Section 03-00: Engine—Service
1993 Mustang Workshop Manual
DIAGNOSIS AND TESTING

Pressure Method

 

Alternative Testing Procedure

The crankcase can be pressurized to locate oil leaks. The following materials are required to fabricate the tool to be used.

  1. Air supply and air hose.
  1. Air pressure gauge that registers pressure in one psi increments.
  1. Air line shut-off valve.
  1. Appropriate fittings to attach above parts to oil fill, PCV grommet holes and rocker arm cover tube.
  1. Appropriate plugs to seal any openings leading to crankcase.
  1. A solution of liquid detergent and water to be applied with a suitable type applicator such as a squirt bottle or brush.

    Fabricate the air supply hose to include the air line shut-off valve and the appropriate adapter to permit the air to enter the engine through the rocker arm cover tube. Fabricate the air pressure gauge to a suitable adapter for installation on the engine at the oil fill opening.

 

Testing Procedure

  1. Open air supply valve until pressure gauge maintains 34 kPa (5 psi).
  1. Inspect sealed and/or gasketed areas for leaks by performing "Snoop Pressure Check" or applying a solution of liquid detergent and water over areas for formation of bubbles, which indicates leakage.