NHTSA ID Number: 10152634
Manufacturer Communication Number: SP18-39
TSB/Document Date: 2019-01-07
Summary
This Special Bulletin explains how to perform the replacement of the SCR tank, when authorized.
Special Bulletin
SP18-39
Date
Expiration
Release
Page
11.2018
11.2020
1
1(35)
First Release
2018-11-07
SCR CONVERTER REPLACEMENT - AFTERTREATMENT SYSTEM
Prevost
vehicles
B13R (9700 us/can)
DESCRIPTION
This special bulletin is the continuity of Special Bulletin SP18-35. Only if authorized, perform the
replacement of the SCR tank.
MODEL YEAR(S) AND VEHICLES INVOLVED
NOTICE TO SERVICE CENTERS
Verify vehicle eligibility by checking warranty bulletin status with SAP or via ONLINE WARRANTY
SYSTEM available on Service / Warranty tab of Prevost's website.
Specific GHG17 & OBD18 compliant vehicles
This bulletin does not necessarily apply to all the above-mentioned vehicles, some vehicles may have been modified
before delivery.
Writer: EL
Special Bulletin
SP18-39
Date
Expiration
Release
Page
11.2018
11.2020
1
2(35)
MATERIAL NEEDED
Order kit SP18-39 which includes the following parts:
Part No.
Description
Qty
500952
SCREW, TAPPING BDG PH SS #8X1/2
12
504637
CABLE TIE, NYLON BLK
12
540067
1
21021850
CLAMP, V-BAND 5-INCH
2
21095726
GASKET EXHAUST PIPE V-BAND JOINT, 5-INCH
2
22303390
NOx SENSOR, PRE
1
22303391
NOx SENSOR, POST
1
22998036
TIE, STAINLESS STEEL
4
23190006
SCR CONVERTER
1
NOTE
Material can be obtained through regular channels.
SPECIAL EQUIPMENT REQUIRED
Writer: EL
Special Bulletin
SP18-39
Date
Expiration
Release
Page
11.2018
11.2020
1
3(35)
Part 1- H3 SERIES AND X3 SERIES VEHICLES
Writer: EL
Special Bulletin
SP18-39
Date
Expiration
Release
Page
11.2018
11.2020
1
4(35)
PROCEDURE
DANGER
Park vehicle safely, apply parking brake, stop the engine. Prior to working on the vehicle, set the ignition
switch to the OFF position and trip the main circuit breakers equipped with a trip button. On Commuter
type vehicles, set the battery master switch (master cut-out) to the OFF position.
PRELIMINARY STEPS
1. Open the engine compartment door and the SCR converter access door.
2. Remove the SCR converter access door. Doing so will
allow extraction of the SCR converter out of its
compartment.
3. The SCR converter is heavy, huge and the free space in the opening is limited. Do whatever is
necessary to protect the fiberglass and the paint around the opening giving access to the SCR. Using
adhesive tape, place pieces of cardboard around the area.
4. Remove the SCR overhead ventilation grille.
5. Loosen the clamp and then remove the diffuser
assembly with the drain tube attached.
Writer: EL
Special Bulletin
SP18-39
Date
Expiration
Release
Page
11.2018
11.2020
1
5(35)
6. Support the exhaust pipe between the SCR and the
flexible section. Remove the insulating blanket around
the pipe and then remove the two V-band clamps
securing the exhaust pipe. Move the exhaust pipe to
clear it from the SCR converter compartment.
H3 SERIES
X3 SERIES
Writer: EL
Special Bulletin
SP18-39
Date
Expiration
Release
Page
11.2018
11.2020
1
6(35)
SCR CONVERTER REMOVAL
7. Disconnect the SCR converter drain tube
H3 SERIES
X3 SERIES
Writer: EL
Special Bulletin
SP18-39
Date
Expiration
Release
Page
11.2018
11.2020
1
7(35)
8. Unscrew and remove the NOx sensor and module.
Return the NOx sensor with the defective SCR converter
to Prevost.
H3 SERIES
X3 SERIES
Writer: EL
Special Bulletin
SP18-39
Date
Expiration
Release
Page
11.2018
11.2020
1
8(35)
9. Unscrew the PM (particulate matter) sensor from the
SCR converter.
10. Secure the PM sensor and harness next to the PM
sensor module on the panel.
Keep the PM sensor for reuse
H3 SERIES
PM SENSOR
X3 SERIES
11. H3 SERIES - Remove the module panel and put aside.
H3 SERIES
Writer: EL
Special Bulletin
SP18-39
Date
Expiration
Release
Page
11.2018
11.2020
1
9(35)
12. X3 SERIES - Remove the module panel and put aside.
X3 SERIES
13. Install an appropriate lifting device to the lifting eyelets of
the SCR converter.
See the image on the right for an example of what should be
used ideally
14. With the lifting device, support the weight of the SCR
converter.
15. H3 SERIES - Remove the upper mounting bracket.
Unscrew and remove six bolts identified on the image.
H3 SERIES
Writer: EL
Special Bulletin
SP18-39
Date
Expiration
Release
Page
11.2018
11.2020
1
10(35)
16. X3 SERIES - Remove the upper mounting bracket.
Unscrew and remove seven bolts identified on the
image.
X3 SERIES
17. H3 SERIES - To give as much clearance as possible,
remove the insulating blanket pieces from the SCR
converter. This is necessary; otherwise, the SCR
converter will not pass through the opening.
H3 SERIES
18. H3 SERIES - Thread the upper bolt out about 1/4″.
19. H3 SERIES - Remove the lower bolt.
H3 SERIES - BOLTS SECURING THE SCR
CONVERTER TO THE CHASSIS - STREET SIDE
Writer: EL
Special Bulletin
SP18-39
Date
Expiration
Release
Page
11.2018
11.2020
1
11(35)
20. H3 SERIES - Thread the upper bolt out about 1/4 in.
21. H3 SERIES - Remove the lower bolt.
H3 SERIES - BOLTS SECURING THE SCR
CONVERTER TO THE CHASSIS - CURB SIDE
22. H3 SERIES - Using the lifting device, lift the SCR converter a few inches so it will disengage
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TSB/Document ID: SP18-39
Replacement Service Bulletin Number:
MFR Communication Date: 2018-11-07
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: EQUIPMENT
MFR Component System:
MFR Component Subsystem:
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