Single Coil Shut-Off Solenoid Used In Place Of Dual (Two) Coil Shut-Off Solenoid
Usage:
3406 Truck Engines
Description of Change: Electric shut-off solenoids with a single coil design are now used on the above models. The former solenoids were dual (two) coil design with contacts to disconnect the pull-in coil when the solenoid plunger energized (activated). Corrosion on these contacts can cause the pull-in coil to be activated at all times. The result was possible overheating of the pull-in coil and failure of the solenoid. Electric shut-off solenoids with a single coil design do not have contacts and are not sensitive (changed by differences) to adjustments made to the plunger.
Adaptable To: The new shut-off solenoids are a direct replacement for the former shut-off solenoids when all of the parts shown in the chart for a specific model are used together.
Caterpillar Information System:
1978/12/13 New Piston Groups Use Keystone-Type Piston Rings And Have Improved Design Of Valve Pockets
1978/12/13 New Exhaust Valve Has Improved Three-Piece Construction
1978/12/13 A Washer With Closer Tolerances Is Now Used In The Governor And Fuel Pump Drive Group
1978/12/13 New Hose Has More Resistance To Heat
1978/11/15 5P8690 Fixture Group And 5P8691 Socket Are Available For Easier Reconditioning Of 5M4169 Cam Followers
1978/11/15 New Fuel Injection Nozzles Are Used In 3208 Truck Engines When Equipped With EGR
1978/11/15 Tips For Service Information Retrieval System (SIRS) Users
1978/11/15 Improvement Made To Solenoid In Electric Shut-Off Group
1978/11/15 New Transmission Mounting Group Has Improved Design For Longer Service Life
1978/11/15 New Control Cover Gives Better Control Of Exhaust Gas Recirculation System
1978/10/18 Salvage Of Turbocharger Compressor Housing During Reconditioning
1978/10/18 A New 5P9698 Frequency Calibrator Is Available For The Calibration Of Caterpillar Diagnostic Tools
1978/12/13 Sender Unit For Engine Oil Pressure Gauge Moved To New Location On Truck Cab
1978/12/13 New Coolant Temperature Regulator Has Flat Washer-Type By-Pass Valve
1978/12/13 List Of Service Publications
1978/12/13 New Design Brace Used In 4N2905 Air Cleaner Group
1978/12/13 90° Elbow Added To Air Cleaner Group To Prevent Damage To The Air Filter Service Indicator
1978/12/13 New Electric Service Meter Used
REWORK HMSO (HYDRAMECHANICAL SHUTOFF) ON D379B D398B D399 IN ALL APPLICATIONS IF SO EQUIPPED PI7004 WORLDWIDE REWORK HMSO (HYDRAMECHANICAL SHUTOFF) ON D379B D398B D399 IN ALL APPLICATIONS IF SO EQUIPPED PI7004 WORLDWIDE
PSP FOR INSTALLING NEW FUEL RATIO CONTROL ON 3306 DI-TA TRUCK ENGINES PS0160 WORLDWIDE EXCEPT BRAZIL COSA SENT TO TRUCK TEPS PSP FOR INSTALLING NEW FUEL RATIO CONTROL ON 3306 DI-TA TRUCK ENGINES PS0160 WORLDWIDE EXCEPT BRAZIL COSA SENT TO TRUCK TEPS
PRIORITY:INSTALLING GEAR-TYPE OIL PUMP; INSPECT OUTPUT SPLINES AND CONTROL VALVE PIP965 US AND ALL AMERICAS PRIORITY:INSTALLING GEAR-TYPE OIL PUMP; INSPECT OUTPUT SPLINES AND CONTROL VALVE PIP965 US AND ALL AMERICAS
PRIORITY:RETIGHTEN CRANKSHAFT COUNTERWEIGHT BOLTS; REPLACE BOLTS IF NECESSARY 3508, 3512 ENGINES - PI3005 - MAILED US AND CAN ADA, CACO, COFA, CFEL, BRAZIL, COSA PRIORITY:RETIGHTEN CRANKSHAFT COUNTERWEIGHT BOLTS; REPLACE BOLTS IF NECESSARY 3508, 3512 ENGINES - PI3005 - MAILED US AND CAN ADA, CACO, COFA, CFEL, BRAZIL, COSA
PARTIAL CREDIT AVAILABLE FOR SALES OF VALVE SPRING PRODUCT UPDATES FOR CERTAIN 3208 N/A ENGINES PI7007 WORLDWIDE (IN CLUDING ALL TEPS) EXCEPT COSA, BRAZIL SEE JUNE 27,1983 SERVICE LETTER PARTIAL CREDIT AVAILABLE FOR SALES OF VALVE SPRING PRODUCT UPDATES FOR CERTAIN 3208 N/A ENGINES PI7007 WORLDWIDE (IN CLUDING ALL TEPS) EXCEPT COSA, BRAZIL SEE JUNE 27,1983 SERVICE LETTER
VERIFICATION AND HANDLING OF MAIN BEARING FAILURES CAUSED BY ELECTRICAL DISCHARGE PITTING - SENT TO TEPS TRUCK DEALERS - NOT SENT TO COSA VERIFICATION AND HANDLING OF MAIN BEARING FAILURES CAUSED BY ELECTRICAL DISCHARGE PITTING - SENT TO TEPS TRUCK DEALERS - NOT SENT TO COSA