Failure Of Main Thrust Bearing Caterpillar


Failure Of Main Thrust Bearing

Usage:

ENGINES3116 TRUCK ENGINES (7SF, 2BK, 9GK, 8WL)

Problem:

There have been two types of failures of the 7W9416 Main Thrust Bearing reported in truck applications. The two types of failures are "wiping" and "flaking".

Wiping failures occur when the thrust bearing surface temperatures become high enough to melt the lead-tin overlay and aluminum layers of the bearing. Wiping type failures may damage the crankshaft thrust faces and require crankshaft replacement.

Flaking failures start with fatigue cracks in the aluminum layer. This can cause separation between the aluminum layer and the steel backing. Replacement of the thrust bearing is usually all that is required to a "flaking" thrust bearing failure because the crankshaft is seldom damaged.

Solution:

Caterpillar would appreciate the details of any thrust bearing failures, so we can better understand the extent and cause of this problem. We realize not all the information requested on the following page will be readily available. However, the more you can tell us about the failure, the quicker and more accurately we can resolve the problem.

PLEASE KEEP ALL FAILED THRUST BEARINGS, BUT DO NOT CLEAN THEM!

Please share this information with your Chevrolet/GMC TEPS Dealers.

Please call or fax the information on this sheet to:

Wayne D Oder (Product Analyst)
Phone: (309) 578-6986
Fax: (309) 578-7423
Engine/vehicle Identification:
Vehicle Serial Number
Vehicle Make and Model
Engine Serial Number
Engine Arrangement Number
Horsepower/rpm Rating
How is this vehicle used? (application)
GVW/GCW (Gross Weight)
Approximate miles per week
Fuel Consumption
Repairing Dealer/Customer Identification:
Dealer Code
Dealer Name
Dealer Address
Dealer Phone Number
Customer Name
Customer Address
Failure Information:
Date
Miles/SMU
Part Number
Dealer Work Order Number
Customer Complaint (debris in oil, etc.)
Parts:
Are replaced parts available for return?
Transmission And Clutch
Manufacturer
Number of speeds (gears)
Single or double plate clutch
Adjustments within specifications? (If not, how far off?)
Prior clutch/transmission repairs/adjustments (date, mileage)
Additional Comments (Help Us Understand The Failure)
Significant past repairs or engine history
Observations of the current failure
Customer maintenance practices
Oil (Brand, Grade, current or past history of debris in oil)
Any unusual operating conditions or components
External components that could effect thrust loading (front PTO)

COPYRIGHT 1993 CATERPILLAR ALL RIGHT RESERVED

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