GASKET 8B3410 - Caterpillar

Scheduling a Top End Overhaul
Top end overhauls are scheduled according to the recession of the exhaust valve stems. This measurement provides an accurate indication of the rate of valve wear. This measurement can be used to predict when a cylinder head requires replacement. For more information, refer to this Operation and Maintenance Manual, "Valve Stem Projection - Measure/Record" topic.Note: The generator or the driven equipment may also require service when the engine overhaul is performed.Top End Overhaul Information
A top end overhaul involves servicing the cylinder heads and turbochargers. Also, some other engine components are inspected.Top end overhauls require more tools than preventive maintenance. The following tools are needed for restoring the engine to factory specifications:
Torque wrenches
Dial indicators
Accurate measurement tools
Cleaning equipment
Rebuilding equipmentCat dealers are equipped with these tools. Cat dealers can provide a flat rate price for a top end overhaul.Unexpected problems may be found during a top end overhaul. Plan to correct these problems, if necessary.
Build up in the cylinders from excessive oil consumption
Build up in the cylinders from contamination of the fuel
Plugging of the aftercooler from coolant that is poorly maintained
Plugging of the aftercooler from contamination of the inlet air
Degradation of the oil cooler from hydrogen sulfide in the fuelInspect the following components according to the instructions that are in Caterpillar reusability publications. Refer to Guidelines for Reusable Parts and Salvage Operations, SEBF8029, "Index of Publications on Reusability or Salvage of Used Parts".Your Cat dealer can provide these services and components. Your Cat dealer can ensure that the components are operating within the appropriate specifications.If you elect to perform an overhaul without the services of a Cat dealer, be aware of the following recommendations.The following definitions explain the terminology for the services that are performed during an overhaul:Inspect - Inspect the components according to the instructions that are in Caterpillar reusability publications. Refer to Guidelines for Reusable Parts and Salvage Operations, SEBF8029, "Index of Publications on Reusability or Salvage of Used Parts". The guidelines were developed in order to help Caterpillar dealers and customers to avoid unnecessary expenditures. New parts are not required if the existing parts can still be used, reconditioned, or repaired. If the components are not in the reusability guidelines, refer to the Service Manual, "Specifications" module.Rebuild - The component can be reconditioned in order to comply with reusability guidelines.Replace - The service life of the part is exhausted. The part may fail before the next maintenance interval. The part must be replaced with a part that meets functional specifications. The replacement part may be a new part, a CAT remanufactured part, a rebuilt part, or a used part. Some worn components may be exchanged with your Cat dealer. Consult your Cat dealer about repair options for your engine.Replacing of Components
Note: The cylinder head may be rebuilt, when possible.Replace the following components during a top end overhaul.
Cylinder heads and gaskets
Forward bearing of the fan drive
Hoses and clamps
Spark plugs
Spark plug wires
Water temperature regulatorRebuilding of Components
Rebuild the following components during a top end overhaul:
Gas regulator
Starting motor
Turbocharger
Water