DASH ASSEM. 3P8581 - Caterpillar

Recommended Intervals for Top End Overhaul
A top end overhaul is recommended at the following intervals:
Table 1
Recommended Intervals for Top End Overhaul(1)
Engines with D ratings Every 148000 L (39000 US gal) of fuel or 3000 service hours
Engines with E ratings Every 91000 L (24000 US gal) of fuel or 3000 service hours
(1) Use the interval that occurs first.Recommendations for Top End Overhauls
A top end overhaul involves the removal, the inspection, and the rework of the cylinder head components. A few additional components are replaced and serviced.Your Cat dealer can provide these services and components. Your Cat dealer can ensure that the components are operating within the appropriate specifications.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 Cat 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 Cat 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 is 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 for a credit on replacement parts. Consult your Cat dealer about repair options for your engine.If you elect to perform an overhaul without the services of a Cat dealer, be aware of the recommendations in Table 2.
Table 2
Recommendations for Top End Overhauls (1)
Service Top End Overhaul
Inspect
Rebuild
Replace Cylinder head assemblies
Valves
Inspect
Replace Rocker arms
Valve bridges
Fuel Injectors
(1) For instructions on removal and installation of components, see the Service Manual, "Disassembly and Assembly" module.