VALVE GP-RELIEF 4T2742 - Caterpillar

Industrial, Marine And Generator Set EnginesSUPPLEMENT: 07/00/85ENGINE NEWS, JANUARY 16, 1985, PAGE 6.In the article "New Tools Available To Service Fuel Injection Nozzles And Adapters", put a mark through the subtitle, "3406B Industrial, Marine and Generator Set Engines". The correct subtitle is "3406B, 3408, 3408B and 3412 Industrial, Marine and Generator Set Engines". All references in the article to 3406B Engines should also include 3408, 3408B and 3412 Engines.
--------------- END SUPPLEMENT ---------------Reference: Engine News, October 24, 1984, Page 3, New Cylinder Heads, Fuel Nozzles And Fuel Nozzle Adapters Used.Four new tools are available to service the cylinder heads on the above 3406B Engines. The cylinder heads on these engines have been redesigned, with smaller diameter fuel injection nozzle adapters. These smaller adapters require the use of different tools to remove and install them.
Fuel Injection Nozzle Puller Tools For 3406B Engines
The new fuel injection nozzle adapter has a smaller inner diameter, for a longer length. To remove the fuel injection nozzle adapter use the new longer 8T3198 Tube and the new longer 8T3199 Screw, with the 6V6983 Adapter and 1B4206 Nut that were used with the former 3406 Engines (see Illustration 1).
Illustration 1. Nozzle puller tools for 3406B Engines.Fuel Injection Nozzle Adapter Tools For 3406B Engines
The new smaller diameter fuel injection nozzle adapter requires two new smaller wrenches to remove it from the cylinder head. The new 8T3139 Spanner Wrench (see Illustration 2) is used to remove and install the nozzle retainer. The new 8T3201 Wrench (see Illustration 3) is used to remove and install the fuel injection nozzle adapter.
The 8T3201 Wrench is available in two different designs (see Illustration 3). Both designs function the same.
Illustration 2. 8T3139 Spanner Wrench for removal and installation of nozzle retainers.
Illustration 3. 8T3201 Wrenches for removal and installation of nozzle adapters.