NHTSA ID Number: 10171329
Manufacturer Communication Number: LI4774E
TSB/Document Date: 2020-02-10
Summary
Bad torque sequence and engine rail flatness out of tolerance at fuel tank mounts created preload in the chassis leading to premature failure.
INFORMATION LETTER
REFERENCE:
Nova Bus
Manuals
SECTION:
11: Fuel & exhaust
RS NO:
MQR 7621-1508
LI4774E
APPLICATION DEADLINE:N/A
EFFECTIVE IN PROD.: LC32 (2019MR)
SUBJECT:
Fuel tank cradle
JUSTIFICATION:
Bad torque sequence and engine rail flatness out of tolerance at fuel tank mounts
created preload in the chassis leading to premature failure.
DIRECT CHARGES
LEVEL
DESCRIPTION
1
Procedure to change hardware and execute good torque sequence.
2
–
TIME
LABOUR
MATERIAL
Client
Client
40 min
–
–
–
MATERIAL
QTY
PART NO
REV.
DESCRIPTION
REPLACES PART N°
LEVEL 1
4
N87918
–
NUT LOCK HFR M8 SS
–
4
N30731
4
N44885-03
A
WASHER FLAT M8 SS HD DIN7349
–
C
SCREW M8X30 FL SSA2 C70 D6921
–
–
–
–
LEVEL 2
–
–
To order, please contact Prevost Parts by phone at 1-800-771-6682, by fax at 1-888-668-2555 or by email at
prevostparts.commandes@volvo.com. 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
2020JA20
APPROVED BY:
NQF772002 VERSION 3
CHANGE DESCRIPTION
Initial release
Jean-Nicolas Fournier
WRITTEN BY
Annie St-Jacques
Digitally signed by Jean-Nicolas Fournier
DN: cn=Jean-Nicolas Fournier, o=Nova Bus, email=jeannicolas.fournier@volvo.com, c=CA
Date: 2020.01.13 09:48:16 -05'00'
PAGE 1 OF 4
INFORMATION LETTER
CLIENT
Chicago Transit Authority - CTA - Illinois
ORDER
L773
ROAD NUMBER
LI4774E
VIN (2NVY/4RKY...)
QTY
FROM
TO
FROM
TO
—
—
L82JXD4500429
L82J6D4500430
2
Chicago Transit Authority - CTA - Illinois
L811
7902
7949
L82J6E4500509
L82J4E4500556
48
Chicago Transit Authority - CTA - Illinois
L837
7950
7999
L82J6E4500655
L82J1E4500708
50
Chicago Transit Authority - CTA - Illinois
L847
8000
8049
L82J1E4500773
L82JXE4500822
50
Chicago Transit Authority - CTA - Illinois
L848
8050
8099
L82JXF4500823
L82J1F4500872
50
Chicago Transit Authority - CTA - Illinois
L849
8100
8149
L82J5F4500874
L82J3F4500923
50
Chicago Transit Authority - CTA - Illinois
L850
8150
8199
L82J5F4500924
L82J6G9775013
50
Chicago Transit Authority - CTA - Illinois
L943
8200
8324
L82JXG9775225
L82J3G9775406
125
Chicago Transit Authority - CTA - Illinois
LB58
8325
8349
L82J7J9776906
L82J8J9776946
25
PAGE 2 OF 4
NQF772002 VERSION 3
INFORMATION LETTER
LI4774E
FOLLOW YOUR INTERNAL SAFETY PROCEDURES.
PROCEDURE
For information on hoisting and towing of the vehicle, see section 18:
in the Nova Bus
maintenance manual. Use appropriate hoisting equipment for your protection and to prevent damage to
the vehicle.
It is recommended to execute this procedure with a low level fuel tank.
1.1.
Raise the vehicle
1.2.
Locate the fuel tank
Fuel tank
with cardle
Figure 1 - Fuel Tank Location
PAGE 3 OF 4
NQF772002 VERSION 3
INFORMATION LETTER
LI4774E
1.3.
Install a support device to support the fuel tank craddle before executing the next operations.
1.4.
Locate the 6 mounting points of the fuel tank cradle (see Figure 2).
27 Nm +/- 2 Nm
27 Nm +/- 2 Nm
3
2
1
93 Nm +/- 7 Nm
6
93 Nm +/- 7 Nm
5
4
93 Nm +/- 7 Nm
93 Nm +/- 7 Nm
Figure 2 - Mounting Points Locations and Torque Values
1.5.
Loosen the screws at mounting points 1 - 4 - 5 and 6.
1.6.
Remove and discard the 4 screws, washers and lock nuts at mounting points 2 and 3.
1.7.
Verify the fuel tank cradle position by making sure that the cradle is firmly pressed against the structure at
mounting points 1, 2 and 3 and that the cradle holes and the structure holes are aligned to avoid any damage
to the bolts threads during the assembly.
1.8.
Torque the screw at mounting point 1 to the torque value show in Figure 2.
1.9.
Install the new 4 screws (N44885-03), washers (N30731) and lock nut (N87918) at mounting points 2 and 3
and apply the torque value show in Figure 2.
1.10.
Finally, torque the screw at mounting point 4, 5 and 6 to the torque value show in Figure 2.
1.11.
The vehicle can return in service.
PAGE 4 OF 4
NQF772002 VERSION 3
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- 3X Stronger against viscosity breakdown than leading full...
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- Meets or exceeds the following specifications: API SP/SN...
- Formulated for engines with 75,000 miles or more, Valvoline...
- Delivers 20% better wear protection and 15% better sludge...
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TSB/Document ID: LI4774E
Replacement Service Bulletin Number:
MFR Communication Date: 2020-01-14
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: FUEL SYSTEM, GASOLINE
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
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