The piston of the 1st cylinder is set to the top dead center (TDC) position of the compression stroke so that when carrying out work related to removing the timing chains, the valve timing is not disturbed.
If the valve timing is incorrect, the engine will not operate normally.
Remove oil filler plug 1.
Remove the 2 spark plug tips with the 3 high voltage wire seals and wires.
Disconnect hose 5 and tube 7 for crankcase ventilation from the fittings on cover 6 of the cylinder head.
Unscrew the eight bolts 4 and remove the cylinder head cover 6 with the cover gasket.
Unscrew the four bolts 1 and remove the front cover 2 of the cylinder head, being careful not to damage the gasket.
Unscrew bolts 3 and remove plastic chain guide 4.
Set the piston of the 1st cylinder to the top dead center (TDC) of the compression stroke.
To do this, turn the crankshaft by ratchet 1 so that mark 2 on the crankshaft pulley coincides with protrusion 3 on the cover.
In this case, marks 1 on the camshaft sprockets should be located horizontally at the level of the upper plane of the cylinder head and directed in opposite directions.
After installing the piston of the 1st cylinder in the i.m.t. Do not turn the camshafts, crankshaft and intermediate shaft.
If the marks on the crankshaft gears and on the camshaft gears do not match, it means that the valve timing is incorrect (the piston of the first cylinder is not installed at TDC).