SMB-163 – Exhaust Clamp Replacement – New Flyer

SEOCONTENT-STARTSMB-163 1 of 3
SERVICE MANUAL BULLETIN
This Service Manual Bulletin is prepared by the Publications Department of New Flyer Industries
Canada ULC. Refer to details below.
The New Flyer vehicles described in this manual may be protected by one or more
patents and design applications or registrations in the United States and Canada,
and in other countries. Refer to “Vehicle Patent Information” in this manual.
Copyright © 2016 New Flyer Industries Canada ULC
ISSUE DATE: Oct 12 2016
SMB-163
APPLICABILITY
VEHICLE LENGTH  30ft.  35ft.  40ft.  60ft.  ALL
VEHICLE TYPE
 Xcelsior®  MiDi®  Invero®
 ALL
 Low Floor  High Floor
FUEL TYPE
 Diesel  Diesel/Electric  CNG  LNG
 ALL
 Fuel Cell  Trolley/Electric  Battery/Electric
SUBJECT Exhaust Clamp Replacement
SECTION TITLE PM – PREVENTIVE MAINTENANCE
DETAILS This bulletin provides information on the procedure to replace the Seal
Clamp on the exhaust system of your New Flyer vehicle. The Seal Clamp
P/N 089275, located at the SCR to tailpipe connection, must be replaced
any time it has been loosened or every four years or 150,000 miles,
whichever occurs first.
This information supersedes any prior information on this subject
already provided in your New Flyer Service Manuals. Make this Service
Bulletin available to service personnel to inform them of changed information.
2 of 3 SMB-###
SERVICE MANUAL BULLETIN
SMB-163
The New Flyer vehicles described in this manual may be protected by one or more
patents and design applications or registrations in the United States and Canada,
and in other countries. Refer to “Vehicle Patent Information” in this manual.
Copyright © 2016 New Flyer Industries Canada ULC
1. Introduction
The seal clamp used at the connection
between the Selective Catalytic Reduction
Unit (SCR) and tailpipe is designed for
one-time use and has a finite life. The seal
clamp must be replaced any time that it
has been loosened or every four years or
150,000 miles, whichever occurs first.
1.1. Replacement
Use work platforms or scaffolding
whenever working on the vehicle rooftop.
Ensure maintenance personnel use
an approved safety harness.
To avoid personal injury, DO NOT work
on a hot exhaust system. Allow sufficient
time for the engine and exhaust
system to cool before working on the
exhaust system.
1. Gain access to the rooftop and remove the
SCR access panel. See “Fig. 1: SCR
Access Panel” on page 2.
Fig. 1: SCR Access Panel
s127626a.svg
SMB-163 3 of 3
SERVICE MANUAL BULLETIN
SMB-163
The New Flyer vehicles described in this manual may be protected by one or more
patents and design applications or registrations in the United States and Canada,
and in other countries. Refer to “Vehicle Patent Information” in this manual.
Copyright © 2016 New Flyer Industries Canada ULC
2. Remove the tailpipe seal clamp and discard
the clamp and fasteners. See “Fig. 2:
Seal Clamp Replacement” on page 3.
3. Install a new seal clamp as follows:
a. Obtain a new seal clamp, New Flyer
P/N 08927, complete with new fasteners.
b. Lightly grease the contact surface of
the clamp and joint area to prevent
binding during tightening.
c. Position the clamp so as to completely
cover the slots on the SCR outlet.
d. Insert foil gasket between mating bars.
e. Tighten the fasteners alternately and
uniformly take up the slack.
DO NOT overtighten the clamp fasteners,
otherwise damage to the clamp or
fasteners may occur. Typical installation
torque should be approximately 50
ft-lbs. (68 Nm), but not to exceed 75 ftlbs.
(105 Nm).
f. Continue to tighten the clamp until the
mating bars’ surfaces are fully touching
and the foil gasket is fully compressed.
g. Wipe away any excess grease and
wipe down area with a degreaser.
4. Check mounting clamps on the SCR
device and tailpipe to ensure parts are
securely mounted and will not cause loosening
of the seal clamp.
5. Reinstall the SCR access panel.
Fig. 2: Seal Clamp Replacement
s1268171a.svg