FSB 284-047

Field Service Bulletin
Trucks
Mack Trucks, Inc.
Greensboro, NC USA
Date
Group
No.
Release
Page
9.2013
284
047
01
1(7)
Oil Level Sensor Harness Wire Splice
CHU, CXU, GU, LEU, MRU, TD
FSB 284-047, Oil Level Sensor Harness Wire Splice
(September 2013)
Some MACK vehicles built between 2004 and October 2013 experience an oil level sensor
failure that leads to oil contamination into the engine wire harness. A new anti-wicking pigtail
splice kit, part number 85137983, is available. Follow the procedure below if wicking is
observed.
Note: It is not necessary to replace the entire engine harness.
Note: : If the oil level sensor is being replaced for other reasons that do not lead to wicking
into the engine wire harness, this kit is NOT necessary. This kit only applies to harnesses that
have experienced oil wicking.
Required Parts
Splice kit part number 85137983. The kit contains:
Quantity
Part Number
Description
1
3093296
Shrink Tubing
2
948211
Cable Tie
4
6781769
Connector (Splice)
1
22210355
Wire Harness
You must read and understand the precautions and guidelines in Service Information,
Function Group 30, "General Safety Practices, Electrical and Electronics" before
performing this procedure. If you are not properly trained and certified in this procedure,
ask your supervisor for training before you perform it.
PV729-FSB284-047_M
USA60614
Mack Trucks, Inc.
Field Service Bulletin
Date
9.2013
Group
No.
Release
284
047
01
Repair
1 Secure the vehicle for service by parking it on a flat level surface, applying the parking
brake, chocking the rear wheel, and placing the transmission in neutral.
2 Disconnect all cables from the negative (ground) battery terminals to prevent personal
injury from electrical shock and prevent damage to electrical components.
3 Raise hood or raise cab.
4 If necessary, remove driver side inner fender.
5 If necessary, remove the power steering reservoir and oil fill tube fasteners, position out of
the way and remove the power steering reservoir frame mounted bracket.
6 Clip applicable cable ties and remove P-clamps securing the oil level sensor harness leg.
Pull the leg up, over the frame rail, to provide best access to the length of the harness.
7 Cut the appropriate length of the contaminated harness leg that will still allow for proper
working room. Make sure the pigtail kit wire length is sufficient to reach the contaminated
harness.
Note: The length of harness to be removed will depend on the vehicle.
8 Remove the oil level sensor harness connector backshell and slide the loom away from
the connector. Do not damage the backshell nor the loom, they will be reused.
W2083442
Page
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Mack Trucks, Inc.
Field Service Bulletin
Date
9.2013
Group
No.
Release
284
047
01
9 Remove the contaminated harness connector and wires from the loom. Take the splice kit
connector and place it beside the connector from the harness.
W2083444
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Mack Trucks, Inc.
Field Service Bulletin
Date
9.2013
Group
No.
Release
284
047
01
10 Stretch the wires together and clip one wire from the splice kit to the same length as the
wires on the contaminated harness. Cut the rest of the wires in the splice kit in a staggered
pattern at increasing lengths. The length from the shortest wire to the longest wire should
be approximately 75 mm (3 in). Install the previously removed loom over the splice kit
connector.
W3083887
A.
Length of cut harness plus 75 mm (3 in) to
allow the splice stagger
B.
Length of initial harness cut
Page
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Mack Trucks, Inc.
Field Service Bulletin
Date
9.2013
Group
No.
Release
284
047
01
11 Slide a section of heat shrink tubing over the engine harness leg or the splice kit end loom
and away from the splice area.
W2083445
12 Cut the loom lengthwise approximately 50 mm (2 in) in each direction from the splice area.
W2083443
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Mack Trucks, Inc.
Field Service Bulletin
Date
9.2013
Group
No.
Release
284
047
01
13 Align the ends of the shortest wire on the splice kit and its matching color wire on the
engine harness and install a butt connector. Align the ends of the next shortest wire on the
splice kit and its corresponding wire on the engine harness. Trim the length of the engine
harness wire to maintain the staggered pattern and install a butt connector. Repeat the
process for the remaining wires.
W2083446
14 Using a heat gun, shrink and seal each butt connector. Return the wires inside the loom
sections. Slide the previously installed heat shrink tubing over the splice area and cut
looms. Using the heat gun, shrink the tubing to seal the repair. Install the connector
backshell.
15 Route the oil level sensor harness back to its original location. Install necessary cable ties
and P-clamps. Connect the sensor.
Note: If oil has wicked to the engine control module connectors, clean the connectors
thoroughly with electronic cleaner and dry with compressed air.
16 If removed, install the power steering reservoir frame mounted bracket. Install the power
steering reservoir and oil fill tube fasteners.
17 If removed, install driver side inner fender.
18 Install all the previously removed cables to the negative (ground) battery terminals.
19 Start the engine and check for proper operation.
20 Close hood or lower cab.
21 Use Tech Tool to clear any diagnostic trouble codes (DTC).
Page
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Mack Trucks, Inc.
Field Service Bulletin
Date
9.2013
Group
No.
Release
284
047
01
Page
7(7)
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.)
01
Labor Code
Primary Labor Code
2732E-01-80
CHU, CXU, LEU, MRU,
TD — 0.7 hrs.
GU — 1.4 hrs.
Causal Part
21521353
Mack Trucks Inc. reserves the right to make any changes in design or to make additions to or
upon its products without incurring any obligations to install the same on vehicles previously
built.