O-Ring Seal Not Needed On Turbochargers{1052}
Usage:
651E, 657E Tractors;
785 Trucks;
3512 Vehicular ( 51Y ),
Marine ( 50Y ),
Industrial ( 49Y ),
Generator Set ( 49Z ) Engines;
3516 Industrial ( 71Z ),
Marine ( 72Z ) Engines
The above models use an Airesearch Turbocharger containing a 4W4960 Cartridge Group. Model TL9203 is on the cartridge. Some of these turbochargers have an O-ring seal around the backplate as shown. This seal is not needed and should not be used when the unit is reassembled. The seal is not shown in the Parts Book.
A seal in this location is not needed.
Caterpillar Information System:
1985/10/07 Dust Can Cause Generator Set Vibration{4450}
1985/10/07 Two, New Top Dead Center Magnetic Transducers Available{0651,0653,1214,1250}
1985/10/07 New Water Cooled Exhaust Manifolds Available; Existing Water Cooled Exhaust Manifolds Can Be Strengthened Or Salvaged{1059}
1985/09/30 Conversion Group Available For Increased Power{0600}
1985/09/30 Torque Increase For Cylinder Head Bolts{1101}
1985/09/30 Restarting Engines Without A Fuel Priming Pump{1250,1258}
1985/09/30 Maximum Wear Limits Established For Camshaft Roller Followers{1209}
1985/09/23 List Of Mechanical Service Meters For Earlier 3500 Series Engines Using Mechanical Service Meters{1286}
1985/09/23 New Bleed Screw Used In Fuel Injection Nozzle{1254}
1985/09/23 New Keystone Ring Groove Gauge Available{0763}
1985/09/23 Procedure For Turning Pins And Bushings On Sealed And Lubricated Track{4175}
1985/09/16 New Air-To-Air Aftercooler Arrangement Used On Truck Engines {1063}
1985/10/07 Check Height Of Locating Dowels Before Installing Cylinder Head{1201}
1985/10/07 Digital Electric Tachometer Group Available{7462}
1985/10/07 Stronger Air Cleaner Support Assembly{1050,1051}
1985/10/14 Fuel Transfer Pump Improved{1256}
1985/10/14 New Fuel Pressure Switch Available{7490,7332,1419}
1985/10/14 "Routine" Mid-Life Roll-Ins Of Main And Connecting Rod Bearings No Longer Recommended{1230,1203,1219}
1985/10/14 Recommendations For Cooling Systems And Cold Weather Operation{1350}
1985/10/21 Use Glycerine On Most O-Ring Seals {7555,1216,1050}
1985/10/21 Cylinder Head And Valve Rocker Arm Brackets Have Oil Supply Passages In A Different Location To Prevent Possible Oil Leakage Into Cooling System {1100,1102,1350}
1985/10/21 Engine Shuts Down Immediately After Start-Up {7400}
1985/10/28 What ROPS/FOPS Certification Means{7323,7325,7264,7266}
1985/10/28 Comparison Of Fuel Timing Tolerances For Field Settings{1250,1251,1281}