SB 3149

Subject: Engine Door Debonding Inspection
Field change Program:
Service Bulletin
Coach Section:
03-Body
Bulletin Number: Revision:
3149
A
P/N:
03-31-4155
Date:
02/10/2021
Type:
Service Information
Application:
Coach Model
Model Year
VIN
J4500
2018 - 2019
67865, 68378, 68380, 68386, 68391 - 68393, 68396, 68399,
68402, 68403, 68408, 68409, 68411, 68413 - 68416,
68420 - 68425, 68427 - 68434, 68436 - 68449, 68451 68456, 68461 - 68465, 68468, 68475, 68485, 68492,
68494 - 68501, 68509, 68519, 68521, 68522, 68525, 68528,
68530, 68533, 68537 - 68542, 68545, 68546, 68550, 68552,
68553, 68555, 68563, 68564, 68568 - 68572, 68574 68576, 68587 - 68590, 68602, 68614, 68617, 68619 68621, 68626 - 68629, 68631, 68637, 68639, 68642, 68647,
68648, 68653, 68666, 68668, 68675, 68676, 68687 - 68689,
68692, 68693, 68697 - 68701, 68703 - 68705, 68711,
68712, 68719, 68721, 68723 - 68727, 68735 - 68739,
68742 - 68745, 68747, 68748, 68750 - 68762, 68770,
68773, 68774, 68784, 68785, 68788, 68794, 68805, 68818,
68821, 68825, 68829, 68852 - 68854, 68856 - 68858,
68860 - 68865, 68867, 68874, 68878, 68882, 68887, 68888,
68890 - 68894, 68896, 68897, 68902, 68911 - 68914,
68924, 68925, 68931, 68932, 68934, 68936, 68962, 68966 68968, 68982, 68985, 68989, 68991, 68994 - 68996, 68999,
69000, 69003, 69004, 69008, 69009, 69011, 69012, 69014 69029, 69031 - 69048, 69053, 69054, 69056, 69058, 69063,
69072, 69073, 69078 - 69081, 69086, 69087, 69090, 69092,
69096 - 69099, 69103, 69104, 69107, 69109, 69111,
69150 - 69152, 69161, 69162, 69164, 69165, 69171, 69172,
69178, 69208, 69209, 69211, 69217, 69219 - 69222, 69233,
69431, 69469
SI 3149
Engine Door Debonding Inspection
Read this entire procedure before beginning work.
Use Safe Shop Practices at All Times.
To avoid personal injury:
a. Proper Personal Protective Equipment (PPE) must be worn. Safety glasses and
protective gloves are required for working with DEF Fluid.
b. Turn the main battery disconnect switch to the OFF position.
c. Ensure that both the front and the rear wheels are chocked.
d. Position the ENGINE RUN and ENGINE START switches on the engine
compartment remote control box to the OFF position.
e. Allow enough time for components to cool down prior to working in the engine
compartment.
Motor Coach Industries Ltd.
Page 2 of 5
SI 3149
Engine Door Debonding Inspection
1.0
Description
This bulletin outlines steps to inspect engine compartment door de-bonding.
2.0
Material requirements
Refer to Section 5.1.
3.0
Special tools
Spray lubricant, MCI P/N: 23-01-0020.
4.0
Inspection
Open the engine door using the latch behind the curbside service door.
Rotate the lever
counterclockwise
Motor Coach Industries Ltd.
Page 3 of 5
SI 3149
Engine Door Debonding Inspection
Inspect to see if the fiberglass section of the door is intact to the metal frame.
If the fiberglass section of the door is intact to the metal frame, continue to Section 5.0.
Otherwise, contact your MCI representative or nearest MCI service center to rework the
door using internal procedure P03-267.
Good
Bad
Fiberglass section is separated
from metal frame. Contact MCI
representative or nearest MCI
service center for rework
Motor Coach Industries Ltd.
Fiberglass section is intact to
the metal frame. Continue to
Section 5.0
Page 4 of 5
SI 3149
Engine Door Debonding Inspection
5.0
Replacing shoulder screws
This section of the procedure is not required if the fiberglass section of the door is
observed to be de-bonded from the metal frame.
5.1
ITEM
1
5.2
Material requirements
PART NO
19-01-2385
QTY
2
U/M
EA
DESCRIPTION
Screw- Shoulder, .5X3.25 SS
Rework
On the driver side, remove the shoulder screw, lock nut bonding short link assembly to
the frame tube. Save the lock nut for later use and discard the shoulder screw.
Remove and save the lock nut.
Discard the shoulder screw
Re-install the short link using a new shoulder screw, MCI P/N: 19-01-2385, and existing
lock nut. Torque the shoulder screw to 21 FT-LBS.
Re-install short link assembly
using shoulder screw, 19-012385, and existing nut
Repeat the steps on the curbside.
Apply spray lubricant, MCI P/N: 23-01-0020, to hinge joints.
Lubricate hinge joints regularly following the service intervals specified in MCI
maintenance manual.
End of the procedure
Motor Coach Industries Ltd.
Page 5 of 5