:
WLA40000001*

* For warranty processing, enter the Part No. WLA40000001 with the "expendable items" designation as an additional part costing $0.12 in the warranty claim.
 Damage Code WLA4 066 000 1

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Technical Information

19/20

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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.

© 2021 Porsche Cars North America, Inc.

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