SP18-39B

SP18-39B
Special Bulletin
Date
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Page
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ADDED
Revision: B
Note about: packaging for SCR converter return, serial number of
old & new SCR converter on Repair Order.
02/19/2019
Step mentioning not to perform DPF regeneration as requested by
PTT during Data Reset process.
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

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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

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Part 1- H3 SERIES AND X3 SERIES VEHICLES
Writer: EL

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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

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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

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SCR CONVERTER REMOVAL
7. Disconnect the SCR converter drain tube
H3 SERIES
X3 SERIES
Writer: EL

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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

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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

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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

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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

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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

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24. X3 SERIES – Lift the SCR converter and then remove
the lower support bracket to ease removal of the SCR
converter.
X3 SERIES
25. While proceeding with great care, take the SCR converter out of the compartment through the L.H.
side opening. The SCR converter is heavy. Proceed with the help of a coworker.
Writer: EL

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TAKE THE STRAPS AND BRACKETS APART FROM THE DEFECTIVE SCR CONVERTER
It is IMPORTANT to take all the necessary
precautions in order to ease the installation of
the straps and brackets on the replacement SCR
converter. It is very important to position the
straps and the mounting brackets as much as
possible like they were positioned on the
defective SCR converter. Doing so will greatly
facilitate the installation of the SCT in the
compartment.
It is highly recommended to measure and/or
mark the position of the straps on the defective
SCR converter in order to have references for
positioning the straps on the new installation.
ON THE STRAP, DRAW A LINE CENTERED WITH THE DRAIN
FITTING. MEASURE THE UPPER STRAP POSITION IN
RELATION TO THE EMBOSS
ON THE STRAP, DRAW A LINE CENTERED WITH CIRCULAR
EMBOSS. MEASURE THE LOWER STRAP POSITION IN
RELATION TO THE EMBOSS
Writer: EL

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26. Remove the mounting straps and brackets from
the SCR converter. Unscrew the bolts identified by
the arrows.
H3 SERIES - UNSCREW THE BOLTS INDICATED BY THE
ARROWS
X3 SERIES - UNSCREW THE BOLTS INDICATED BY THE
ARROWS
Writer: EL

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27. H3 SERIES - Take the R.H. side lower bracket
apart from the SCR converter.
H3 SERIES - UNSCREW THE TWO BOLTS INDICATED
BY THE ARROWS
H3 SERIES - UNSCREW THE TWO BOLTS INDICATED
BY THE ARROWS
28. X3 SERIES - Install the insulating blankets recovered from the defective SCR converter. Secure with
stainless steel ties.
IMPORTANT: Make sure that the « V » clearance and the round clearance of the insulation blanket are
placed at the drain fitting and the stud found on the SCR converter respectively.
Writer: EL

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29. Install the straps and brackets on the new SCR
converter.
Install the brackets exactly as on the defective SCR
(H3 Series shown)
30. Tighten the bolts just enough to hold the straps
in place while allowing movement for position
adjustment.
Caution : The bolt head must go into the
chamfered hole
BOLT WITH THE HEAD ON THE PROPER SIDE
(OPPOSITE SIDE OF THE DRAIN TUBE FITTING)
Writer: EL

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31. Adjust the straps position in reference to the
emboss.
32. H3 SERIES - Prior final tightening, make sure
that each strap is properly centered on its
respective bracket.
Writer: EL

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33. Once properly positioned, apply final torque to
the strap bolts.
FINAL TORQUE: 30-37 lbf-ft
34. H3 SERIES - Install the R.H. side lower bracket
and tighten the bolts (4x) to proper torque.
FINAL TORQUE: 48 lbf-ft
H3 SERIES
Writer: EL

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INSTALL THE PRE-SCR NOx SENSOR
35. Apply anti-seize compound on the NOx
sensor threads and then fix onto the DPF
outlet. Secure the harness using nylon ties.
NOx sensor torque: 37 lbf-ft
Return the old NOx sensor with the SCR
converter to Prevost
REINSTALL THE SCR CONVERTER IN ITS COMPARTMENT
36. H3 SERIES - Make sure that there is
a gap of about 1/2″ between the
washer pressed against the bolt head
and the bracket surface where
indicated on the image at right (2
bolts).
H3 SERIES - LOWER BRACKETS
37. While proceeding with great care, insert the SCR converter in the compartment through the opening
using the lifting device. The SCR converter is heavy. Proceed with the help of a coworker. DO NOT
place the SCR converter in final position yet.
Writer: EL

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38. H3 SERIES - Install the upper and
lower insulating blankets recovered
from the defective SCR converter.
Secure with stainless steel ties.
IMPORTANT: Make sure that the « V »
clearance and the round clearance of the
insulation blanket are placed at the drain
fitting and the stud found on the SCR
converter respectively.
Writer: EL

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39. H3 SERIES - Install the SCR
converter in final position. Rest the
SCR converter at the fixing points on
the chassis with the two upper bolts
secured to both lower brackets.
40. H3 SERIES - Tighten the two bolts to
a firm feel.
H3 SERIES
41. H3 SERIES - Thread in and tighten
the two lower bolts to a firm feel.
H3 SERIES
Writer: EL

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42. X3 SERIES – Reinstall the lower support bracket
on the SCR converter.
43. X3 SERIES – Fasten the lower support to the
vehicle chassis.
X3 SERIES
Writer: EL

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REINSTALL THE EXHAUST PIPE AND INSULATING BLANKET
44. Clean the sealing surfaces between the after-treatment
SCR converter inlet, the exhaust pipe and the flexible
section.
45. Using a new gasket, position the pipe to the aftertreatment SCR converter and install a new V-band
clamp. Tighten the V-band clamp to specification.
Proceed similarly with the other end of the exhaust
pipe.
Gasket, qty: 2
V-band clamp, qty: 2 (torque=100 lbf-in)
H3 SERIES
X3 SERIES
46. Reinstall the insulating blanket.
H3 SERIES
X3 SERIES
Writer: EL

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X3 SERIES
INSTALLATION OF THE PM SENSOR
47. Recover the two harness mounts on the defective SCR
converter and install them on the replacement SCR
converter.
48. H3 SERIES – Reinstall the sensor module panel.
H3 SERIES
49. Installation of the PM sensor. Before installing the
PM Sensor, shake the sensor close to your ear to
detect a broken ceramic noise. If there is a sound of
broken ceramic, reject the PM Sensor, it is defective.
Install a PM sensor in good condition.
Writer: EL

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50. Before connecting the PM Sensor, make
sure you align the keying tab with the
orientation slot in the mating boss.

51. Install the PM sensor and secure the harness as shown
using nylon ties.
PM sensor torque: 37 lbf-ft
PM sensor module: 89 lbf-in
H3 SERIES
X3 SERIES
Writer: EL

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X3 SERIES
52. H3 SERIES – Take up the extra length of the PM
sensor harness shown on the image and secure to a
nylon tie mount.
H3 SERIES
Writer: EL

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INSTALL THE POST-SCR NOx SENSOR
53. Apply anti-seize compound on the NOx sensor threads
and then fix onto the SCR converter. Secure the harness
as shown using nylon ties.
NOx sensor torque: 37 lbf-ft
H3 SERIES
X3 SERIES
REINSTALL THE SCR CONVERTER DRAIN TUBE
54. Insert the tube into the fitting and then tighten firmly.
H3 SERIES
X3 SERIES
Writer: EL

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REINSTALLING THE “L” SHAPE BRACKET
55. H3 SERIES – Reinstall the upper mounting
bracket.
Writer: EL

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DIFFUSER ASSEMBLY AND GRILLE INSTALLATION
56. Slide the diffuser assembly on the SCR converter tube.
Do not tighten at this moment.
H3 SERIES – NUT ON THIS SIDE
X3 SERIES – NUT ON THIS SIDE
Writer: EL

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57. Install the drain tube.
58. Insert the drain tube in the drain tube guide.
H3 SERIES
X3 SERIES
Writer: EL

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59. Install the SCR converter compartment grille on the top
of the coach. Tighten the screw in the order shown on
the image.
#500952 tapping screw #8x1/2 SS
H3 SERIES
Impossible d'afficher l'image liée. Le fichier a peut-être été déplacé, renommé ou supprimé. Vérifiez que la liaison pointe vers le fichier et l'emplacement corrects.
X3 SERIES
60. Adjust the spacing between the diffuser assembly and
the grille. The minimum spacing should be ¼″ (6 mm).
61. Adjust the diffuser assembly height above the grille. The
edge height should be 1/8″ to 1/4″ (3 mm to 6 mm) at the
diffuser corner shown on the image while the edge
height should be 1/8″ to 1/2″ (3 mm to 12 mm) at the
outer edge for the rest of the periphery.
Writer: EL

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62. Slide the diffuser clamp close to the top of
the SCR converter outlet tube.
Measurement:
between 1/8″ to 1/2″ (2 mm to 12 mm)
63. Tighten the clamp.
Writer: EL

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FINAL STEPS
64. Reconnect all previously removed cables to the negative (ground) battery terminals if applicable.
65. Start the engine and check for leaks of the exhaust system and proper operation.
66. Check for diagnostic troubleshooting code related to the after-treatment system, in particular, the PM
sensor and NOx sensor.
67. Using TechTool, perform a Data Reset of the components that were replaced (refer to the two
following images).
68. Disregard the dialog box that requests DPF regeneration. Do not perform the regeneration.
Writer: EL

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PACKAGING FOR RETURN
69. Indicate serial number of new SCR converter and removed SCR converter on RO.
70. Return the old SCR converter using the packaging of the new unit.
If not possible, ideally use cardboard box where SCR converter is covered, capped (reuse caps)
and protected from elements and damage during shipping.
Tag part with RO and VIN info.
Writer: EL

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Part 2- VOLVO 9700 VEHICLES
You will find in Part 1 of this bulletin, useful information such as the diffuser removal/installation
procedure, strap installation, SCR converter insulating blanket installations, NOx sensor installation,
among others.
In complement to Part 1, please refer to the document listed below, available on Impact.
IDENTITY
ID/OPERATION
TITLE
129601506
2586-03-02-01
Aftertreatment Selective Catalytic Reduction (SCR) Catalyst,Replacement
FINAL STEPS
1. Reconnect all previously removed cables to the negative (ground) battery terminals if applicable.
2. Start the engine and check for leaks of the exhaust system and proper operation.
3. Check for diagnostic troubleshooting code related to the after-treatment system, in particular, the PM
sensor and NOx sensor.
4. Using TechTool, perform a Data Reset of the components that were replaced (refer to the two
following images).
Writer: EL

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5. Disregard the dialog box that requests DPF regeneration. Do not perform the regeneration.
PACKAGING FOR RETURN
6. Indicate serial number of new SCR converter and removed SCR converter on RO.
Writer: EL

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7. Return the old SCR converter using the packaging of the new unit.
If not possible, ideally a cardboard box where SCR converter is covered, capped (reuse caps) and
protected from elements.
Tag part with RO and VIN info.
Writer: EL

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PARTS / WASTE DISPOSAL
Return the defective SCR converter to Prevost.
ESTIMATED TIME
The time required to perform this special bulletin is approximately:
Prevost vehicles
10 hours
Volvo 9700
3 hours
OTHER
VBC Bulletin
N/A
Fail Code
04.04-1
Defect Code
09
Syst. Count
B
Causal Part
21970125
Access all our Service Bulletins on
http://techpub.prevostcar.com/en/
or scan the QR-Code with your smart phone.
Prevost engages in a continuous program of testing and evaluating to provide the best possible product. Prevost, however, is not
committed to, or liable for updating existing products.
Writer: EL