SWITCH ASSEM. 6N8901 - Caterpillar

Overhaul Considerations
The need for a major overhaul is determined by several factors.
An increase of oil consumption
An increase of crankcase blowby
The total amount of fuel consumption
The service hours of the engine
The wear metal analysis of the lube oil
An increase in the levels of noise and vibrationAn increase of wear metals in the lube oil indicates that service may be necessary for the bearings and the surfaces that wear. An increase in the levels of noise and vibration indicates that rotating parts require service.Note: The oil analysis may indicate a decrease of wear metals in the lube oil. The cylinder liners may be worn so that polishing of the bore occurs. Also, the increased use of lube oil will dilute the wear metals.Monitor the engine as the engine accumulates service hours. Consult your Cat dealer about scheduling a major overhaul.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.For the major overhaul, all the bearings, seals, gaskets, and components that wear are disassembled. The parts are cleaned and inspected. If necessary, the parts are replaced. The crankshaft is measured for wear. The crankshaft may require regrinding. Alternatively, the crankshaft may be replaced with a Cat replacement part.Your Cat dealer can provide these services and components. Your Cat dealer can ensure that the components are operating within the appropriate specifications.Replacement of Components
Replace the following components during the major overhaul:
Camshaft bearings
Connecting rod bearings
Crankshaft seals
Crankshaft thrust washers
Electronic unit injectors
Gear train bushings
Gear train bearings
Main bearings
Piston rings
Aftercooler coreInternational Convention for Safety of Life at Sea (SOLAS)
Caterpillar recommends replacing the following:
All shields that have been installed to cover up fuel and oil line connections per (SOLAS) regulations
All marine certification society approved tapes are installed to cover up fuel line connections and oil line connections according to the SOLAS regulations.Inspection, Reconditioning, or Exchanging of Components
Inspect the following 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".Recondition the worn components or exchange the components, if necessary. Your Cat dealer can provide these services and components.
Camshaft followers
Camshaft thrust washers
Connecting rods
Crankshaft vibration damper
Cylinder head assembly
Cylinder liners
Engine mounts
Scavenge oil pump
Engine wiring harness
Exhaust manifold seals and gaskets
Exhaust manifold bellows
Fuel pressure regulating valve
Fuel priming pump
Fuel transfer pump
Inlet manifold gaskets
Inlet manifold seals
Oil cooler core
Oil pump
Pistons
Piston pins
Prelube pump
Pushrods
Rocker arms
Spacer plate
Software update
TurbochargerInspection of Components
Inspect the following 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".
Camshaft
Crankshaft
Drilled oil passages
Driven equipment (alignment)
Engine cylinder block
Engine control module
Flywheel
Front gear train (gears)
Oil suction screen
Rear gear trainInspect the camshaft for damage to the journals and the lobes.Inspect the crankshaft for any of the following conditions:
Deflection
Damage to the journals
Bearing material that has seized to the journalsCheck the journal taper and the profile of the crankshaft journals. Check these components by interpreting the wear