1990/03/26 Caterpillar

New Oil Control Piston Ring Used In 3300 Family Of Engines {1213,1214,1215}

Usage:

Description of Change: A new oil control piston ring is used in the 3300 Family of Engines. The new ring has narrower rails and increased unit pressure. This allows for better conformability to the cylinder liner walls and inhibits excess oil from reaching the crown of the piston and igniting. The former piston ring had less unit pressure which allowed more oil to bypass and burn, increasing oil consumption and reducing overall efficiency.

Adaptable To: The new 7E6047 Piston Ring is a direct replacement for the former 9L6934 Piston Ring which has not been canceled. The new piston ring can be used in both keystone and rectangular ring pistons. No modifications need to be made to the piston groove to use the new rings. This change is effective with 3304 (07Z25068, 12Z35965), and 3306 (08Z54776, 10Z18207, 13Z20739) Vehicular Engines, and 3306B (63Z17804) Truck Engine.

Caterpillar Information System:

1990/03/19 Possible Overvoltage Conditions From Output Of VR3 Voltage Regulator {4467,4474}

1990/03/19 New Air Conditioner Thermostatic Switches Used {7337}

1990/03/12 9W2126 Module (Relay Module){7490}

1990/03/12 Idle Shutdown Timer Used In Auxiliary Power Applications{1705,1706,4267}

1990/03/12 Shorter Bolt Used To Hold Oil Pan Drain Cover{1302}

1990/03/12 New Rear Gear Group Has Spur Gears Instead Of Helical Gears For Longer Service Life{1204,1206,1212}

1990/03/12 New Hand-Held Microfiche Reader Available{0354,0374}

1990/03/12 New Loupe (Magnifier) Available For Inspecting Failed Or Broken Parts{0777}

1990/03/05 New Piston Pin Retainer Used In 3600 Family Of Engines{1214}

1990/03/05 New Basic Turbocharger Groups And Cartridge Groups With Improved Compressor Seals, Thrust Bearings, And Hollow Shaft For Reduced Heat Soak{1053,1077}

1990/03/05 New Plug Used In Front Housing For Fuel Injection Control Group{1151,1298}

1990/03/05 2N4620 Rubber Drive Block Reinstated For Parts Service{3305}

1990/03/26 New Personality Modules Require New Service Program Modules {1902}

1990/03/26 Caterpillar Announces 460 hp 3406B (5YG) Heavy-Duty Diesel Truck Engine {1000}

1990/04/02 Correct Replacement Of Forward Warning Horns{7402}

1990/04/02 New Flywheel Ring Gear Available To Improve Starter Engagement{1158,1454}

1990/04/02 New Valve Lifter Improves Oil Flow To Top Of Engine{1112,1119}

1990/04/02 Correct Torque Required For Bolts In Rear Gear Groups; Specification Omitted From Some Service Manuals{1204,1237,7568}

1990/04/02 Improved Filter Service Film For Duplex Fuel{1261,7557}

1990/04/02 What's Your Answer?{0315,1000,1250,3000}

1990/04/09 New Turbocharger Group For 3512 (24Z) High Speed Generator Set Engines{1052}

1990/04/09 Improvements, Maintenance and Troubleshooting Information For Electric Starting Motors{1453,7521,7524,7526}

1990/04/09 What's Your Answer?{0315,0114,0785,1400}

1990/04/23 Part Numbers For Polyvee Belts From Original Equipment Manufacturers (OEM's){1357}