New Tachometer Drive Adapter Assembly Prevents Failure Of The Seals For The Tachometer Drive Group And Transfer Pump
Usage:
3408 and 3412 Engines In All Applications
Description of Change: The tachometer drive groups for the above models now have a different design adapter assembly. The shaft of the adapter assembly is held in a vertical position by the tachometer drive housing. Formerly, the shaft was supported (held) by the part into which it was assembled. In this position it was possible for the shaft to fall out of position and permit the tachometer drive seal to be damaged. As a result of this, dirt got into the transfer pump and caused the seals to be damaged.
Adaptable As: Direct replacement on all earlier models shown.
Caterpillar Information System:
1978/03/01 Use Again Specifications For Valve Springs Are Changed
1978/03/01 Stronger Exhaust Manifold Gasket Now Used
1978/03/01 Modification Of Oil Pan For Installation Of Oil Sump Heater
1978/03/01 Replacement Seals And Wear Sleeves Now Available As A Crankshaft Seal Kit
1978/02/08 Design Of Governor Control Linkage Changed; Less Force Is Needed To Move The Accelerator Pedal
1978/02/08 Successful Engine Service-3208 Engine Booklet Is Available
1978/02/08 Stronger Front Support Assembly
1978/02/08 Smaller Quantity Of Oil Now Used In Engine Oil Pan; Prevents Contact Between Crankshaft And Oil
1978/02/08 New Water Pump Cover Has A Baffle And Wall To Send Coolant Flow From Bypass Line Directly Into Water Pump
1978/02/08 Oil Strainer (Screen) Added To Turbocharger Thrust Bearing
1978/02/08 Probable Causes Of Low Fuel Delivery During Testing On Fuel Injection Test Benches
1978/02/08 New Water Temperature Regulator Opens At 180 °F (82°C){1350,1355,7304}
1978/03/01 List Of Service Publications
1978/03/01 New Starter Motors Have Solenoid On Top Of Starter
1978/03/01 Replacement Seal Group For Water Pump Impeller Now Has All The Seal Parts Plus An Installation Tool
1978/03/01 Stronger Piston And Connecting Rod Are Tapered In Area Of Piston Pin
1978/03/01 Improved Fuel Priming Pump Assembly Has Better Sealing Characteristics; Repair Kit Available For Knob
1978/04/05 Correct Adjustment Of The Governor Control Linkage In Truck Engines Is Necessary To Prevent Low Power
1978/04/05 A Gasket Group Is Available To Give Improved Sealing For The Oil Supply To The Rocker Arms On Early Engines
1978/04/05 9N3700 Or 9N3299 Nozzle Assemblies Must Be Used On 3208 Engines That Are Equipped With Exhaust Gas Recirculation (EGR)
1978/04/05 5P4149 Conversion Group To Become A Discontinued Item On October 1, 1978
1978/04/05 List Of Service Publications
1978/04/05 How To Find Correct Oil Change Intervals For Truck Engines Operated In Short Distance Applications (Pick Up And Delivery Service)
1978/04/05 Soft Washers And Lockwashers Are Now Used With The Mounting Bolts For Air-Fuel Ratio Control