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31 07 19_SERVICE ACTION: APPLY CAVITY WAX PROTECTION INSIDE THE FRONT AXLE SUPPORT

SIB 31 07 19
SERVICE ACTION: APPLY CAVITY WAX PROTECTION INSIDE THE
FRONT AXLE SUPPORT

2020-01-16

Please perform the procedure outlined in this Service Information on all affected vehicles before customer
delivery. In the event the customer has already taken delivery of the vehicle, please perform the procedure
the next time the vehicle is in the shop.
This Service Information Bulletin (Revision 1) replaces SI B31 07 19 dated November 2019.
What’s New (Specific text highlighted):
• Warranty- Sublet code value

MODEL
G20 (3 Series Sedan)

AFFECTED VEHICLES
Vehicles which require this Service Action to be completed will show it as “Open” when checked either in
AIR, the "Service Menu" of DCSnet (Dealer Communication System) or with the Key Reader.

SITUATION
The corrosion protection applied to the inside of the front axle support during the manufacturing process
may have minor coating defects. In individual cases, this can lead to localized rust damage on the front axle
support over the service life of the vehicle.

CAUSE
Manufacturing process error.

CORRECTION
Apply cavity protection P/N 83 42 2 457 337 into the designated areas of the front axle support.
Note: One can of cavity spray wax is sufficient to cover the application in two vehicles.

PROCEDURE
For rear wheel drive (RWD) vehicles refer to attachment 1: Apply cavity protection, RWD
For all wheel drive (AWD) vehicles refer to attachment 2: Apply cavity protection, AWD

PARTS INFORMATION
Part Number
83 42 2 457 337

Description
Cavity Protection (400 ml)

Quantity
1

WARRANTY INFORMATION
Reimbursement for this Service Action will be via normal claim entry utilizing the following information:
Defect Code:

0031970100

Completion before the first vehicle delivery to a customer or the vehicle is already in the workshop.

Copyright ©2020 BMW of North America, Inc.
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Work Pkg
#1

31 07 19_SERVICE ACTION: APPLY CAVITY WAX PROTECTION INSIDE THE FRONT AXLE SUPPORT

Labor Operation
00 68 536

Description (Plus work)

Labor Allowance

Preserving the front axle support

3 FRU (G20 3
Series xDrive);
4 FRU (G20 3
Series)

Or:
The vehicle arrives at your center and this Service Action shows open (No other Main work will be
performed/claimed during this workshop visit)
Work Pkg
#2

Labor Operation
00 68 029

Description (Main work)

Labor Allowance

Preserving the front axle support

5 FRU (G20 3
Series xDrive);
6 FRU (G20 3
Series)

Claim Repair Comments
Only reference the SIB number and the work package (Pkg) number performed in the RO technician notes
and in the claim comments (For example: B31 07 19 WP 1), unless otherwise required by State law.
And, as needed:
Sublet – Bulk Material (RO and Claim Comments Required)
Sublet Code 4

Up to $16.00

Reimbursement for the repair-related bulk materials (Do not use
the BMW part number for claim submission)

Sublet reimbursement calculation for claiming the applicable repair-related bulk material (BMW part number)
is at the dealer net price amount for the quantity used plus your center’s handling.
Enter this material cost in sublet and itemize the amount on the repair order and in claim comment section.

Supporting Materials
picture_as_pdf B31 07 19_Attachment 1 Apply Cavity Protection RWD.pdf
picture_as_pdf B31 07 19_Attachment 2 Apply Cavity Protection AWD.pdf

Copyright ©2020 BMW of North America, Inc.
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Attachment 1 to SI B31 07 19

October 2019

Service Action: Apply cavity protection inside the front axle
support, RWD
Procedure
For rear wheel drive (RWD) vehicles proceed to the next step.
For all-wheel drive vehicles, refer to Attachment 2 “Apply cavity protection, AWD”
RWD:
• Remove the center underbody protection as per REP 51 47 492
•

Release the six fastening screws (yellow
arrows) to expose the front area of the axle
support

•

Blow out the front axle support at the
openings (circled) with compressed air
Wear safety glasses
Full insert the cavity wax* tube in the
access holes (circled) and spray in the
direction of the arrows. Slowly pull back the
can while applying the cavity wax until the
tube is about to exit the hole to ensure the
entire area is protected

•

Note- the access hole opening must also
be coated. Wipe off any excess wax which
runs out of holes or other joints
* Cavity wax P/N 83 42 2 457 337

1

•

•

Blow out the front axle support at the
openings (circled) with compressed air
Wear safety glasses
Fully insert the cavity wax tube in the
access holes (circled; left side shown) and
spray in the direction of the arrows. Slowly
pull back the can while applying the wax
until the tube is about to exit the hole to
ensure the entire are is protected
Note- the access hole openings must also
be coated. Wipe away any excess wax
which runs out of the holes or other joints

•
•

•

Repeat the procedure on the other side of
the front axle support
Blow out the front axle support at the
opening (circled) with compressed air
Wear safety glasses
Fully insert the cavity wax nozzle in the
access holes (circled) at the center of the
front axle support and spray outwards in
the direction of the arrows. Slowly pull back
the can while applying the wax until the
tube is about to exit the hole to ensure the
entire are is protected.
Note- the access hole openings must also
be coated. Wipe away and excess wax
which runs out of the holes or other joints

•

Reassemble

2

Attachment 2 to SI B31 07 19

October 2019

Service Action: Apply cavity protection inside the front axle
support, AWD
Procedure
For all wheel drive (AWD) vehicles proceed to the next step.
For rear-wheel drive vehicles, refer to Attachment 1 “Apply cavity protection, RWD”
AWD:
•

Blow out the front axle support at the
openings (circled) with compressed air.
Wear safety glasses

•

Fully insert the cavity wax* tube in the
access holes circled and spray in the
direction of the arrows. Slowly pull back
the can while applying the cavity wax
until the tube is about to exit the hole to
ensure the entire area is protected.
Note- the access hole opening must
also be coated. Wipe off any excess wax
which runs out of the holes or other
joints

*Cavity wax P/N 83 42 2 457 337
Note- The cavity wax will need to reach the
front area of the axle support as indicated by
the yellow arrows (viewed looking up from
beneath vehicle).
The following 3 photos will indicate the access
points for applying the cavity wax. All cleaning
and application should be applied in the
direction as indicated by the arrows shown here

1

•

Release the two screws from the bottom
of the left front wheel well cover (view
looking forwards) to expose the left rear
opening of the front axle support
Note- The right front wheel well cover
does not need be released as the axle
support is exposed at the right rear

•

Blow out the front axle support at the
opening (circled) with compressed air.
Be sure to blow out the inside and
outside of the opening. Repeat on right
side
Wear safety glasses

•

Fully insert the cavity wax tube in the
access holes circled and spray in the
direction to the front of the vehicle. Be
sure to apply the cavity wax to the inside
hole also. Slowly pull back the can while
applying the cavity wax until the tube is
about to exit the hole to ensure the
entire area is protected. Repeat the
procedure to the right side as well.
Note- the access hole opening must
also be coated. Wipe off any excess wax
which runs out of the holes or other
joints

•

Reinstall screws for wheel well cover

•

Blow out the front axle support at the
openings (circled, rear first) with
compressed air. Repeat on right side.
Wear safety glasses

•

Insert the cavity wax tube in the access
holes circled and spray in the direction
of the arrows. Slowly pull back the can
while applying the cavity wax until the
tube is about to exit the hole to ensure
the entire area is protected.
Note- the access hole opening must
also be coated. Wipe off any excess wax
which runs out of the holes or other
joints

2

•

Blow out the front axle support at the
opening (circled) with compressed air.
Repeat on right side
Wear safety glasses

•

Fully insert the cavity wax tube in the
access holes circled and spray in the
direction to the center of the vehicle.
Slowly pull back the can while applying
the cavity wax until the tube is about to
exit the hole to ensure the entire area is
protected.

•

Blow out the front axle support at the
opening (circled) with compressed air.
Repeat on right side
Wear safety glasses

•

Insert the cavity wax tube in the access
holes circled and spray in the direction
of the arrows. Slowly pull back the can
while applying the cavity wax until the
tube is about to exit the hole to ensure
the entire area is protected. Repeat on
right side
Note- the access hole opening must
also be coated. Wipe off any excess wax
which runs out of the holes or other
joints

•

Blow out the front axle support at the
opening (circled) with compressed air.
Wear safety glasses

•

Insert the cavity wax tube in the access
hole circled and spray in the direction to
the rear of the vehicle. Slowly pull back
the can while applying the cavity wax
until the tube is about to exit the hole to
ensure the entire area is protected.
Note- the access hole opening must
also be coated. Wipe off any excess wax
which runs out of the holes or other
joints

3