SP18-39C Service Bulletin/Repair Instructions

SP18-39C
Special Bulletin

Date
Expiration
11.2018
Revision: C
Expiration date removed
Release
Page
2
1(38)
12/22/2020
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
SP18-39C
Special Bulletin

Date

11.2018
Expiration
Release
Page
2
2(38)
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
EXHAUST CLAMP 5"
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
SP18-39C
Special Bulletin

Date

11.2018
Expiration
Release
Page
2
3(38)
Part 1- H3 SERIES AND X3 SERIES VEHICLES
Writer:
EL
SP18-39C
Special Bulletin

Date
Expiration
11.2018
Release
Page
2
4(38)
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
SP18-39C
Special Bulletin

Date
Expiration
11.2018
Release
Page
2
5(38)
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
SP18-39C
Special Bulletin

Date
Expiration
11.2018
Release
Page
2
6(38)
SCR CONVERTER REMOVAL

7. Disconnect the SCR converter drain tube
H3 SERIES
X3 SERIES
Writer:
EL
SP18-39C
Special Bulletin

Date
Expiration
11.2018
Release
Page
2
7(38)
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
SP18-39C
Special Bulletin

Date
Expiration
11.2018
Release
Page
2
8(38)
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
SP18-39C
Special Bulletin

Date
Expiration
11.2018
Release
Page
2
9(38)
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
SP18-39C
Special Bulletin

Date
Expiration
11.2018
Release
Page
2
10(38)
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
SP18-39C
Special Bulletin

Date
Expiration
11.2018
Release
Page
2
11(38)
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
from the fixing points at the bottom.
23. X3 SERIES – Unbolt the lower support bracket from the

chassis (4 bolts).
X3 SERIES
Writer:
EL
SP18-39C
Special Bulletin

Date
Expiration
11.2018
Release
Page
2
12(38)
24. X3 SERIES – Lift the SCR converter and then remove

the lower support bracket to ease removal of the SCR

12 3

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