Note: Regular valve clearance adjustment is only performed on Mirage 1.5L 1990–1995 and 1.8L 1993–1995 models.
Attention! Violation of valve clearance adjustment increases the noise level produced by the valve mechanism and disrupts the stability of engine speed. Checking and adjusting valve clearances must be performed with the engine warmed up to normal operating temperature!
1. Warm up the engine to normal operating temperature, turn it off and disconnect the negative battery cable.
Warning! If the car stereo system is equipped with a security code, make sure you have the correct combination to activate the audio system before disconnecting the battery!
2. To make it easier to turn the engine by hand, remove the spark plugs.
3. Remove the cylinder head cover.
4. Turn the crankshaft clockwise until the alignment mark on the pulley aligns with the T mark on the lower timing belt cover - the pistons of the 1st and 4th cylinders should be in the TDC positions. Move the rocker arms of the valve drive of the 1st and 4th cylinders up and down to determine which piston of the cylinders occupies the TDC position of the end of the compression stroke (both rocker arms will move freely).
The article was taken from the website MitsubishiMan.ru
5. Using a blade-type feeler gauge, measure the valve clearances. At the TDC position of the end of the compression stroke of the piston of the 1st cylinder, measure the clearances of the intake and exhaust valves of the 1st and 2nd cylinders. Then turn the crankshaft one full revolution clockwise to bring the piston of the 4th cylinder to the TDC position of the end of the compression stroke and measure the clearances of the intake and exhaust valves of the 3rd and 4th cylinders.
6. Compare the measurement results with the requirements of the Specifications. If necessary, loosen the rocker arm lock nut of the corresponding valve drive and set its clearance using the adjusting screw. Having achieved the required result, tighten the lock nut with the required force (12÷15 N·m for 1.5 l models / 9 N·m for 1.8 l models), - make sure that the position of the screw does not change during tightening the nut.
7. Replace the cylinder head cover, screw in the spark plugs and connect the negative cable to the battery.