1978/02/06 Caterpillar

Probable Causes Of Low Fuel Delivery During Testing On Fuel Injection Test Benches{0650,1250}

Usage:

There can be several causes for constant low fuel delivery from the separate injection pumps of pump housing groups during testing on Fuel Injection Test Benches. The first is worn or damaged plunger and barrel assemblies. Test bench operators can install new plunger and barrel assemblies and check the fuel delivery again.

If fuel delivery is still low, check the master valve (special fuel injection valve with a flat seat used as the standard resistance against which the fuel injection pump must work). To do this, exchange the master valve with a master valve that shows normal fuel delivery.

If the master valve checks correctly, look for a restriction at the ends of the fuel injection lines. Generally, restrictions are caused when the line fittings are tightened too tight or if they have been used for long periods of time. A.062" (1.57 mm) drill can be used to clean the lines of these restrictions.

Troubleshooting problems like these will be added to Special Instruction Form GEG00451-01, "Using the Caterpillar Fuel Injection Test Bench", when revisions are made.

Caterpillar Information System:

1978/02/06 New Water Temperature Regulator Opens At 180°F (82°C){1350,1355,7304}

1978/02/06 Successful Engine Service-3208 Engine Booklet Is Available{1000}

1978/02/06 Stronger Clutch Housing Used In Variable Capacity Torque Converter{3102}

1978/02/06 Add New Measurement And Identification To FT904 Backlash Indicator{0653,3258}

1978/02/06 Adjustment Of Track Tension On Machines With One Carrier Roller Per Side{4150}

1978/02/06 Silicone Sealant Is Now Used To Keep Water Out Of The Steering Clutch Case{4059,4100,4106,4115}

1978/01/30 Air Line For Air Compressor Governor Now Connected To Outlet For Wet Air Tank{4272,1065,4278}

1978/01/30 Retaining Ring Of A New Design Now Used In Torque Converter Group{3100}

1978/01/30 Do Not Change Factory Fuel Or Speed Settings On Truck Engines Unless New Settings Are Certified Under Applicable EPA Regulations{0336,0337,1257}

1978/01/30 Breather For Transmission Case Now Made Of Metal{3150}

1978/01/30 New Water Pump Cover Has A Baffle And Wall To Send Coolant Flow From Bypass Line Directly Into Water Pump{1361}

1978/01/30 New Spring Used In Belt Tightener And/Or Fan Drive Groups{1358,1359}

1978/02/13 Replacement Seal Group For Water Pump Impeller Now Has All The Seal Parts Plus An Installation Tool{1361,0622}

1978/02/13 Complete Set Of Contact Points For Dial Indicators Is Now Available In One Group{0653}

1978/02/13 Several Improvements Made To Lines Group In Area Of The Hitch{5057,5077}

1978/02/13 Improvements Made To Push Frame; Instructions To Make Reinforcements On Earlier Push Frames Available{6225}

1978/02/13 Strip Added Under The Hinge For The Front Windshield On ROPS Cabs{7325}

1978/02/13 Check Degree Number On Timing Fixture Plate Assemblies{0650}

1978/02/20 New Transmission Valve Groups Increase Winch Line Pull When Transmission Is In Neutral{3150,3152,3157,3167,3100}

1978/02/20 Separate Parts Of Tire Valve Group Now Available For Parts Service{4202}

1978/02/20 Reinforcements For Front Frame{7051}

1978/02/20 Improved Lift Arm And Service Brace Now Used{0643,5102,6119}

1978/02/20 Muffler Mounting Group Now Used To Give More Support To Muffler{1062}

1978/02/27 Use New Thickness Gauge To Check For Reusability Of Transmission Disc Assemblies Made From F37 Clutch Friction Material{0653,3155}