HEAD 6E4940 - Caterpillar

All 3114, 3116 and 3126 Mechanical Unit Injection (MUI) or 3116 and 3126 Hydraulic Electronic Unit Injection (HEUI) "
2-Valve"
Marine, Industrial, and Generator Set EnginesA new injector seating tool group and injector seating procedure is now available to provide improved seating of injectors in the cylinder head brass sleeves. The improved seating provides a better metal to metal seal against combustion gas leakage into the fuel. The improved seating tools and procedure eliminate the need to ream new sleeves after installation. Used sleeves do not need to be reamed unless the seat area is pitted, eroded, or has excessive carbon deposits. The new 173-1530 Injector Seating Tool Group includes the NEHS0738 Tool Operating Manual that contains injector seating procedures for both Mechanical Unit Injection (MUI) and Hydraulic Electronic Unit Injection (HEUI) "2-Valve" Engines. There is also an instructional video tape available that shows how to perform the injection seating procedures using the new 173-1530 Injector Seating Tool Group. The media number for the video tape is LEVN4732. The video tape is available through normal Caterpillar literature ordering channels. The new 173-1530 Injector Seating Tool Group and procedures are adaptable to all 3114, 3116, and 3126 Engines.
The new 173-1530 Injector Seating Tool Group is not for use on 3126B Engines. 3126B Engines have a "3-Valve" cylinder head and use a different type of cylinder head sleeve. Please make reference to the new 173-1530 Injector Seating Tool Group in Service Manual Module SENR3611-05; Basic Engine Components, 3114, 3116 and 3126 Engines, Disassembly and Assembly, Page 41. (SENR3611-05 is currently being revised to include information about this new tool group.)