C280-16 Marine Engines Overhaul (Top End) Caterpillar


Overhaul (Top End)
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1.1. Fuel Consumption Before A Top End Overhaul
2.1. Remanufacturing or Rebuilding of Components
3.1. Inspection and/or Replacement of Components
4.1. Replacement of Components
5.1. Cleaning and Inspection of Components
6.2. Oil Cooler Core
7.2. Oil Suction Screen

A top end overhaul involves the removal, the inspection, and the rework of the cylinder head components. Some 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.

Note: The driven equipment may also require service when the engine is overhauled. Refer to the literature that is provided by the OEM of the driven equipment.

If you elect to perform an overhaul without the services of a Cat dealer, be aware of the following recommendations.

Fuel Consumption Before A Top End Overhaul

The overhaul interval that is listed in this Operation and Maintenance Manual, "Maintenance Interval Schedule" is expressed in service hours. A more accurate figure to use is fuel consumption. Fuel consumption corresponds more accurately to the engine load. Table 1 lists an average range of fuel consumption for a reasonable load factor before a top end overhaul.

Table 1
Approximate Fuel Consumption Before A Top End Overhaul 
Engine Model  Fuel Consumption  
C280-16  15160000 L (4005272 US gal) 

Remanufacturing or Rebuilding of Components

Rework the following components:

  • Air shutoff valve

  • Cylinder heads

  • Cylinder dowels

  • Exhaust valves

  • Exhaust valve seat inserts

  • Inlet valves

  • Inlet valve seat inserts

  • Inner valve springs

  • Outer valve springs

  • Unit injectors

  • Valve spring guides

  • Valve spring locks

  • Valve rotators

Note: The angles of the valves and seats are different.

If the valves and seats are not replaced, lap the valves and seats. The valve and the outer diameter of the seat must have 360 degrees of contact. If the valves and the seats require regrinding, see the Service Manual, "Specifications" module for the angles.

Inspection and/or Replacement of Components

Inspect the following components according to the instructions that are in AVSpare reusability publications. Refer to Guidelines for Reusable Parts and Salvage Operations, SEBF8029, "Index of Publications on Reusability or Salvage of Used Parts". Replace the components, if necessary.

  • Cylinder sleeves

  • Exhaust shields

  • Starting motor

  • Thermocouples

Replacement of Components

Replace the following components.

  • Connecting rod bearings

  • Cylinder head gaskets and seals

  • Exhaust manifold gaskets

  • Fuel transfer pump seals

  • Inlet air line seals

  • Oil cooler seals

  • Oil pump bearings and seals

  • Oil temperature regulators and seals

  • Turbocharger bearings, bushings, and seals

  • Valve lubricator pump (if equipped)

  • Water pump bearings and seals

  • Water temperature regulators and seals

Cleaning and Inspection of Components

Clean the following components. Inspect the components for good condition. Replace the components, if necessary.

  • Oil cooler core

  • Oil suction screen

Oil Cooler Core

For cleaning the oil cooler core, see this Operation and Maintenance Manual, "Aftercooler Core - Clean/Test" procedure. The procedure may be used for cleaning both the aftercooler core and the oil cooler core.

Oil Suction Screen

For cleaning the oil suction screen, see this Operation and Maintenance Manual, "Engine Oil - Change" procedure.