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Home >> Jeep >> 2007 >> Commander Base, 4.7 P, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (5.7L Engine (Service Information)) >> Lubrication >> Diagnosis And Testing >> Engine Oil Leak >> Air Leak Detection Test Method

Air Leak Detection Test Method

WARNING: This page is about a different variant/trim than selected.
  1. Remove the PCV valve from the IAFM. Cap or plug the PCV valve grommet.
  2. Attach an air hose with pressure gauge and regulator to the dipstick tube.
    CAUTION: Do not subject the engine assembly to more than 20.6 kPa (3 PSI) of test pressure.
  3. Gradually apply air pressure from 1 psi to 2.5 psi maximum while applying soapy water at the suspected source. Adjust the regulator to the suitable test pressure that provide the best bubbles which will pinpoint the leak source. If the oil leak is detected and identified, repair per service information procedures.
  4. If the leakage occurs at the rear oil seal area, refer to INSPECTION FOR REAR SEAL AREA LEAKS .
  5. If no leaks are detected, turn off the air supply and remove the air hose and all plugs and caps. Install the PCV valve.
  6. Clean the oil off the suspect oil leak area using a suitable solvent. Drive the vehicle at various speeds approximately 24 km (15 miles). Inspect the engine for signs of an oil leak by using a black light.
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