anyone help my lucas cav pump has a leak engine 2.5 na series 3 it appears to be coming from the top of the pump i can see there are what look like 4 screws holding a cover down which has on top the throttle linkage on top of it im reluctant to remove said screws in case all hell escapes springs and the like wondered if there is a gasket under cover tried tightening screws only one that cant be got hiding under part of throttle body might be wise to book her in proper job done any clues thanks