1979/03/12 Caterpillar

Check Valve Must Be Adjusted Correctly To Let Fuel Flow Through The Return Line And Back To The Tank{1275,1253,1274}

Usage:

All 3304 And 3306 Engines Equipped With A Sleeve Metering Fuel System And A Return Line To The Fuel Tank

All 3304 and 3306 Engines equipped with a sleeve metering fuel system and a return-to-tank fuel line have a 4N1828 Elbow in the fuel injection pump housing. The 4N1828 Elbow has a check valve inside which controls the rate at which fuel flows back to the fuel tank. When the check valve adjustment screw is installed too far into the elbow, the force of the spring will not let the plunger come off the seat. When the plunger is against the seat, fuel can not flow to the fuel tank. This will cause air to become trapped (held) in the fuel injection pump housing. This restriction can make the fuel become hot and cause a loss of power.

The fuel must flow by the check valve at an approximate rate of 9 gallons per hour (34 liters per hour), when the engine is at normal operation rpm. If the flow rate is less than the rate given, back the adjustment screw out until the fuel flow rate is correct.

NOTE: To check the flow disconnect the return line to the tank and let the fuel flow into a separate container. A nine gallon per hour flow rate will fill a quart or liter container in less than two minutes.

4N1828 Elbow and Check Valve.

Caterpillar Information System:

1979/03/12 New Design Fuel Injection Valve Body Used In Fuel Injection Lines Group{1252,1254}

1979/03/12 SAE 15W/40 Multiviscosity Oil Can Be Used In Engines, Transmissions And Final Drives{1318,3067,3179,4070}

1979/03/12 New Manifold Assembly Gives More Room For The Lifting Eye{1059}

1979/03/12 Retroreflective Tape Makes Phototach Kit Easier To Read{0651,0653}

1979/03/12 New Larger Capacity Water Separator Is Available{1250}

1979/03/05 Engine Mounted Exhaust Brake Systems Can Be Used To Extend Service Brake Life{1050}

1979/03/05 New Oil Pan Assembly Uses An O-Ring And Plug For A Better Seal{1302}

1979/03/05 Improvements Made To Fuel Injection Pump And Governor Group{1253,1281,1286}

1979/03/05 New Fuel Injection Nozzles Are Used In 3208 Engines{1254}

1979/03/05 New Piston And Connecting Rod Are Tapered In Area Of Piston Pin{1213,1214,1218,1219}

1979/03/05 New Engine Cylinder Block Used{1201}

1979/03/05 Main Bearings Now Have Larger Diameter Oil Hole For Better Lubrication Of Main And Rod Bearings{1203,1219,1300}

1979/03/12 Larger Diameter Washer Is Used To Hold Air Transfer Pipe In Aftercooler Flange{1063,1058}

1979/03/12 Magneto Improvements{1413}

1979/03/12 New Fuel Injection Lines Groups Use A Different Fuel Injection Nozzle Assembly{1254}

1979/03/19 Maintenance Procedures For Extended FPTO Life On 3408 And 3412 Marine Engines{3055}

1979/03/19 New Oil Filter And Filter Base Assemblies{1306,1378,1318}

1979/03/19 Ether Starting Aid System Improves Cold Weather Starts{1456}

1979/03/19 Revision To Guideline For Reusable Parts Is Available{1105,1108,0374}

1979/03/19 8L4525 Flange Is Available Again For Parts Service Of 3192 Marine Transmissions{3314}

1979/03/19 New Woodward Governor Control Used On Diesel Engines; Former Control Now Used On Gas Engines Only{1265}

1979/03/26 Service Parts Available For the 5P8585 Leak Detector{0651}

1979/03/26 Window Cover Kit Now Available For ENM Service Meters{7478}

1979/03/26 Information About The Use Of Earlier Cylinder Heads And Liners With Spacer Plate Cylinder Blocks; List Of Earlier Articles{0600,1101,1162,1201,1216,1221}