TSIB 21-10

TECHNICAL SERVICES
INFORMATION BULLETIN
TSIB 21-10 Rev C
December 20, 2021
TO:
All Operators
TITLE:
MCI Main Distribution Panel Protection
MCI coaches with Main Distribution Panel, MCI P/N: 07-08-7940:
J4500 - All coaches beginning with MY 2017 to 2021.
J3500 - All coaches beginning with MY 2018 to 2021.
APPLICABILITY:
D45CRT - All MY 2021 coaches.
D45CRT-LE - All coaches beginning with MY 2018 to 2021.
D4520 – All MY 2020 coaches.
D4X0X – All coaches beginning with MY 2017 to 2020.
Read this entire procedure before beginning work.
Use Safe Shop Practices at All Times.
To avoid personal injury:
a. Proper Personal Protective Equipment (PPE) must be worn. Safety glasses and
protective gloves are required for working with DEF Fluid.
b. Turn the main battery disconnect switch to the OFF position.
c. Ensure that both the front and the rear wheels are chocked.
d. Position the ENGINE RUN and ENGINE START switches on the engine
compartment remote control box to the OFF position.
e. Allow enough time for components to cool down prior to working in the engine
compartment.
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TSIB 21-10 Rev B
Page 1 of 13
December 7, 2021
1.0
Description
This TSIB is being issued in relation to NHTSA Recall 21V-748 and Transport Canada recall 2021-578.
Due to the current global parts shortage, the components required to conduct the related recall repair
instructions are not currently available. This is specific to repair instructions ITS60272 (J4500), ITS-60335
(J3500), ITS 60283 (D Coach), and ITS60298 (D45CRT and D4520 coach).
In the interim period, prior to these repair instructions being incorporated on the buses identified above,
MCI recommends conducting an immediate inspection of the MDP, MCI P/N: 07-08-7940, and regular
interval inspections every 6000 miles for signs of thermal stress or corrosion following this inspection
procedure.
Once the recall repair instructions have been incorporated, the inspections described below will no longer
be required.
2.0
3.0
Material Requirements
ITEM
PART NO
QTY
U/M
DESCRIPTION
1
19-11-258
10
EA
TYRAP -7.31” LONG
Special Tools
CRC SP-400 - Corrosion Inhibitor (Vendor: CRC, VPN: 03282)
Calibrated Torque Wrench
4.0
MDP cover disassembly
4.1
J4500/J3500/D45CRT-Le/D4520 coach models:
Locate the Main Battery Disconnect Switch and ensure it is in the off position.
Turn off
MDS.
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TSIB 21-10 Rev B
Page 2 of 13
December 7, 2021
Disconnect GND, 12V, and 24V battery cables from the coach batteries. Ensure the battery cables do not
come in contact with each other or the coach.
Disconnect all
battery cables.
Locate the MDP compartment mounted on the rear wall in the battery compartment. Remove and save
the 4 thumb screws to release the MDP cover.
Remove and save 4
thumb screws.
Remove 5 tyraps located at the bottom of the plastic MDP cover to remove the cover.
Remove 5 tyraps &
remove cover.
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TSIB 21-10 Rev B
Page 3 of 13
December 7, 2021
Remove tyraps that secure BT-P162 to the Main Disconnect Switch cables.
Remove BT-P162 tyraps on
battery cables.
Disconnect connectors BT-P161 and BT-P162 from MDP.
Disconnect BT-P161
and BT-P162.
4.2
D4X0X coach models:
Locate the Main Battery Disconnect Switch and ensure it is in the off position.
Turn off
MDS.
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TSIB 21-10 Rev B
Page 4 of 13
December 7, 2021
Remove and save the two thumbscrews from the MDP cover.
Remove the thumb
screws
Remove and save 4 screws holding the MDP cut-out part to the MDP cover.
Remove and save the
screws
Disconnect the two connectors, BT-P162 and BT-P161, from the main distribution panel.
Disconnect the wires
Slide out and save the battery compartment cover out of the bracket.
Slide the cover out
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TSIB 21-10 Rev B
Page 5 of 13
December 7, 2021
5.0 MDP Inspection
Inspect the front of the MDP for corrosion at all connectors and verify the retaining nuts for all the power
cables are properly torqued. If corrosion is found, replace the MDP.
 NOTE: Refer to the last page of this procedure for power stud torque specifications of the MDP.
If no corrosion is found, inspect for heat damage on the BT-P162 connector. If heat damage is observed,
perform section 6.0. Otherwise, skip to Section 7.0.
Bad
Perform Section 6.0
Good
Skip to Section 7.0
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TSIB 21-10 Rev B
Page 6 of 13
December 7, 2021
6.0
HVAC Wire Relocation
Cut HVAC wires CT0021, CT0022, CT0026, and CT0027 4-5 inches from the 24V BT-P162 connector.
Cut wires inches after the
connector
 NOTE: Heatshrink and tie back the wire attached to the pins to avoid corrosion.
Crimp HHG in-line fuse holders, MCI P/N: T19-1168 or similar, to the HVAC wires and a 1/2” ring terminal
at the end, MCI P/N: 19-11-1171 or similar.
Crimp inline fuse holder to
the HVAC wires
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TSIB 21-10 Rev B
Page 7 of 13
December 7, 2021
Remove 20A fuses from the MDP and install them in the in-line fuse holders.
Remove 20A fuses and
install in in-line fuse holders
Connect the modified HVAC wires to either 24V SW stud on the MDS as shown below for various coach
models. Torque the nut to 300 In-lbs.
Connect the modified HVAC
wires to 24V SW stud on MDS
J4500/J3500/D45CRTLe/D4520 coach models
Connect the modified HVAC
wires to 24V SW stud on MDS
D4X0X coach models
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TSIB 21-10 Rev B
Page 8 of 13
December 7, 2021
7.0
MDP Protection
After completing the inspection, cover all open connectors and fuse slots with masking tape.
Cover open
connectors and
fuse slots.
Using short sprays, apply the corrosion inhibitor, MCI P/N: 23-02-0119, on all power and fuse studs. Wipe
off any excessive corrosion inhibitor from the fuse windows using a dry rag.
Spray anticorrosive on
MDP studs.
8.0
MDP Cover Assembly
8.1
J4500/J3500/D45CRT-Le/D4520 coach models:
Route through the MDP cover holes and secure connectors BT-P161 and BT-P162 to the MDP board.
Connect BT-P161 and
BT-P162.
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TSIB 21-10 Rev B
Page 9 of 13
December 7, 2021
Secure the MDP cover using the 4 thumb screws, MCI P/N: 07-08-9231.
Install 4 thumb
screws.
Secure the BT-P161/BT-P162 harnesses to the MDP cover using 5 tyraps, MCI P/N: 19-11-258, and
existing mounts.
Secure harness
using 5 tyraps.
Loosely secure the BT-P162 branch to the MDS battery cables, allowing a smooth curve on the harness.
Ensure there is no side strain at the connector.
Loosely secure BT162 to MDS Cables.
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TSIB 21-10 Rev B
Page 10 of 13
December 7, 2021
8.2
D4X0X coach models:
Slide in and discard the battery compartment cover out of the bracket.
Slide the cover in
Connect the two connectors, BT-P162 and BT-P161, to the main distribution panel.
Connect the wires
Re-install the MDP cut-out part to the MDP cover using existing screws.
Re-install MDP cut-out
part
Secure the MDP cover using the existing two thumbscrews.
Re-install the MDP
cover
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TSIB 21-10 Rev B
Page 11 of 13
December 7, 2021
Secure the BT-P162 and BT-P161 connectors to the MDP cover using 2 tyraps, MCI P/N: 19-11-258.
Ensure the tyraps do not create tension at the pins or connectors.
Secure BT-P162/ BT-P161
to MDP cover.
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TSIB 21-10 Rev B
Page 12 of 13
December 7, 2021
9.0
Appendix
Torque values for Main Distribution Panel studs:
End of the procedure
If you have questions or need further assistance, please contact the MCI Technical Call Center @
1-800-241-2947.
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TSIB 21-10 Rev B
Page 13 of 13
December 7, 2021