1999/04/01 Caterpillar

Be Sure To Use The Correct Gas Fuel Pressure{1250,1270,1293}

Usage:

G3508 (4WD, 9TG, 9AW),
G3512 (5JD, 7NJ, 6JW, 5ZZ),
G3516 (8LD, 4EK, 8PW, 8JZ) Engines

The correct gas fuel pressure must be supplied to the engine in order for the engine to operate properly. Engines with different types of fuel systems require different gas pressures. These different types of fuel systems are available for the engines listed above:

* LE (Low Emission) with high pressure gas

* LE with low pressure gas

* Standard (stochiometric) with high pressure gas

* Dual fuel arrangement with a carburetor for high pressure gas and a carburetor for low pressure gas

* Dual fuel arrangement with two parallel low pressure gas carburetors

Fluctuation of the gas pressure will change the air/fuel ratio. This can have an adverse effect on operation and on emissions. To provide stable operation, the variation of the gas pressure is limited. This tolerance depends on the fuel system pressure.

The following chart lists the different types of fuel systems with the corresponding ranges of gas fuel pressure and the variations in pressure that can be tolerated.

NOTE: Some sites require exceptions to the gas fuel pressures that are recommended in the following chart. The exceptions are recommended by the factory. Consult the factory for information on exceptions.

Caterpillar Information System:

1999/04/01 New Exhaust Manifold Group Seals Provides Improved Exhaust Gas Sealing{1059}

1999/04/01 Re-Alignment Warning Tag On All 3500 Generator Sets Reminds Of Alignment Required At Installation{1021}

1999/04/01 New Oil Pump Group Used{1304}

1999/04/01 Use 154-8100 Fuel System Arrangement And 154-8101 Fuel System Group To Measure Engine Fuel Flow{1250,0782}

1999/04/01 New Fuel Shutoff Solenoids With Improved Durability Available{1259}

1999/04/01 Use 157-3716 (Exhaust) And 157-3717 (Intake) Valve Seat Drivers To Install Valve Seats In Engines With Unfinished Valve Guides{1103,0703}

1999/04/01 Needle Valve May Be Needed To Accurately Measure Engine Return Fuel Flow{1250,0782}

1999/04/01 Use 156-1060 Gas And 156-1070 Gas And Diesel Engine Analyzer To Check Emissions{1088,0781}

1999/04/01 New 153-9630 Sensor Test Group Adapter Kit For DataView Now Available{1000}

1999/04/01 New Caterpillar High Efficiency Fuel Filters With STAY CLEAN VALVES® Replace All Standard Fuel Filters In February Of 1999{1261}

1999/03/01 10W Hydraulic Oil Recommended For G3600 Hydraulic Actuators (HYDRAX) {5050,5095}

1999/03/01 Special Instructions For Converting To Hydraulic Actuator System (Hydrax) Now Available {1716}

1999/04/01 Using The Correct Diode When Using The Customer Communication Module In Multiple Engine Applications{1902,0374}

1999/04/01 Heinzmann Wastegate Actuator Relocated{1057}

1999/04/01 New Cover And Plate Assembly Used In Oil Level Contactor Groups To Help Resist Vibration Damage{1326,7450}

1999/04/01 Protection From Paint Is Required For The G3600 Hydraulic Actuator (Hydrax) Shaft{1909,7581}

1999/04/01 New 155-5175 AC Current Probe For Generator Sets Now Available{1400,4450}

1999/04/01 Improved Data Logger Feature For Customer Communication Module{1926}

1999/04/01 Special Instruction, REHS0345-01, "Generator Service Literature Index" Is Available{4450}

1999/04/01 Updated 133-6350 EMCP II Generator Set Control Group Corrects Hourmeter Programming and Spare Fault Operation{4490}

1999/04/01 New Control Panel Films Show That SR4B Generators Are Not To Be Wired In The Delta Configuration{7557,7566}

1999/05/01 Use 157-3722 Driver To Remove And Install Engine Valve Guides{0703,1104}

1999/05/01 Cold Start Advance Solenoid Available{1272,1250}

1999/05/01 New Design Of Cylinder Block And Main Bearings{1201,1203,1224}