Later Pistons Have A Smaller Number Of Drain Holes In Oil Ring Groove
Usage:
3406, 3408, 3412 Industrial and Marine Engines
Some dealers have desired information about a change which was made to pistons for the 3400 Series Engines. The piston design was changed to use a total of four oil drain holes in the bottom ring groove, in comparison with the fourteen holes formerly used. The four holes are drilled only at the sides of the piston body, two holes on each side. This change in the number of drain holes has no effect on engine oil consumption.
Caterpillar Information System:
1981/03/04 List Of Service Publications
1981/03/04 Two New Oil Filter Assemblies Available; Always Use Correct Oil Filter And Follow Caterpillar Change Intervals
1981/03/04 Changes Have Been Made To Caterpillar Service Literature
1981/03/04 High Concentration Of Aluminum In Oil Analysis Can Be The Result Of Rocker Arm Support Wear
1981/01/28 Corrected "5.4" 60°V Main Bearing Selection Guide" Is Now Available
1981/01/28 New, One-Piece Valve Lifter Used
1981/01/28 New Camshaft Has Improved Profile (Shape) Of Exhaust Cam To Extend Service Life
1981/01/28 New Aftercooler Core Has Copper-Nickel Tubes For Increased Strength
1981/01/28 New Exhaust Manifold Has Slip-Joint Connections
1981/01/28 Inspection And Test Procedures To Follow When Fuel Ratio Control Does Not Operate Correctly
1981/01/28 Pipe With Orifice Now Used In Regulator And Housing Groups For Cooling Systems
1981/01/28 New Chart Has "D379, D398, D399 Lubrication And Maintenance Checklist"
1981/03/04 Pipe Plug Added To Rear Of Cylinder Block Prevents Oil Leakage Into Flywheel Housing
1981/03/04 Check Oil Level Carefully To Prevent Operation With Too Much Oil In Engine Crankcase
1981/03/04 Two New Exhaust Manifolds Available For Replacement Of Single Rear Manifold To Prevent Broken Studs
1981/04/01 Special Studs And Nuts Available For Exhaust Manifolds On Engines Used In Heavy Load Conditions
1981/04/01 6V4163 Bit And 6V4164 Driver Now Available For Removal Of Bolts For Flyweight Carrier
1981/04/01 Brass Plug Now Used Instead Of Steel Plug In Sea Water Aftercooler
1981/04/01 New Inlet And Exhaust Valves And Valve Guides Have Tighter Fit To Prevent Corrosion And Guide Wear
1981/04/01 Different O-Ring Seal Now Used On The Oil Pump Suction Tube
1981/04/01 New Shield Assemblies Used In Water Shielded Manifold Group
1981/04/01 Test Procedure For Exciter Reactors On SRSE Generators
1981/04/01 Correct Installation Of Inserts Necessary During Repairs To Prevent More Counterbore Cracks
1981/04/01 6V4009 Dowel Driver Available