New Pistons Used
Usage:
3406B Truck Engines
Reference: Truck Engine News; June 1988; Page 3; "Piston Application Guide " for 3406B Truck Engines.
Truck Engine News; December 1989; Page 3; "New Turbocharger, Piston And Fuel Ratio Control Used" for 3406B Truck Engines.
Two new pistons are used in the 3406B Truck Engines. The new 7E8885 Piston has a 15.6:1 compression ratio, while the new 7E0539 Piston has a 15.2:1 compression ratio. Both pistons use a 12.0 mm (.47 ") low crevice volume (LCV) design which provide improved emissions and performance. See Illustration 1.
Illustration 1. The 7E8885 and 7E0539 Pistons have a low crevice volume (LCV) design.
See the chart for the effectivity and use of the new pistons.
Caterpillar Information System:
1990/08/01 New Rotary Solenoid (Brushless Torque Motor) Used In PEEC Engines
1990/08/01 Effective Dates, Serial Numbers And Features Of PEEC Personality Modules
1990/07/01 List Of Service Publications
1990/07/01 Welding On Fuel And Hydraulic Tanks
1990/07/01 Electrical System Damage From High Voltage
1990/06/01 "Ugly's Electrical-References " SEBD0983, Now Available
1990/06/01 Improved Manufacturing Process Extends Service Life Of New Exhaust Valves
1990/06/01 Procedure To Measure Cylinder Liner Projection On 3176 Truck Engines
1990/06/01 New Bolt And Spacer Used In Exhaust Manifold Group To Improve Gasket Retention
1990/06/01 New Fuel System Components For 3176 Truck Engines
1990/06/01 New Fuel Transfer Pump Group Has New Check Valve Location
1990/05/01 New Operation And Maintenance Manual For 3306B Truck Engines
1990/08/01 Coolant Loss In 3406B Truck Engines
1990/08/01 New Caterpillar Parts Identification Label
1990/09/01 Sealing Threads On Switches And Sensors That Are Grounded Through The Case
1990/09/01 New Service Tools Available
1990/09/01 Correct Light Bulb Replacement For The 8T9290 Borescope; New Light Bulb Used
1990/09/01 Incorrect Throttle Adjustment Can Cause Engine Surge
1990/09/01 New Remanufactured 0R6183 Control Group (Personality Module) Available
1990/10/01 Setscrew And Nut Available For Fuel Setting And Injector Synchronization
1990/10/01 Price Adjustments On Service Program Modules
1990/10/01 Improved 7C1757 Exhaust Manifold Group
1990/10/01 Front Trunnion Bolts May Come Loose
1990/10/01 Increased Capacity Oil Sumps Require Additional Oil And Different Maintenance Interval