FSB-234-014-1

Field Service Bulletin
Trucks
Mack Trucks, Inc.
Greensboro, NC USA
SB-10044322-8678
Date
Group
No.
Release
Page
5.2012
234
014
01
1( 9 )
Fuel Tank Ventilation Filter
CHU, CXU, GU, TD
MP7, MP8, MP10
US07, US10
FSB 234-014, Fuel Tank Ventilation Filter
(May 2012)
MACK Trucks is introducing a fuel tank ventilation filter kit to prevent erosion of the engine
fuel injector tips on CHU, CXU, GU, and TD truck models. The fuel tank ventilation filter
is primarily designed for use in harsh, abrasive and dirty environments. The fuel tank
ventilation filter is added to the fuel tank vent lines and mounted on the stanchion exhaust
bracket at the right side of the truck. For single or dual tank applications, the vent-lines will
run from the tank vent fittings to the fuel tank ventilation filter. Stand-off brackets and cable
ties will be used to secure the vent-lines. Rubber tubing over the vent-lines will be used to
prevent chafing by the rear deck plate/frame.
Note: To ensure the effectiveness of the fuel tank ventilation filter system, the fuel tank
ventilation filter must be changed at the same interval as the engine air filter.
Note: This bulletin does not apply to MACK Trucks Australia.
W2069488
PV729-FSB234-014_M
USA50816
Mack Trucks, Inc.
Field Service Bulletin
Date
5.2012
Group
No.
Release
234
014
01
Required Parts
Fuel Tank Ventilation Kit 21882780
Item
QTY
Part Number
Description
1
1
85132334
Rubber Hose, 4572 mm (180 in)
2
2
21776035
Hose Nipple
3
2
85103103
Elbow
4
2
982710
Reduction Nipple
5
1
984855
Flange Screw (M14)
6
1
** 20593078
Clamp (Mount with existing hardware)
7
1
** 984942
Clamp (Mount with existing hardware)
8
1
992328
Flange Nut (M14)
9
1
** 192489
Clamp (Mount with M10 Hardware)
10
1
** 1543499
Flange Nut (M10)
11
1
** 984753
Flange Screw (M10)
12
1
20455696
Manifold (Mount with M14 Hardware)
13
1
21882786
Air Cleaner
14
16
** 948211
Cable Tie
15
6
** 20885496
Retainer
16
16
** 980464
Cable Tie
17
1
991061
Plug
18
1
85132335
Tube, 5182 mm (204 in)
19
2
21807860
Label, Fuel Tank Filter
Note: ** Due to various tank and deck plate configurations, some routing and clipping
hardware may not be used.
Replacement Fuel Filter (Not Included in Kit)
Item
QTY
Part Number
Description
1
1
21763342
Fuel Filter
Page
2( 9 )
Mack Trucks, Inc.
Field Service Bulletin
Date
5.2012
Group
No.
Release
234
014
01
Procedure
You must read and understand the precautions and guidelines in Service Information,
group 20, “General Safety Practices, Engine” before performing this procedure. If you
are not properly trained and certified in this procedure, ask your supervisor for training
before you perform it.
DANGER
Do not attempt to repair or service this vehicle without having sufficient training, the
correct service literature and the proper tools. Failure to follow this could make the vehicle
unsafe and lead to serious personal injury or death.
CAUTION
Possible damage to electronic components. Turn the vehicle ignition switch OFF before
disconnecting or connecting any electronic components. Failure to de-energize circuits
may result in permanent damage to electronic components.
1 Disconnect all cables from the negative (ground) battery terminals to prevent personal
injury from electrical shock and prevent damage to electrical components.
2
Install filter on manifold, install fittings (with Thread Sealant) on manifold in the correct
orientation, and tighten fittings.
Note: Orient fittings in a downward direction to enable moisture to drain from vent-lines.
W2069489
Page
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Mack Trucks, Inc.
Field Service Bulletin
Date
5.2012
Group
No.
Release
234
014
01
3 Install manifold and filter on exhaust stack bracket and tighten fastener to 140 ± 25
Nm (103 ± 18 ft-lb).
Note: If fastener does not fit through hole in the exhaust stack support bracket shown
below, drill out hole to accommodate the 14.0 mm (0.5 in) fastener (item 5).
W2069490
4 Cut any cable ties securing wiring to line (Right Side). Remove existing vent-lines and
discard (Right Side).
5 Install cable ties on wiring that was cut during removal of existing vent-line.
6 Reposition vent fittings on fuel tank as shown in figure below.
W2069491
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Mack Trucks, Inc.
Field Service Bulletin
Date
5.2012
Group
No.
Release
234
014
01
7 Install protective rubber tubing over vent tubing in areas where chafing may occur.
W2069492
8 Route new vent-line from fuel tank to filter (Right Side), and cut to length.
Note: Vent-lines must be routed without loops. Loops in the vent-lines will trap moisture
and contaminate the fuel.
9 Install line on filter manifold (Right Side).
Note: Install plug part number 991061 in the open port of the manifold for single tank
applications as shown in the figure below.
W2069493
Page
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Mack Trucks, Inc.
Field Service Bulletin
Date
5.2012
Group
No.
Release
234
014
01
10 Use the appropriate cable ties and clamps to secure and prevent chafing or damage to
the vent line.
Note: For single tank configurations, skip to step 18. For dual tank configurations,
continue onto step 11.
11 Cut any cable ties securing wiring to line (Left Side). Remove existing vent-lines and
discard (Left Side).
12 Install cable ties on wiring that was cut during removal of existing vent-line.
13 Reposition vent fittings on fuel tank as shown in figure below.
W2069494
14 Install protective rubber tubing over vent tubing in areas where chafing may occur.
W2069495
Page
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Mack Trucks, Inc.
Field Service Bulletin
Date
5.2012
Group
No.
Release
234
014
01
15 Route new vent-line from the fuel tank, under the deck plate, and to the filter (Left Side).
16 Install line on filter manifold (Left Side).
W2069496
17 Use the appropriate cable ties and clamps to secure and prevent chafing or damage to
the vent line.
Note: The appropriate part numbers used for routing and clipping the vent-line is
identified by double asterisks in the table on page 1.
18 Install replacement engine fuel filter, part number 21763342.
W2069497
Page
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Mack Trucks, Inc.
Field Service Bulletin
Date
5.2012
Group
No.
Release
234
014
01
19 Attach fuel tank ventilation filter labels (21807860) as shown in the figures below.
W2069498
W2069545
20 Reconnect all previously removed cables to the negative (ground) battery terminals
and remove wheel chocks.
Page
8( 9 )
Mack Trucks, Inc.
Field Service Bulletin
Date
5.2012
Group
No.
Release
234
014
01
Reimbursement
This repair may be eligible for reimbursement if a product failure was experienced
within time and mileage limits of the applicable Warranty coverage. Reimbursement
is obtained via the normal claim handling process.
Claim Type (used only when uploading from the Dealer Bus.
Sys.)
W
Labor Code
Primary Labor Code
Dual Tank Configuration
2314D-00-80
1.1 hrs.
Primary Labor Code
Single Tank Configuration
2314C-01-80
1.0 hrs.
Causal Part
40QE2187
MACK Trucks Inc. engages in a continuous program of testing and evaluating to provide
the best possible product. MACK Trucks Inc., however, is not committed to, or liable for
updating existing chassis.
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