1987/08/10 Caterpillar

Fuel Heaters Should Be Thermostatically Controlled Or Self-Regulated{1250,1260,1296}

Usage:

3406B ( 8TC ) PEEC Truck Engines

Reference: Service Magazine; February 16, 1987; Page 12, "Incorrect Use Of Fuel Heaters Can Reduce Engine Power" on all truck engines.

Only fuel heaters that have thermostats or are self-regulated should be used on 3406B Truck Engines with PEEC (Programmable Electronic Engine Control). As stated in the Reference Article, either the 7C3557 or 7C3558 Heater Kit, both available from Caterpillar, is recommended. Both heaters offer good protection against cold weather fuel problems without the risk of overheating the fuel.

The temperature of the inlet fuel to the transfer pump on PEEC engines must NOT exceed 65°C (150°F). A higher fuel temperature reduces the life of the electronics and transfer pump check valves, and also reduces horsepower output. Fuel heaters that are not automatically controlled can heat the fuel above 65°C (150°F).

The PEEC control module is cooled by fuel, but the heat transferred to the fuel is not sufficient to eliminate the need for a heater in cold weather operation. Fuel was selected to cool the unit because there is always flow during engine operation and it has a relatively low temperature. Fuel flows from the tank to the primary filter, through the transfer pump, through cored passages in the electronic control module housing to the secondary filter, and to the injection pumps.

Caterpillar Information System:

1987/08/10 Improved Gaskets Used In Central Structure Cover Groups, Jacket Water Lines Groups, Jacket Water Heater Groups And Water Aftercooler Groups{1350,1063}

1987/08/03 New Caterpillar Sea Trial Rules Of Thumb Pocket Reference Card {0372}

1987/08/03 Temperature Regulator Housing Parts And Water Pump Adapter Have More Resistance To Erosion And Galvanic Corrosion; Guidelines On Grounding Of Electrical System And Cooling System Maintenance {1350,1361,1393,1400}

1987/08/03 New Performance Analysis Report (PAR) Brochure And Directory Of Par Dealers Available {0370,1000}

1987/08/03 Remanufactured Short Blocks Available For All 3304 Engines {1200}

1987/08/03 New Service Tools Available {0600}

1987/08/03 More Test Gauges, Adapters And Hoses Available For All Power Shift Transmissions And Hydraulic Systems {0783,0784,3150,5050}

1987/07/27 Box Labels Available For Pleasure Craft Cruise Kits{1000}

1987/07/20 Gas Regulator Setting Tool Group Available {0782}

1987/07/20 Remanufactured Electronic Modular Control Panel Modules (EMCP) For Package Generator Sets {7002}

1987/07/20 Additional Guidelines For Using The 8T2700 Blowby/Air Flow Indicator Group {0781,1200,1350}

1987/07/20 New Cylinder Liner Available {1216}

1987/08/10 Remanufactured Turbocharger Groups And Cartridges{1052,1053}

1987/08/24 More Accurate And Easier Method To Adjust 8T1815 Or 6L5438 Main Shaft Bearing{3306,3351}

1987/08/24 Improved High Temperature Seals Available{1252,1120}

1987/08/24 Engine Oil Refill Capacity Decreased{1213,1326}

1987/08/24 Additional Engine Tilt Installation Angles And Engine Dipstick Markings{1326}

1987/08/24 Dynamic Timing Charts Available For Most Popular 3208 And 3406 Truck Engine Ratings{1272}

1987/08/24 New 8T8697 Electronic Control Analyzer Programmer (ECAP), 8C5919 Electronic (ECAP PEEC) Conversion Group and 8T5275 Adapter Cable Assembly (T-Harness Cable) Available{0600}

1987/08/24 New 8T5282 Programmable Electronic Engine Control Digital Diagnostic Tool Group (PEEC DDT) Available{0600}

1987/08/24 New 8T8726, 8T8694 And 8T8695 Adapter Cable Assemblies Available{0600}

1987/08/31 Improved Clutch Piston And Retraction Pins Available {3302}

1987/08/31 Recommendations For Preventing Cooling System Damage {1201}

1987/08/31 Metal Protectors Replace Plastic Protectors On Head Studs {1100}