NHTSA ID Number: 10153346
Manufacturer Communication Number: Sp18-39A
TSB/Document Date: 2019-02-19
Summary
This Special Bulletin explains how to perform the replacement of the SCR tank, when authorized.
Release
Page
11.2018
11.2020
1
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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
Special Bulletin
SP18-39A
Date
Expiration
Release
Page
11.2018
11.2020
1
13(37)
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
Special Bulletin
SP18-39A
Date
Expiration
Release
Page
11.2018
11.2020
1
14(37)
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
Special Bulletin
SP18-39A
Date
Expiration
Release
Page
11.2018
11.2020
1
15(37)
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
Special Bulletin
SP18-39A
Date
Expiration
Release
Page
11.2018
11.2020
1
16(37)
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
Special Bulletin
SP18-39A
Date
Expiration
Release
Page
11.2018
11.2020
1
17(37)
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
Special Bulletin
SP18-39A
Date
Expiration
Release
Page
11.2018
11.2020
1
18(37)
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
Special Bulletin
SP18-39A
Date
Expiration
Release
Page
11.2018
11.2020
1
19(37)
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
Special Bulletin
SP18-39A
Date
Expiration
Release
Page
11.2018
11.2020
1
20(37)
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
Special Bulletin
SP18-39A
Date
Expiration
Release
Page
11.2018
11.2020
1
21(37)
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
Special Bulletin
SP18-39A
Date
Expiration
Release
Page
11.2018
11.2020
1
22(37)
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
Special Bulletin
SP18-39A
Date
Expiration
Release
Page
11.2018
11.2020
1
23(37)
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
Special Bulletin
SP18-39A
Date
Expiration
Release
Page
11.2018
11.2020
1
24(37)
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
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TSB/Document ID: Sp18-39A
Replacement Service Bulletin Number:
MFR Communication Date: 2018-12-10
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE AND ENGINE COOLING
MFR Component System:
MFR Component Subsystem:
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