1978/02/13 Caterpillar

Replacement Seal Group For Water Pump Impeller Now Has All The Seal Parts Plus An Installation Tool{1361,0622}

Usage:

3300 and 3400 Series Engines;
D379, D398, D399 Engines

Description of Change: The seal groups, used for parts replacement of the water pump impeller seal on the above models, now have all of the parts that are needed for seal replacement. Formerly, it was necessary to order the seal assembly, ring and seal separately. Also, installation tools have been added to the seal groups. The purpose of the installation tools is to put the seal parts in the correct position during assembly. Seals that are assembled with seal parts in the wrong position can have early failures. Also, the installation tools make installation of the seals easier and faster. The installation tools can not be ordered separately.

Adaptable As: Direct replacement.

Illustration 1. Water pump impeller seal.

Illustration 2. Installation of seal and ring.

Illustration 3. Installation of seal assembly.

INSTALLATION:

NOTE: Use clean water only as a lubricant to make the installation of the seal easier.

1. Install the shaft, bearings and the oil seal. See the Service Manual.

2. Use the installation tool to install the seal and ring. Use hand pressure only. See Illustration 2.

3. Remove the spring from the seal assembly. Install the seal assembly with the installation tool until the seal assembly makes light contact with the ring. Use hand pressure only. See Illustration 3.

4. Install the spring and impeller. See the Service Manual.

Caterpillar Information System:

1978/02/06 Probable Causes Of Low Fuel Delivery During Testing On Fuel Injection Test Benches{0650,1250}

1978/02/06 New Water Temperature Regulator Opens At 180°F (82°C){1350,1355,7304}

1978/02/06 Successful Engine Service-3208 Engine Booklet Is Available{1000}

1978/02/06 Stronger Clutch Housing Used In Variable Capacity Torque Converter{3102}

1978/02/06 Add New Measurement And Identification To FT904 Backlash Indicator{0653,3258}

1978/02/06 Adjustment Of Track Tension On Machines With One Carrier Roller Per Side{4150}

1978/02/06 Silicone Sealant Is Now Used To Keep Water Out Of The Steering Clutch Case{4059,4100,4106,4115}

1978/01/30 Air Line For Air Compressor Governor Now Connected To Outlet For Wet Air Tank{4272,1065,4278}

1978/01/30 Retaining Ring Of A New Design Now Used In Torque Converter Group{3100}

1978/01/30 Do Not Change Factory Fuel Or Speed Settings On Truck Engines Unless New Settings Are Certified Under Applicable EPA Regulations{0336,0337,1257}

1978/01/30 Breather For Transmission Case Now Made Of Metal{3150}

1978/01/30 New Water Pump Cover Has A Baffle And Wall To Send Coolant Flow From Bypass Line Directly Into Water Pump{1361}

1978/02/13 Complete Set Of Contact Points For Dial Indicators Is Now Available In One Group{0653}

1978/02/13 Several Improvements Made To Lines Group In Area Of The Hitch{5057,5077}

1978/02/13 Improvements Made To Push Frame; Instructions To Make Reinforcements On Earlier Push Frames Available{6225}

1978/02/13 Strip Added Under The Hinge For The Front Windshield On ROPS Cabs{7325}

1978/02/13 Check Degree Number On Timing Fixture Plate Assemblies{0650}

1978/02/20 New Transmission Valve Groups Increase Winch Line Pull When Transmission Is In Neutral{3150,3152,3157,3167,3100}

1978/02/20 Separate Parts Of Tire Valve Group Now Available For Parts Service{4202}

1978/02/20 Reinforcements For Front Frame{7051}

1978/02/20 Improved Lift Arm And Service Brace Now Used{0643,5102,6119}

1978/02/20 Muffler Mounting Group Now Used To Give More Support To Muffler{1062}

1978/02/27 Use New Thickness Gauge To Check For Reusability Of Transmission Disc Assemblies Made From F37 Clutch Friction Material{0653,3155}

1978/02/27 New Hose Assembly Used In Oil Lines Group For Brake Cooling{3154,4100}