1978/02/27 Caterpillar

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

Usage:

D8K Tractors;
583K Pipelayers;
and G342C Gas Engines

Description of Change: A seal assembly with a ferrule that is longer on one end is now used in the cylinder head groups for the above models. The longer neck of the ferrule permits more of the ferrule to be installed into the spacer plate. This makes the ferrule more rigid for better alignment with the oil passages in the cylinder head. With the former seal assembly, it was possible for the shorter ferrule to be moved out of alignment and be damaged when the cylinder head was installed. This caused a restriction and less oil flow to the upper part of the engine.

Adaptable As: The new 7N8852 Seal Assembly is a direct replacement for the former 3N9632 Seal Assembly on all earlier models shown that use a spacer plate between the cylinder head and cylinder block of the engine.

NOTE: The 7N8852 Seal Assembly will also be a part of the replacement block groups available for earlier engines without spacer plates.

Caterpillar Information System:

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

1978/02/13 Replacement Seal Group For Water Pump Impeller Now Has All The Seal Parts Plus An Installation Tool{1361,0622}

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}

1978/02/27 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}

1978/03/13 5P8687 Tee Test Tooling Group{0651,5050}

1978/03/13 When A 6N5906 Hour Meter Will Not Operate Correctly, Check The Electrical Supply Before A Replacement Hour Meter Is Installed{7480,1400}