Stronger Material Used In Undersize Connecting Rod Bearings{1219}
Usage:
D346, D348, D349 Engines In All Applications
Reference: "Improved Connecting Rod Bearing With Higher Strength Aluminum Alloy", June 28, 1976 Service Magazine, Page 6.
Description of Change: The reference article told about the use of a new 6N6991 Connecting Rod Bearing (standard size) made of improved material, in place of the former 6N6918 Connecting Rod Bearing. The improved material is also used in the 6N7042 Connecting Rod Bearing (standard size outside diameter-.025" undersize inside diameter) and the 6N7047 Connecting Rod Bearing (standard size outside diameter-.050" undersize inside diameter). All 6N7042 and 6N7047 Connecting Rod Bearings have been made of this stronger material.
Caterpillar Information System:
1977/04/18 New Crankshaft Front Seal And Wear Sleeve Permit Crankshafts With Seal Wear To Be Used Again{1151,1160}
1977/04/18 Tools To Remove Wear Sleeves From Crankshafts{0621,7558}
1977/04/11 New Diaphragm Used In Brakesaver Control Valve{1159}
1977/04/11 New Shaft Assemblies Used For Forward And Reverse Clutch And Stronger Nipple Used At Oil Pump{3302,3306,3307,3310,3314}
1977/04/11 Improved Mounting For Expansion Tank{1354,1379,1380}
1977/04/11 New Retainer And Improved Housing Keep Water Pump Bearing Tight; Repair For Loosened Bearing{1361}
1977/03/21 New Spring Used In Fuel Ratio Control{1278}
1977/03/07 Cooling System Orifice Changed For Better Flow Control And Air Removal{1380}
1977/03/07 Use Insert To Repair Bearing Seat In Water Pump Housing{1361}
1977/03/07 Drains In New Fuel Injection Pump Housing And Governor Housing Prevent Possible Corrosion And Freezing Damage{1286}
1977/03/07 Improved Shut-Off Solenoids For Engines Equipped With Sleeve Metering Fuel Systems{1259}
1977/03/07 Relief Valve Added To Lubrication And Testing Group For Sealed And Lubricated Track{0651,0671,4175}
1977/04/18 Gasket For Water Temperature Regulator Now Has Larger Vent Passage{1355,7555}
1977/04/18 Guide Assembly For Dipstick (Oil Level Gauge) Now Has Thicker Walls{1300}
1977/04/25 Alternator Groups With Slower Drive RPM Used Again{1205,1405}
1977/04/25 New Piston Pin Bearing Used In Connecting Rod Assembly{1218}
1977/04/25 New Oversize Connecting Rod Bearings Have Improved Design And Material{1219}
1977/04/25 Improved 5P3000 Engine And Transmission Shipping Stand Assembly; Modification Available For Stands Already In Use{0640}
1977/04/25 Revision Of Engine Data Sheet Gives Important Information On Single-Bearing Generators Assembled To Cat Engines{1156,4450,0354}
1977/04/25 New Socket Assembly To Tighten The Bolts That Fasten The Sleeve Levers To The Sleeve Shaft{0621,1250}
1977/05/02 Improved Cylinder Block With Spacer Plate Used With New Cylinder Heads, Cylinder Head Gaskets, Cylinder Liners And Timing Gear Housing{1101,1162,1201,1216}
1977/05/02 Improved Keystone Piston Assembly{1214,1216}
1977/05/02 Special Tools For Complete Repair Of Water Pump In Direct Injection Engines{0620,1361}
1977/05/09 Special Torque Wrenches Use Noise As Indication Of Correct Torque Application{0614}