ELBOW EXHAUST 2P5456 - Caterpillar

Introduction
In 1996, the EPA Emission Regulations began requiring engines to be equipped with some type of tamper resistant device. All 3116 Engines that have mechanical unit injection will be equipped with tamper resistant plugs in the governor housing. The tamper resistant plug will prevent unauthorized changes to the FRC.Tamper Resistant Plugs
The 3116 Engines have two sizes of tamper resistant plugs that are being used. Figure 1 shows the typical location of a 128-4786 Plug that has 7/8 inch threads. Figure 2 shows the typical location of a 128-4794 Plug that has 1 5/8 inch threads.If an adjustment is required on a 3116 Engine that is equipped with a tamper resistant plug, a 131-5009 Wrench is required to remove the plug.
Illustration 1 g00617938
(1) Typical location of 128-4786 Plug
Illustration 2 g00617940
(2) Typical location of 128-4794 Plug