Replacing The Shutoff Assembly In Engines With Older Governors{1264,1289}
Usage:
3114, 3116, 3126 Industrial, Marine And Generator Set Engines
Engines with older governors can sometimes experience a rhythmic speed hunting problem. This problem can be corrected in some engines by replacing the 7W-9638 Shutoff Shaft Assembly with the 4P-9490 Shutoff Shaft Assembly. The 4P-9490 Shutoff Shaft Assembly acts as a damper in the governor.
NOTE: The governor should be inspected for worn and damaged parts prior to changing the assembly. The governor will also need to be reset on a 1U-7326 Governor Calibration Bench as part of this procedure.
Caterpillar Information System:
1996/07/22 Governor Shimming Is Determined By The Governor Test Bench Calibration{1264,1289}
1996/07/22 New Service Tool Calibration Pins For Mechanical Goverened Engines{1264,1265}
1996/07/22 New Bench Checking And Setting Procedure For Fuel Ratio Control (FRC) Mechanical Goverened Engines{1264,1265}
1996/06/12 New Oil Pump Used As Service Replacement{3310}
1996/06/12 Field Installation Procedure For Stator Thermocouples and RTDs{7498,4453}
1996/06/12 Preventive Measure For Protection Of Air Prelube Pumps{1319}
1996/06/12 New Hose Assembly And Clip Replaces Former Tube Assembly{1318}
1996/06/12 New Components In Accessory Drive Group And Alternator Drive Group Provide Improved Serviceability And Help Prevent Oil Leaks{1207,1425}
1996/06/12 Improvements To Check Valve Within Prechamber Group Reduce Maintenance Schedule{1106}
1996/06/12 Turbocharger Nozzle Cleaning{1052}
1996/06/12 Start-Up Procedure After Rebuild{1000}
1996/06/12 New Part Kits Available For SR4B Generators{4469}
1996/07/22 Servo Assembly Parts Have Been Changed To Make Some Parts Common Between Mechanical Governed (Type I-VI) Engines{1264,1289}
1996/07/22 New Electroless Nickel-Plated Oil Pan Provides Corrosion Protection{1302}
1996/07/22 New Strap Used In Alternator Mounting Group{1357}
1996/07/22 Procedure To Clean Area Around Injector Case And Sleeve Bore During Unit Injector Replacement{1713}
1996/07/22 New Electron Beam (EB) Welded Pistons Have Been Introduced For G3500 Engines Operating At Or Above 1500 rpm{1213,1214,1225,1226,1227}
1996/07/22 New Oil Jet Tube Assemblies Replace Oil Cooling Jet Assemblies{1331}
1996/07/22 New Water Lines Group Will Help Prevent Exhaust Manifold Cracks{1380}
1996/07/22 New Variable Timing Control Box Assemblies Are Used In Detonation Sensitive Timing Ignition Groups To Provide Improved Detonation Protection{1559,1560}
1996/07/22 New Stainless Steel Air Pressure Sensor And Gas Pressure Sensor Tube Assemblies In Engine Wiring Groups Provide Increased Strength And Corrosion Resistance{1058,1285,1904}
1996/07/22 New Bellows Assembly Made With Inconel® To Withstand Frequent Exhaust Temperature Cycles{1059}
1996/07/22 New Bellows Assembly Made With Inconel® To Withstand Frequent Exhaust Temperature Cycles{1059}
1996/07/22 New Technique To Remove Cylinder Head From Cylinder Block{1101,1201}