GEAR AS-IDLER 1448263 - Caterpillar

Introduction
"Overspeed" is a condition where the engine speed reaches an RPM higher than the intended operating range.Although systems are in place to prevent "Overspeed" events, in some scenarios "Overspeed" events can occur and can have detrimental impact on engine life, depending on frequency and severity.The engine-specific charts suggest the actions to take for your product. Refer to engine-specific publications for details on each inspection.This publication serves only as a general guide. Technicians should use their best judgment to evaluate each scenario.3500 Overspeed Chart
Table 1
RPM Range    2200 to 2399    2400 to 2599    2600 to 2799    2800 to 2999    3000 or More    
Event Count    255 or More    1 to 24    25 or More    1 or More    1 or More    1 or More    
Cams
and
Lifters     Investigate cause and change operations     Investigate cause and change operations     Inspect     Inspect all components or remove engine
If removing engine, notify dealer CRC of the "Overspeed" event to prompt additional component inspection    
Valves
and
Pistons     Investigate cause and change operations Inspect    
Rod Eye Bushings     Investigate cause and change operations
Rod Bearings     Inspect rod bearings C175 Overspeed Chart
Table 2
RPM Range    2200 to 2399    2400 to 2599    2600 to 2699    2700 or More    
Event Count    1 or More    1 to 25    25 or More    1 or More    1 or More    
Cams
and
Lifters     Investigate cause and change operations     Investigate cause and change operations     Inspect     Inspect all components or remove engine
If removing engine, notify dealer CRC of the "Overspeed" event to prompt additional component inspection     Remove and replace engine
Notify dealer CRC of the "Overspeed" event to prompt additional component inspection    
Valves
and
Pistons    
Rod Eye Bushings    
Rod Bearings    3500 Engine Reference Publications
Reuse And Salvage Guidelines, SEBF8002, "Visual Inspection of Valves, Valve Springs, and Valve Bridges"
Reuse And Salvage Guidelines, SEBF8009, "Visual Inspection of Main Bearings and Connecting Rod Bearings"
Reuse And Salvage Guidelines, SEBF8049, "Visual Inspection of the Piston"
Reuse And Salvage Guidelines, SEBF8063, "Visual Inspection of Connecting Rods"
Reuse And Salvage Guidelines, SEBF8067, "Inspection of Slipper Followers and Roller Lifters"
Reuse And Salvage Guidelines, SEBF8146, "Visual Inspection of Camshafts" C175 Engine Reference Publications
Reuse And Salvage Guidelines, SEBF8009, "Visual Inspection of Main Bearings and Connecting Rod Bearings"
Reuse And Salvage Guidelines, SEBF8049, "Visual Inspection of the Piston"
Reuse And Salvage Guidelines, SEBF8063, "Visual Inspection of Connecting Rods"
Reuse And Salvage Guidelines, SEBF8146, "Visual Inspection of Camshafts"
Reuse And Salvage Guidelines, SEBF9186, "Specifications and Visual Inspection of Rocker Arms, Rocker Arm Shafts, Bridge Assemblies, and Lifters for C175 Engines"