1978/03/01 Caterpillar

Replacement Seals And Wear Sleeves Now Available As A Crankshaft Seal Kit

Usage:

3406 and 3408 Industrial, Marine and Truck Engines;
3412 Industrial and Marine Engines

Description of Change: The crankshaft seals and wear sleeves used in the crankshaft groups and rear gear groups for the above models are available as a kit. Formerly, the seal and wear sleeve were sent separately. Now, these parts are assembled before shipment. This prevents damage to the sealing surfaces during shipment, storage and installation. Also, the seal kit has all of the necessary lubrication needed for installation.

Adaptable To: The 7N1999 Crankshaft Seal Kit can be installed on all earlier models shown.

INSTALLATION: Use the tools and procedures shown in Special Instruction Form SMHS7100. It will not be necessary to assemble the seal and wear sleeve or put lubricant on the seal lip.

Caterpillar Information System:

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}

1978/02/08 Complete Set Of Contact Points For Dial Indicators Is Now Available In One Group

1978/02/08 Attachment Groups Put Corrosion Inhibitor Directly Into Cooling System

1978/02/08 Do Not Change Factory Fuel Or Speed Settings On Truck Engines Unless New Settings Are Certified Under Applicable EPA Regulations

1978/02/08 Change In Design Of Engine Governor, Fuel Injection And Transfer Pump Groups, And Fuel Ratio Control Groups

1978/03/01 Modification Of Oil Pan For Installation Of Oil Sump Heater

1978/03/01 Stronger Exhaust Manifold Gasket Now Used

1978/03/01 Use Again Specifications For Valve Springs Are Changed

1978/03/01 New Tachometer Drive Adapter Assembly Prevents Failure Of The Seals For The Tachometer Drive Group And Transfer Pump

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)