Later Pistons Have A Smaller Number Of Drain Holes In Oil Ring Groove{1214,1213}
Usage:
3406, 3408, 3412 Industrial and Marine Engines;
3406, 3408 Truck 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:
1981/02/23 New Governor Spring Available For Specific Engine Applications{1264,1265}
1981/02/16 Different O-Ring Seal Now Used On The Oil Pump Suction Tube{1307,1304}
1981/02/16 New O-Ring Seal Used In EGR (Exhaust Gas Recirculation) Control Has Better Resistance To Heat Damage{1080}
1981/02/16 New Publication: Engine Bearings And Crankshafts{0374}
1981/02/02 New Camshaft Has Improved Profile (Shape) Of Exhaust Cam To Extend Service Life{1210}
1981/02/02 Elbow With Orifice Now Used In Regulator And Housing Groups For Cooling Systems{1355,1361}
1981/02/02 Aluminum Identification Plate No Longer Used On Torque Converters; Identification Numbers Put Directly On Converter Housing{3101}
1981/02/02 Corrected "5.4" 60°V Main Bearing Selection Guide" Is Now Available{0374,1203,1202}
1981/02/02 New, One-Piece Valve Lifter Used{1209}
1981/02/02 New Exhaust Manifold Has Slip-Joint Connections{1059,1061}
1981/02/02 6V3129 Nozzle Puller Group And FT1533 Nozzle Assembly Adapter Can Be Used To Remove Fuel Nozzles{0621,1254}
1981/01/26 Use 2P2333 Manifold Sealer On Exhaust Manifold Slip Joints (Junction) During Assembly{1059}
1981/02/23 Two New Oil Filter Assemblies Available; Always Use Correct Oil Filter And Follow Caterpillar Change Intervals{1318}
1981/02/23 Do Not Adjust The Fuel Setting Or High Idle Higher Than Necessary{1257}
1981/02/23 6V4163 Bit And 6V4164 Driver Now Available For Removal Of Bolts For Flyweight Carrier{0612,1264}
1981/02/23 Pipe Plug Added To Rear Of Cylinder Block Prevents Oil Leakage Into Flywheel Housing{1201}
1981/02/23 Changes Made To Power Cord Plugs On 5P6532 And 5P6533 Reader Projectors{0160}
1981/03/02 Changes Have Been Made To Some Caterpillar Service Publications{0375}
1981/03/02 High Concentration Of Aluminum In Oil Analysis Can Be The Result Of Rocker Arm Support Wear{1318,1102}
1981/03/02 Two New Exhaust Manifolds Available For Replacement Of Single Rear Manifold To Prevent Broken Studs{1059}
1981/03/02 Modification Of Flywheel Prevents Loose Clutch Pilot Bearing{1155,1156}
1981/03/02 Check Oil Level Carefully To Prevent Operation With Too Much Oil In Engine Crankcase{1316}
1981/03/09 Correct Preparation Is Important To Prevent Damage During Extended Periods Of Storage{7500}
1981/03/09 New Poppet Valves And Piston Available As Replacement Parts; Automatic Center Punch Can Be Used To Install Piston{3012,0622,0626,3166,3185}