1979/03/12 Caterpillar

New Fuel Injection Lines Groups Use A Different Fuel Injection Nozzle Assembly{1254}

Usage:

3406, 3408, 3412 Industrial, Marine And Vehicular Engines With Precombustion Chambers

SUPPLEMENT: 10/22/79

SERVICE MAGAZINE, MARCH 12, 1979, PAGE 12. The article "New Fuel Injection Lines Groups Use A Different Fuel Injection Nozzle Assembly" tells about the use of a new 7N9843 Fuel Injection Nozzle Assembly in place of the former 4N1251 Fuel Injection Nozzle Assembly. At the time the article was written, the new nozzle was used in all 3406, 3408 and 3412 Engines except truck engines because of emission control regulations.

The new 7N9843 Fuel Injection Nozzle Assembly is now approved, and is used in 3406 and 3408 Truck Engines in place of the former nozzle assembly. For this reason, cancel the last sentence of the above article.

--------------- END SUPPLEMENT ---------------

Description of Change: New fuel injection lines groups are used on the above engines. The new lines groups use a different fuel injection valve nozzle assembly that gives longer service life. The new fuel nozzle uses a horse shoe shape spring retainer. Formerly, a split retainer was used.

Adaptable As: The new 7N9843 Fuel Injection Valve Nozzle Assembly can be used in place of the former 4N1251 Fuel Injection Valve Nozzle Assembly on the engines shown. The 4N1251 Fuel Injection Valve Nozzle Assembly is still available for parts service. The new 7N9843 Fuel Injection Valve Nozzle Assembly must not be used on Truck Engines because of emission control regulations.

Caterpillar Information System:

1979/03/12 Magneto Improvements{1413}

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

1979/03/12 Check Valve Must Be Adjusted Correctly To Let Fuel Flow Through The Return Line And Back To The Tank{1275,1253,1274}

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}

1979/03/19 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}

1979/03/26 Drawing Available For FT1439 Lifting Beam{0644}

1979/03/26 New Fabricated Tools Available For Service Work On 7211 And 7221 Marine Transmissions{0621,0622,3302,3305}

1979/03/26 New Oil Jet Tube In Cylinder Block Gives More Clearance For Pistons And Connecting Rods{1201}