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3. Remove engine cover. 4. Disconnect coil electrical connectors and remove coils. 5. Remove all spark plugs from engine. As spark plugs are being removed, check electrodes for abnormal firing indicators fouled, hot, oily, etc. Record cylinder number of spark plug for future reference. 6. Disconnect injector electrical connectors. 7. Be sure throttle blade is fully open during the compression check. 8. Insert compression gauge adaptor Special Tool 8116 or the equivalent, into the #1 spark plug hole in cylinder head. Connect the 0–500 psi (Blue) pressure transducer (Special Tool CH7059) with cable adaptors to the T . For Special Tool identification, (Refer to 9 - ENGINE - SPECIAL TOOLS). 9. Crank engine until maximum pressure is reached on gauge. Record this pressure as #1 cylinder pressure. 10. Repeat the previous step for all remaining cylinders. 11. Compression should not be less than 689 kPa (100 psi) and not vary more than 25 percent from cylinder to cylinder. 12. If one or more cylinders have abnormally low compression pressures, repeat the compression test. 13. If the same cylinder or cylinders repeat an abnormally low reading on the second compression test, it could indicate the existence of a problem in the cylinder in question. The recommended compression pressures 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 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 dipstick to make sure the dye is thoroughly mixed as indicated with a bright yellow color 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 inspec- tion. 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 nipple on the cover. • Remove the PCV valve hose from the cylinder head cover. Cap or plug the PCV valve nipple on the cover. • 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. • Gradually apply air pressure from 1 psi to 2.5 psi maximum while applying soapy water at the suspected • If the leakage occurs at the crankshaft rear oil seal area, refer to the section, Inspection for Rear Seal Area 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 approx- imately 24 km (15 miles). Inspect the engine for signs of an oil leak by using a black light. PM ENGINE 2.0L WORLD 9 - 1551 |