SEAL-O-RING 2974854 - Caterpillar

Introduction
For Specifications with illustrations, make reference to Specifications For 3114 & 3116 Engines, Form No. SENR6436. If the Specifications in Form SENR6436 are not the same as in the Systems Operation and Testing And Adjusting, look at the printing date on the back cover of each book. Use the Specifications given in the book with the latest date.Fuel System
Either too much fuel or not enough fuel for combustion can be the cause of a problem in the fuel system.Many times work is done on the fuel system when the problem is really with some other part of the engine. The source of the problem is difficult to find, especially when smoke comes from the exhaust. Smoke that comes from the exhaust can be caused by a bad fuel injector, but it can also be caused by one or more of the reasons that follow:* Not enough air for good combustion.* An overload at high altitude.* Oil leakage into combustion chamber.* Not enough compression.Fuel System Inspection
A problem with the components that send fuel to the engine can cause low fuel pressure. This can decrease engine performance.Fuel System
Fuel System
(1) Tube assembly (return to tank from fuel passage in cylinder head). (2) Fuel outlet port (to tank). (3) Tube assembly (from transfer pump to fuel filter base). (4) Tube assembly (from fuel filter base to fuel passage in cylinder head). (5) Fuel inlet port (to fuel transfer pump). (6) Screen. (7) Fuel filter.1. Check the fuel level in the fuel tank. Look at the cap for the fuel tank to make sure the vent is not filled with dirt.2. Check the fuel lines for fuel leakage. Be sure the fuel supply line does not have a restriction or a bad bend.3. Install a new secondary fuel filter. Clean screen (6) located in the inlet fitting of the fuel transfer pump.4. Inspect the orifice in tube assembly (1) to see that there is no restriction for proper operation.Checking Engine Cylinders Separately
Temperature of an exhaust manifold port, when the engine runs at low idle speed, can be an indication of the condition of a fuel injector. Low temperature at an exhaust manifold port is an indication of no fuel to the cylinder. This can possibly be an indication of an inoperative injector. Extra high temperature at an exhaust manifold port can be an indication of too much fuel to the cylinder, caused by a malfunctioning injector. The difference between cylinders should be no more than 70°C (158°F).With the valve cover removed and the engine idling, the control shaft levers allow each injector to be actuated individually to the "FUEL ON" position for a few seconds. This causes excess fuel to be injected into that particular cylinder, causing a loud combustion "knock". If actuating an injector in this fashion briefly does not result in a loud combustion "knock", there may be a problem with the injector, the fuel supply to the injector, or the seal between the injector and the brass sleeve.Use the 1U8865