1980/10/06 Caterpillar

New Timing Advance Weight Used{1272,1288,1286,1264}

Usage:

Direct Injection 3406 ( 90U, 91U, 92U ) Industrial, Marine And Truck Engines;
980C ( 63X ) And 983B ( 58X ) Loaders;
824C ( 85X ) 621B ( 45P, 35V ) And 623B ( 46P ) Tractors;
825C ( 86X ) And 826C ( 87X ) Compactors;
16G ( 93U ) Motor Graders;
245 ( 95V, 94L ) Excavators And 245 ( 82X, 84X ) Front Shovels

Description of Change: A new, improved timing advance weight is used in the above models. The new, steel weight has a larger spring pocket for more clearance between the spring and pocket than the former timing advance weight.

It was some times possible for the spring to make contact with the pocket in the former weight and become worn. The result was failure of the spring.

Adaptable As: The new 1W2284 Timing Advance Weight is a direct replacement for the former 7N6176 Timing Advance Weight which is canceled.

Two timing advance weights are used in a governor and fuel pump drive group in 3406 Engines.

Caterpillar Information System:

1980/10/06 Fretting Material Must Be Removed Before Installation Of New Bearings{1202,1203,1218,1219,1201,1230}

1980/09/29 Use Starter To Turn Crankshaft For 30 Seconds Or Until Oil Pressure Gauge Shows Pressure, Before Engine Is Started{1300,1450}

1980/09/29 Some Test Procedures And Specifications Changed For 9L6884 Fuel Injection Nozzle Assemblies{1254,0651}

1980/09/29 Woodward 2301 Speed Control (8N1731 Speed Control Group) Can Be Adapted For Use As Field Test Instrument{0651,1264,1265,1289}

1980/09/29 Improved Poppet Valves Used In Plate And Valve Assembly Of Transmission Control Group{3009}

1980/09/22 Install A New Oil Filter Element, Clean The Oil Lines And The Remote Filter Base; Turn The Engine Until The Oil Gauge Shows Pressure Before Starting A Rebuilt Engine {1307,1318}

1980/09/22 Do Not Use Room Temperature Vulcanizer Compounds Or Silicone Rubber Cements On O-Ring Seals In Engines; Do Not Use Too Much As Gasket Material {1000,7555}

1980/09/22 6V3071 Seal Guide Keeps Seal In Position During Installation Of Transfer Pump {0620,1256}

1980/09/15 Use Only Caterpillar Water Separator Elements{1263}

1980/09/15 Reference List Of Pistons Used With The Different Types Of Connecting Rods{1214,1218}

1980/09/15 Special Cup Plugs For Use In Oversize (Larger Than Standard Size) Bores In Valve Rocker Arm Shafts{1102}

1980/09/15 Reverse Flow Check Valves And Check Valves With A Groove Can Not Be Used In Place Of Each Other{1251,1272,1254}

1980/10/06 New Breather Groups Used{1317}

1980/10/13 6V3184 Brush Group Available To Clean Crankshaft Oil Passages{0622,1202}

1980/10/13 6V2156 And 6V2157 Link Brackets Now Available To Lift Heavy Loads{0644}

1980/10/13 New Tools Available For Installation Of Crankshaft Seals And Wear Sleeves{0622,1160,1161}

1980/10/13 6V3116 Adapter Group Is Available For Use On Fuel Injection Test Bench{0652,1251}

1980/10/13 Improved Temperature Control Switch Used On Machines Equipped With Air Conditioner Units{7320}

1980/10/13 Understand The Effects Of Extended Oil And Filter Change Intervals{0375}

1980/10/20 New Basic Oil Pump Groups Use Hardened Gears For Longer Service Life{1304}

1980/10/20 List Of Correct Fuel Injection Nozzle Assemblies To Use For Different Engine Applications{1254}

1980/10/20 Pressure Relief Fitting Added To Fan Drive Hub For More Positive Lubrication Of Front Bearing{1359}

1980/10/20 Crankshaft Now Has A Fillet Radius At Front Main Bearing Journal{1202}

1980/10/20 Before You Use Any Service Publication, Make Sure It's Current{0374}