|
|
|
Calibrate the tester according to the manufactur- er’s instructions. The shop air source for testing Perform the test procedures on each cylinder according to the tester manufacturer’s instructions. All gauge pressure indications should be equal, with no more than 25% leakage per cylinder. FOR EXAMPLE: At 552 kPa (80 psi) input pres- sure, a minimum of 414 kPa (60 psi) should be main- ENGINE OIL LEAK INSPECTION Begin with a thorough visual inspection of the engine, particularly at the area of the suspected leak. (1) Do not clean or degrease the engine at this time because some solvents may cause rubber to (2) Add an oil soluble dye (use as recommended by manufacturer). Start the engine and let idle for (3) Using a black light, inspect the entire engine for fluorescent dye, particularly at the suspected area (4) If dye is not observed, drive the vehicle at var- ious speeds for approximately 24 km (15 miles), and (5) If the oil leak source is not positively identified at this time, proceed with the air leak • Disconnect the fresh air hose (make-up air) at the cylinder head cover and plug or cap the nipple on • Remove the PCV valve hose from the cylinder head cover. Cap or plug the PCV valve nipple on the • Attach an air hose with pressure gauge and reg- ulator to the dipstick tube. CAUTION: Do not subject the engine assembly to • Gradually apply air pressure from 1 psi to 2.5 psi maximum while applying soapy water at the sus- detected and identified, repair per service manual • If the leakage occurs at the crankshaft rear oil seal area, refer to the section, Inspection for Rear (6) If no leaks are detected, turn off the air supply. Remove the air hose, all plugs, and caps. Install the (7) Clean the oil off the suspect oil leak area using a suitable solvent. Drive the vehicle at various NOTE: If oil leakage is observed at the dipstick tube T Stud & Bearing Mount (press fit tube applications only), and for O-ring style tubes, INSPECTION FOR REAR SEAL AREA LEAKS Since it is sometimes difficult to determine the source of an oil leak in the rear seal area of the If the leakage occurs at the crankshaft rear oil seal area: (1) Disconnect the battery. cover and inspect rear of block for evidence of oil. (a) Circular spray pattern generally indicates seal leakage or crankshaft damage. (b) Where leakage tends to run straight down, possible causes are a porous block, oil gallery cup case as previously described. CAUTION: Do not exceed 20.6 kPa (3 psi). (5) If the leak is not detected, very slowly turn the crankshaft and watch for leakage. If a leak is CS ENGINE 3.5L 9 - 11 ENGINE 3.5L (Continued) |