INSERT 0.26 mm(.010 in.) oversize 4S8913 - Caterpillar

Introduction
Excessive oil consumption, not due to leaks, is the use of more than 0.95 L (1 qt) of engine oil within 379 L (100 US gal) of fuel used. However, during initial engine break-in periods between 5000 km (3000 mi) to 6000 km (4000 mi), oil consumption may exceed 1.9 L (2 qt) or more per 379 L (100 US gal) of fuel used.Probable Causes
Incorrect oil level or improper reading of oil level indicator
Improper oil viscosity
Continuous operation in hazardous conditions
Crankcase ventilation system restrictions or malfunctioning components
Valve guides and/or valve stem seals worn, or seal omitted
Piston rings broken, improperly installed, worn, or not seated properly
Piston improperly installed or piston size is incorrectly selectedTest Procedure
With the vehicle on a level surface, allow for adequate drain down time and check the engine oil level. Add engine oil as necessary to fill to the appropriate level.
Check the oil viscosity that is being used and verify that the oil is adequate for the current operating conditions.
Ensure that oil is properly maintained in continuous hazardous conditions.
Check the crankcase ventilation system for restrictions and resolve any conditions that are found.
Ream valve guides and install oversized service valves and/or valve steam oil seals if necessary.
Allow adequate time for piston rings to seat. Replace broken or worn piston rings as necessary.
Verify that the installed pistons are the correct size for the application and were installed correctly.