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D - ADJUSTMENTS 1991 Mitsubishi Montero 1991 ENGINE PERFORMANCE On-Vehicle Adjustments Chrysler Motors: Colt, Colt 200, Colt Vista, Ram-50, Stealth, Summit Mitsubishi: Eclipse, Galant, Mirage, Montero, Pickup, 3000GT ENGINE MECHANICAL Before performing any on-vehicle adjustments to fuel or ignition system, ensure engine mechanical condition is okay. VALVE CLEARANCE NOTE: All engines except 1.5L use hydraulic valve lifters. Valve adjustment is only required on 1.5L engines. To check hydraulic valve lifter operation, see CHECKING HYDRAULIC VALVE LIFTERS. MECHANICAL VALVE LIFTERS CAUTION: DO NOT rotate crankshaft in opposite direction of normal engine rotation. 1.5L 1) Ensure engine is at normal operating temperature. Remove all spark plugs and valve cover. Rotate crankshaft to position cylinder No. 1 on TDC of compression stroke. Adjust intake valves on cylinders No. 1 and No. 2, and exhaust valves on cylinders No. 1 and No. 3. See VALVE CLEARANCE ADJUSTMENT table for specification. 2) Rotate crankshaft 360 degrees to position cylinder No. 4 on TDC of compression stroke. Adjust intake valves on cylinders No. 3 and No. 4, and exhaust valves on cylinders No. 2 and No. 4. VALVE CLEARANCE ADJUSTMENT TABLE Cold Hot Application In. (mm) In. (mm) Intake ............ .003 (.07) ......... .006 (.15) Exhaust ........... .007 (.17) ......... .010 (.25) CHECKING HYDRAULIC VALVE LIFTERS Except 1.5L 1) Remove valve cover. Push downward on end of rocker arm above lash adjuster. If lash adjuster is normal, it will feel hard. If lash adjuster moves downward easily when pushed, replace adjuster. 2) If lash adjuster feels soft or spongy, oil with air has probably entered lash adjuster. If this occurs, check engine oil level. If engine oil level is okay, check oil screen and oil screen gasket for damage. 3) After repairing cause of air leak, warm engine to operating temperature. Drive vehicle at low speed for approximately 5 minutes. Turn engine off for a few minutes. 4) Restart engine and drive at low speed for approximately 5 |