Cam shaft oil seal: A round metal washer, covered with rubber, that fits tightly around the cam shaft end. It is used to keep the oil on inside of the engine from becoming the gunk burning on the exhaust pipe. O-ring: A thin rubber ring that seals the port cam shaft housing to the front of the engine head. Note:
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P is for Positive and N is for Negative So basically put a PNP Transistor Would use N to Switch P, in the name PNP or NPN the first character is for the polarity of â¦ the Collector-pin, the second for the Base-Pin, and the third for the Emmiter-pin.-p-n transistor is made by sandwiching thin layer of p-type semiconductor between two layers of n-type semiconductor. It has three terminals, Emitter, Base and collector. The â¦ npn transistor has two supplies, one is connected through the emitter base and one through the collector base.