Abstract: A timing-chain cover cap for a timing-chain cover comprising a generally semi elliptical cap body, the upper portion thereof being in circular shape while the lower portion thereof being in arcuate shape, and the bottom of the cap body is encircled by an integerally formed locating plate member except that part beneath the arcuate portion. By means of a plurality of holes provided on said locating plate member, the cap body can be threadingly fitted onto the timing-chain cover.