1977/04/22 Caterpillar


Stronger Material Used In Undersize Connecting Rod Bearings

Usage:


D346, D348, D349 Engines In All Applications

Reference: "Improved Connecting Rod Bearing With Higher Strength Aluminum Alloy", July 8, 1976 Engine News, Page 2.

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:

1977/04/22 New Piston Pin Bearing Used In Connecting Rod Assembly
1977/04/22 Tools To Remove Wear Sleeves From Crankshafts
1977/04/22 Improved Mounting For Expansion Tank
1977/04/22 New Oversize Connecting Rod Bearings Have Improved Design And Material
1977/04/06 List Of Service Publications
1977/04/06 New Diaphragm Used In Brakesaver Control Valve
1977/04/06 Revision Of Engine Data Sheet Gives Important Information On Single-Bearing Generators Assembled To Cat Engines
1977/04/06 Coolant Flow Warning System Can Be Adapted To Many Earlier Models
1977/04/06 Use Insert To Repair Bearing Seat In Water Pump Housing
1977/04/06 New Shaft Assemblies Used For Forward And Reverse Clutch And Stronger Nipple Used At Oil Pump
1977/04/06 New Retainer And Improved Housing Keep Water Pump Bearing Tight; Repair For Loosened Bearing
1977/04/06 Loose Bolts And/Or Bracket Can Cause Air Compressor Failures
1977/04/22 List Of Service Publications
1977/05/03 Special Tools For Complete Repair Of Water Pump In Direct Injection Engines
1977/05/03 Improved Cylinder Block With Spacer Plate Used With New Cylinder Heads, Cylinder Head Gaskets, Cylinder Liners And Timing Gear Housing
1977/05/03 New Socket Assembly To Tighten The Bolts That Fasten The Sleeve Levers To The Sleeve Shaft
1977/05/13 New 5P4185 Fuel Pump Timing Pin To Be Used Only On 3408 And 3412 Engines
1977/05/13 New Information On Caterpillar Cooling System Inhibitor
1977/05/13 New Crankshaft Front Seal And Wear Sleeve Permit Crankshafts With Seal Wear To Be Used Again
1977/05/13 Guide Assembly For Dipstick (Oil Level Gauge) Now Has Thicker Walls
1977/05/13 Improved Air Cleaner Group
1977/05/13 Improved Keystone Piston Assembly
1977/05/13 Gasket For Water Temperature Regulator Now Has Larger Vent Passage
1977/05/13 New Fuel Nozzle Assembly Available
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