BMW 11341251880 Intake Valve

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Inspect the valves for signs of pitting and burning especially in the case of the exhaust valves and examine the seatings. In some cases where pitting is shallow then it can be rectified by grinding of the valve seats together with the valves using the normal valve grinding paste, course and fine. Where there is severe pitting on the valve seats, the valves will have to be re-cut and fitted; where the seats are too poor to recut, new valve seat inserts should be fitted, if possible by the local BMW agent or engineering works. More often than not, it will be the valves that are worn out for replacement; these are usually bought new, then matched with the seats through a process known as valve grinding. In valve grinding, put just sufficient coarsely gritty carborundum paste on the seat face, and apply suction grinder's tool on the valve head, grinding it with half rotary movement and swiveling the valve upwards to distribute the paste. After both surfaces have lost their high gloss and are matt in appearance, remove the paste, apply fine carborundum paste and carry out the lifting and turning of the valve as before. This could be made easier by a light spring under the valve head. When the latter has a smooth, unbroken ring of light grey matt finish on both faces of the wheel, grinding is accomplished. , lastly, remove all forms of carbon from the valve head and from the stem, remove all grind compound from the valve and make sure there are no particles in the ports or valve guides. Remove the valves from the seats and polish with melted paraffin put on a piece of cloth and then a clean cloth and if accessible, compressed air to blow them.

After adjusting the valve gap, retighten the locknut without moving the eccentric cam.