ENGINE OIL LEAK INSPECTION
Begin with a thorough visual inspection of the engine, particularly at the area of the suspected leak. If an oil
leak source is not readily identifiable, the following steps should be followed:
1. Do not clean or degrease the engine at this time because some solvents may cause rubber to swell,
temporarily stopping the leak.
2. Add an oil soluble dye (use as recommended by manufacturer). Start the engine and let idle for
approximately 15 minutes. Check the oil level indicator to make sure the dye is thoroughly mixed as
indicated with a bright yellow color under a black light.
3. Using a black light, inspect the entire engine for fluorescent dye, particularly at the suspected area of oil
leak. If the oil leak is found and identified, repair as necessary.
4. If dye is not observed, drive the vehicle at various speeds for approximately 24 km (15 miles), and repeat
inspection.
5.
If the oil leak source is not positively identified at this time
, proceed with the AIR LEAK
DETECTION TEST METHOD as follows:
Disconnect the fresh air hose (make-up air) at the cylinder head cover and plug or cap the outlet on
the cover.
Remove the PCV valve hose from the cylinder head cover. Cap or plug the PCV valve outlet on the
cover.
Attach an air hose with pressure gauge and regulator to the oil level indicator tube.
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 provides the best bubbles
which will pinpoint the leak source. If the oil leak is detected and identified, repair per service
information procedures.
If the leakage occurs at the crankshaft rear oil seal area, refer to
INSPECTION FOR REAR
SEAL AREA LEAKS
.
6. If no leaks are detected, turn off the air supply. Remove the air hose, all plugs, and caps. Install the PCV
valve and fresh air hose (make-up air). Proceed to next step.
7. 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.
assembly.
6. Valve stem seal(s) worn or
damaged.
6. Replace seal(s).
CAUTION: Do not subject the engine assembly to more than 20.6 kPa (3
PSI) of test pressure.
NOTE:
If oil leakage is observed at the oil level indicator tube to block location;
remove the tube, clean and reseal using Mopar® Stud AND Bearing Mount
(press fit tube applications only), and for O-ring style tubes, remove tube
and replace the O-ring seal.
2010 Jeep Wrangler Sport
2010 ENGINE 3.8L - Service Information - Wrangler
viernes, 1 de octubre de 2021 05:18:29 p. m.
Page 6
© 2011 Mitchell Repair Information Company, LLC.
