1977/10/24 Caterpillar

Replacement Bearings Have Aluminum Alloy With More Strength{1203,1213,1230}

Usage:

3406, 3408 and 3412 Engines In All Applications

Reference: Service Magazine, January 17, 1977, Page 2, "Improved Main and Connecting Rod Bearings Have Aluminum Alloy With More Strength".)

Description of Change: The reference article gave a description of the improved main and connecting rod bearings used on the above engines. These are the standard size bearings for use on crankshafts with wider bearing journals. At that time, replacement bearings were not available.

Replacement main and connecting rod bearings are now available for 3406, 3408 and 3412 Engines in all applications. Also available are the standard, oversize and undersize bearings for earlier 3406 Engines equipped with crankshafts that had narrow bearing journals. All of these replacement bearings and standard bearings are made of the same aluminum alloy. These bearings also have the advantages shown below:

1. Better resistance to cavitation.

2. Stronger bond (method to fasten) between the aluminum alloy and steel.

3. Improved service life.

Adaptable As: Direct replacement. The charts that follow give a complete list of the standard bearings, standard replacement bearings, and the oversize and undersize replacement bearings.

Caterpillar Information System:

1977/10/24 New Piston Group Has Improved Iron Band In The Piston Body{1214}

1977/10/24 Adjust Shop Tire Pressures For Operation In Cold Temperatures{4203,4204}

1977/10/24 Assembly Procedure For The 5P4721 Tube (Part Of The 5P4149 Conversion Group And 5P4150 Nozzle Testing Group){0650}

1977/10/17 Vent Tube Added To Jacket Water Aftercooler{1063}

1977/10/17 Separate Parts Of Oil Pump Cover Now Available{1304,1314}

1977/10/17 Improved Main, Thrust And Connecting Rod Bearings Have Aluminum Alloy With More Strength{1230}

1977/10/17 Preparation Of Truck Engines For Cold Weather Operation{1300,1000}

1977/10/17 Fabricated Extension Prevents Fuel "Splash" During Injection Valve Testing{0650,1254}

1977/10/10 If The Fuel Setting Dimension Is More Than 7.00 MM, Remove The End Play Of The Camshaft To Make The Fuel Setting{1257,1286}

1977/10/10 Improved Oversize And Undersize Connecting Rod And Main Bearings With Higher Strength Aluminum Alloy{1203,1219,1230}

1977/10/10 Use Only The Larger Size Inserts To Make A Repair To Cylinder Block Counterbores For Cylinder Liners{1201,1216,1217}

1977/10/10 Troubleshooting The Tachometer System Of The 4S6553 Engine Instrument Group{0651}

1977/10/31 New Hydraulic Flow Meter Has Many Improvements To Make It Easier, Faster And Safer To Use Than The Former Flow Meter{0651,5050}

1977/10/31 New Governor Spring Changes Speed Regulation{1264,1286}

1977/10/31 With New 5P7448 Adapter, Earlier Fuel Injection Valves And Nozzles Can Be Tested And Adjusted On The 5P4150 Nozzle Testing Group{0651,1254}

1977/10/31 Some Wobble Is Acceptable In Rubber Vibration Dampers For Crankshafts{1205}

1977/11/07 Crankshaft Support Groups Are Available To Measure Bent Crankshafts{0653,1202}

1977/11/07 Improved Crankshaft Main Bearings And Connecting Rod Bearings With Higher Strength Aluminum Alloy{1203,1219,1230}

1977/11/07 Precision Oil Pump Bearings Now Available{1304}

1977/11/14 New Electric Starting Motor Has Longer Brush Life{1453}

1977/11/14 Exhaust Valves With 30° Face Angle Now Used For Parts Service{1101,1103,1105}

1977/11/14 New Exhaust Manifolds Made Of Stronger Material{1059}

1977/11/21 New Elbow Between Turbocharger And Air Inlet Manifold Has Hole For Ether Starting Aid{1058,1456}

1977/11/21 New Crankshafts Do Not Have Lightening Holes And Lubrication Passages Connected Together{1202,1219}