IK1201441 Service Bulletin/Repair Instructions

IK1201441 - Identifying the Source of Oil Seen at the Lower Flywheel Housing Area
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Countries:
CANADA, UNITED STATES Document ID: IK1201441
Availability:
ISIS, FleetISIS, IsSIR
Revision:
0
Major System:
ENGINES
Created:
8/29/2019
Current Language: English
Last Modified: 9/3/2019
Other Languages: NONE
Author:
Viewed:
Greg Scheff
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Title : Identifying the Source of Oil Seen at the Lower Flywheel Housing Area

Applies To : All A26 Engines
CHANGE LOG

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

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. This article is largely directed to

engines that are very low mileage and may still have the original factory oil in them. In some instances, other types of oils and

rust preventatives 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 #4).
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IK1201441 - Identifying the Source of Oil Seen at the Lower Flywheel Housing Area
Figure #1: Light Oil Film Present at Lower Flywheel Housing
Figure #3: Light Oil Seen with Inspection Cover Removed
Page 2 of 4
Figure #2: Light Oil Present at

Inspection Cover
Figure #4: Light Oil Collected under

Inspection Cover
SPECIAL TOOL(s) / SOFTWARE

Tool Description
Tool Number
Comments
KIT, UV LEAK DETECTION KIT
ZTSE4618
Complete Leak Detection Kit
SERVICE PARTS INFORMATION
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IK1201441 - Identifying the Source of Oil Seen at the Lower Flywheel Housing Area
Page 3 of 4
N/A
REPAIR STEP(s)
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 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 flourescent green color is seen in the oil anywhere (Example Figure #5), proceed with neccessary engine

repairs per the Engine Service Manual to correct the leak

2. If no florescent green is seen anywhere, then the visible oil seen is not from the engine and no engine repair is needed.
Figure #5: Example of dye's reaction to the UV light
SUGGESTED NEXT STEP WHEN NO GREEN DYE IS DETECTED

3. For new or very low mileage engines with this complaint, and no dye was detected on the previous steps then it it

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
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IK1201441 - Identifying the Source of Oil Seen at the Lower Flywheel Housing Area
Page 4 of 4
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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10/2/2019

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