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 Attachment Groups Put Corrosion Inhibitor Directly Into Cooling System{1350}

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

1978/02/06 Smaller Quantity Of Oil Now Used In Engine Oil Pan; Prevents Contact Between Crankshaft And Oil{1318}

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 Stronger Front Support Assembly{1153}

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

1978/01/30 Oil Strainer (Screen) Added To Turbocharger Thrust Bearing{1052,1053}

1978/01/30 Valve Damage Can Be Caused By Short Intervals Of Engine Operation In Very Cold Temperatures{1105,1208}

1978/01/23 Change In Design Of Engine Governor, Fuel Injection And Transfer Pump Groups, And Fuel Ratio Control Groups{1264,1278,1286}

1978/01/23 Design Of Governor Control Linkage Changed; Less Force Is Needed To Move The Accelerator Pedal{1265,1269}

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

1978/02/27 New Seal Assembly With Longer Ferrule Prevents Damage To Ferrule During Cylinder Head Installation{1100,1101,1300}

1978/02/27 Fabricated Adapters Permit Horizontal Mounting Of Transmissions On 1P2420 Transmission Repair Stand{0640}

1978/02/27 Replacement Seals And Wear Sleeves Now Available As A Crankshaft Seal Kit{1202,1160,1161}

1978/02/27 Stronger Exhaust Manifold Gasket Now Used{1059}

1978/02/27 Improved Fuel Priming Pump Assembly Has Better Sealing Characteristics; Repair Kit Available For Knob{1258}

1978/02/27 Modification Of Oil Pan For Installation Of Oil Sump Heater{1302}

1978/02/27 New Tachometer Drive Adapter Assembly Prevents Failure Of The Seals For the Tachometer Drive Group And Transfer Pump{7462,1256}

1978/03/06 Stronger Piston And Connecting Rod Are Tapered In Area Of Piston Pin{1213,1214,1218}

1978/03/06 5P8558 Pressure Gauge Calibrating Group Checks Pressure Gauges{0650}

1978/03/06 Use Again Specifications For Valve Springs Are Changed{1108}

1978/03/06 New Starter Motors Have Solenoid On Top Of Starter{1407,1453}