1983/10/17 Caterpillar

Changes Made To Air Intake Shut-offs And Contactor Groups{1078}

Usage:

All 3500 Series Engines

Description of Change: Several new parts are now used in the air intake shut-off group on 3500 Series Engines. Also, new solenoids are used in the contactor and contactor mounting groups. In the air intake shut-off groups the new arm, latch, pin and carrier are made from a harder material to decrease wear on these parts. Also, in this group a new spring, with larger diameter wire is used with a wave washer to decrease vibration of the shaft and valve assembly. A new valve assembly with a seal made of viton material is used to permit a longer service life.

In the contactor group, a new solenoid with a hardened pin is used to decrease wear between it and the arm in the shut-off group.

In the contactor mounting group a change was made to the solenoid assembly. The solenoid assembly now has a new solenoid with the harder pin and a diode.

Adaptable To: The new and former parts are shown in the charts. To use the new spring on earlier engines it will be necessary to drill a larger hole in the housing assembly. See the illustration.

New dimension for the locator hole in the housing assembly.

Caterpillar Information System:

1983/10/17 Broken Edge Filter Or Plugged Cylinder Head Adapter Can Cause Rough Engine Operation Or Low Power{1252}

1983/10/10 New Water Pump Oil Seal Prevents Leaks{1361}

1983/10/10 New Service Centers For 6V3100 Engine Timing Indicator Group{0651}

1983/10/10 Changes Made To Identification Marks On Connecting Rod Assemblies{1218}

1983/10/10 New Connecting Rod And Main Bearings Used{1203,1219,1226,1227,1230}

1983/10/10 S.O.S Program Synopsis{1318,5068,3179,0652}

1983/10/03 New Oil Pump Has Bypass Valve And Oil Return Passage Inside The Pump{1304}

1983/10/03 Use 6V6070 Tool Group And New Adjustment Procedure For New Scroll Fuel System{0654,1264,1278}

1983/09/26 Product Identification Number To Replace Serial Number On Earthmoving Equipment{7557}

1983/09/26 New Bearing Used On Main Shaft{3303}

1983/09/26 Service Information For Woodward Governors{0374,1264}

1983/09/26 Oil Shield And Rotocoil Must Be Installed Together For Acceptable Oil Control{1109}

1983/10/17 New Air Starting Motor Has A Slip-Clutch Type Drive Gear{1451}

1983/10/17 Improved Lower Shaft Bearing Now Used{3307}

1983/10/17 Maintenance Free Battery Available For Use In On-Highway Trucks And Buses{1401}

1983/10/17 Modification Of Control Panel Gives Different Power Source For Overcrank Timer To Prevent Starter Motor Failures{7450}

1983/10/17 Remanufactured Fuel Pump And Governor Groups{1251,1264}

1983/10/17 Valve Damage Can Be Caused By Short Intervals Of Engine Operation In Very Cold Temperatures{1105,1208}

1983/10/24 FT1782 Turbocharger Test Stand Available{0651,1052}

1983/10/24 New Seal And Washer Will Prevent The Flow Of Dirty Fuel Past The Filter{1261}

1983/10/24 New Exciter Stator Field Core Assembly And Bracket{4450,4470}

1983/10/31 Clean and Protect Split Master Links During Track Reconditioning{4176}

1983/10/31 Additional Remanufactured Water Pumps Available{1361}

1983/10/31 New Control Valve Group Corrects Pressure Pulsations{3313,3300}