TSIB 21-05

TECHNICAL SERVICES
INFORMATION BULLETIN
TSIB 21-05, rev A
06/02/2021
TO:
All operators
TITLE:
Coolant Hump Hose Replacement
Model Year 2017-2021 J4500 coach model: 67759 - 69938
Model Year 2019-2021 J3500 coach model: 21000 - 21085
APPLICABILITY:
Model Year 2017-2020 D4X0X coach model: 14197 – 15920
Model Year 2019-2021 D45CRT-LE coach model: 81000 – 81099
Model Year 2020 D4520 coach model: 81084, 81085
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 21-05
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04/29/2021
1.0
Description
This bulletin is to inform of part number supersession of the coolant hump hose, MCI P/N: 6L-8-353, to
06-08-2262. Detailed location of the hose(s) for each coach model and engine configuration is shown
below.
2.0
Material requirements
Refer to Sections 4.1, 5.1, 6.1, 7.1, 8.1, 9.1 and 10.1.
If an order was placed for 6L-8-353, you will automatically receive the new 06-08-2262 hose from NFI
parts.
3.0
Special tools
No special tools required.
4.0
Hose replacement on J4500 coaches equipped mechanical cooling fan
4.1
Material requirements
ITEM
PART NO
QTY
U/M
DESCRIPTION
1
06-08-2262
3
EA
Hose-Hump Coolant
4.2
Coaches equipped with ISX engine
Replace the two hoses connected to the radiator and the hose connected to the trans cooler.
Torque the radiator side
clamps to 115 In-Lb
After installing the new hose, torque the two radiator side clamps to 115 In-Lb and the remaining six
clamps to 13 In-Lb
4.3
Coaches equipped with DD13 engine
Replace the two hoses connected to the trans cooler and the hose connected to the radiator.
Torque the radiator
side clamp to 115 In-Lb
After installing the new hose, torque the one clamp on the radiator to 115 In-Lb and the remaining ten
clamps to 13 In-Lb.
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5.0
Hose replacement on J4500, J3500 and D45CRT-LE coaches equipped electrical cooling fan
5.1
Material requirements
ITEM
PART NO
QTY
U/M
DESCRIPTION
1
06-08-2262
1
EA
Hose-Hump Coolant
5.2
Coaches equipped with ISX engine
Replace the hose connected to the trans cooler.
After installing the new hose, torque the clamps to 105 In-Lb.
5.3
Coaches equipped with DD13 engine
Replace the hose connected to the trans cooler.
After installing the new hose, torque the clamps to 105 In-Lb.
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6.0
Hose replacement on J4500, D4520 and D45CRT-LE coaches equipped with Cummins X12 engine
6.1
Material requirements
ITEM
PART NO
QTY
U/M
DESCRIPTION
1
06-08-2262
1
EA
Hose-Hump Coolant
6.2
Coaches equipped with ISX engine
Replace the hose connected to coolant pipe.
After installing the new hose, torque the clamps to 105 In-Lb.
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7.0
Hose replacement on DX0X coaches equipped with mechanical cooling fan and Cummins ISX
CNG engine
7.1
Material requirements
ITEM
PART NO
QTY
1
7.2
06-08-2262
4
U/M
DESCRIPTION
EA
Hose-Hump Coolant
Hose replacement
Replace the hoses connected to the trans cooler, coolant return pipe and radiator inlet pipes.
After installing the new hose, torque the clamps to 13 In-Lb
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8.0
Hose replacement on DX0X coaches equipped with mechanical cooling fan and Cummins ISX
diesel engine
8.1
Material requirements
ITEM
PART NO
QTY
1
8.2
06-08-2262
3
U/M
DESCRIPTION
EA
Hose-Hump Coolant
Hose replacement
Replace the hoses connected to the radiator inlet pipes.
After installing the new hose, torque the clamps to 13 In-Lb
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9.0
Hose replacement on DX0X coaches equipped with electrical cooling fan and Cummins ISX
diesel/CNG engine
9.1
Material requirements
ITEM
PART NO
QTY
1
9.2
06-08-2262
4
U/M
DESCRIPTION
EA
Hose-Hump Coolant
Hose replacement
Replace the hoses connected to the trans cooler, coolant return pipe and radiator inlet pipes.
After installing the new hose, torque the clamps to 13 In-Lb
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10.0
Hose replacement on DX0X coaches equipped with Cummins X12 engine
10.1 Material requirements
ITEM
PART NO
QTY
1
10.2
06-08-2262
2
U/M
DESCRIPTION
EA
Hose-Hump Coolant
Hose replacement
Replace the hoses connected to the radiator inlet pipes.
After installing the new hose, torque the clamps to 13 In-Lb.
If you have questions, or need further assistance, please contact the MCI Technical Call Center @
1-800-241-2947
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