1981/02/16 Caterpillar

Different O-Ring Seal Now Used On The Oil Pump Suction Tube{1307,1304}

Usage:

All 3406, 3408 And 3412 Engines In All Applications

Reference: This article is a replacement for the earlier article with the same title on Page 9 of the December 1, 1980 Service Magazine. Cancel the original article and use the information that follows.

Description of Change: A different O-ring seal is now used where the oil pump suction tube connects to the oil pump on the above engines. The new seal is made of a fluorocarbon rubber, which has a light brown or tan color, and will keep its soft, flexible condition for a longer period of time under compression. The former seal is made of a silicone rubber which has a yellow color. This material can take a permanent shape under compression and let air into the pump suction line.

Adaptable As: Direct replacement in this application. The former seals are still available for other applications.

Either of two different size seals are used in the different oil lines groups for the above engines. Use a new 5P5846 O-Ring Seal in place of the former 9M9647 O-Ring Seal, or a new 8J4351 O-Ring Seal in place of the former 8M4443 O-Ring Seal.

Caterpillar Information System:

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}

1981/01/26 6V2009 Adapter Group Available To Test Scroll Fuel System On Fuel Injection Test Bench; Additional Parts Are Needed{0652}

1981/01/26 Use Scheduled Oil Sampling To Find Change Intervals For Hydraulic Oil{5068}

1981/02/23 New Governor Spring Available For Specific Engine Applications{1264,1265}

1981/02/23 Later Pistons Have A Smaller Number Of Drain Holes In Oil Ring Groove{1214,1213}

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}