1983/04/27 Caterpillar

Pistons With Thicker Top Rings Must Be Used In Correct Applications

Usage:

All 3400 Series Engines

Reference: Engine News, December 15, 1982, Page 3. In the article, "New Piston Group Has A Thicker Top Ring," you were told about the availability of new piston body assemblies which use a thicker top ring.

These new pistons have a wide taper in the pin boss area. They were designed to be used with wide taper connecting rods. Engine damage can result if these pistons and connecting rods are not used together, correctly.

These new pistons can be used with the earlier connecting rods with the narrow taper in 3406 and 3412 Engines if all the pistons are the same design.

These pistons cannot be used on 3408 Engines with the narrow taper connecting rods because they will cause engine vibration. They cannot be used on any 3400 Series Engines with connecting rods which are the straight design.

Caterpillar Information System:

1983/04/27 Changes To Valve Clearance Settings

1983/04/27 New Shutoff Solenoid Group Used

1983/04/27 8S1603 Socket Group For Use On Bolts With 12 Point Heads

1983/04/27 List Of Service Publications

1983/04/27 Use The 6V5000 Infrared Thermometer Group To Measure Temperatures

1983/03/16 "Gas Engine Application And Installation Guide" Now Available

1983/03/16 Use FT1783 Fixture To Drill Vent Holes In Impeller

1983/03/16 New Turbocharger Inlet Tube Assembly And New Seal Available

1983/03/16 Engine Valve Stem "Use Again" Specifications

1983/03/16 Additions To Reference Chart For Major Production Changes

1983/03/16 New Instruction Decal Used On 6V4060 Engine Set Point Indicator

1983/03/16 Check Cylinder Bores For Chamfer During Reconditioning

1983/04/27 New Special Instruction Available For 6V4135 Halogen Leak Detector

1983/04/27 Remove Plastic Plug From Fuel Transfer Pump

1983/04/27 New Gasket And Cover Used On Governors

1983/04/27 Improved Valve Springs Available

1983/04/27 Change 6V3060 EGR Testers To LES Testers

1983/04/27 Valve Spring Retainers Now Have Thicker Flanges

1983/04/27 New Specifications For Installation Of Crankshaft Counterweight Bolts

1983/04/27 New Washer And Bolts Keep Fan Drive Tight

1983/04/27 Balancer Shaft And Gear Now Available Separately

1983/04/27 Oil Passage Plugs Are No Longer Installed In Crankshafts For Parts Service

1983/04/27 Use Of 9S3265 Retaining Compound On AiResearch Turbocharger Compressor Wheel Retainer Nuts

1983/04/27 Labyrinth-Type Seal Ring Available For Rear Power Takeoff