FT4869R1

MQR 7621-1762 : Service Solution (Shim)
Surge tank cover Chafing Components
Case Manager: Jeffrey Vegh
2020-09-08
Revision 01
Instructions, 2020-04-09
MQR, Jeffrey Vegh
1
Interferences & Solutions
Agenda
Subjects
1.
Contract (Vehicles Affected)
2.
SRT (repair time / scenario)
3.
Bill of Material
4.
Location of rework
5.
Solution required (Sight Glass contact : Yes / No)
6.
Rework Instructions
7.
Installation
8.
Validation
Instructions, 2020-04-09
MQR, Jeffrey Vegh
2
1) All buses from the following list:
Order Number
Total Qty
L998
LA67
LA68
LA69
LB45
LB28
LB75
97
200
45
40
80
150
40
AFFECTED CONFIGURATION
Instructions, 2020-04-09
MQR, Jeffrey Vegh
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2) SRT :
Level 1 = 40min
Level 2 = 20min
NOT-AFFECTED CONFIGURATION
(L729/L738/L777/L859/L860/L937)
3) Bill of Material
Level 1 (100% of 652 buses = 652 kits)
Item
1
2
3
Part #
N34792
N28220
N43233
QTY
Units
8
4
2
pc
pc
pc
Description
WASHER FLAT M8 SS
Lock Washer M8 SS DIN 128
NUT HEX M8 FLANGED WITH INSERT
Level 2 (2% of 652 buses = 13 kits)
Item
QTY
Units
Description
4
5
6
680796
N28219
N32920
2
4
2
LF
pc
LF
ADHESIVE DOUBLE SIDE TAPE 0.045 X 0.75IN
WASHER FLAT M8 OVERSIZE SS
TAPE NEOPRENE 5/8"W X 1/4"T
7
91287A155 (McMaster)
4
pc
M8 x 1.25 mm Thread, 35 mm Long, SS A2
8
Instructions, 2020-04-09
MQR, Jeffrey Vegh
4
Part #
Shop Supply (1 bottle for the total of 652 buses)
9985283
1,7
oz
Loctite 242
4) Zone of rework:
3
3
4
a) Top, Rear, Curb / Street side of Canopy.
b) Use adequate safety equipment when working on top of vehicle.
Instructions, 2020-04-09
MQR, Jeffrey Vegh
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5) Check for sight glass contact (YES see Step 6 / NO see Step 7)
a) Visual inspection of indent / grooves on Canopy
Bus with Sight glass contact
b) Once bracket is Shimmed and foam tape is applied a clearance of 3
will be achieved.
Instructions, 2020-04-09
MQR, Jeffrey Vegh
6
4 mm
6) Rework Instructions: (Sigh Glass contact ONLY)
a) Clean area with isopropyl alcohol
b) Apply double sided tape item 4 (680796) on neoprene item 6 (N32920)
c) Install as shown on pictures below
Instructions, 2020-04-09
MQR, Jeffrey Vegh
7
7) Installation Instructions (Shim) :
a) Retain indicated hardware
Discard original Lock Washer N28220
Remove hardware,
discard locknut
Retain original flat washer N28219
Retain original screw
N28668
Original Installation
New Lock Washer N28220
Original flat washer N28219
Add new Washer N34792
New proposed installation
2x 2,28MM thk (Shim)
Instructions, 2020-04-09
MQR, Jeffrey Vegh
8
b) Installation Instructions:
Reinstall original screw N31413
Retain original flat washer N29011
install new Lock Nut N43233
Torque 27.2 ± 2 Nm
Add Torque seal
2 places
Torque 27.2 ± 2 Nm +
Loctite 242 (on threads)
Add Torque seal
Note: Due to tolerance stack up of the bonded plate holding the Rivnut in which this
screw is secured, a longer screw could be required. (ie; 91287A155 (McMaster M8x35))
Validate screw engagement is 8mm -1/+xx (measure gap once screw begins to enter
threaded insert, as show)
4 places
Instructions, 2020-04-09
MQR, Jeffrey Vegh
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8) Validation : With or Without sigh glass contact
Gain of 4mm to avoid contact of the following components;
b)
c)
d)
e)
Rubber Tube Chafing on Canopy
Fitting and Rubber Tube Chafing on Canopy
Tyton Chafing on Canopy (relocate if required, as shown)
P-Clamp Chafing on Canopy
b)
d)
e)
b)
d)
c)
Instructions, 2020-04-09
MQR, Jeffrey Vegh
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Actual Canopy profile
c)