1993/07/26 Caterpillar

Diesel Truck Engine Smoke Limits{1250}

Usage:

All 3306 and 3406 Truck Engines

Reference: Service Magazine; September 2, 1991; Page 8; "California Laws Target Excessive Smoke."

Some states, such as Illinois, have adopted new laws placing restrictions on truck engine smoke emission levels. These states have patterned laws after those enacted in California. The new laws regulate smoke by measuring smoke opacity during a snap idle, no-load acceleration test. The test is for all on-road vehicles over 8000 lbs GVWR.

The smoke level is measured by an opacity meter and documented with a strip chart recorder. The smoke limits in Illinois are 55% opacity maximum for all pre-1991 model year engines and 40% opacity for 1991 and later model years.

In Illinois, the strict enforcement of the new regulations and the date of implementation have not been established. However, regardless of the new smoke regulations, it is very important to follow the maintenance recommendations in the Operation and Maintenance Manual in a timely manner to help ensure optimum engine performance. The presence of excessive smoke may indicate an engine that is out of adjustment and/or suffering from excessive component wear. Excessive smoke can also be an indicator of poor fuel economy and performance.

Caterpillar Information System:

1993/07/26 Engine Changes For 350 Hp{1022}

1993/07/26 Compressor Nut Torque For Schwitzer Turbochargers{1052}

1993/07/19 Prechamber Rust Removal{1106}

1993/07/19 Regulator Assemblies Available To Service Thermostatic Valve Groups{1355}

1993/07/19 Manifold Pressure Variation at Full Load/Constant Speed{1058}

1993/07/12 The Latest "Gas Engine Installation Drawings" Are Available{0374}

1993/07/12 Preventive Maintenance To Reduce Risk Of Stator Failure{1404,4453}

1993/07/12 Improved Voltmeters Available{7450}

1993/07/12 Magnetic Switches (Relays) May Be Intermittent{1400}

1993/07/05 New Cast Iron Inlet Adapter And Impeller For Water Pumps {1361}

1993/07/05 New Water Pump Groups Use Tapered Roller Bearing {1361}

1993/07/05 New Stronger Elbow Used In Marine And Fire Pump Engine Water Lines Groups {1380}

1993/07/26 G3400 Engine Performance Manual{0376}

1993/07/26 New Exhaust Manifold End And Center Sections Used In Dry Type Exhaust Manifold Groups{1059}

1993/07/26 Improved Mounting Reduces Vibration To Liquid Level Switch{7470}

1993/07/26 New Flame Arrestor{1050}

1993/07/26 Service Life of Crankshaft Gears Can Be Extended{1204}

1993/08/02 New Tube Assemblies Used In Air Lines Group Allow Greater Movement{1058}

1993/08/02 Maintaining The Proper Coolant Level In The Radiator{1353}

1993/08/02 Battery Acid Fill Machine May Be Damaging Batteries{1401}

1993/08/02 New Magneto And Magneto Drive{1552}

1993/08/02 Resistor Added To Magneto Shutdown Circuit Protects Shutoff Contactors{1552}

1993/08/02 Center Mating Parts Of Air Inlet Piping Extends Service Life{1058}

1993/08/02 Use Molycoat Paste Lubricant On Cylinder Head Bolts{1100}