just got my tappets done and my timing chain tensioner fitted and guide 96 glx petrol gal. got it back sounded sweet next morning it was making a loud tapping sound the hydraulic timing chain tensioners top came off and smashed all my guides. got new one for three and a timing chain kit and tappets chucked in. changed it all including tappets. still a loud tapping sound could it be a bocked oil pump? not sending oil to tappets . cheers dewsy