GASKET 1708446 - Caterpillar

The fuel injection nozzles can be permanently damaged by twisting if only one wrench is used to loosen or tighten the fuel line nuts.Use one wrench to hold the nozzle and another to loosen the nut.
Loosen the fuel line nuts on the fuel injection nozzle by 1/2 turn.
Move the governor lever to the LOW IDLE position.
Crank the engine with the starting motor until fuel without air flows from the fuel line connections.
Tighten the fuel line nuts.Note: The fuel priming pump will not provide enough pressure for pushing fuel through the reverse flow check valves in the fuel injection pumps.Checking Engine Cylinders Separately
If any of the following conditions occur, check the individual engine cylinders:
The engine runs rough.
The engine misfires.
The exhaust system blows out black smoke.Use this procedure to check the engine cylinders separately:
Run the engine at a speed that gives the maximum misfiring or rough running.
The fuel injection nozzles can be permanently damaged by twisting if only one wrench is used to loosen or tighten the fuel line nuts.Use one wrench to hold the nozzle and another to loosen the nut.
Then, loosen a fuel line nut on the fuel injector nozzle for each cylinder one at a time. This will stop the flow of fuel to that engine cylinder.When a fuel line nut is loosened, the misfiring or rough running should increase.
Tighten the fuel line nut.
Repeat 1 through Step 3 with each engine cylinder in sequence until you discover a loosened fuel line that does NOT affect the engine's performance.
When you find the engine cylinder that does NOT affect the engine's performance, perform the following operations:
Test the fuel injection pump for that cylinder.
Test the fuel injector nozzle.When an engine runs at low idle speed, the temperature of an exhaust manifold can indicate the condition of a fuel injector nozzle. A low temperature indicates that no fuel is reaching the cylinder. This can possibly signify that the fuel injector nozzle has a defect.When an engine runs at low idle rpm and the temperature of an exhaust manifold is at an extra high temperature, too much fuel is probably flowing into the engine cylinder. This can also signify that the fuel injector nozzle has a defect.The most common defects on fuel injector nozzles include the following defects:
Plugging or blocking by carbon at the orifice of a fuel injector nozzle
Orifice wear due to abrasive particles in the fuel
Wear from a wire brush on the fuel injector nozzle's tipRefer to Special Instruction, SEHS8149 for the procedure for checking the temperatures in the exhaust manifold port.Fuel Injection Lines
Fuel from the Fuel Injection Pumps to the Fuel Injector Nozzles
Fuel from the fuel injection pumps flows to the fuel injector nozzle through fuel injection lines.When fuel injection lines are disconnected, always place caps on the end and plugs on the end. This will keep the dirt out of the fuel injection lines. When fuel injection lines are installed, ensure that all clamps and all dampers are returned to original positions.The nuts that connect a fuel injection