The importance of having the valveclearances correctly adjusted cannot beoverstressed, as they vitally affect theperformance of the engine. If the clearancesare too big, the engine will be noisy(characteristic rattling or tapping noises) andengine efficiency will be reduced, as thevalves open too late and close too early. Amore serious problem arises if the clearancesare too small, however. If this is the case, thevalves may not close fully when the engine ishot, resulting in serious damage to the engine(eg. burnt valve seats and/or cylinder headwarping/cracking). The clearances arechecked and adjusted as follows.
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