Lift off the valve cover and turn the engine to the firing position for No. 1 cylinder, without changing the position of both cams pointing obliquely upwards, at equal angles, and both ignition mark of crankshaft pulley at 0deg. Always rotate the crankshaft with the center bolt. Using a feeler gauge measure the valve clearance (remember that a cold engine should have a clearance of 0.012 - 0.018 in (0.30 - 0.45 mm) and a warm engine clearance of 0.014 - 0.020 in (0.35 - 0.50 mm)). When adjusting, the clearance for cold engine should be 0.014 - 0.016 in (0.35 - 0.40 mm) and for a warm engine, 0.016 - 0.018 in (0.40 - 0.45 mm) and this is the same thing for inlet and exhaust valve. To adjust the clearance, position the slots at right angles to the camshaft by turning the tappets, positioning the Volvo tool 5022 as shown, and depressing the tappets to remove the adjuster washers. To accomplish this, replace the adjuster washer with one of the correct thickness to achieve the specified clearance, reading washer, available in different thicknesses from 0.130 to 0.180 in (3.30 to 4.50 mm) in increments of 0.002 in (0.05 mm), being sure that the marked face of the washer is facing downwards and oiling the washer before fitting as. Remove the tappet depressing tool and rotate engine to firing position for No. 3 cylinder and repeat process, then for No. 4 and No. 2 cylinders. If the Volvo tappet depressing tool is not available, depress the tappet by turning the engine until the cam depresses the tappet and using a wedge to hold the tappet in place while turning the camshaft to the checking position to lift out the washer. Finally, fit the half moon-shaped rubber seal in the rear part of the
Cylinder Head, fix the gasket to the cylinder head, oil the camshaft and fit the valve cover, fixing the ignition setting indicator to the valve cover using one of the nuts.