IK0900077 Service Bulletin/Repair Instructions

IK0900077 - IC Bus, Fuel Fired Engine Coolant Heaters
Page 1 of 2
Countries:
BAHAMAS, BOLIVIA, BELIZE, CHILE, TAIWAN,

COLOMBIA, COSTA RICA, DOMINICAN REPUBLIC,

ECUADOR, EL SALVADOR, TRINIDAD AND TOBAGO, Document

UNITED STATES, URUGUAY, VENEZUELA, ARUBA,

IK0900077

ID:

NICARAGUA, PERU, PUERTO RICO, Curaçao, GUAM,

GUATEMALA, GUYANA, HAITI, HONDURAS,

JAMAICA, KOREA, SOUTH KOREA, PANAMA
Availability: ISIS, Bus ISIS, IsSIR
Revision: 3
Major

System:
COOLING
Created:
12/5/2012
English
Last

Modified:
7/17/2018
Author:
Brandon

Akridge
Current

Language:
Other

NONE

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Title : IC Bus, Fuel Fired Engine Coolant Heaters

Applies To : AE, BE, CE, and RE Bus Models
CHANGE LOG

Please refer to the change log text box below for recent changes to this article:

07/17/18 - Update diog link

10/12/2015 - Initial Article Release

11/4/2015 - Author updated for Feedback purposes



DESCRIPTION

Optional fuel fired engine coolant heaters may require the fuel system to be primed prior to use.

Option Codes:

49BRM

HEATER, ENGINE COOLANT Fuel Fired, Espar, 17,000 BTU, Mounted Forward of Rear Wheel Pocket, with Exhaust Exit Out left side, AFT

of Wheel Pocket

49WNS

HEATER, ENGINE COOLANT Fuel Fired, Espar, 17,000 BTU, With Exhaust Exit Ahead of Rear Axle

49EAS

HEATER, ENGINE COOLANT Fuel Fired, Espar, 42,000 BTU, with Exhaust Exit Ahead of Rear Axle

49GDM

HEATER, ENGINE COOLANT Fuel Fired, Webasto Scholastic, 45,000 BTU, With Exhaust Exit Under Rear Bumper

49GWX

HEATER, ENGINE COOLANT Fuel Fired, Webasto Scholastic, 45,000 BTU, With Exhaust Exit Out Left Side

49MRB

HEATER, ENGINE COOLANT Fuel Fired, Espar, 42,000 BTU, with Exhaust Exit Under Bumper, Mounted Aft of Rear Axle, Left Side

The coolant heater fuel filter is filled during the manufacturing assembly process which allows sufficient fuel to test fire the unit. The test fire,

or operation validation process, will result in air in the fuel system as the fuel tank fuel level will be below the pickup tube level.

SYMPTOMS

• Unit will not start and run when received from the manufacturing.

• Repeated failed start attempts resulted in system shut down requiring system to be reset (Espar).

RESOLUTION

• Prior to validating fuel fired heater operation, remove fuel filter housing and fill with clean fuel.

• Ensure fuel tank is filled to above 1/4 of a tank.

• Reset system and timer as required by the manufacturer.
https://evalue.internationaldelivers.com/service_kb/DocTool/ArticleViewer.aspx?ControlID... 8/1/2018
IK0900077 - IC Bus, Fuel Fired Engine Coolant Heaters
Page 2 of 2
• Follow engine coolant heater manufacturer instructions to fire system.

• Once running, run unit for a minimum of 30-40 minutes to purge all air from the fuel system.

NOTE:

Priming the fuel system would be considered part of the dealer pre-delivery process and would not be covered under standard warranty coverage.
ADDITIONAL RESOURCES

Espar:

Espar Diog.
Webasto:

Webasto Installation/Operation Instructions

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Copyright © 2018 Navistar, Inc.
https://evalue.internationaldelivers.com/service_kb/DocTool/ArticleViewer.aspx?ControlID... 8/1/2018

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