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Home >> Buick >> 1994 >> Roadmaster Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 33 (Engine Controls - System/Component Tests - 6.5L Diesel) >> Fuel System >> Injectors >> Test Preparation

Test Preparation

WARNING: This page does not describe the selected car, but rather 20 other vehicles, including the 1994 GMC Yukon, 1994 GMC Vandura Special, 1994 GMC Vandura, 1994 GMC Suburban, and 1994 GMC Rally Camper Special. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove injector nozzles from engine. Clean carbon from tip area of nozzle with soft brass wire brush. DO NOT  use steel brush or motorized brush to clean nozzle tip. Damage to nozzle tip may result.
    CAUTION: Use Nozzle Socket (J-36142) to remove and replace injection nozzle. Attach socket to 30-mm hex portion of nozzle. Failure to do so will result in damage to injector nozzle.
  2. Connect injector nozzle to injection nozzle tester. Place clear plastic tubing on both fuel return fittings to prevent bleed-off from being confused with leaks. Close tester shutoff valve to pressure gauge.
  3. Fill tester with test fluid. Fill and flush nozzle assembly with test fluid by operating tester lever briskly and repeatedly. This purges air from injector nozzle and coats all parts with test fluid.
WARNING: When testing injectors, keep spray contained to avoid serious injury. DO NOT  allow injector to release line pressure on hands, arms or any part of body. Pressure of atomized test spray has sufficient penetrating power to puncture flesh.
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