1997/08/01 Caterpillar


New Specification For Clearance Between Turbocharger Turbine Wheel Blades And Turbine Wheel Cover Ring {1052}

Usage:


3600 Family Of Engines

There are new specifications for clearance between the turbocharger turbine wheel blades and the turbine wheel cover ring. These specifications are used to determine the reusability of the turbine wheel cover ring. The turbine wheel cover ring can become worn during normal operation and during turbine water washing. If the clearance is more than the maximum limits, the turbocharger efficiency will decrease. This can result in decreased inlet manifold pressure and decreased engine performance.

The clearance between the turbocharger turbine wheel blades and the turbine wheel cover ring can be measured with a thickness (feeler) gauge. The clearance must be measured with the turbocharger completely assembled. It is recommended that the clearance be checked prior to disassembly for overhaul or nozzle cleaning.

Chart A provides a cross reference between the turbocharger group part number and the turbocharger turbine blade size (WG04, WG06, WG08, and WG10). This blade size is then referenced in Chart B. Chart B provides the maximum recommended clearances between the tip of the turbine blades and the turbine wheel cover ring.


Clearance (R) between the turbine wheel blades (B) and the turbine wheel cover ring (A).


Illustration 2. Locations for maximum clearance specifications. Cover Ring Centerline (C). Turbine Shaft Centerline (D). Turbine Wheel Cover Ring Inside Diameter (E). Turbine Wheel Blade Outside Diameter (F).

Caterpillar Information System:

1997/08/01 New Turbocharger Wash Water Lines Groups Used {1052}
1997/08/01 Revised Systems Operation, Testing And Adjusting Manual For 3612 And 3616 Diesel Engines Is Available {1000}
1997/08/01 New Electronic Control Group Available For Gas Engine Ignition Groups {1550,1559}
1997/08/01 Reliability And Fatigue Strength Improved In Connecting Rod {1218,1219}
1997/08/01 Improved Clamps For Turbocharger Exhaust Couplings Reduce Exhaust Leaks {1052}
1997/08/01 Troubleshooting Data Sheet For Diesel Engines {1000}
1997/08/01 New Software Available For Improvements To Marine Engines {1920}
1997/08/01 Pipe Plug Used On Electronic Control Group (MAPS Sensor) {1917}
1997/08/01 Correct Procedure For Installing Hydraulically Actuated Electronic Unit Injectors (HEUI) {1290}
1997/08/01 Tube Is Available To Raise The Rain Cap In Order To Avoid Interference With The Inlet Manifold {1051}
1997/07/01 New Fuel Injector Group Eliminates Corrosion Between Fuel Injector And Cylinder Head{1290}
1997/07/01 Updated Connecting Rod Bolt Tightening Procedure{1218}
1997/08/01 Air Quality Requirements For Turbocharger Air Impingement System {1052}
1997/08/01 Changes To Cylinder Head Salvage Procedure {1100}
1997/08/01 Installation Procedure For Cylinder Head Studs {1100}
1997/08/01 New Manual Valve Group [Measure Cylinder Pressure (Kiene® Valve)] Used; Kiene Valve Installation Procedure {1100,1118}
1997/08/01 Revised Starting Procedure For Engines Using Kiene Valves {1100}
1997/08/01 New Torque Specification For Some Bolts In Valve Mechanism Group {1102,1123}
1997/08/01 Crankshaft Oil Passage Plugs {1202}
1997/08/01 Connecting Rod Bearing Part Numbers {1203,1219,1230}
1997/08/01 Procedures For Changing From Running On Heavy Fuel Oil (HFO) To Running On Distillate Fuel {1280}
1997/08/01 New Gear Assemblies With A Stronger Shaft Are Used In Governor Drive Groups {1288}
1997/08/01 New Schedule For Cleaning Unit Injectors In Engines In Heavy Fuel Oil (HFO) Applications {1290}
1997/08/01 Fuel Injector Trim Set Screw {1290}
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