Pressure Method

NOTE: Due to their remote location, rear engine oil leaks may be very difficult to pinpoint. This area is also very difficult to clean. Make sure to eliminate all other possibilities before removing an engine or transmission to repair a suspected leak in this area.

When diagnosing engine oil leaks, it is important that the source and location of the leak be positively identified prior to service.

As an alternative testing procedure, the crankcase can be pressurized, not to exceed 21 kPa (3 psi) to locate oil leaks. The following materials are required to fabricate the tool to be used:
1. Air supply and air hose.
2. Air pressure gauge that registers pressure in increments of one psi.
3. Air line shutoff valve.
4. Appropriate fittings to attach above parts to oil fill, PCV grommets and PCV fresh air hose tube.
5. Appropriate plugs to seal any openings leading to crankcase.
6. 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 shutoff valve and the appropriate adapter to permit the air to enter the engine through the valve 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 21 kPa (3 psi).

CAUTION: Use extreme caution when pressurizing crankcase. Applying air pressure above specified pressure risks damage to seals, gaskets and core plugs. Under no circumstances should pressure be allowed to exceed 21 kPa (3 psi).

2. Inspect sealed and/or gasketed areas for leaks by applying a solution of liquid detergent and water over areas for formation of bubbles, which indicates leakage.