BS4840E

BS4840E
SERVICE BULLETIN
REFERENCE:
Nova Bus Manuals
SECTION:
09: Engine cooling system
RS NO:
MQR 7621-1960
SUBJECT:
Charge air cooler (CAC) pipings
JUSTIFICATION:
Improved sealing of the joints of the charge air cooler piping.
LEVEL
1
APPLICATION DEADLINE: 2021SE01
CLAIM REFERENCE NUMBER: WB-4840
DIRECT CHARGES
DESCRIPTION
Replace the CAC clamps with the new constant-tension clamps.
2
–
TIME
LABOUR
MATERIAL
Nova Bus
Nova Bus
2h
–
–
–
MATERIAL
QTY
PART NO
REV.
DESCRIPTION
REPLACES PART N°
N99800
–
Constant-tension clamp
–
–
–
–
–
LEVEL 1
16
LEVEL 2
–
Materials will be available within 38 days once your order has been placed. To order, please
contact Prevost Parts by phone at 1‑800‑771‑6682, by fax at 1‑888‑668‑2555 or by email at
[email protected]. Specify document number, quantity of parts required and shipping address.
DISPOSAL OF PARTS
REMOVED PARTS ARE:
DISCARDED
*
RETAINED
Yes
–
* Dispose of the unused parts and the defective parts in
accordance with local environmental standards in effect.
REVISION HISTORY
REV.
DATE
NR
2020JL02
APPROVED BY:
CHANGE DESCRIPTION
Initial release
Jean-Nicolas Fournier
NQF772001 VERSION 3
WRITTEN BY
André Pelletier
Digitally signed by Jean-Nicolas Fournier
DN: cn=Jean-Nicolas Fournier, o=Nova Bus, [email protected], c=CA
Date: 2020.07.02 09:43:17 -04'00'
PAGE 1 OF 5
SERVICE BULLETIN
CLIENT
ORDER
ROAD NUMBER
BS4840E
VIN (2NVY/4RKY...)
QTY
FROM
TO
FROM
TO
L82JXG9775225
L82J3G9775406
125
Chicago Transit Authority - CTA - Illinois
L943
8200
8324
Chicago Transit Authority - CTA - Illinois
LB58
8325
8349
L82J7J9776906
L82J8J9776946
25
Calgary Transit - Alberta
LB85
8355
8362
L82K9J9776916
L82K6J9776923
8
Calgary Transit - Alberta
LB91
8363
8394
L82K3K9777030
L82K1K9777074
32
PAGE 2 OF 5
NQF772001 VERSION 3
SERVICE BULLETIN
BS4840E
WARNING
FOLLOW YOUR INTERNAL SAFETY PROCEDURES.
WARNING
This vehicle contains an electrochemical power storage device and high-voltage cables that can cause
serious, even fatal, physical harm from electric shock or chemical burns. It is the customer’s responsibility
to read the manufacturer’s documentation and to be aware of the risks associated with the system. See your
manual section 10: BAE Hybrid Propulsion System. Failure to comply with these instructions and electrical
safety measures may result in injury or death, as well as severe damage to the vehicle.
WARNING
The starting circuit is cut when the mode start switch on the engine control unit is in the neutral position
(center). When servicing the engine compartment, flip the switch to this position to prevent accidental starting
of the engine compartment. It is also recommended to lock out the switches to prevent accidental starting.
PROCEDURE
1.1.
Park the vehicle on an even surface with the transmission on neutral.
1.2.
Apply the parking brake and set the master control switch to the stop position.
1.3.
Set the battery disconnect switch in the battery compartment to the off position.
PAGE 3 OF 5
NQF772001 VERSION 3
BS4840E
SERVICE BULLETIN
x2
x4
x2
x2
x2
x2
x2
Figure 1 - CAC pipes Clamp Locations
REMARQUE
•
•
•
•
•
•
•
•
Never use an impact wrench to tighten the clamps.
For the tightening process, the tightening torque (N•m) and speed (rpm) have to be controlled. Avoid
high-speed tooling. Increase of tightening speed may lead to seizing/jamming.
The constant torque hose clamp is designed to automatically adjust its diameter to compensate for the
normal expansion and contraction of hose and tubing during vehicle operations and shutdown.
If clamp is tightened above recommended tightening torque, this will not increase pull-off force and seal
ability of the clamp proportionally to the applied torque.
If the tightening torque is exceeded, there is the danger of permanent damage to the clamp or hose (e.g.
failure of the clamp at reassembly or leakage).
Strongly avoid in any case multiple retightening of the clamp (risk of hose damage).
Strongly avoid in any case overtightening in means of torque and speed (risk of permanent damage to
clamp and systems).
Strongly avoid in any case fully opening of the clamp and remounting of the band to the housing (if
opened, replacing of the clamp is recommended).
PAGE 4 OF 5
NQF772001 VERSION 3
SERVICE BULLETIN
BS4840E
1.4.
Remove a clamp.
1.5.
Clean the surface of the silicone hose where the new clamp will be installed.
1.6.
Apply a lubricant such as P-80, N74253, between the new clamp and the pipe. This will prevent the clamp
from gripping the hose when tightening and applying the torque properly.
1.7.
Orient the new clamp to facilitate maintenance and tighten it as close as possible to the raised bead. Apply
a torque of 13.5 ±2 N•m (10 ±1.5 lb-ft).
1.8.
Repeat for all clamps shown in Figure 1, for a total of 16 clamps.
1.9.
Start the vehicle and let it run at fast-idle for 15 minutes.
1.10.
Apply the tightening torque of 13.5 ±2 N•m (10 ±1.5 lb-ft) again.
1.11.
Install the removed parts to do the work.
1.12.
Set the battery disconnect switch to the on position.
1.13.
The vehicle can be returned to service.
PAGE 5 OF 5
NQF772001 VERSION 3