NHTSA ID Number: 10054637
Manufacturer Communication Number: IK-0900012
TSB/Document Date: 2014-02-11
Summary
IKNOW: SOME VEHICLES MAY EXPERIENCE A FAN BLADE FAILURE. THIS COULD BE CAUSED BY BREAKAGE AT THE END OF THE BLADE OR WHERE THE BLADE IS MOLDED TO THE CENTER SECTION OF THE FAN ASSEMBLY. *JS UPDATED 3/11/2014 *JS
IK0900012 - Fan Blade Failures
Page 1 of 3
SB-10054637-5153
Countries:
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IK0900012
MEXICO, PUERTO RICO,
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ISIS
Revision: 2
COOLING
Created:
10/1/2007
English
Last
Modified:
12/13/2013
Français, Español,
Author:
Thomas
Hoffmeister
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Title : Fan Blade Failures
Applies To : 5500i 5600i 5900i 7600 7700
It is important to understand what causes a fan blade failure while changing the fan blade. The two most common failures
are breakage at the end of the blade or where the blade is molded to the center section of the fan assembly.
PARTS INFORMATION
For 5000i models built with a Pre-2007 engine, the part number is 3625639C1.
For 5000i models built with a post-2007 engine, the part number is 3820083C1.
For 7600 and 7700 models, the part number is 3625639C1.
Service procedure
To avoid personal injury or death, disconnect battery cables so engine can not be started while working in the fan
area.
Give the engine time to cool down before working on or around the fan.
https://evalue.internationaldelivers.com/service_kb/DocTool/ArticleViewer.aspx?ControlID... 1/2/2014
IK0900012 - Fan Blade Failures
Page 2 of 3
Figure 1. Typical Fan Blade Tip Failures
The fan blade will crack at the tip when the blade comes in contact with a stationary component (radiator shroud, engine
idler, bracket, etc.) or loose foreign material (small rocks or stones).
1. Check front and rear engine mounts to ensure they are tight and that the insulators are in good condition.
2. Determine if the vehicle been operating in severe terrain, which could cause the frame to twist and flex?
3. Check the fan shroud to make sure that it is not loose, or pieces of it are hanging in the path of the fan blade travel.
4. Check the fan blade to make sure it is the correct one for the vehicle.
5. Correct any problems found from above inspection.
https://evalue.internationaldelivers.com/service_kb/DocTool/ArticleViewer.aspx?ControlID... 1/2/2014
IK0900012 - Fan Blade Failures
Page 3 of 3
Figure 2. Typical Fan Blade Root Failure
Cracks at the fan blade root are usually caused by the fan speed exceeding its rated RPM.
1. Check engine RPM to make sure it is not operating over 2300 RPMs.
2. Improper downshifting can also cause fan overspeed.
3. In the event that the overrun condition can not be corrected, a new fan blade has been designed to operate up to 3300
RPMs.
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Copyright © 2014 Navistar
, Inc.
https://evalue.internationaldelivers.com/service_kb/DocTool/ArticleViewer.aspx?ControlID... 1/2/2014
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TSB/Document ID: IK-0900012
Replacement Service Bulletin Number:
MFR Communication Date: 2014-01-08
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE AND ENGINE COOLING:COOLING SYSTEM:FAN
MFR Component System:
MFR Component Subsystem:
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