SEAL-O-RING 5217420 - Caterpillar

This maintenance interval is labeled TOP END, because it involves removal, inspection and rework of the cylinder head components. This maintenance interval is dependent on load-sensitive items.A top end overhaul is generally indicated by increased fuel consumption and reduced power. This option consists of completely reconditioning your cylinder heads. The cylinder components are usually not worn enough to need repair.Refer to the "Index of Publications On Reusability Or Salvage of Used Parts" section of the "Guideline For Reusable Parts and Salvage Operations," SEBF8029 to determine the reusability publications needed for inspecting your parts.The "Guideline For Reusable Parts and Salvage Operations," is part of an established Caterpillar parts reusability program. These guidelines were developed to assist Caterpillar dealers and customers reduce costs by avoiding unnecessary expenditures for new parts when existing parts can be used as is, repaired or salvaged.If your parts comply with the established visual, dimensional, etc., inspection specifications expressed in the reusable parts guideline, then they should be reused. Parts complying within the specifications outlined in the reusable part guideline will give an additional service life.If your parts are not within specification, then they should be salvaged, repaired or replaced. Failure to salvage, repair or replace out-of-spec parts will result in unscheduled downtime and could result in costly repairs caused by potential damage to other engine parts.Out-of-spec parts can also contribute to increased fuel consumption and reduction of engine efficiency. Follow the maintenance requirements for this maintenance interval, using the "Guideline for Reusable Parts and Salvage Operations" as a guideline for parts reusability.Refer to the Service Manual for disassembly and assembly procedures to perform the required maintenance as outlined in this section or contact your Caterpillar dealer for assistance.Your Caterpillar dealer can provide you with the necessary parts to rebuild your engine at the least possible cost. There may be options available such as the Remanufactured Core Program as well as individual parts for Top End parts replacement.Rebuild or Exchange
Cylinder HeadsTurbochargerFuel Transfer PumpReplace
Cylinder Head GasketsCylinder Head SealsCylinder Head O-ring SealsCylinder Head PlugsOil Pump Bushings and SealsWater Temperature Regulators (Thermostats) and SealsOil Cooler SealsExhaust Manifold Bellows, Gaskets and SealsThermocouples (If Equipped)Water Pump Bearings and SealsIntake Air Lines SealsExhaust Shields (if equipped)Electronic Rack Sensor ProbeElectronic Temperature Derate Probe (If Equipped)Temperature Sensor & InputsClean
Oil Cooler CoreAftercooler CoreLube Oil Suction ScreenInspect/Replace if necessary
Unit InjectorsCylinder Head Intake InsertsCylinder Head Exhaust InsertsCylinder Head Outer Valve SpringsCylinder Head Inner Valve SpringsCylinder Head Valve Spring GuidesCylinder Head Valve LocksCylinder Head Valve RotocoilsCylinder Head Intake Valves (Grind If Not Replaced)Cylinder Head Exhaust Valves (Grind If Not Replaced)Cylinder Head Valve Seats (Grind If Not Replaced)Cylinder Head DowelsThrust Bearings (except crankshaft)Electric Starter BrushesGenerator Drive PlateObtain
Coolant Analysis