HOSE AS 5T7123 - Caterpillar

Introduction
The problem that is identified below does not have a known permanent solution. Until a permanent solution is known, use the solution that is identified below.Problem
Caterpillar is requesting information related to recent 3500 head bolt failures that might otherwise go unreported.Resolution
Please review the survey questions in 1 and 2. Determine if sufficient documentation exist to generate a Send it Back Request (SIB).
Table 1
Site Details    
Field Contact        
Site Location        
Site Name        
Machine / Engine Details    
Machine Serial Number        
Engine Hours        
Engine Serial Number        
Engine Build Type        
Failure Details    
Failure Date        
Gasket Design        
Cylinder Number        
Bolt Location        
Table 2
Additional Details for Dealer Built Engines    
Does the Dealer track head bolt usage?        
How many uses on the failed bolt?        
Type of lubricant used at assembly?        
Types of solvents and cleaning methods?        
Any leaks at the head / block joint prior to failure?        
Does the Dealer retorque head bolts in the field?        
What torque sequence (torque turn vs. torque) and values were used?        
If the engine is cleaned in the field, what is the cleaning method?        
Comments    
   Note: Bolt location and identification varies between gasket designs. Refer to Illustrations 1 for correct cylinder head torque procedure.
Illustration 1 g03725518
(1) Typical cylinder head torque procedure with the 110-6991 Cylinder Head Gasket (Cellulose) (2) Typical cylinder head torque procedure with the 362-8264 Cylinder Head Gasket (MLS)