FUEL SYSTEMTESTING AND ADJUSTINGTM 5-3805-263-14&P-2temperature at an exhaust manifold port is an indica-tion of no fuel to the cylinder. This can possibly be anindication of a nozzle with a defect. Extra high tem-perature at an exhaust manifold port can be an indi-cation of too much fuel to the cylinder, alsocaused bya nozzle with a defect.The most common defects found with the fuelinjection nozzles are:1. Carbon on tip of the nozzle or in the nozzleorifice.2. Orifice wear.CAUTIONDo not teat nozzles unless you have the correctservice tools.TESTING 8N7005 FUELINJECTION NOZZLES1-38CAUTIONBe sure to use clean SAE J967 Calibration oilwhen tests are made. Dirty test oil will damagecomponents of fuel injection nozzles. The term-perature of the test oil must be 18 to 24°C (88 to75°F) for good test results.The 8N7005 Fuel Injection Nozzle can not bedisassembled for cleaning or adjustment. Do the teststhat follow to determine if the nozzle performance isacceptable.1. Valve Opening Pressure Test.II. Flush the Nozzle.III. Tip Leakage Test.IV. Orifice Restriction Test.V. Bleedscrew Leakage Test.Nozzle Preparation for TestBefore fuel injection nozzle (1) can be tested, allloose carbon around the tip of the nozzle must beremoved with the 8S2258 Brass Wire Brush (M).
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