NHTSA ID Number: 10167216
Manufacturer Communication Number: IK1201441
TSB/Document Date: 2019-11-05
Summary
Identifying the Source of Oil Seen at the Lower Flywheel Housing Area. Only models equipped with Allison Transmission and International
A26 or Cummins L9 engines
IK1201441 - Identifying the Source of Oil Seen at the Lower Flywheel Housing Area
Page 1 of 5
Countries:
CANADA, UNITED STATES Document ID: IK1201441
Availability:
ISIS, FleetISIS, IsSIR
Revision:
1
Major System:
ENGINES
Created:
8/29/2019
Current Language: English
Last Modified: 10/18/2019
Other Languages: NONE
Author:
Viewed:
Greg Scheff
1942
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Title : Identifying the Source of Oil Seen at the Lower Flywheel Housing Area
Applies To : All low mileage A26 and Cummins engines equipped with an Allison Transmission
CHANGE LOG
Please refer to the change log text box below for recent changes to this article:
10/18/2019 - Added information for Cummins engines
09/03/2019 - Initial Article Release
DESCRIPTION
This document will aid the user in locating the source of oil seen at the lower flywheel housing area. Reports of suspect rear
crankshaft seal leaks from the field have been received on new trucks with very low mileage equipped with Allison
Transmissions. This article is largely directed to engines that have very low mileage and may still have the original factory oil in
them. In some instances, lubricants are used in new transmission mating components that when warmed up, will run off and can
give the appearance of a leaking rear crankshaft seal. This document will serve as an aid in determining if a rear crank seal is
actually at fault.
SYMPTOM(s)
Customer Observations or Concerns:
The customer or dealer may observe a light coating of oil at the lower flywheel housing and or small drops of fluid on the ground
under the flywheel housing (Figure #1 through #5).
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IK1201441 - Identifying the Source of Oil Seen at the Lower Flywheel Housing Area
Figure #1: A26 Light Oil Film Present at Lower Flywheel Housing
Figure #3: A26 Light Oil Seen with Inspection Cover Removed
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Figure #2: A26 Light Oil Present at
Inspection Cover
Figure #4: A26 Light Oil Collected under
Inspection Cover
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IK1201441 - Identifying the Source of Oil Seen at the Lower Flywheel Housing Area
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Figure #5: Low Mileage Cummins L9
SPECIAL TOOL(s)
Tool Description
Tool Number
Comments
KIT, UV LEAK DETECTION KIT
ZTSE4618
Complete Leak Detection Kit
REPAIR STEP(s) FOR A26 ENGINES
The original factory fill oil shipped with all Navistar Big Bore Engines has green dye
added to it for leak detection purposes used at the assembly plant.
1. For A26 engines new enough to have the original factory fill oil in them, perform the following steps while using the UV
light from the ZTSE4618 Leak Detection Kit
◦ Shine the light up through the lower flywheel housing inspection opening, and on the oil seen externally on the
housing
◦ If any fluorescent green color is seen in the oil anywhere (Example Figure #6), proceed with necessary engine
repairs per the Engine Service Manual to correct the leak
2. If no fluorescent green is seen anywhere, then the visible oil seen is not from the engine and no engine repair is needed.
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IK1201441 - Identifying the Source of Oil Seen at the Lower Flywheel Housing Area
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Figure #6: Example of dye's reaction to the UV light
SUGGESTED DIRECTION FOR CUMMINS ENGINES OR WHEN NO GREEN DYE
IS DETECTED ON A26 ENGINES
Cummins engines may not have dye in the factory filled oil so the UV light test method above does not apply
3. For new or very low mileage Cummins engines with this complaint, and no dye was detected on the previous steps for
A26 then it is recommended to do the following.
◦
◦
◦
◦
Verify the leak is not transmission fluid
Clean the oil from the housing and all area's as best as possible
Return the truck to service and instruct the owner / operator to monitor the area for approximately 10,000 miles
Return to the dealer for service if the leak returns
WARRANTY INFORMATION
Warranty Claim Coding:
Refer to the Warranty Coding Manual for Group and Noun Codes.
Standard Repair Time(s):
Refer to the SRT Manual for Repair Times
OTHER RESOURCES
Master Service Information Site
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Copyright © 2019 Navistar, Inc.
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- 6X better wear protection on critical engine parts than...
- 1.3X better sludge protection than industry standards*
- 3X Stronger against viscosity breakdown than leading full...
- Protection for 10,000 miles between oil changes
- Meets or exceeds the following specifications: API SP/SN...
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TSB/Document ID: IK1201441
Replacement Service Bulletin Number:
MFR Communication Date: 2019-10-18
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE AND ENGINE COOLING
MFR Component System:
MFR Component Subsystem:
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